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2019-02-27 | Necessary and Sufficient Conditions for Passivity of Velocity-Sourced Impedance Control of Series Elastic Actuators | Series Elastic Actuation (SEA) has become prevalent in applications involving
physical human-robot interaction as it provides considerable advantages over
traditional stiff actuators in terms of stability robustness and fidelity of
force control. Several impedance control architectures have been proposed for
SEA. Among... | 1902.10607v2 |
2019-03-01 | Response to: [Comment on Quantization of the damped harmonic oscillator [Serhan et al, J. Math. Phys. 59, 082105 (2018)]] | This is a response to a recently reported comment [1] on paper [J. Math.
Phys.59, 082105 (2018)] regarding the quantization of damped harmonic
oscillator using a non-Hermitian Hamiltonian with real energy eigenvalues. We
assert here that the calculation of Eq. (29) of [2] is incorrect, and thus the
subsequent steps via... | 1903.00352v2 |
2019-03-08 | Protecting quantum correlations in presence of generalised amplitude damping channel: the two-qubit case | Any kind of quantum resource useful in different information processing tasks
is vulnerable to several types of environmental noise. Here we study the
behaviour of quantum correlations such as entanglement and steering in
two-qubit systems under the application of the generalised amplitude damping
channel and propose s... | 1903.03550v2 |
2019-03-17 | Generalized Euler, Smoluchowski and Schrödinger equations admitting self-similar solutions with a Tsallis invariant profile | The damped isothermal Euler equations, the Smoluchowski equation and the
damped logarithmic Schr\"odinger equation with a harmonic potential admit
stationary and self-similar solutions with a Gaussian profile. They satisfy an
$H$-theorem for a free energy functional involving the von Weizs\"acker
functional and the Bol... | 1903.07111v1 |
2019-03-21 | Creating localized plasma wave by ionization of doped semiconductors | Localized plasma waves can be generated by suddenly ionizing extrinsic
semiconductors with spatially periodic dopant densities. The built-in
electrostatic potentials at the metallurgical junctions, combined with electron
density ripples, offer the exact initial condition for exciting long-lasting
plasma waves upon ioni... | 1903.09013v2 |
2019-03-22 | Noncommutative approach to diagnose degenerate Higgs bosons at 125 GeV | We propose a noncommutative (NC) version for a global O(2) scalar field
theory, whose damping feature is introduced into the scalar field theory
through the NC parameter. In this context, we investigate how noncommutative
drives spontaneous symmetry breaking (SSB) and Higgs-Kibble mechanisms and how
the damping feature... | 1903.09727v2 |
2019-03-30 | Uncertainty damping in kinetic traffic models by driver-assist controls | In this paper, we propose a kinetic model of traffic flow with uncertain
binary interactions, which explains the scattering of the fundamental diagram
in terms of the macroscopic variability of aggregate quantities, such as the
mean speed and the flux of the vehicles, produced by the microscopic
uncertainty. Moreover, ... | 1904.00257v2 |
2019-04-01 | Reduction of Kinetic Equations to Liénard-Levinson-Smith Form: Counting Limit Cycles | We have presented an unified scheme to express a class of system of equations
in two variables into a Li\'enard-Levinson-Smith (LLS) oscillator form. We have
derived the condition for limit cycle with special reference to Rayleigh and
Li\'enard systems for arbitrary polynomial functions of damping and restoring
force. ... | 1904.00604v2 |
2019-04-02 | Stability of the interface of an isotropic active fluid | We study the linear stability of an isotropic active fluid in three different
geometries: a film of active fluid on a rigid substrate, a cylindrical thread
of fluid, and a spherical fluid droplet. The active fluid is modeled by the
hydrodynamic theory of an active nematic liquid crystal in the isotropic phase.
In each ... | 1904.01558v1 |
2019-04-04 | Shear viscosity of classical fields in scalar theory | We investigate the shear viscosity of massless classical scalar fields in the
$\phi^4$ theory on a lattice by using the Green-Kubo formula. Based on the
scaling property of the classical field, the shear viscosity is represented
using a scaling function. Equilibrium expectation value of the time-correlation
function of... | 1904.02419v3 |
2019-04-08 | Study of Decoherence in Quantum Computers: A Circuit-Design Perspective | Decoherence of quantum states is a major hurdle towards scalable and reliable
quantum computing. Lower decoherence (i.e., higher fidelity) can alleviate the
error correction overhead and obviate the need for energy-intensive noise
reduction techniques e.g., cryogenic cooling. In this paper, we performed a
noise-induced... | 1904.04323v1 |
2019-04-09 | Ferromagnetic Resonance Studies of Strain tuned Bi:YIG Films | Bismuth-doped Yttrium iron garnet (Bi:YIG) thin films known for large
Magneto-optical activity with low losses still needs to get probed for its
magnetization dynamics. We demonstrate a controlled tuning of
magnetocrystalline anisotropy in Bi-doped Y_3 Fe_5 O_12 (Bi:YIG) films of high
crystalline quality using growth i... | 1904.04800v2 |
2019-04-23 | A novel undamped gapless plasmon mode in tilted type-II Dirac semimetal | We predict the existence of a novel long-lived gapless plasmon mode in a
type-II Dirac semimetal (DSM). This gapless mode arises from the out-of-phase
oscillations of the density fluctuations in the electron and the hole pockets
of a type-II DSM. It originates beyond a critical wave-vector along the
direction of the ti... | 1904.10137v1 |
2019-04-25 | Interplay between nonclassicality and $\mathcal{PT}$ symmetry in an effective two level system with open system effects | A three level atom in $\Lambda$ configuration is reduced to an effective two
level system, under appropriate conditions, and its $\mathcal{PT}$ symmetric
properties are investigated. This effective qubit system when subjected to a
beam-splitter type of interaction, it provides the scope of directly
(indirectly) probing... | 1904.11181v1 |
2019-04-25 | Low damping magnetic properties and perpendicular magnetic anisotropy with strong volume contribution in the Heusler alloy Fe1.5CoGe | We present a study of the dynamic magnetic properties of TiN-buffered
epitaxial thin films of the Heusler alloy Fe$_{1.5}$CoGe. Thickness series
annealed at different temperatures are prepared and the magnetic damping is
measured, a lowest value of $\alpha=2.18\times 10^{-3}$ is obtained. The
perpendicular magnetic ani... | 1904.11247v1 |
2019-04-26 | Terahertz spin dynamics driven by a field-derivative torque | Efficient manipulation of magnetization at ultrashort time scales is of
particular interest for future technology. Here, we numerically investigate the
influence of the so-called field-derivative torque, which was derived earlier
based on relativistic Dirac theory [Mondal et al., Phys. Rev. B 94, 144419
(2016)], on the... | 1904.11768v2 |
2019-04-30 | A Self-Adaptive Contractive Algorithm for Enhanced Dynamic Phasor Estimation | In this paper, a self-adaptive contractive (SAC) algorithm is proposed for
enhanced dynamic phasor estimation in the diverse operating conditions of
modern power systems. At a high-level, the method is composed of three stages:
parameter shifting, filtering and parameter unshifting. The goal of the first
stage is to tr... | 1904.13328v1 |
2019-05-02 | The floatability of aerosols and waves damping on Titan's seas | Titan, Saturn's largest moon, has a dense atmosphere, together with lakes and
seas of liquid hydrocarbons. These liquid bodies, which are in polar regions
and up to several hundred kilometres in diameter, generally have smooth
surfaces despite evidence of near-surface winds. Photochemically generated
organic aerosols f... | 1905.00760v1 |
2019-05-02 | Holographic Plasmon Relaxation with and without Broken Translations | We study the dynamics and the relaxation of bulk plasmons in strongly coupled
and quantum critical systems using the holographic framework. We analyze the
dispersion relation of the plasmonic modes in detail for an illustrative class
of holographic bottom-up models. Comparing to a simple hydrodynamic formula, we
entang... | 1905.00804v2 |
2019-05-05 | Effective spin-mixing conductance of heavy-metal-ferromagnet interfaces | The effective spin-mixing conductance (G_eff) of a heavy metal/ferromagnet
(HM/FM) interface characterizes the efficiency of the interfacial spin
transport.Accurately determining G_eff is critical to the quantitative
understanding of measurements of direct and inverse spin Hall effects. G_eff is
typically ascertained f... | 1905.01577v2 |
2019-05-07 | Integral representation formulae for the solution of a wave equation with time-dependent damping and mass in the scale-invariant case | This paper is devoted to derive integral representation formulae for the
solution of an inhomogeneous linear wave equation with time-dependent damping
and mass terms, that are scale-invariant with respect to the so-called
hyperbolic scaling. Yagdjian's integral transform approach is employed for this
purpose. The main ... | 1905.02408v1 |
2019-05-07 | Optimal decay for the $n$-dimensional incompressible Oldroyd-B model without damping mechanism | By a new energy approach involved in the high frequencies and low frequencies
decomposition in the Besov spaces, we obtain the optimal decay for the
incompressible Oldroyd-B model without damping mechanism in $\mathbb{R}^n$
($n\ge 2$). More precisely, let $(u,\tau)$ be the global small solutions
constructed in [18],
... | 1905.02604v1 |
2019-05-12 | Transport and Phonon Damping in $^{\bf 4}$He | The dynamic structure function $S(k,\omega)$ informs about the dispersion and
damping of excitations. We have recently (Phys. Rev. B {\bf 97}, 184520 (2018))
compared experimental results for $S(k,\omega)$ from high-precision neutron
scattering experiment and theoretical results using the ``dynamic many-body
theory'' (... | 1905.04759v1 |
2019-05-15 | Nearly Markovian maps and entanglement-based bound on corresponding non-Markovianity | We identify a set of dynamical maps of open quantum system, and refer to them
as "$ \epsilon $-Markovian" maps. It is constituted of maps which, in a higher
dimensional system-environment Hilbert space, possibly violate Born
approximation but only a "little". We characterize the
"$\epsilon$-nonmarkovianity" of a genera... | 1905.06198v3 |
2019-05-15 | A remark on triviality for the two-dimensional stochastic nonlinear wave equation | We consider the two-dimensional stochastic damped nonlinear wave equation
(SdNLW) with the cubic nonlinearity, forced by a space-time white noise. In
particular, we investigate the limiting behavior of solutions to SdNLW with
regularized noises and establish triviality results in the spirit of the work
by Hairer, Ryser... | 1905.06278v3 |
2019-05-17 | Chiral p-wave superconductors have complex coherence and magnetic field penetration lengths | We show that in superconductors that break time reversal symmetry and have
anisotropy, such as p+ip materials, all order parameters and magnetic modes are
mixed. Excitation of the gap fields produces an excitation of the magnetic
field and vice versa. Correspondingly the long-range decay of the magnetic
field and order... | 1905.07296v2 |
2019-05-20 | Short time blow-up by negative mass term for semilinear wave equations with small data and scattering damping | In this paper we study blow-up and lifespan estimate for solutions to the
Cauchy problem with small data for semilinear wave equations with scattering
damping and negative mass term. We show that the negative mass term will play a
dominant role when the decay of its coefficients is not so fast, thus the
solutions will ... | 1905.08100v1 |
2019-05-21 | Low-pass-filter-based shock response spectrum and the evaluation method of transmissibility between equipment and sensitive components interfaces | According to the features of the sources of pyroshock and ballistic shock,
this study considers the pyroshock and ballistic shock generated by their
respective impulsive sources as damped harmonic waves with different
frequencies. According to the linear superposition assumption of damped
harmonic waves in a linear ela... | 1905.10190v1 |
2019-05-24 | Sound damping in glasses: interplay between anharmonicities and elastic heterogeneities | Some facets of the way sound waves travel through glasses are still unclear.
Recent works have shown that in the low-temperature harmonic limit a crucial
role in controlling sound damping is played by local elastic heterogeneity.
Sound waves propagation has been demonstrated to be strongly affected by
inhomogeneous mec... | 1905.10235v2 |
2019-05-27 | A blow-up result for a semilinear wave equation with scale-invariant damping and mass and nonlinearity of derivative type | In this note, we prove blow-up results for semilinear wave models with
damping and mass in the scale-invariant case and with nonlinear terms of
derivative type. We consider the single equation and the weakly coupled system.
In the first case we get a blow-up result for exponents below a certain shift
of the Glassey exp... | 1905.11025v2 |
2019-05-28 | Stationary states for underdamped anharmonic oscillators driven by Cauchy noise | Using methods of stochastic dynamics, we have studied stationary states in
the underdamped anharmonic stochastic oscillators driven by Cauchy noise. Shape
of stationary states depend both on the potential type and the damping. If the
damping is strong enough, for potential wells which in the overdamped regime
produce m... | 1905.12078v2 |
2019-05-30 | Intrinsically Undamped Plasmon Modes in Narrow Electron Bands | Surface plasmons in 2-dimensional electron systems with narrow Bloch bands
feature an interesting regime in which Landau damping (dissipation via
electron-hole pair excitation) is completely quenched. This surprising behavior
is made possible by strong coupling in narrow-band systems characterized by
large values of th... | 1905.13088v2 |
2019-06-04 | High frequency voltage-induced ferromagnetic resonance in magnetic tunnel junctions | Voltage-induced ferromagnetic resonance (V-FMR) in magnetic tunnel junctions
(MTJs) with a W buffer is investigated. Perpendicular magnetic anisotropy (PMA)
energy is controlled by both thickness of a CoFeB free layer deposited directly
on the W buffer and a post-annealing process at different temperatures. The PMA
ene... | 1906.01301v1 |
2019-06-04 | Late time approach to Hawking radiation: terms beyond leading order | Black hole evaporation is studied using wave packets for the modes. These
allow for approximate frequency and time resolution. The leading order late
time behavior gives the well known Hawking radiation that is independent of how
the black hole formed. The focus here is on the higher order terms and the rate
at which t... | 1906.01735v2 |
2019-06-20 | Time-sliced perturbation theory with primordial non-Gaussianity and effects of large bulk flows on inflationary oscillating features | We extend the formalism of time-sliced perturbation theory (TSPT) for
cosmological large-scale structure to include non-Gaussian initial conditions.
We show that in such a case the TSPT interaction vertices acquire new
contributions whose time-dependence factorizes for the Einstein-de Sitter
cosmology. The new formulat... | 1906.08697v2 |
2019-06-21 | Control of eigenfunctions on surfaces of variable curvature | We prove a microlocal lower bound on the mass of high energy eigenfunctions
of the Laplacian on compact surfaces of negative curvature, and more generally
on surfaces with Anosov geodesic flows. This implies controllability for the
Schr\"odinger equation by any nonempty open set, and shows that every
semiclassical meas... | 1906.08923v2 |
2019-06-21 | Exponential damping induced by random and realistic perturbations | Given a quantum many-body system and the expectation-value dynamics of some
operator, we study how this reference dynamics is altered due to a perturbation
of the system's Hamiltonian. Based on projection operator techniques, we unveil
that if the perturbation exhibits a random-matrix structure in the eigenbasis
of the... | 1906.09268v2 |
2019-06-27 | Fast control of dissipation in a superconducting resonator | We report on fast tunability of an electromagnetic environment coupled to a
superconducting coplanar waveguide resonator. Namely, we utilize a
recently-developed quantum-circuit refrigerator (QCR) to experimentally
demonstrate a dynamic tunability in the total damping rate of the resonator up
to almost two orders of ma... | 1906.11519v1 |
2019-06-28 | Ground-state cooling of an magnomechanical resonator induced by magnetic damping | Quantum manipulation of mechanical resonators has been widely applied in
fundamental physics and quantum information processing. Among them, cooling the
mechanical system to its quantum ground state is regarded as a key step. In
this work, we propose a scheme which one can realize ground-state cooling of
resonator in a... | 1906.12081v1 |
2019-06-30 | Non-linear spin torque, pumping and cooling in superconductor/ferromagnet systems | We study the effects of the coupling between magnetization dynamics and the
electronic degrees of freedom in a heterostructure of a metallic nanomagnet
with dynamic magnetization coupled with a superconductor containing a steady
spin-splitting field. We predict how this system exhibits a non-linear spin
torque, which c... | 1907.00424v2 |
2019-07-03 | Wave-ice interaction in the North-West Barents Sea | The results of field work on drift ice during wave propagation are analyzed
and presented. The field work was performed in the Barents Sea, and the main
focus of the paper is on wave processes in the MIZ. A model of wave damping in
broken ice is formulated and applied to interpret the field work results. It is
confirme... | 1907.02032v1 |
2019-07-05 | Nesterov's acceleration and Polyak's heavy ball method in continuous time: convergence rate analysis under geometric conditions and perturbations | In this article a family of second order ODEs associated to inertial gradient
descend is studied. These ODEs are widely used to build trajectories converging
to a minimizer $x^*$ of a function $F$, possibly convex. This family includes
the continuous version of the Nesterov inertial scheme and the continuous heavy
ball... | 1907.02710v1 |
2019-07-08 | Role of Toll-Like Receptors in the interplay between pathogen and damage associated molecular patterns | Various theoretical studies have been carried out to infer relevant
protein-protein interactions among pathogens and their hosts. Such studies are
generally based on preferential attachment of bacteria / virus to their human
receptor homologs. We have analyzed 17 pathogenic species mainly belonging to
bacterial and vir... | 1907.03512v1 |
2019-07-15 | Alternating Direction Method of Multipliers (ADMMs) Based Distributed Approach For Wide-Area Control | In this paper, an alternating direction method of multipliers based novel
distributed wide-area control architecture is proposed for damping the
interarea oscillations. In this approach, first, an interconnected power system
is divided into areas based on coherency grouping. Second, local processors are
assigned on eac... | 1907.06340v1 |
2019-07-16 | Coherency and Online Signal Selection Based Wide Area Control of Wind Integrated Power Grid | This paper introduces a novel method of designing wide area control (WAC)
based on a discrete linear quadratic regulator and Kalman filtering based
state-estimation that can be applied for real-time damping of interarea
oscillations of wind integrated power grid. The main advantages of the proposed
method are that the ... | 1907.06846v1 |
2019-07-20 | Magnon Bose-Einstein condensate and supercurrents over a wide temperature range | Magnon Bose-Einstein Condensates (BECs) and supercurrents are coherent
quantum phenomena, which appear on a macroscopic scale in parametrically
populated solid state spinsystems. One of the most fascinating and attractive
features of these processes is the possibility of magnon condensation and
supercurrent excitation ... | 1907.08805v1 |
2019-07-21 | Explaining Retrocausality Phenomena in Quantum Mechanics using a Modified Variational Principle | A modified lagrangian with causal and retrocausal momenta was used to derive
a first causal wave equation and a second retrocausal wave equation using the
principle of least action. The retrocausal wave function obtained through this
method was found to be equivalent to the complex conjugate of the causal wave
function... | 1907.09688v3 |
2019-07-23 | Global wellposedness to the $n$-dimensional compressible Oldroyd-B model without damping mechanism | The Cauchy problem of the compressible Oldroyd-B model without damping
mechanism in R^n$ with $n\ge2$ is considered. The lack of dissipation in
density and stress tensor in the model is compensated by exploiting an
intrinsic structure and introducing new quantities between density, velocity
and stress tensor. Therefore... | 1907.09829v3 |
2019-08-01 | The $J$-method for the Gross-Pitaevskii eigenvalue problem | This paper studies the $J$-method of [E. Jarlebring, S. Kvaal, W. Michiels.
SIAM J. Sci. Comput. 36-4:A1978-A2001, 2014] for nonlinear eigenvector problems
in a general Hilbert space framework. This is the basis for variational
discretization techniques and a mesh-independent numerical analysis. A simple
modification o... | 1908.00333v2 |
2019-08-02 | How do Conservative Backbone Curves Perturb into Forced Responses? A Melnikov Function Analysis | Weakly damped mechanical systems under small periodic forcing tend to exhibit
periodic response in a close vicinity of certain periodic orbits of their
conservative limit. Specifically, amplitude frequency plots for the
conservative limit have often been noted, both numerically and experimentally,
to serve as backbone ... | 1908.00721v3 |
2019-08-05 | Tunable strong coupling of two adjacent optical λ/2 Fabry-Pérot microresonators | Optical half-wave microresonators enable to control the optical mode density
around a quantum system and thus to modify the temporal emission properties. If
the coupling rate exceeds the damping rate, strong coupling between a
microresonator and a quantum system can be achieved, leading to a coherent
energy exchange an... | 1908.01566v1 |
2019-07-27 | An extension of the second order dynamical system that models Nesterov's convex gradient method | In this paper we deal with a general second order continuous dynamical system
associated to a convex minimization problem with a Fr\`echet differentiable
objective function. We show that inertial algorithms, such as Nesterov's
algorithm, can be obtained via the natural explicit discretization from our
dynamical system.... | 1908.02574v1 |
2019-08-07 | Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers | The thickness dependence of spin-orbit torque and magnetoresistance in
ferromagnet/heavy-metal bilayers is studied using the first-principles
non-equilibrium Green's function formalism combined with the Anderson disorder
model. A systematic expansion in orthogonal vector spherical harmonics is used
for the angular depe... | 1908.02680v2 |
2019-08-16 | Dynamics of Hot Bose-Einstein Condensates: stochastic Ehrenfest relations for number and energy damping | Describing partially-condensed Bose gases poses a long-standing theoretical
challenge. We present exact stochastic Ehrenfest relations for the stochastic
projected Gross-Pitaevskii equation, including both number and energy damping
mechanisms, and all projector terms that arise from the energy cutoff
separating system ... | 1908.05809v3 |
2019-08-12 | On a simple derivation of the very low damping escape rate for classical spins by modifying the method of Kramers | The original perturbative Kramers' method (starting from the phase space
coordinates) (Kramers, 1940) of determining the energy-controlled-diffusion
equation for Newtonian particles with separable and additive Hamiltonians is
generalized to yield the energy-controlled diffusion equation and thus the very
low damping (V... | 1908.06747v1 |
2019-08-22 | Improving the dynamics of quantum sensors with reinforcement learning | Recently proposed quantum-chaotic sensors achieve quantum enhancements in
measurement precision by applying nonlinear control pulses to the dynamics of
the quantum sensor while using classical initial states that are easy to
prepare. Here, we use the cross-entropy method of reinforcement learning to
optimize the streng... | 1908.08416v2 |
2019-08-28 | Spin functional renormalization group for quantum Heisenberg ferromagnets: Magnetization and magnon damping in two dimensions | We use the spin functional renormalization group recently developed by two of
us [J. Krieg and P. Kopietz, Phys. Rev. B $\bf{99}$, 060403(R) (2019)] to
calculate the magnetization $M ( H , T )$ and the damping of magnons due to
classical longitudinal fluctuations of quantum Heisenberg ferromagnets. In
order to guarante... | 1908.10753v2 |
2019-09-03 | Learning Elastic Constitutive Material and Damping Models | Commonly used linear and nonlinear constitutive material models in
deformation simulation contain many simplifications and only cover a tiny part
of possible material behavior. In this work we propose a framework for learning
customized models of deformable materials from example surface trajectories.
The key idea is t... | 1909.01875v2 |
2019-09-06 | Effect of Tantalum spacer thickness and deposition conditions on the properties of MgO/CoFeB/Ta/CoFeB/MgO free layers | To get stable perpendicularly magnetized tunnel junctions at small device
dimensions, composite free layers that comprise two MgO/FeCoB interfaces as
sources of interface anisotropy are generally used. Proper cristallisation and
annealing robustness is typically ensured by the insertion of a spacer layer of
the early t... | 1909.02741v1 |
2019-09-19 | Blow-up for Strauss type wave equation with damping and potential | We study a kind of nonlinear wave equations with damping and potential, whose
coefficients are both critical in the sense of the scaling and depend only on
the spatial variables. Based on the earlier works, one may think there are two
kinds of blow-up phenomenons when the exponent of the nonlinear term is small.
It als... | 1909.08885v3 |
2019-09-23 | Inference of modes for linear stochastic processes | For dynamical systems that can be modelled as asymptotically stable linear
systems forced by Gaussian noise, this paper develops methods to infer or
estimate their modes from observations in real time. The modes can be real or
complex. For a real mode, we wish to infer its damping rate and mode shape. For
a complex mod... | 1909.10247v2 |
2019-10-02 | Exponential stability for the nonlinear Schrödinger equation with locally distributed damping | In this paper, we study the defocusing nonlinear Schr\"{o}dinger equation
with a locally distributed damping on a smooth bounded domain as well as on the
whole space and on an exterior domain. We first construct approximate solutions
using the theory of monotone operators. We show that approximate solutions
decay expon... | 1910.00921v1 |
2019-10-07 | Quantum mechanics at high redshift -- Modelling Damped Lyman-$α$ absorption systems | For around 100 years, hydrogen spectral modelling has been based on Voigt
profile fitting. The semi-classical Voigt profile is based on a 2-level atom
approximation. Whilst the Voigt profile is excellent for many circumstances,
the accuracy is insufficient for very high column density damped Lyman-$\alpha$
absorption s... | 1910.02913v2 |
2019-10-12 | Almost Global Solutions to the Three-dimensional Isentropic Inviscid Flows with Damping in Physical Vacuum Around Barenlatt Solutions | For the three-dimensional vacuum free boundary problem with physical
singularity that the sound speed is $C^{ {1}/{2}}$-H$\ddot{\rm o}$lder
continuous across the vacuum boundary of the compressible Euler equations with
damping, without any symmetry assumptions, we prove the almost global existence
of smooth solutions w... | 1910.05516v1 |
2019-10-15 | Nonlocal quantum correlations under amplitude damping decoherence | Different nonlocal quantum correlations of entanglement, steering and Bell
nonlocality are defined with the help of local hidden state (LHS) and local
hidden variable (LHV) models. Considering their unique roles in quantum
information processing, it is of importance to understand the individual
nonlocal quantum correla... | 1910.06483v1 |
2019-10-17 | The linearly damped nonlinear Schrödinger equation with localized driving: spatiotemporal decay estimates and the emergence of extreme wave events | We prove spatiotemporal algebraically decaying estimates for the density of
the solutions of the linearly damped nonlinear Schr\"odinger equation with
localized driving, when supplemented with vanishing boundary conditions. Their
derivation is made via a scheme, which incorporates suitable weighted Sobolev
spaces and a... | 1910.08425v2 |
2019-10-24 | Gapless and gapped holographic phonons | We study a holographic model where translations are both spontaneously and
explicitly broken, leading to the presence of (pseudo)-phonons in the spectrum.
The weak explicit breaking is due to two independent mechanisms: a small source
for the condensate itself and additional linearly space-dependent marginal
operators.... | 1910.11330v2 |
2019-11-06 | High spin mixing conductance and spin interface transparency at $Co_2Fe_{0.4}Mn_{0.6}Si$ Heusler alloy and Pt interface | Ferromagnetic materials exhibiting low magnetic damping ($\alpha$) and
moderately high saturation magnetization are required from the viewpoints of
generation, transmission and detection of spin wave. Since spin-to-charge
conversion efficiency is another important parameter, high spin mixing
conductance ($g_{r}^{\uparr... | 1911.02230v1 |
2019-11-10 | Influence of resonances on the noise performance of SQUID susceptometers | Scanning Superconducting Quantum Interference Device (SQUID) Susceptometry
simultaneously images the local magnetic fields and susceptibilities above a
sample with sub-micron spatial resolution. Further development of this
technique requires a thorough understanding of the current, voltage, and flux
characteristics of ... | 1911.03836v2 |
2019-11-13 | Impact of the crystal orientation on spin-orbit torques in Fe/Pd bilayers | Spin-orbit torques in ferromagnetic (FM)/non-magnetic (NM) heterostructures
offer more energy-efficient means to realize spin-logic devices; however, their
strengths are determined by the heterostructure interface. This work examines
crystal orientation impact on the spin-orbit torque efficiency in different
Fe/Pd bila... | 1911.05487v1 |
2019-12-02 | Boundary input-to-state stabilization of a damped Euler-Bernoulli beam in the presence of a state-delay | This paper is concerned with the point torque boundary feedback stabilization
of a damped Euler-Bernoulli beam model in the presence of a time-varying
state-delay. First, a finite-dimensional truncated model is derived by spectral
reduction. Then, for a given stabilizing state-feedback of the delay-free
truncated model... | 1912.01117v1 |
2019-12-03 | The noise fluxes produced by the degree of first-order temporal coherence in a single mode class-A laser amplifier | The noise feature of a single mode class-A laser is investigated in the
presence (amplifier) and absence (free-running) of an input signal. The
Maxwell-Bloch equations of motion have been solved after adding the cavity
Langevin force to calculate fluctuations that imposed to the atomic population
inversion and the ampl... | 1912.01485v1 |
2019-12-05 | A Fast Implementation for the Canonical Polyadic Decomposition | A new implementation of the canonical polyadic decomposition (CPD) is
presented. It features lower computational complexity and memory usage than the
available state of art implementations available. The CPD of tensors is a
challenging problem which has been approached in several manners. Alternating
least squares algo... | 1912.02366v1 |
2019-12-05 | Damping of spinful excitons in LaCoO$_3$ by thermal fluctuations: Theory and experiment | We present Co $L_3$-edge resonant inelastic x-ray scattering (RIXS) of bulk
LaCoO$_3$ across the thermally-induced spin-state crossover around 100~K. Owing
to a high energy resolution of 25~meV, we observe unambiguously the dispersion
of the intermediate-spin (IS) excitations in the low temperature regime.
Approaching ... | 1912.02564v3 |
2019-12-09 | High Frequency Sound in a Unitary Fermi Gas | We present an experimental and theoretical study of the phonon mode in a
unitary Fermi gas. Using two-photon Bragg spectroscopy, we measure excitation
spectra at a momentum of approximately half the Fermi momentum, both above and
below the superfluid critical temperature $T_\mathrm{c}$. Below $T_\mathrm{c}$,
the domina... | 1912.03830v1 |
2019-12-10 | Stability of traveling waves in a driven Frenkel-Kontorova model | In this work we revisit a classical problem of traveling waves in a damped
Frenkel-Kontorova lattice driven by a constant external force. We compute these
solutions as fixed points of a nonlinear map and obtain the corresponding
kinetic relation between the driving force and the velocity of the wave for
different value... | 1912.05052v2 |
2019-12-11 | Quasinormal Modes of Charged Fields in Reissner-Nordstrom Backgrounds by Borel-Pade Summation of Bender-Wu Series | We extend recent work of Hatsuda on the computation of quasinormal mode
frequencies via analytic continuation of bound state energies and Borel-Pade
resummation of the Bender-Wu perturbation series to the case of charged fields
in the background of Reissner-Nordstrom black holes. We compare the quasinormal
mode frequen... | 1912.05553v2 |
2019-12-19 | On twin peak quasi-periodic oscillations resulting from the interaction between discoseismic modes and turbulence in accretion discs around black holes | Given the peculiar and (in spite of many efforts) unexplained quasi-periodic
oscillation (QPO) twin peak phenomena in accretion disc PSD observations, the
present exploratory analytical article tries to inquire deeper into the
relationship between discoseismic modes and the underlying driving turbulence
in order to ass... | 1912.09527v1 |
2019-12-28 | Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys | Galaxy surveys are an important probe for superimposed oscillations on the
primordial power spectrum of curvature perturbations, which are predicted in
several theoretical models of inflation and its alternatives. In order to
exploit the full cosmological information in galaxy surveys it is necessary to
study the matte... | 1912.12499v3 |
2020-01-04 | Finite Difference/Galerkin Finite Element Simulation of the Semi-Linear Wave Equation with Scale-Invariant Damping and Mass and Power Non-Linearity | This study is concern with the numerical solution of the initial boundary
value problem (IBVP) for the semilinear scale-invariant wave equation with
damping and mass and power non-linearity. Numerical results of the
aforementioned IBVP is obtained by using standart Galerkin finite element
method (GFEM) for the spatial ... | 2001.01075v2 |
2020-01-05 | Quantifying quantum non-Markovianity based on quantum coherence via skew information | Based on the nonincreasing property of quantum coherence via skew information
under incoherent completely positive and trace-preserving maps, we propose a
non-Markovianity measure for open quantum processes. As applications, by
applying the proposed measure to some typical noisy channels, we find that it
is equivalent ... | 2001.01261v1 |
2020-01-07 | von Neumann entropy and the entropy production of a damped harmonic oscillator | In this paper we analyze the entropy and entropy production of a non-isolated
quantum system described within the quantum Brownian motion framework. This is
a very general and paradigmatic framework for describing non-isolated quantum
systems and can be used in any kind of coupling regime. We start by considering
the a... | 2001.02261v1 |
2020-01-09 | Photon correlation measurements of stochastic limit cycles emerging from high-$Q$ nonlinear silicon photonic crystal microcavities | We performed measurements of photon correlation [$g^{(2)}(\tau)$] in driven
nonlinear high-$Q$ silicon (Si) photonic crystal (PhC) microcavities. The
measured $g^{(2)}(\tau)$ exhibits a damped oscillatory behavior when input pump
power exceeds a critical value. From comparison between experiments and
simulations, we at... | 2001.02838v2 |
2020-01-12 | Linear programming bounds for quantum amplitude damping codes | Given that approximate quantum error-correcting (AQEC) codes have a
potentially better performance than perfect quantum error correction codes, it
is pertinent to quantify their performance. While quantum weight enumerators
establish some of the best upper bounds on the minimum distance of quantum
error-correcting code... | 2001.03976v1 |
2020-01-22 | Small data blow-up for the wave equation with a time-dependent scale invariant damping and a cubic convolution for slowly decaying initial data | In the present paper, we study the Cauchy problem for the wave equation with
a time-dependent scale invariant damping, i.e.$\frac{2}{1+t}\partial_t v$ and a
cubic convolution $(|x|^{-\gamma}*v^2)v$ with $\gamma\in (0,n)$, where
$v=v(x,t)$ is an unknown function on $\mathbb{R}^n\times[0,T)$. Our aim of the
present paper... | 2001.07985v1 |
2020-01-22 | Testing a Quantum Error-Correcting Code on Various Platforms | Quantum error correction plays an important role in fault-tolerant quantum
information processing. It is usually difficult to experimentally realize
quantum error correction, as it requires multiple qubits and quantum gates with
high fidelity. Here we propose a simple quantum error-correcting code for the
detected ampl... | 2001.07998v1 |
2020-01-22 | Dynamic state reconstruction of quantum systems subject to pure decoherence | The article introduces efficient quantum state tomography schemes for qutrits
and entangled qubits subject to pure decoherence. We implement the dynamic
state reconstruction method for open systems sent through phase-damping
channels which was proposed in: Open Syst. Inf. Dyn. 23, 1650019 (2016). In the
current article... | 2001.08167v1 |
2020-01-28 | Rate of Estimation for the Stationary Distribution of Stochastic Damping Hamiltonian Systems with Continuous Observations | We study the problem of the non-parametric estimation for the density $\pi$
of the stationary distribution of a stochastic two-dimensional damping
Hamiltonian system $(Z_t)_{t\in[0,T]}=(X_t,Y_t)_{t \in [0,T]}$. From the
continuous observation of the sampling path on $[0,T]$, we study the rate of
estimation for $\pi(x_0... | 2001.10423v1 |
2020-01-28 | Image polaritons in boron nitride for extreme polariton confinement with low losses | Polaritons in two-dimensional materials provide extreme light confinement
that is difficult to achieve with metal plasmonics. However, such tight
confinement inevitably increases optical losses through various damping
channels. Here we demonstrate that hyperbolic phonon polaritons in hexagonal
boron nitride can overcom... | 2001.10583v2 |
2020-02-06 | Fractional derivative order determination from harmonic oscillator damping factor | This article analysis differential equations which represents damped and
fractional oscillators. First, it is shown that prior to using physical
quantities in fractional calculus, it is imperative that they are turned
dimensionless. Afterwards, approximated expressions that relate the two
equations parameters for the c... | 2002.02479v1 |
2020-02-11 | A numerical damped oscillator approach to constrained Schrödinger equations | This article explains and illustrates the use of a set of coupled dynamical
equations, second order in a fictitious time, which converges to solutions of
stationary Schr\"{o}dinger equations with additional constraints. We include
three qualitative different numerical examples: the radial Schr\"{o}dinger
equation for t... | 2002.04400v2 |
2020-02-12 | Fast computation of optimal damping parameters for linear vibrational systems | We formulate the quadratic eigenvalue problem underlying the mathematical
model of a linear vibrational system as an eigenvalue problem of a
diagonal-plus-low-rank matrix $A$. The eigenvector matrix of $A$ has a
Cauchy-like structure. Optimal viscosities are those for which $trace(X)$ is
minimal, where $X$ is the solut... | 2002.04917v2 |
2020-02-13 | Low-loss two-dimensional plasmon modes in antimonene | The effects of spin-orbit (SOC) and electron-phonon coupling on the
collective excitation of doped monolayer Sb$_2$ are investigated using density
functional and many-body perturbation theories. The spin-orbit coupling is
exclusively important for the monolayer Sb$_2$ and it leads to the
reconstruction of the electroni... | 2002.05302v1 |
2020-02-13 | Quantization of the damped harmonic oscillator based on a modified Bateman Lagrangian | An approach to quantization of the damped harmonic oscillator (DHO) is
developed on the basis of a modified Bateman Lagrangian (MBL); thereby some
quantum mechanical aspects of the DHO are clarified. We treat the energy
operator for the DHO, in addition to the Hamiltonian operator that is
determined from the MBL and co... | 2002.05435v1 |
2020-02-17 | Charge Transfer Through Redox Molecular Junctions in Non-Equilibrated Solvents | Molecular conduction operating in dielectric solvent environments are often
described using kinetic rates based on Marcus theory of electron transfer at a
molecule-metal electrode interface. However, the successive nature of charge
transfer in such system implies that the solvent does not necessarily reach
equilibrium ... | 2002.06932v1 |
2020-02-19 | Diagnostics of plasma ionisation using torsional Alfén waves | Using the recently observed torsional Alfv\'en waves in solar prominences, we
determine the ionisation state of the plasma by taking into account that
Alfv\'en waves propagate in a partially ionised prominence plasma. We derive
the evolutionary equation of waves and compare the analytical solutions to
observations to d... | 2002.08441v1 |
2020-03-01 | Optimal Oscillation Damping Control of cable-Suspended Aerial Manipulator with a Single IMU Sensor | This paper presents a design of oscillation damping control for the
cable-Suspended Aerial Manipulator (SAM). The SAM is modeled as a double
pendulum, and it can generate a body wrench as a control action. The main
challenge is the fact that there is only one onboard IMU sensor which does not
provide full information o... | 2003.00472v1 |
2020-03-06 | Accelerating the Convergence of Higher-Order Coupled Cluster Methods II: Coupled Cluster $Λ$ Equations and Dynamic Damping | The method of sub-iteration, which was previously applied to the higher-order
coupled cluster amplitude equations, is extended to the case of the coupled
cluster $\Lambda$ equations. The sub-iteration procedure for the $\Lambda$
equations is found to be highly similar to that for the amplitude equations,
and to exhibit... | 2003.03455v1 |
2020-03-09 | Forces between Silica Particles in Isopropanol Solutions of 1:1 Electrolytes | Interactions between silica surfaces across isopropanol solutions are
measured with colloidal probe technique based on atomic force microscope. In
particular, the influence of 1:1 electrolytes on the interactions between
silica particles is investigated. A plethora of different forces are found in
these systems. Namely... | 2003.04058v2 |
2020-03-13 | Energy localization and transfer in autoresonant weakly dissipative anharmonic chains | In this work, we develop an analytical framework to explain the influence of
dissipation and detuning parameters on the emergence and stability of
autoresonance in a strongly nonlinear weakly damped chain subjected to harmonic
forcing with a slowly-varying frequency. Using the asymptotic procedures, we
construct the ev... | 2003.06346v1 |
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