publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2017-04-08 | Improved Parameter Estimation Techniques for Induction Motors using Hybrid Algorithms | The performance of Newton-Raphson, Levenberg-Marquardt, Damped Newton-Raphson
and genetic algorithms are investigated for the estimation of induction motor
equivalent circuit parameters from commonly available manufacturer data. A new
hybrid algorithm is then proposed that combines the advantages of both descent
and na... | 1704.02424v1 |
2017-04-19 | Fractional Herglotz Variational Principles with Generalized Caputo Derivatives | We obtain Euler-Lagrange equations, transversality conditions and a
Noether-like theorem for Herglotz-type variational problems with Lagrangians
depending on generalized fractional derivatives. As an application, we consider
a damped harmonic oscillator with time-depending mass and elasticity, and
arbitrary memory effe... | 1704.05697v1 |
2017-04-24 | Performance Evaluation of the Zero-Multipole Summation Method in Modern Molecular Dynamics Software | We evaluate the practical performance of the zero-multiple summation method
(ZMM), a method for approximately calculating electrostatic interactions in
molecular dynamics simulations. The performance of the ZMM is compared with
that of the smooth particle mesh Ewald method (SPME). Even though the ZMM uses
a larger cuto... | 1704.07071v1 |
2017-04-04 | Gravity Induced Resonant Emission | The gravitational drift of ions relative to the electrons induces two type of
waves in magnetized plasma; ion acoustic (IO) waves and lower hybrid (LH)
waves. The IO waves induced by the gravity are damped by electromagnetic (EM)
waves leads to the formation of LH waves. For higher wave vector, these LH wave
results in... | 1704.07225v1 |
2017-05-12 | Controlling Multimode Optomechanical Interactions via Interference | We demonstrate optomechanical interference in a multimode system, in which an
optical mode couples to two mechanical modes. A phase-dependent
excitation-coupling approach is developed, which enables the observation of
constructive and destructive optomechanical interferences. The destructive
interference prevents the c... | 1705.04722v1 |
2017-05-18 | Band Gap Formation and Tunability in Stretchable Serpentine Interconnects | Serpentine interconnects are highly stretchable and frequently used in
flexible electronic systems. In this work, we show that the undulating geometry
of the serpentine interconnects will generate phononic band gaps to manipulate
elastic wave propagation. The interesting effect of `bands-sticking-together'
is observed.... | 1705.06658v2 |
2017-05-20 | Dispersion and decay of collective modes in neutron star cores | We calculate the frequencies of collective modes of neutrons, protons and
electrons in the outer core of neutron stars. The neutrons and protons are
treated in a hydrodynamic approximation and the electrons are regarded as
collisionless. The coupling of the nucleons to the electrons leads to Landau
damping of the colle... | 1705.07357v2 |
2017-05-20 | Biosensing using Functionally Graded Piezoelectric MEMS Resonators | Nonlinear dynamics of a two-side electro-statically actuated capacitive
micro-beam is studied. The piezoelectric actuation leads to the generation of
an axial force along the length of the micro-beam and this is used as a tuning
tool to shift the primary resonance of the micro-resonator. The governing
equation of motio... | 1705.08267v1 |
2017-05-24 | X-Ray Amplification by Stimulated Brillouin Scattering | Plasma-based parametric amplification using stimulated Brillouin scattering
offers a route to coherent x-ray pulses orders-of-magnitude more intense than
those of the brightest available sources. Brillouin amplification permits
amplification of shorter wavelengths with lower pump intensities than Raman
amplification, w... | 1705.08599v2 |
2017-05-24 | Long-lived mesoscopic entanglement between two damped infinite harmonic chains | We consider two chains, each made of $N$ independent oscillators, immersed in
a common thermal bath and study the dynamics of their mutual quantum
correlations in the thermodynamic, large-$N$ limit. We show that dissipation
and noise due to the presence of the external environment are able to generate
collective quantu... | 1705.08648v1 |
2017-05-24 | Effect of radiation damping on the Child-Langmuir law in open diodes | We present a microscopic derivation of the space charge limited current for
the motion of non-relativistic charged particles inside a parallel vacuum tube
diode taking into account the radiation reaction force. We study the space
charged limited current for two different limiting cases. Our results reveal
that in the l... | 1705.09567v2 |
2017-05-29 | Deterministic preparation of highly non-classical macroscopic quantum states | We present a scheme to deterministically prepare non-classical quantum states
of a massive mirror including highly non-Gaussian states exhibiting sizeable
negativity of the Wigner function. This is achieved by exploiting the
non-linear light-matter interaction in an optomechanical cavity by driving the
system with opti... | 1705.10334v2 |
2017-06-01 | Nonlinear transport by vortex tangles in cuprate high-temperature superconductors | A unified model of vortex tangles is proposed to describe unconventional
transport in cuprate high-temperature superconductors, which not only captures
the fast vortices scenario at low density, but also predicts a novel mechanism
of core-core collisions in dense vortex fluid regime. The theory clarifies the
nature of ... | 1706.00228v1 |
2017-06-16 | Distributed Estimation of Oscillations in Power Systems: an Extended Kalman Filtering Approach | Online estimation of electromechanical oscillation parameters provides
essential information to prevent system instability and blackout and helps to
identify event categories and locations. We formulate the problem as a state
space model and employ the extended Kalman filter to estimate oscillation
frequencies and damp... | 1706.05355v1 |
2017-06-20 | Relative and Mean Motions of Multi-Machine Power Systems in Classical Model | It is well-known that in an m-machine power system where each machine is
represented by a second-order differential equation, the Jacobian of the system
equation contains (m-1) pairs of conjugate eigenvalues and two real
eigenvalues, including at least one zero. This letter proves that under the
uniform damping conditi... | 1706.06226v1 |
2017-06-25 | Influence of qubits' nonradiative decay into a common bath on the transport properties of microwave photons | We consider the influence of nonradiative damping of qubits on the microwave
transport of photons, propagating in an open one-dimensional microstrip line.
Within the framework of the formalism of a non-Hermitian Hamiltonian we
obtained the expressions for the transmission and reflection coefficients for
two qubits whic... | 1706.08028v2 |
2017-06-26 | Complexity of the Regularized Newton Method | Newton's method for finding an unconstrained minimizer for strictly convex
functions, generally speaking, does not converge from any starting point.
We introduce and study the damped regularized Newton's method (DRNM). It
converges globally for any strictly convex function, which has a minimizer in
$R^n$.
Locally D... | 1706.08483v1 |
2018-02-02 | Energy decay and global solutions for a damped free boundary fluid-elastic structure interface model with variable coefficients in elasticity | We cope with a free boundary fluid-structure interaction model. In the model,
the viscous incompressible fluid interacts with elastic body via the common
boundary. The motion of the fluid is governed by Navier-Stokes equations while
the displacement of elastic structure is described by variable coefficient wave
equatio... | 1802.00585v2 |
2018-06-30 | Global Well-Posedness and Exponential Stability for Heterogeneous Anisotropic Maxwell's Equations under a Nonlinear Boundary Feedback with Delay | We consider an initial-boundary value problem for the Maxwell's system in a
bounded domain with a linear inhomogeneous anisotropic instantaneous material
law subject to a nonlinear Silver-Muller-type boundary feedback mechanism
incorporating both an instantaneous damping and a time-localized delay effect.
By proving th... | 1807.00098v2 |
2018-07-05 | Generalized Adiabatic Theorem and Strong-Coupling Limits | We generalize Kato's adiabatic theorem to nonunitary dynamics with an
isospectral generator. This enables us to unify two strong-coupling limits: one
driven by fast oscillations under a Hamiltonian, and the other driven by strong
damping under a Lindbladian. We discuss the case where both mechanisms are
present and pro... | 1807.02036v2 |
2018-07-13 | Weighted $L^2-L^2$ estimate for wave equation and its applications | In this work we establish a weighted $L^2-L^2$ estimate for inhomogeneous
wave equation in 3-D, by introducing a Morawetz multiplier with weight of power
$s(1<s<2)$, and then integrating on the light cones and $t$ slice. With this
weighted $L^2-L^2$ estimate in hand, we may give a new proof of global
existence for smal... | 1807.05109v1 |
2018-07-14 | Non-Markovianity through quantum coherence in an all-optical setup | We propose an all-optical experiment to quantify non-Markovianity in an open
quantum system through quantum coherence of a single quantum bit. We use an
amplitude damping channel implemented by an optical setup with an intense laser
beam simulating a single-photon polarization. The optimization over initial
states requ... | 1807.05378v2 |
2018-07-17 | Energy decay for evolution equations with delay feedbacks | We study abstract linear and nonlinear evolutionary systems with single or
multiple delay feedbacks, illustrated by several concrete examples. In
particular, we assume that the operator associated with the undelayed part of
the system generates an exponentially stable semigroup and that the delay
damping coefficients a... | 1807.06445v2 |
2018-07-31 | Cooling of the rotation of a nanodiamond via the interaction with the electron spin of the contained NV-center | We propose a way to cool the rotation of a nanodiamond, which contains a
NV-center and is levitated by an optical tweezer.
Following the rotation of the particle, the NV-center electron spin
experiences varying external fields and so leads to spin-rotation coupling. By
optically pumping the electrons from a higher en... | 1807.11647v1 |
2018-08-02 | Enhanced Attenuation Arising from Lattice Resonances in a Plasma Photonic Crystal | We describe the experimental verification of lattice resonances in
two-dimensional photonic crystals constructed from an array of gaseous plasma
columns. Enhancements are seen in the extinction of normal incidence transverse
electric electromagnetic waves when the localized surface plasmon modes of the
plasma columns a... | 1808.00610v1 |
2018-08-10 | On the compactness of weak solutions to the Navier-Stokes-Korteweg equations for capillary fluids | In this paper we consider the Navier-Stokes-Korteweg equations for a viscous
compressible fluid with capillarity effects in three space dimensions. We prove
compactness of finite energy weak solutions for large initial data. In contrast
with previous results regarding this system, vacuum regions are allowed in the
defi... | 1808.03495v2 |
2018-08-10 | Collision quenching in the ultrafast dynamics of plasmonic materials | We explore the nonlinear response of plasmonic materials driven by ultrashort
pulses of electromagnetic radiation with temporal duration of few femtoseconds
and high peak intensity. By developing the Fokker-Planck-Landau theory of
electron collisions, we solve analytically the collisional integral and derive
a novel se... | 1808.03669v1 |
2018-08-11 | Beam Breakup Mitigation by Ion Mobility in Plasma Acceleration | Moderate ion mobility provides a source of damping in the plasma wakefield
acceleration, which may serve as an effective remedy against the transverse
instability of the trailing bunch. Ion mobility in the fields of the driving
and trailing bunches is taken into account; the related effects are estimated
for the FACET-... | 1808.03860v2 |
2018-08-22 | Weak convergence of Euler-Maruyama's approximation for SDEs under integrability condition | This work establishes the weak convergence of Euler-Maruyama's approximation
for stochastic differential equations (SDEs) with singular drifts under the
integrability condition in lieu of the widely used growth condition. This
method is based on a skillful application of the dimension-free Harnack
inequality. Moreover,... | 1808.07250v1 |
2018-09-30 | Dynamic behaviour of a ring coupled boost converter system with passivity-based control | This paper discusses a dispersed generation system of multiple DC/DC
converters with DC power sources connected in a ring formulation. Here is
presented the analysis of the system based on the stored energy and passivity
characteristics of the system. Passivity Based Control (PBC), with its
energy-modifying and damping... | 1810.00417v1 |
2018-10-08 | Screening in the finite-temperature reduced Hartree-Fock model | We prove the existence of solutions of the reduced Hartree-Fock equations at
finite temperature for a periodic crystal with a small defect, and show total
screening of the defect charge by the electrons. We also show the convergence
of the damped self-consistent field iteration using Kerker preconditioning to
remove ch... | 1810.03342v2 |
2018-10-17 | A natural 4-parameter family of covariance functions for stationary Gaussian processes | A four-parameter family of covariance functions for stationary Gaussian
processes is presented. We call it 2Dsys. It corresponds to the general
solution of an autonomous second-order linear stochastic differential equation,
thus arises naturally from modelling. It covers underdamped and overdamped
systems, so it is pro... | 1810.07738v1 |
2018-10-29 | Nonlinear Semi-Classical 3D Quantum Spin | In an effort to provide an alternative method to represent a quantum spin, a
precise 3D nonlinear dynamics method is used. A two-sided torque function is
created to mimic the unique behavior of the quantum spin. A full 3D
representation of the magnetic field of a Stern-Gerlach device was used as in
the original experim... | 1810.12424v1 |
2019-01-03 | Ultrafast carrier relaxation and its Pauli drag in photo-enhanced melting of solids | Ultrafast light-matter interaction is a powerful tool for the study of
solids. Upon laser excitation, carrier multiplication and lattice acceleration
beyond thermal velocity can occur, as a result of far-from-equilibrium carrier
relaxation. The roles of electron-electron and electron-phonon scatterings are
identified b... | 1901.00609v1 |
2019-01-04 | Event-triggered damping stabilization of a linear wave equation | The paper addresses the design of an event-triggering mechanism for a partial
differential wave equation posed in a bounded domain. The wave equation is
supposed to be controlled through a first order time derivative term
distributed in the whole domain. Sufficient conditions based on the use of
suitable Lyapunov funct... | 1901.01009v1 |
2019-01-18 | On Quantum Fields at High Temperature | Revisiting the fast fermion damping rate calculation in a thermalized QED
and/or QCD plasma at 4-loop order, focus is put on a peculiar perturbative
structure which has no equivalent at zero-temperature. Not surprisingly and in
agreement with previous $C^\star$-algebraic analyses, this structure renders
the use of ther... | 1901.06338v2 |
2019-01-23 | Global well-posedness for the Phan-Thein-Tanner model in critical Besov spaces without damping | In this paper, we mainly investigate the Cauchy problem for the
Phan-Thein-Tanner (PTT) model. The PPT model can be viewed as a Navier-Stokes
equations couple with a nonlinear transport system. This model is derived from
network theory for the polymeric fluid. We study about the global well
posedness of the PTT model i... | 1901.08515v1 |
2019-01-27 | Breaking optomechanical cooling limit by two drive fields on a membrane-in-middle system | We present a theoretical scheme for ground state cooling of a mechanical
resonator in a membrane-in-middle optomechanical system (OMS) driven by two
red-detuned drive fields. The details of dynamical evolution of OMS are
provided, and the effect of system conditions on cooling results are
systematically studied. Most i... | 1901.09338v1 |
2019-04-03 | Comparison of semiclassical and quantum models of a two-level atom-cavity QED system in the strong coupling regime | We present a numerical study comparing semiclassical and quantum models of a
damped, strongly interacting cavity QED system composed of a single two-level
atom interacting with a single quantized cavity mode driven externally by a
tunable monochromatic field. We compute the steady state transmission spectrum
of the cou... | 1904.02270v2 |
2019-04-04 | Comparison between isothermal collision-streaming and finite-difference lattice Boltzmann models | We present here a comparison between collision-streaming and
finite-difference lattice Boltzmann (LB) models. This study provides a
derivation of useful formulae which help one to properly compare the simulation
results obtained with both LB models. We consider three physical problems: the
shock wave propagation, the d... | 1904.02471v1 |
2019-04-07 | Remarks on decay effects of regularity loss type wave equations with structural damping terms | After GGH model was proposed by M. Ghisi, M. Gobbino and A. Haraux (2016), R.
Ikehata and S. Iyota (2018) showed decay estimates for the total energy of
solutions to GGH equations uniformly in the initial data. However, their
results imply that the total energy is bounded when the initial data belong to
the energy spac... | 1904.03686v1 |
2019-04-18 | Equilibrium properties and decoherence of an open harmonic oscillator | The equilibrium properties of an open harmonic oscillator are considered in
three steps: First the creation and destruction operators are generalized for
open dynamics and the creation operator is used to construct coherent states.
The second step consists of the introduction of the Heisenberg representation
where the ... | 1904.08706v2 |
2019-04-18 | Rellich, Gagliardo-Nirenberg, Trudinger and Caffarelli-Kohn-Nirenberg inequalities for Dunkl operators and applications | In this paper we obtain weighted higher order Rellich, weighted
Gagliardo-Nirenberg, Trudinger, Caffarelli-Kohn-Nirenberg inequalities and the
uncertainty principle for Dunkl operators. Moreover, we introduce an extension
of the classical Caffarelli-Kohn-Nirenberg inequalities. Furthermore, we give
an application of Ga... | 1904.08725v2 |
2019-04-19 | Axi-symmetrization near point vortex solutions for the 2D Euler equation | We prove a definitive theorem on the asymptotic stability of point vortex
solutions to the full Euler equation in 2 dimensions. More precisely, we show
that a small, Gevrey smooth, and compactly supported perturbation of a point
vortex leads to a global solution of the Euler equation in 2D, which converges
weakly as $t... | 1904.09170v1 |
2019-04-21 | Quantum state preparation for coupled period tripling oscillators | We investigate the quantum transition to a correlated state of coupled
oscillators in the regime where they display period tripling in response to a
drive at triple the eigenfrequency. Correlations are formed between the
discrete oscillation phases of individual oscillators. The evolution toward the
ordered state is ac... | 1904.09628v1 |
2019-04-28 | Quantum noise in the spin transfer torque effect | Describing the microscopic details of the interaction of magnets and
spin-polarized currents is key to achieve control of such systems at the
microscopic level. Here we discuss a description based on the Keldysh
technique, casting the problem in the language of open quantum systems. We
reveal the origin of noise in the... | 1904.12372v1 |
2019-06-03 | Magnon-phonon interactions in magnetic insulators | We address the theory of magnon-phonon interactions and compute the
corresponding quasi-particle and transport lifetimes in magnetic insulators
with focus on yttrium iron garnet at intermediate temperatures from anisotropy-
and exchange-mediated magnon-phonon interactions, the latter being derived from
the volume depen... | 1906.01042v1 |
2019-06-17 | Time discretization of an initial value problem for a simultaneous abstract evolution equation applying to parabolic-hyperbolic phase-field systems | This article deals with a simultaneous abstract evolution equation. This
includes a parabolic-hyperbolic phase-field system as an example which consists
of a parabolic equation for the relative temperature coupled with a semilinear
damped wave equation for the order parameter. Although a time discretization of
an initi... | 1906.06887v1 |
2019-06-20 | Low-cost ultrasonic distance measurement in a mechanical resonance experiment | We present a low-cost, dual-probe position sensor in a mechanical resonance
experiment suitable for deployment in large lab courses with multiple stations.
The motion of the two ends of a driven, damped spring oscillator is recorded
with US-100 ultrasonic distance sensors and ESP8266 microcontrollers. Sensor
lag is com... | 1906.08778v1 |
2019-06-25 | Finite-Dimensional Controllers for Robust Regulation of Boundary Control Systems | We study the robust output regulation of linear boundary control systems by
constructing extended systems. The extended systems are established based on
solving static differential equations under two new conditions. We first
consider the abstract setting and present finite-dimensional reduced order
controllers. The co... | 1906.10345v3 |
2019-07-06 | Angle-resolved broadband ferromagnetic resonance apparatus enabled through a spring-loaded sample mounting manipulator | Broadband ferromagnetic resonance is a useful technique to determine the
magnetic anisotropy and study the magnetization dynamics of magnetic thin
films. We report a spring-loaded sample loading manipulator for reliable sample
mounting and rotation. The manipulator enables maximum signal, enhances system
stability and ... | 1907.03097v1 |
2019-07-23 | Trees and Islands -- Machine learning approach to nuclear physics | We implement machine learning algorithms to nuclear data. These algorithms
are purely data driven and generate models that are capable to capture
intricate trends. Gradient boosted trees algorithm is employed to generate a
trained model from existing nuclear data, which is used for prediction for data
of damping parame... | 1907.09764v1 |
2019-07-31 | Multiple Energy Storage Rings | Energy recovery linacs have been studied and developed over a number of
decades. In the standard arrangement there is a separate particle source and
particle beam dump. In this paper, a new arrangement is explored where the
energy recovery linac is used as an energy source in a storage ring which has
multiple beam ener... | 1907.13461v1 |
2019-10-07 | Quasiclassical nonlinear plasmon resonance in graphene | Electrons in graphene behave like relativistic Dirac particles which can
reduce velocity of light by two orders of magnitude in the form of
plasmon-polaritons. Here we show how these properties lead to a peculiar
nonlinear plasmon response in the quasiclassical regime of terahertz
frequencies. On one hand we show how i... | 1910.03017v2 |
2019-10-18 | Square-integrable eigenfunctions in quantizing the Bateman oscillator model | In a recent paper [Phys. Lett. A 383 (2019) 2836; arXiv:1906.05121
[quant-ph]], Bagarello, Gargano, and Roccati have claimed that no
square-integrable vacuum exists in quantizing the Bateman oscillator model. In
this paper, we rebut their claim by actually deriving the square-integrable
vacuum eigenfunction using a com... | 1910.08271v1 |
2019-10-25 | A damped forward-backward algorithm for stochastic generalized Nash equilibrium seeking | We consider a stochastic generalized Nash equilibrium problem (GNEP) with
expected-value cost functions. Inspired by Yi and Pavel (Automatica, 2019), we
propose a distributed GNE seeking algorithm by exploiting the forward-backward
operator splitting and a suitable preconditioning matrix. Specifically, we
apply this me... | 1910.11776v2 |
2019-10-27 | Phase slip statistics of a single isolated flux-biased superconducting ring | We describe measurements of the thermally-activated transitions between
fluxoid states of a single isolated superconducting ring. We compare these
measurements with theoretical predictions in which all of the relevant
parameters are determined via independent characterization of the same ring.
This no-free-parameters c... | 1910.12296v3 |
2019-10-28 | Reply to Comment on "A no-go result for the quantum damped harmonic oscillator" | In a recent paper, \cite{deguchi}, Deguchi and Fujiwara claim that our
results in \cite{BGR} are wrong, and compute what they claim is the square
integrable vacuum of their annihilation operators. In this brief note, we show
that their vacuum is indeed not a vacuum, and we try to explain what is behind
their mistake. W... | 1910.12561v1 |
2019-11-30 | Robustness Evaluation of the Butterfly Optimization Algorithm on a Control System | In this paper, the Butterfly Optimization Algorithm (BOA) proposed by [1] is
adopted to optimize the parameters of a designed Lead-Lad Controller so as to
obtain a stabilized control system. Numerical analysis was carried out for BOA
on the control problem and the results are compared to those obtained from the
well kn... | 1912.00185v1 |
2019-12-05 | Blow up for small-amplitude semilinear wave equations with mixed nonlinearities on asymptotically Euclidean manifolds | In this work, we investigate the problem of finite time blow up as well as
the upper bound estimates of lifespan for solutions to small-amplitude
semilinear wave equations with mixed nonlinearities $a |u_t|^p+b |u|^q$, posed
on asymptotically Euclidean manifolds, which is related to both the Strauss
conjecture and Glas... | 1912.02561v1 |
2019-12-13 | On an existence theory for a fluid-beam problem encompassing possible contacts | In this paper we consider a coupled system of pdes modelling the interaction
between a two--dimensional incompressible viscous fluid and a one--dimensional
elastic beam located on the upper part of the fluid domain boundary. We design
a functional framework to define weak solutions in case of contact between the
elasti... | 1912.06396v1 |
2019-12-16 | Performance and error modeling of Deutsch's algorithm in IBM Q | The performance of quantum computers today can be studied by analyzing the
effect of errors in the result of simple quantum algorithms. The modeling and
characterization of these errors is relevant to correct them, for example, with
quantum correcting codes. In this article we characterize the error of the five
qubits ... | 1912.07486v1 |
2019-12-17 | Global cosmic string networks as a function of tension | We investigate the properties of global cosmic string networks as a function
of the ratio of string tension to Goldstone-field coupling, and as a function
of the Hubble damping strength. Our results show unambiguously that the string
density is sensitive to this ratio. We also find that existing semi-analytical
(one-sc... | 1912.08058v2 |
2019-12-20 | Exact Model Reduction and Fast Forced Response Calculation in High-Dimensional Nonlinear Mechanical Systems | We show how spectral submanifold (SSM) theory can be used to extract
forced-response curves, including isolas, without any numerical simulation in
high-degree-of-freedom, periodically forced mechanical systems. We use
multivariate recurrence relations to construct the SSMs, achieving a major
speed-up relative to earlie... | 1912.11399v1 |
2019-12-24 | Enstrophy dissipation and vortex thinning for the incompressible 2D Navier-Stokes equations | By direct numerical simulation to the two-dimensional Navier-Stokes equations
with small-scale forcing and large-scale damping, Xiao-Wan-Chen-Eyink (2009)
found an evidence that inverse energy cascade may proceed with the vortex
thinning mechanism. On the other hand, Alexakis-Doering (2006) calculated upper
bound of th... | 1912.11479v2 |
2019-12-26 | Bifurcation analysis of a density oscillator using two-dimensional hydrodynamic simulation | A density oscillator exhibits limit-cycle oscillations driven by the density
difference of the two fluids. We performed two-dimensional hydrodynamic
simulations with a simple model, and reproduced the oscillatory flow observed
in experiments. As the density difference is increased as a bifurcation
parameter, a damped o... | 1912.11806v2 |
2019-12-31 | Neutrino evolution and quantum decoherence | Neutrino interactions with an external environment can in influence the
neutrino oscillation pattern and the oscillations can be damped as a result of
the neutrino quantum decoherence. In particular, the quantum decoherence of
neutrino states engendered by the neutrino radiative decay accounting for the
nonstandard int... | 1912.13311v1 |
2020-03-02 | Optimal transport: discretization and algorithms | This chapter describes techniques for the numerical resolution of optimal
transport problems. We will consider several discretizations of these problems,
and we will put a strong focus on the mathematical analysis of the algorithms
to solve the discretized problems. We will describe in detail the following
discretizati... | 2003.00855v1 |
2020-03-03 | Preconditioning mixed finite elements for tide models | We describe a fully discrete mixed finite element method for the linearized
rotating shallow water model, possibly with damping. While Crank-Nicolson
time-stepping conserves energy in the absence of drag or forcing terms and is
not subject to a CFL-like stability condition, it requires the inversion of a
linear system ... | 2003.01632v1 |
2020-03-12 | Geometry-aware Dynamic Movement Primitives | In many robot control problems, factors such as stiffness and damping
matrices and manipulability ellipsoids are naturally represented as symmetric
positive definite (SPD) matrices, which capture the specific geometric
characteristics of those factors. Typical learned skill models such as dynamic
movement primitives (D... | 2003.06061v1 |
2020-03-16 | Extreme Hawking Radiation | Modeling the collapse of an extreme Reissner-Nordstr\"om (ERN) black hole by
solving the corresponding moving mirror model for the trajectory that
asymptotically approaches uniform acceleration, we obtain the non-zero beta
coefficients for all times. Finite energy is emitted, the radiation spectra is
non-thermal (non-s... | 2003.07016v1 |
2020-03-23 | Mixed boundary valued problem for linear and nonlinear wave equations in domains with fractal boundaries | The weak well-posedness, with the mixed boundary conditions, of the strongly
damped linear wave equation and of the non linear Westervelt equation is proved
in the largest natural class of Sobolev admissible non-smooth domains. In the
framework of uniform domains in R^2 or R^3 we also validate the approximation
of the ... | 2003.10134v2 |
2020-08-02 | Partially Coherent Direct Sum Channels | We introduce Partially Coherent Direct Sum (PCDS) quantum channels, as a
generalization of the already known Direct Sum quantum channels. We derive
necessary and sufficient conditions to identify the subset of those maps which
are degradable, and provide a simplified expression for their quantum
capacities. Interesting... | 2008.00494v4 |
2020-08-05 | Time scales in the thermal dynamics of magnetic dipolar clusters | The collective behavior of thermally active structures offers clues on the
emergent degrees of freedom and the physical mechanisms that determine the low
energy state of a variety of systems. Here, the thermally active dynamics of
magnetic dipoles at square plaquettes is modeled in terms of Brownian
oscillators in cont... | 2008.01891v2 |
2020-08-06 | Plasmonic nonreciprocity driven by band hybridization in moiré materials | We propose a new current-driven mechanism for achieving significant plasmon
dispersion nonreciprocity in systems with narrow, strongly hybridized electron
bands. The magnitude of the effect is controlled by the strength of
electron-electron interactions $\alpha$, which leads to its particular
prominence in moir\'e mate... | 2008.02804v1 |
2022-01-12 | Light and microwave driven spin pumping across FeGaB-BiSb interface | 3-D topological insulators (TI) with large spin Hall conductivity have
emerged as potential candidates for spintronic applications. Here, we report
spin to charge conversion in bilayers of amorphous ferromagnet (FM)
Fe_{78}Ga_{13}B_{9} (FeGaB) and 3-D TI Bi_{85}Sb_{15} (BiSb) activated by two
complementary techniques: ... | 2201.04686v1 |
2024-03-21 | Picotesla-sensitivity microcavity optomechanical magnetometry | Cavity optomechanical systems have enabled precision sensing of magnetic
fields, by leveraging the optical resonance-enhanced readout and mechanical
resonance-enhanced response. Previous studies have successfully achieved
scalable and reproducible microcavity optomechanical magnetometry (MCOM) by
incorporating Terfenol... | 2403.14301v1 |
2015-08-28 | Control of magnetic relaxation by electric-field-induced ferroelectric phase transition and inhomogeneous domain switching | Electric-field modulation of magnetism in strain-mediated multiferroic
heterostructures is considered a promising scheme for enabling memory and
magnetic microwave devices with ultralow power consumption. However, it is not
well understood how electric-field-induced strain influences magnetic
relaxation, an important p... | 1508.07290v2 |
2022-01-11 | Resonant Precession of Magnetization and Precession -- Induced DC voltages in FeGaB Thin Films | Measurements of frequency dependent ferromagnetic resonance (FMR) and spin
pumping driven dc voltage (V_{dc}) are reported for amorphous films of
Fe_{78}Ga_{13}B_{9} (FeGaB) alloy to address the phenomenon of self-induced
inverse spin Hall effect (ISHE) in plain films of metallic ferromagnets. The
V_{dc} signal, which ... | 2201.03739v1 |
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 |
2021-12-10 | Enhanced Planar Antenna Efficiency Through Magnetic Thin-Films | This work proposes to use magnetic material as the substrate of planar
antennas to overcome the platform effect caused by the conducting ground plane.
The upper bound of the radiation efficiency of an electric-current-driven
low-profile antenna is theoretically derived, which is inversely proportional
to the Gilbert da... | 2201.04932v1 |
2017-09-29 | Non-local Gilbert damping tensor within the torque-torque correlation model | An essential property of magnetic devices is the relaxation rate in magnetic
switching which depends strongly on the damping in the magnetisation dynamics.
It was recently measured that damping depends on the magnetic texture and,
consequently, is a non-local quantity. The damping enters the
Landau-Lifshitz-Gilbert equ... | 1709.10365v1 |
2016-02-23 | Experimental Investigation of Temperature-Dependent Gilbert Damping in Permalloy Thin Films | The Gilbert damping of ferromagnetic materials is arguably the most important
but least understood phenomenological parameter that dictates real-time
magnetization dynamics. Understanding the physical origin of the Gilbert
damping is highly relevant to developing future fast switching spintronics
devices such as magnet... | 1602.07325v1 |
2019-02-22 | Strongly Enhanced Gilbert Damping in 3d Transition Metal Ferromagnet Monolayers in Contact with Topological Insulator Bi2Se3 | Engineering Gilbert damping of ferromagnetic metal films is of great
importance to exploit and design spintronic devices that are operated with an
ultrahigh speed. Based on scattering theory of Gilbert damping, we extend the
torque method originally used in studies of magnetocrystalline anisotropy to
theoretically dete... | 1902.08700v1 |
2018-08-20 | Gilbert damping of [Co/Pd]n/Py multilayer thin films | Understanding the Gilbert damping in exchange-coupled multilayer materials is
particularly important to develop future fast switching spintronics devices.
Here, we report an experimental investigation of temperature-dependent Gilbert
damping in [Co/Pd]n/Py multilayer films of varying the number of Co/Pd
repetitions by ... | 1808.06515v2 |
2007-08-24 | Enhancement of the Gilbert damping constant due to spin pumping in noncollinear ferromagnet/nonmagnet/ferromagnet trilayer systems | We analyzed the enhancement of the Gilbert damping constant due to spin
pumping in non-collinear ferromagnet / non-magnet / ferromagnet trilayer
systems. We show that the Gilbert damping constant depends both on the
precession angle of the magnetization of the free layer and on the direction of
the magntization of the ... | 0708.3323v1 |
2017-06-14 | Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order | Half-metallicity and low magnetic damping are perpetually sought for in
spintronics materials and full Heusler alloys in this respect provide
outstanding properties. However, it is challenging to obtain the well-ordered
half-metallic phase in as-deposited full Heusler alloys thin films and theory
has struggled to estab... | 1706.04670v2 |
2023-11-27 | Gilbert damping in two-dimensional metallic anti-ferromagnets | A finite spin life-time of conduction electrons may dominate Gilbert damping
of two-dimensional metallic anti-ferromagnets or anti-ferromagnet/metal
heterostructures. We investigate the Gilbert damping tensor for a typical
low-energy model of a metallic anti-ferromagnet system with honeycomb magnetic
lattice and Rashba... | 2311.16268v2 |
2008-07-31 | Scattering Theory of Gilbert Damping | The magnetization dynamics of a single domain ferromagnet in contact with a
thermal bath is studied by scattering theory. We recover the
Landau-Liftshitz-Gilbert equation and express the effective fields and Gilbert
damping tensor in terms of the scattering matrix. Dissipation of magnetic
energy equals energy current p... | 0807.5009v1 |
2024-01-18 | Real-space nonlocal Gilbert damping from exchange torque correlation applied to bulk ferromagnets and their surfaces | In this work we present an ab initio scheme based on linear response theory
of exchange torque correlation, implemented into the real-space
Korringa-Kohn-Rostoker (RS-KKR) framework to calculate diagonal elements of the
atomic-site-dependent intrinsic Gilbert damping tensor. The method is first
applied to bcc iron and ... | 2401.09938v2 |
2007-06-12 | Gilbert and Landau-Lifshitz damping in the presense of spin-torque | A recent article by Stiles et al. (cond-mat/0702020) argued in favor of the
Landau-Lifshitz damping term in the micromagnetic equations of motion over that
of the more commonly accepted Gilbert damping form. Much of their argument
revolved around spin-torque driven domain wall motion in narrow magnetic wires,
since the... | 0706.1736v1 |
2008-04-04 | Inhomogeneous Gilbert damping from impurities and electron-electron interactions | We present a unified theory of magnetic damping in itinerant electron
ferromagnets at order $q^2$ including electron-electron interactions and
disorder scattering. We show that the Gilbert damping coefficient can be
expressed in terms of the spin conductivity, leading to a Matthiessen-type
formula in which disorder and... | 0804.0820v2 |
2006-12-01 | Gilbert damping and spin Coulomb drag in a magnetized electron liquid with spin-orbit interaction | We present a microscopic calculation of the Gilbert damping constant for the
magnetization of a two-dimensional spin-polarized electron liquid in the
presence of intrinsic spin-orbit interaction. First we show that the Gilbert
constant can be expressed in terms of the auto-correlation function of the
spin-orbit induced... | 0612015v1 |
2021-01-07 | Mechanisms behind large Gilbert damping anisotropies | A method with which to calculate the Gilbert damping parameter from a
real-space electronic structure method is reported here. The anisotropy of the
Gilbert damping with respect to the magnetic moment direction and local
chemical environment is calculated for bulk and surfaces of Fe$_{50}$Co$_{50}$
alloys from first pr... | 2101.02794v2 |
2018-08-13 | Gilbert damping phenomenology for two-sublattice magnets | We present a systematic phenomenological description of Gilbert damping in
two-sublattice magnets. Our theory covers the full range of materials from
ferro- via ferri- to antiferromagnets. Following a Rayleigh dissipation
functional approach within a Lagrangian classical field formulation, the theory
captures intra- as... | 1808.04385v2 |
2021-07-02 | Anomalous Gilbert Damping and Duffing Features of the SFS {\boldmath $\varphi_0$} Josephson Junction | We demonstrate unusual features of phase dynamics, IV-characteristics and
magnetization dynamics of the $\varphi_0$ Josephson junction at small values of
spin-orbit interaction, ratio of Josephson to magnetic energy and Gilbert
damping. In particular, an anomalous shift of the ferromagnetic resonance
frequency with an ... | 2107.00982v3 |
2023-03-07 | Electrically tunable Gilbert damping in van der Waals heterostructures of two-dimensional ferromagnetic metals and ferroelectrics | Tuning the Gilbert damping of ferromagnetic (FM) metals via a nonvolatile way
is of importance to exploit and design next-generation novel spintronic
devices. Through systematical first-principles calculations, we study the
magnetic properties of the van der Waals heterostructure of two-dimensional FM
metal CrTe2 and f... | 2303.03852v1 |
2015-08-28 | The inviscid limit for the Landau-Lifshitz-Gilbert equation in the critical Besov space | We prove that in dimensions three and higher the Landau-Lifshitz- Gilbert
equation with small initial data in the critical Besov space is globally
wellposed in a uniform way with respect to the Gilbert damping parameter. Then
we show that the global solution converges to that of the Schrodinger maps in
the natural spa... | 1508.07118v3 |
2023-09-20 | Evaluating Gilbert Damping in Magnetic Insulators from First Principles | Magnetic damping has a significant impact on the performance of various
magnetic and spintronic devices, making it a long-standing focus of research.
The strength of magnetic damping is usually quantified by the Gilbert damping
constant in the Landau-Lifshitz-Gilbert equation. Here we propose a
first-principles based a... | 2309.11152v1 |
2019-06-25 | Conductivity-Like Gilbert Damping due to Intraband Scattering in Epitaxial Iron | Confirming the origin of Gilbert damping by experiment has remained a
challenge for many decades, even for simple ferromagnetic metals. In this
Letter, we experimentally identify Gilbert damping that increases with
decreasing electronic scattering in epitaxial thin films of pure Fe. This
observation of conductivity-lik... | 1906.10326v2 |
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