publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2014-11-22 | Quantification of the spin-Hall anti-damping torque with a resonance spectrometer | We present a simple technique using a cavity-based resonance spectrometer to
quantify the anti-damping torque due to the spin Hall effect. Modification of
ferromagnetic resonance is observed as a function of small DC current in
sub-mm-wide strips of bilayers, consisting of magnetically soft FeGaB and
strong spin-Hall m... | 1411.6166v1 |
2014-11-28 | Quantifying entanglement of a two-qubit system via measurable and invariant moments of its partially transposed density matrix | We describe a direct method to determine the negativity of an arbitrary
two-qubit state in experiments. The method is derived by analyzing the relation
between the purity, negativity, and a universal entanglement witness for
two-qubit entanglement. We show how the negativity of a two-qubit state can be
calculated from ... | 1411.7977v2 |
2014-12-05 | Adaptive Damping and Mean Removal for the Generalized Approximate Message Passing Algorithm | The generalized approximate message passing (GAMP) algorithm is an efficient
method of MAP or approximate-MMSE estimation of $x$ observed from a noisy
version of the transform coefficients $z = Ax$. In fact, for large zero-mean
i.i.d sub-Gaussian $A$, GAMP is characterized by a state evolution whose fixed
points, when ... | 1412.2005v1 |
2014-12-11 | Deviation From the Landau-Lifshitz-Gilbert equation in the Inertial regime of the Magnetization | We investigate in details the inertial dynamics of a uniform magnetization in
the ferromagnetic resonance (FMR) context. Analytical predictions and numerical
simulations of the complete equations within the Inertial
Landau-Lifshitz-Gilbert (ILLG) model are presented. In addition to the usual
precession resonance, the i... | 1412.3783v1 |
2014-12-14 | An adaptive selective frequency damping method | The selective frequency damping (SFD) method is an alternative to classical
Newton's method to obtain unstable steady-state solutions of dynamical systems.
However this method has two main limitations: it does not converge for
arbitrary control parameters; and when it does converge, the time necessary to
reach the stea... | 1412.4372v1 |
2014-12-23 | Photoacoustic elastic oscillation and characterization | Photoacoustic imaging and sensing have been studied extensively to probe the
optical absorption of biological tissue in multiple scales ranging from large
organs to small molecules. However, its elastic oscillation characterization is
rarely studied and has been an untapped area to be explored. In literature,
photoacou... | 1412.7284v1 |
2015-01-02 | Inertia, diffusion and dynamics of a driven skyrmion | Skyrmions recently discovered in chiral magnets are a promising candidate for
magnetic storage devices because of their topological stability, small size
($\sim 3-100$nm), and ultra-low threshold current density ($\sim
10^{6}$A/m$^2$) to drive their motion. However, the time-dependent dynamics has
hitherto been largely... | 1501.00444v1 |
2015-01-08 | Landau Damping of Geodesic Acoustic Mode in Toroidally Rotating Tokamaks | Geodesic acoustic mode (GAM) is analyzed by using modified gyro-kinetic (MGK)
equation applicable to low-frequency microinstabilities in a rotating
axisymmetric plasma. Dispersion relation of GAM in the presence of arbitrary
Mach number is analytically derived. Toroidal rotation plays the same effects
on the GAM regard... | 1501.01750v2 |
2015-01-17 | Applications of quantum cryptographic switch: Various tasks related to controlled quantum communication can be performed using Bell states and permutation of particles | Recently, several aspects of controlled quantum communication (e.g.,
bidirectional controlled state teleportation, controlled quantum secure direct
communication, controlled quantum dialogue, etc.) have been studied using
$n$-qubit ($n\geq3$) entanglement. Specially, a large number of schemes for
bidirectional controll... | 1501.04187v1 |
2015-02-06 | pQCD approach to Charmonium regeneration in QGP at the LHC | We analyze the applicability of perturbative QCD (pQCD) approach to the issue
of $J/\psi$ recombination at the Large Hadron Collider (LHC), and calculate the
recombination cross section for $c\bar{c}$ recombination to form $J/\psi$ as a
function of temperature. The charmonium wavefunction is obtained by employing a
tem... | 1502.01790v2 |
2015-02-06 | Biological control via "ecological" damping: An approach that attenuates non-target effects | In this work we develop and analyze a mathematical model of biological
control to prevent or attenuate the explosive increase of an invasive species
population in a three-species food chain. We allow for finite time blow-up in
the model as a mathematical construct to mimic the explosive increase in
population, enabling... | 1502.02010v1 |
2015-02-11 | On the mass determination in liquid utilizing measurement of only the fundamental flexural resonances of the micro-/nanomechanical based mass sensors | Micro-/nanomechanical mass sensors are capable to quantitatively determine
molecule mass from only first three (two) measured cantilever (bridge) resonant
frequencies. However, in liquid solutions that are relevant to most of the
biological systems, the mass determination is challenging because the Q-factor
due to flui... | 1502.03232v1 |
2015-02-13 | A Dynamical Model of Plasma Turbulence in the Solar Wind | A dynamical approach, rather than the usual statistical approach, is taken to
explore the physical mechanisms underlying the nonlinear transfer of energy,
the damping of the turbulent fluctuations, and the development of coherent
structures in kinetic plasma turbulence. It is argued that the linear and
nonlinear dynami... | 1502.04109v1 |
2015-03-19 | Vertical Oscillations of Fluid and Stellar Disks | A satellite galaxy or dark matter subhalo that passes through a stellar disk
may excite coherent oscillations in the disk perpendicular to its plane. We
determine the properties of these modes for various self-gravitating plane
symmetric systems (Spitzer sheets) using the matrix method of Kalnajs. In
particular, we fin... | 1503.05741v1 |
2015-03-24 | Linearized nonequilibrium dynamics in nonconformal plasma | We investigate the behaviour of the lowest nonhydrodynamic modes in a class
of holographic models which exhibit an equation of state closely mimicking the
one determined from lattice QCD. We calculate the lowest quasinormal mode
frequencies for a range of scalar self-interaction potentials and find that the
damping of ... | 1503.07149v1 |
2015-03-25 | The Conversion of CESR to Operate as the Test Accelerator, CesrTA, Part 1: Overview | Cornell's electron/positron storage ring (CESR) was modified over a series of
accelerator shutdowns beginning in May 2008, which substantially improves its
capability for research and development for particle accelerators. CESR's
energy span from 1.8 to 5.6 GeV with both electrons and positrons makes it
ideal for the s... | 1503.07451v2 |
2015-04-10 | Fission barrier, damping of shell correction and neutron emission in the fission of A$\sim$200 | Decay of $^{210}$Po compound nucleus formed in light and heavy-ion induced
fusion reactions has been analyzed simultaneously using a consistent
prescription for fission barrier and nuclear level density incorporating shell
correction and its damping with excitation energy. Good description of all the
excitation functio... | 1504.02599v1 |
2015-04-10 | Enhancement of the Anti-Damping Spin Torque Efficacy of Platinum by Interface Modification | We report a strong enhancement of the efficacy of the spin Hall effect (SHE)
of Pt for exerting anti-damping spin torque on an adjacent ferromagnetic layer
by the insertion of $\approx$ 0.5 nm layer of Hf between a Pt film and a thin,
< 2 nm, Fe$_{60}$Co$_{20}$B$_{20}$ ferromagnetic layer. This enhancement is
quantifie... | 1504.02806v1 |
2015-04-21 | Effect of assortative mixing in the second-order Kuramoto model | In this paper we analyze the second-order Kuramoto model presenting a
positive correlation between the heterogeneity of the connections and the
natural frequencies in scale-free networks. We numerically show that
discontinuous transitions emerge not just in disassortative but also in
assortative networks, in contrast w... | 1504.05447v1 |
2015-04-27 | Controlled merging and annihilation of localized dissipative structures in an AC-driven damped nonlinear Schrödinger system | We report studies of controlled interactions of localized dissipative
structures in a system described by the AC-driven damped nonlinear
Schr\"odinger equation. Extensive numerical simulations reveal a diversity of
interaction scenarios that are governed by the properties of the system driver.
In our experiments, perfo... | 1504.07231v1 |
2015-04-29 | Wide-Range Tunable Dynamic Property of Carbon Nanotube-Based Fibers | Carbon nanotube (CNT) fiber is formed by assembling millions of individual
tubes. The assembly feature provides the fiber with rich interface structures
and thus various ways of energy dissipation, as reflected by the non-zero loss
tangent (>0.028--0.045) at low vibration frequencies. A fiber containing
entangled CNTs ... | 1504.07881v1 |
2015-05-10 | Effects of electron drift on the collisionless damping of kinetic Alfvén waves in the solar wind | The collisionless dissipation of anisotropic Alfv\'enic turbulence is a
promising candidate to solve the solar wind heating problem. Extensive studies
examined the kinetic properties of Alfv\'en waves in simple Maxwellian or
bi-Maxwellian plasmas. However, the observed electron velocity distribution
functions in the so... | 1505.02328v1 |
2015-05-13 | The effect of a reversible shear transformation on plastic deformation of an amorphous solid | Molecular dynamics simulations are performed to investigate the plastic
response of a model glass to a local shear transformation in a quiescent
system. The deformation of the material is induced by a spherical inclusion
that is gradually strained into an ellipsoid of the same volume and then
reverted back into the sph... | 1505.03488v1 |
2015-05-14 | Local large deviations principle for occupation measures of the damped nonlinear wave equation perturbed by a white noise | We consider the damped nonlinear wave (NLW) equation driven by a spatially
regular white noise. Assuming that the noise is non-degenerate in all Fourier
modes, we establish a large deviations principle (LDP) for the occupation
measures of the trajectories. The lower bound in the LDP is of a local type,
which is related... | 1505.03686v1 |
2015-05-19 | Undamped nonequilibrium dynamics of a nondegenerate Bose gas in a 3D isotropic trap | We investigate anomalous damping of the monopole mode of a non-degenerate 3D
Bose gas under isotropic harmonic confinement as recently reported by the JILA
TOP trap experiment [D. S. Lob- ser, A. E. S. Barentine, E. A. Cornell, and H.
J. Lewandowski (in preparation)]. Given a realistic confining potential, we
develop a... | 1505.04841v1 |
2015-05-21 | Control and stabilization of degenerate wave equations | We study a wave equation in one space dimension with a general diffusion
coefficient which degenerates on part of the boundary. Degeneracy is measured
by a real parameter $\mu_a>0$. We establish observability inequalities for
weakly (when $\mu_a \in [0,1[$) as well as strongly (when $\mu_a \in [1,2[$)
degenerate equati... | 1505.05720v1 |
2015-05-23 | Existence, blow-up and exponential decay of solutions for a porous-elastic system with damping and source terms | In this paper we consider a porous-elastic system consisting of nonlinear
boundary/interior damping and nonlinear boundary/interior sources. Our interest
lies in the theoretical understanding of the existence, finite time blow-up of
solutions and their exponential decay using non-trivial adaptations of
well-known techn... | 1505.06373v2 |
2015-05-26 | Quantum Particle Motion in Absorbing Harmonic Trap | The motivation of this work is to get an additional insight into the
irreversible energy dissipation on the quantum level. The presented examination
procedure is based on the Feynman path integral method that is applied and
widened towards the calculation of the kernel of a quantum mechanical damped
oscillator. Here, i... | 1505.06874v1 |
2015-06-03 | Non-uniqueness of Admissible Weak Solutions to Compressible Euler Systems with Source Terms | We consider admissible weak solutions to the compressible Euler system with
source terms, which include rotating shallow water system and the Euler system
with damping as special examples. In the case of anti-symmetric sources such as
rotations, for general piecewise Lipschitz initial densities and some suitably
constr... | 1506.01103v1 |
2015-06-03 | The effect of perpendicular electric field on Temperature-induced plasmon excitations for intrinsic silicene | We use the tight-binding model and the random-phase approximation to
investigate the intrinsic plasmon in silicene. At finite temperatures, an
undamped plasmon is generated from the interplay between the intraband and the
interband-gap transitions. The extent of the plasmon existence range in terms
of momentum and temp... | 1506.01140v1 |
2015-06-09 | Transport Barrier generation at the interface of regions with different zonal flows dynamics | A novel and generic understanding of spontaneous generation of transport
barriers and zonation regimes in turbulent self-organization is presented. It
associates the barrier onset to the development of a spectral gap between large
scale flows and turbulence modes leading to a zonation regime. A robust barrier
builds-up... | 1506.02942v2 |
2015-06-11 | Fighting noise with noise in realistic quantum teleportation | We investigate how the efficiency of the quantum teleportation protocol is
affected when the qubits involved in the protocol are subjected to noise or
decoherence. We study all types of noise usually encountered in real world
implementations of quantum communication protocols, namely, the bit flip, phase
flip (phase da... | 1506.03803v2 |
2015-07-08 | Low-Dimensional Stochastic Projected Gross-Pitaevskii Equation | We present reduced-dimensional stochastic projected Gross-Pitaevskii
equations describing regimes of confinement and temperature where a 1D or 2D
superfluid is immersed in a 3D thermal cloud. The projection formalism provides
both a formally rigorous and physically natural way to effect the dimensional
reduction. The 3... | 1507.02023v2 |
2015-07-08 | Low-emittance storage rings | The effects of synchrotron radiation on particle motion in storage rings are
discussed. In the absence of radiation, particle motion is symplectic, and the
beam emittances are conserved. The inclusion of radiation effects in a
classical approximation leads to emittance damping: expressions for the damping
times are der... | 1507.02213v1 |
2015-07-09 | Controlling the stability of steady states in continuous variable quantum systems | For the paradigmatic case of the damped quantum harmonic oscillator we
present two measurement-based feedback schemes to control the stability of its
fixed point. The first scheme feeds back a Pyragas-like time-delayed reference
signal and the second uses a predetermined instead of time-delayed reference
signal. We sho... | 1507.02538v1 |
2015-07-14 | WIMP isocurvature perturbation and small scale structure | The adiabatic perturbation of dark matter is damped during the kinetic
decoupling due to the collision with relativistic component on sub-horizon
scales. However the isocurvature part is free from damping and could be large
enough to make a substantial contribution to the formation of small scale
structure. We explicit... | 1507.03871v2 |
2015-07-17 | Pairwise quantum discord for a symmetric multi-qubit system in different types of noisy channels | We study the pairwise quantum discord (QD) for a symmetric multi-qubit system
in different types of noisy channels, such as phase-flip, amplitude damping,
phase-damping, and depolarizing channels. Using the QD and geometric measure of
quantum discord (GMQD) to quantify quantum correlations, some analytical or
numerical... | 1507.04826v1 |
2015-07-20 | Landau damping effects in the synchronization of conformist and contrarian oscillators | Two decades ago, a phenomenon resembling Landau damping was described in the
synchronization of globally coupled oscillators: the evidence of a regime where
the order parameter decays when linear theory predicts neutral stability for
the incoherent state. We here show that such an effect is far more generic, as
soon as... | 1507.05383v1 |
2015-07-28 | Attractors for Strongly Damped Wave Equations with Nonlinear Hyperbolic Dynamic Boundary Conditions | We establish the well-posedness of a strongly damped semilinear wave equation
equipped with nonlinear hyperbolic dynamic boundary conditions. Results are
carried out with the presence of a parameter distinguishing whether the
underlying operator is analytic, $\alpha>0$, or only of Gevrey class,
$\alpha=0$. We establish... | 1507.07971v1 |
2015-07-29 | Neimark--Sacker bifurcation and evidence of chaos in a discrete dynamical model of walkers | Bouncing droplets on a vibrating fluid bath can exhibit wave-particle
behavior, such as being propelled by interacting with its own wave field. These
droplets seem to walk across the bath, and thus are dubbed walkers. Experiments
have shown that walkers can exhibit exotic dynamical behavior indicative of
chaos. While t... | 1507.08057v2 |
2015-07-30 | Beliaev damping of the Goldstone mode in atomic Fermi superfluids | Beliaev damping in a superfluid is the decay of a collective excitation into
two lower frequency collective excitations; it represents the only decay mode
for a bosonic collective excitation in a superfluid at T = 0. The standard
treatment for this decay assumes a linear spectrum, which in turn implies that
the final s... | 1507.08535v1 |
2015-08-04 | A Critical Analysis of the Feasibility of Pure Strain-Actuated Giant Magnetostrictive Nanoscale Memories | Concepts for memories based on the manipulation of giant magnetostrictive
nanomagnets by stress pulses have garnered recent attention due to their
potential for ultra-low energy operation in the high storage density limit.
Here we discuss the feasibility of making such memories in light of the fact
that the Gilbert dam... | 1508.00629v2 |
2015-08-09 | Small quantum absorption refrigerator in the transient regime: time scales, enhanced cooling and entanglement | A small quantum absorption refrigerator, consisting of three qubits, is
discussed in the transient regime. We discuss time scales for coherent
dynamics, damping, and approach to the steady state, and we study cooling and
entanglement. We observe that cooling can be enhanced in the transient regime,
in the sense that lo... | 1508.02025v2 |
2015-08-13 | Hybridization of Higgs modes in a bond-density-wave state in cuprates | Recently, several groups have reported observations of collective modes of
the charge order present in underdoped cuprates. Motivated by these
experiments, we study theoretically the oscillations of the order parameters,
both in the case of pure charge order, and for charge order coexisting with
superconductivity. Usin... | 1508.03335v1 |
2015-08-18 | Negative nonlinear damping of a graphene mechanical resonator | We experimentally investigate the nonlinear response of a multilayer graphene
resonator using a superconducting microwave cavity to detect its motion. The
radiation pressure force is used to drive the mechanical resonator in an
optomechanically induced transparency configuration. By varying the amplitudes
of drive and ... | 1508.04298v1 |
2015-08-21 | Formulation and solutions of fractional continuously variable order mass spring damper systems controlled by viscoelastic and viscous-viscoelastic dampers | The article presents the formulation and a new approach to find analytic
solutions for fractional continuously variable order dynamic models viz.
Fractional continuously variable order mass-spring damper systems. Here, we use
the viscoelastic and viscous-viscoelastic dampers for describing the damping
nature of the osc... | 1508.06202v1 |
2015-08-25 | Simultaneous cooling of coupled mechanical oscillators using whispering gallery mode resonances | We demonstrate simultaneous center-of-mass cooling of two coupled
oscillators, consisting of a microsphere-cantilever and a tapered optical
fiber. Excitation of a whispering gallery mode (WGM) of the microsphere, via
the evanescent field of the taper, provides a transduction signal that
continuously monitors the relati... | 1508.06217v2 |
2015-08-31 | Damping of a system of linear oscillators using the generalized dry friction | The problem of damping a system of linear oscillators is considered. The
problem is solved by using a control in the form of dry friction. The motion of
the system under the control is governed by a system of differential equations
with discontinuous right-hand side. A uniqueness and continuity theorem is
proved for th... | 1508.07775v2 |
2015-09-02 | Smoothing and Global Attractors for the Majda-Biello System on the Torus | In this paper, we consider the Majda-Biello system, a coupled KdV-type
system, on the torus. In the first part of the paper, it is shown that, given
initial data in a Sobolev space, the difference between the linear and the
nonlinear evolution almost always resides in a smoother space. The smoothing
index depends on nu... | 1509.00776v1 |
2015-09-07 | Non-linear Cosmic Ray propagation close to the acceleration site | Recent advances on gamma-ray observations from SuperNova Remnants and
Molecular Clouds offer the possibility to study in detail the properties of the
propagation of escaping Cosmic Rays (CR). However, a complete theory for CR
transport outside the acceleration site has not been developed yet. Two
physical processes are... | 1509.02174v1 |
2015-09-10 | Strain-dependent damping in nanomechanical resonators from thin $\mathrm{MoS_2}$ crystals | We investigate the effect of mechanical strain on the dynamics of thin
$\mathrm{MoS_2}$ nanodrum resonators. Using a piezoelectric crystal,
compressive and tensile biaxial strain is induced in initially flat and buckled
devices. In the flat device, we observe a remarkable strain-dependence of the
resonance line width, ... | 1509.03080v1 |
2015-09-16 | Variational principle for magnetisation dynamics in a temperature gradient | By applying a variational principle on a magnetic system within the framework
of extended irreversible thermodynamics, we find that the presence of a
temperature gradient in a ferromagnet leads to a generalisation of the
Landau-Lifshitz equation with an additional magnetic induction field
proportional to the temperatur... | 1509.04825v2 |
2015-10-01 | Dilapidation of nonlocal correlations of two qubit states in noisy environment | Composite quantum systems exhibit non-local correlations. These counter
intuitive correlations form a resource for quantum information processing and
quantum computation. In our previous work on two qubit maximally entangled
mixed states, we observed that entangled states, states that can be used for
quantum teleportai... | 1510.00119v1 |
2015-10-05 | Universality in antiferromagnetic strange metals | We propose a theory of metals at the spin-density wave quantum critical point
in spatial dimension $d=2$. We provide a first estimate of the full set of
critical exponents (dynamical exponent $z=2.13$, correlation length $\nu
=1.02$, spin susceptibility $\gamma = 0.96$, electronic non-Fermi liquid
$\eta^f_\tau = 0.53$,... | 1510.01331v3 |
2015-10-09 | Spin-orbit torque in Pt/CoNiCo/Pt symmetric devices | Current induced magnetization switching by spin-orbit torques offers an
energy-efficient means of writing information in heavy metal/ferromagnet (FM)
multilayer systems. The relative contributions of field-like torques and
damping-like torques to the magnetization switching induced by the electrical
current are still u... | 1510.02555v1 |
2015-10-17 | Direct evidence for minority spin gap in the Co2MnSi Heusler alloy | Half Metal Magnets are of great interest in the field of spintronics because
of their potential full spin-polarization at the Fermi level and low
magnetization damping. The high Curie temperature and predicted 0.7eV minority
spin gap make the Heusler alloy Co2MnSi very promising for applications.We
investigated the hal... | 1510.05085v1 |
2015-10-18 | Information transmission over an amplitude damping channel with an arbitrary degree of memory | We study the performance of a partially correlated amplitude damping channel
acting on two qubits. We derive lower bounds for the single-shot classical
capacity by studying two kinds of quantum ensembles, one which allows to
maximize the Holevo quantity for the memoryless channel and the other allowing
the same task bu... | 1510.05313v1 |
2015-10-29 | A Semismooth Newton Method for Tensor Eigenvalue Complementarity Problem | In this paper, we consider the tensor eigenvalue complementarity problem
which is closely related to the optimality conditions for polynomial
optimization, as well as a class of differential inclusions with nonconvex
processes. By introducing an NCP-function, we reformulate the tensor eigenvalue
complementarity problem... | 1510.08570v1 |
2015-11-15 | Mode coupling in solar spicule oscillations | In a real medium which has oscillations, the perturbations can cause the
energy transfer between different modes. The perturbation interpreted as an
interaction between the modes is inferred as mode coupling. Mode coupling
process in an inhomogeneous medium such as solar spicules may lead to the
coupling of kink waves ... | 1511.05135v1 |
2015-11-19 | Resurgence in Extended Hydrodynamics | It has recently been understood that the hydrodynamic series generated by the
M\"uller-Israel-Stewart theory is divergent, and that this large order
behaviour is consistent with the theory of resurgence. Furthermore, it was
observed, that the physical origin of this is the presence of a purely damped
nonhydrodynamic mo... | 1511.06358v2 |
2015-12-04 | Numerical solution of the stationary multicomponent nonlinear Schrödinger equation with a constraint on the angular momentum | We formulate a damped oscillating particle method to solve the stationary
nonlinear Schr\"{o}dinger equation (NLSE). The ground state solutions are found
by a converging damped oscillating evolution equation that can be discretized
with symplectic numerical techniques. The method is demonstrated for three
different cas... | 1512.01441v2 |
2015-12-08 | Influence of kinetic effects on the spectrum of a parallel electrode probe | Active Plasma Resonance Spectroscopy (APRS) denotes a class of diagnostic
techniques which utilize the natural ability of plasmas to resonate on or near
the electron plasma frequency. One particular class of APRS can be described in
an abstract notation based on functional analytic methods in electrostatic
approximatio... | 1512.02450v1 |
2015-12-09 | Long time behaviors for 3D cubic damped Klein-Gordon equations in inhomogeneous mediums | In this paper, we study the asymptotic dynamics of global solutions to damped
Klein-Gordon equations in inhomogeneous mediums (KGI). In the defocusing case,
we prove for any initial data, the solution is globally define in forward time
and it will converge to an equilibrium. In the focusing case, for global
solutions, ... | 1512.02755v3 |
2015-12-10 | Strong Frequency Dependence in Over-damped Systems | Strong frequency dependence is unlikely in diffusive or over-damped systems.
When exceptions do occur, such as in the case of stochastic resonance, it
signals an interesting underlying phenomenon. We find that such a case appears
in the motion of a particle in a diffusive environment under the effect of
periodically os... | 1512.03187v1 |
2015-12-16 | Parity-time symmetry breaking in magnetic systems | The understanding of out-of-equilibrium physics, especially dynamic
instabilities and dynamic phase transitions, is one of the major challenges of
contemporary science, spanning the broadest wealth of research areas that range
from quantum optics to living organisms. Focusing on nonequilibrium dynamics of
an open dissi... | 1512.05408v2 |
2016-01-11 | Damping of Landau levels in neutral graphene at low magnetic fields: A phonon Raman scattering study | Landau level broadening mechanisms in electrically neutral and quasineutral
graphene were investigated through micro-magneto-Raman experiments in three
different samples, namely, a natural single-layer graphene flake and a
back-gated single-layer device, both deposited over Si/SiO2 substrates, and a
multilayer epitaxia... | 1601.02663v3 |
2016-01-21 | Negative frequencies in wave propagation: a microscopic model | A change in the sign of the frequency of a wave between two inertial
reference frames corresponds to a reversal of the phase velocity. Yet from the
point of view of the relation $E=\hbar\omega$, a positive quantum of energy
apparently becomes a negative energy one. This is physically distinct from a
change in the sign ... | 1601.05636v1 |
2016-01-26 | On the wave equation with hyperbolic dynamical boundary conditions, interior and boundary damping and supercritical sources | The aim of the paper is to study the problem $$ \begin{cases} u_{tt}-\Delta
u+P(x,u_t)=f(x,u) \qquad &\text{in $(0,\infty)\times\Omega$,} u=0 &\text{on
$(0,\infty)\times \Gamma_0$,} u_{tt}+\partial_\nu u-\Delta_\Gamma
u+Q(x,u_t)=g(x,u)\qquad &\text{on $(0,\infty)\times \Gamma_1$,}
u(0,x)=u_0(x),\quad u_t(0,x)=u_1(x) & ... | 1601.07075v3 |
2016-01-29 | Numerical Simulation of Tidal Evolution of a Viscoelastic Body Modelled with a Mass-Spring Network | We use a damped mass-spring model within an N-body code to simulate the tidal
evolution of the spin and orbit of a self-gravitating viscoelastic spherical
body moving around a point-mass perturber. The damped mass-spring model
represents a Kelvin-Voigt viscoelastic solid. We measure the tidal quality
function (the dyna... | 1601.08222v2 |
2016-02-04 | Highly efficient two photon generation from a coherently pumped quantum dot embedded in a microcavity | We propose a scheme to realize a highly efficient solid state source of
photon pairs using cavity-assisted stimulated Raman adiabatic passage (STIRAP)
in a single quantum dot, where a single photon from pump pulse and two stokes
photons from cavity mode drives the Raman transition. The Autler-Townes
doublet, generated ... | 1602.01562v1 |
2016-02-09 | Preservation of quantum key rate in the presence of decoherence | It is well known that the interaction of quantum systems with the environment
reduces the inherent quantum correlations. Under special circumstances the
effect of decoherence can be reversed, for example, the interaction modeled by
an amplitude damping channel can boost the teleportation fidelity from the
classical to ... | 1602.02903v1 |
2016-02-19 | An accelerated exponential time integrator for semi-linear stochastic strongly damped wave equation with additive noise | This paper is concerned with the strong approximation of a semi-linear
stochastic wave equation with strong damping, driven by additive noise. Based
on a spatial discretization performed by a spectral Galerkin method, we
introduce a kind of accelerated exponential time integrator involving linear
functionals of the noi... | 1602.06050v1 |
2016-02-23 | The calibration and electron energy reconstruction of the BGO ECAL of the DAMPE detector | The DArk Matter Particle Explorer (DAMPE) is a space experiment designed to
search for dark matter indirectly by measuring the spectra of photons,
electrons, and positrons up to 10 TeV. The BGO electromagnetic calorimeter
(ECAL) is its main sub-detector for energy measurement. In this paper, the
instrumentation and dev... | 1602.07015v1 |
2016-02-25 | Order-disorder transition in repulsive self-propelled particle systems | We study the collective dynamics of repulsive self-propelled particles. The
particles are governed by coupled equations of motion that include polar
self-propulsion, damping of velocity and of polarity, repulsive
particle-particle interaction, and deterministic dynamics. Particle dynamics
simulations show that the coll... | 1602.07971v2 |
2016-03-01 | Ferromagnetic resonance and magnetic damping in C-doped Mn5Ge3 | Ferromagnetic resonance (FMR) was used to investigate the static and dynamic
magnetic properties of carbon-doped Mn5Ge3 (C$_{0.1}$ and C$_{0.2}$) thin films
grown on Ge(111). The temperature dependence of magnetic anisotropy shows an
increased perpendicular magneto-crystalline contribution at 80K with an
in-plane easy ... | 1603.00190v1 |
2016-03-01 | Probing superfluidity in a quasi two-dimensional Bose gas through its local dynamics | We report direct evidence of superfluidity in a quasi two-dimensional Bose
gas by observing its dynamical response to a collective excitation. Relying on
a novel local correlation analysis, we are able to probe inhomogeneous clouds
and reveal their local dynamics. We identify in this way the superfluid and
thermal phas... | 1603.00434v2 |
2016-03-03 | Backreaction Effects on Nonequilibrium Spectral Function | We show how to compute the spectral function for a scalar theory in two
different scenarios: one which disregards back-reaction i.e. the response of
the environment to the external particle, and the other one where back-reaction
is considered. The calculation was performed using the Kadanoff-Baym equation
through the K... | 1603.01118v1 |
2016-04-06 | Brownian motion of a matter-wave bright soliton: realizing a quantum pollen grain | Taking an open quantum systems approach, we derive a collective equation of
motion for the dynamics of a matter-wave bright soliton moving through a
thermal cloud of a distinct atomic species. The reservoir interaction involves
energy transfer without particle transfer between the soliton and thermal
cloud, thus dampin... | 1604.01487v1 |
2016-04-06 | Quantum backaction and noise interference in asymmetric two-cavity optomechanical systems | We study the effect of cavity damping asymmetries on backaction in a
"membrane-in-the-middle" optomechanical system, where a mechanical mode
modulates the coupling between two photonic modes. We show that in the
adiabatic limit, this system generically realizes a dissipative optomechanical
coupling, with an effective p... | 1604.01703v1 |
2016-04-08 | Discrete Breathers and Multi-Breathers in Finite Vibro-Impact Chain | We explore dynamics of discrete breathers and multi-breathers in finite
one-dimensional chain. The model involves parabolic on-site potential with
rigid constraints and linear nearest-neighbor coupling. The rigid non-ideal
impact constraints are the only source of nonlinearity and damping in the
model. The model allows... | 1604.02296v1 |
2016-04-16 | A broadband Ferromagnetic Resonance dipper probe for magnetic damping measurements from 4.2 K to 300 K | A dipper probe for broadband Ferromagnetic Resonance (FMR) operating from 4.2
K to room temperature is described. The apparatus is based on a 2-port
transmitted microwave signal measurement with a grounded coplanar waveguide.
The waveguide generates a microwave field and records the sample response. A
3-stage dipper de... | 1604.04688v1 |
2016-04-22 | A Liapunov function approach to the stabilization of second order coupled systems | In 2002, Fatiha Alabau, Piermarco Cannarsa and Vilmos Komornik investigated
the extent of asymptotic stability of the null solution for weakly coupled
partially damped equations of the second order in time. The main point is that
the damping operator acts only on the first component and, whenever it is
bounded, the cou... | 1604.06547v1 |
2016-04-28 | Temperature Dependence of Viscosity in Normal Fluid $^3$He Below 800mK Determined by a Micro-electro-mechanical Oscillator | A micro-electro-mechanical system vibrating in its shear mode was used to
study the viscosity of normal liquid $^3$He from 20mK to 770mK at 3bar, 21bar,
and 29bar. The damping coefficient of the oscillator was determined by
frequency sweeps through its resonance at each temperature. Using a slide film
damping model, th... | 1604.08554v1 |
2016-05-03 | Including atomic vibrations in XANES calculations: polarization-dependent damping of the fine structure at the Cu K edge of (creat)$_{2}$CuCl$_{4}$ | Atomic vibrations are usually not taken into account when analyzing x-ray
absorption near edge structure (XANES) spectra. One of the reasons is that
including the vibrations in a formally exact way is quite complicated while the
effect of vibrations is supposed to be small in the XANES region. By analyzing
polarized Cu... | 1605.00861v1 |
2016-05-10 | Damped wave systems on networks: Exponential stability and uniform approximations | We consider a damped linear hyperbolic system modelling the propagation of
pressure waves in a network of pipes. Well-posedness is established via
semi-group theory and the existence of a unique steady state is proven in the
absence of driving forces. Under mild assumptions on the network topology and
the model paramet... | 1605.03066v1 |
2016-05-14 | The damped oscillating propagation of the compensating self-accelerating beams | We report a new form of compensating accelerating beam generated by amplitude
modulation of the symmetric Airy beam (SAB) caustics with an exponential
apodization mask. Our numerical study manifests that the compensating beam is
with one main-lobe beam structure and can maintain the mean-intensity invariant
both in the... | 1605.04392v1 |
2016-05-14 | Detecting Damped Lyman-$α$ Absorbers with Gaussian Processes | We develop an automated technique for detecting damped Lyman-$\alpha$
absorbers (DLAs) along spectroscopic lines of sight to quasi-stellar objects
(QSOs or quasars). The detection of DLAs in large-scale spectroscopic surveys
such as SDSS-III sheds light on galaxy formation at high redshift, showing the
nucleation of ga... | 1605.04460v2 |
2016-05-17 | Direct observation of dynamic modes excited in a magnetic insulator by pure spin current | Excitation of magnetization dynamics by pure spin currents has been recently
recognized as an enabling mechanism for spintronics and magnonics, which allows
implementation of spin-torque devices based on low-damping insulating magnetic
materials. Here we report the first spatially-resolved study of the dynamic
modes ex... | 1605.05211v1 |
2016-05-18 | Damped Arrow-Hurwicz algorithm for sphere packing | We consider algorithms that, from an arbitrarily sampling of $N$ spheres
(possibly overlapping), find a close packed configuration without overlapping.
These problems can be formulated as minimization problems with non-convex
constraints. For such packing problems, we observe that the classical iterative
Arrow-Hurwicz ... | 1605.05473v1 |
2016-05-17 | Dynamics of sessile drops. Part 3. Theory of forced oscillations | A partially-wetting sessile drop is driven by a sinusoidal pressure field
that produces capillary waves on the liquid/gas interface. The analysis
presented in Part 1 of this series (Bostwick & Steen 2014) is extended by
computing response diagrams and phase shifts for the viscous droplet, whose
three phase contact-line... | 1605.05533v1 |
2016-05-18 | Electrical control over perpendicular magnetization switching driven by spin-orbit torques | Flexible control of magnetization switching by electrical manners is crucial
for applications of spin-orbitronics. Besides of a switching current that is
parallel to an applied field, a bias current that is normal to the switching
current is introduced to tune the magnitude of effective damping-like and
field-like torq... | 1605.05569v1 |
2016-05-25 | Quadratic band touching with long range interactions in and out of equilibrium | Motivated by recent advances in cold atomic systems, we study the equilibrium
and quench properties of two dimensional fermions with quadratic band touching
at the Fermi level, in the presence of infinitely long range interactions.
Unlike when only short range interactions are present, both nematic and quantum
anomalou... | 1605.07932v1 |
2016-05-26 | Asymmetric Quantum Dialogue in Noisy Environment | A notion of asymmetric quantum dialogue (AQD) is introduced. Conventional
protocols of quantum dialogue are essentially symmetric as both the users
(Alice and Bob) can encode the same amount of classical information. In
contrast, the scheme for AQD introduced here provides different amount of
communication powers to Al... | 1605.08363v1 |
2016-05-27 | A reduced model for precessional switching of thin-film nanomagnets under the influence of spin-torque | We study the magnetization dynamics of thin-film magnetic elements with
in-plane magnetization subject to a spin-current flowing perpendicular to the
film plane. We derive a reduced partial differential equation for the in-plane
magnetization angle in a weakly damped regime. We then apply this model to
study the experi... | 1605.08698v1 |
2016-06-11 | Parameter identification in a semilinear hyperbolic system | We consider the identification of a nonlinear friction law in a
one-dimensional damped wave equation from additional boundary measurements.
Well-posedness of the governing semilinear hyperbolic system is established via
semigroup theory and contraction arguments. We then investigte the inverse
problem of recovering the... | 1606.03580v1 |
2016-06-16 | Design of the readout electronics for the DAMPE Silicon Tracker detector | The Silicon Tracker (STK) is a detector of the DAMPE satellite to measure the
incidence direction of high energy cosmic ray. It consists of 6 X-Y double
layers of silicon micro-strip detectors with 73,728 readout channels. It's a
great challenge to readout the channels and process the huge volume of data in
the critica... | 1606.05080v1 |
2016-06-20 | Classical analogue of the continuous transition between the Weisskopf-Wigner exponential decay and the Rabi oscillation | When a discrete state is coupled to a continuum, the dynamics can be
described either by the Weisskopf-Wigner exponential decay or by the Rabi
oscillation, depending on the relative magnitudes of the continuum width and of
the Rabi frequency. A continuous transition between these two regimes exists,
as demonstrated in ... | 1606.06153v1 |
2016-06-21 | Torsion Effects and LLG Equation | Based on the non-relativistic regime of the Dirac equation coupled to a
torsion pseudo-vector, we study the dynamics of magnetization and how it is
affected by the presence of torsion. We consider that torsion interacting terms
in Dirac equation appear in two ways one of these is thhrough the covariant
derivative consi... | 1606.06610v1 |
2016-07-05 | Quantum Zeno and Anti-Zeno Effects on the Entanglement Dynamics of Qubits Dissipating into a Common and non-Markovian Environment | We investigate the quantum Zeno and anti-Zeno effects on pairwise
entanglement dynamics of a collective of non-interacting qubits which have been
initially prepared in a Werner state and are off-resonantly coupled to a common
and non-Markovian environment. We obtain the analytical expression of the
concurrence in the a... | 1607.01160v1 |
2016-07-05 | Magnetic moment of inertia within the breathing model | An essential property of magnetic devices is the relaxation rate in magnetic
switching which strongly depends on the energy dissipation and magnetic inertia
of the magnetization dynamics. Both parameters are commonly taken as a
phenomenological entities. However very recently, a large effort has been
dedicated to obtai... | 1607.01307v1 |
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