publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2013-09-21 | Patterns formation in axially symmetric Landau-Lifshitz-Gilbert-Slonczewski equations | The Landau-Lifshitz-Gilbert-Slonczewski equation describes magnetization
dynamics in the presence of an applied field and a spin polarized current. In
the case of axial symmetry and with focus on one space dimension, we
investigate the emergence of space-time patterns in the form of wavetrains and
coherent structures, ... | 1309.5523v4 |
2013-10-09 | Symmetry Analysis in Linear Hydrodynamic Stability Theory: Classical and New Modes in Linear Shear | We present a symmetry classification of the linearised Navier-Stokes
equations for a two-dimensional unbounded linear shear flow of an
incompressible fluid. The full set of symmetries is employed to systematically
derive invariant ansatz functions. The symmetry analysis grasps three
approaches. Two of them are existing... | 1310.2650v1 |
2013-10-23 | Spectroscopic investigation of local mechanical impedance of living cells | The mechanical properties of PC12 living cells have been studied at the
nanoscale with a Force Feedback Microscope using two experimental approaches.
Firstly, the local mechanical impedance of the cell membrane has been mapped
simultaneously to the cell morphology at constant force. As the force of the
interaction is g... | 1310.6201v1 |
2013-10-23 | Using an artificial electric field to create the analog of the red spot of Jupiter in light-heavy Fermi-Fermi mixtures of ultracold atoms | Time-of-flight images are a common tool in ultracold atomic experiments,
employed to determine the quasimomentum distribution of the interacting
particles. If one introduces a constant artificial electric field, then the
quasimomentum distribution evolves in time as Bloch oscillations are generated
in the system and th... | 1310.6350v1 |
2013-11-21 | Note on the super inflation in loop quantum cosmology | Phenomenological effect of the super-inflation in loop quantum cosmology
(LQC) is discussed. We investigate the case that the Universe is filled with
the interacting field between massive scalar field and radiation. Considering
the damping coefficient $\Gamma$ as a constant, the changes of the scale factor
during super... | 1311.5325v1 |
2013-12-10 | Delaying the waterfall transition in warm hybrid inflation | We analyze the dynamics and observational predictions of supersymmetric
hybrid inflation in the warm regime, where dissipative effects are mediated by
the waterfall fields and their subsequent decay into light degrees of freedom.
This produces a quasi-thermal radiation bath with a slowly-varying temperature
during infl... | 1312.2961v1 |
2013-12-11 | Modelling of the optical properties of silver with use of six fitting parameters | We propose a realistic model of the optical properties of silver, in which
inter-band transition with a threshold energy of ~ 4 eV is described
phenomenologically by an ensemble of oscillators with same damping constant and
a certain distribution of resonant frequencies in the interband transition
threshold to infinity... | 1312.3100v1 |
2014-02-13 | Tailoring optical fields emitted by nanometric sources | Here we study a simple way of controlling the emitted fields of
sub-wavelength nanometric sources. The system consists of arrays of
nanoparticles (NPs) embedded in optical active media. The key concept is the
careful tuning of NP's damping factors, which changes the eigenmode's decay
rates of the whole array. This, at ... | 1402.3184v1 |
2014-02-25 | Kinetic theory for a mobile impurity in a degenerate Tonks-Girardeau gas | A kinetic theory describing the motion of an impurity particle in a
degenerate Tonks-Girardeau gas is presented. The theory is based on the
one-dimensional Boltzmann equation. An iterative procedure for solving this
equation is proposed, leading to the exact solution in number of special cases
and to an approximate sol... | 1402.6362v2 |
2014-02-28 | Probing the critical behavior in the evolution of GDR width at very low temperatures in A~100 mass region | The influence of giant dipole resonance (GDR) induced quadrupole moment on
GDR width at low temperatures is investigated experimentally by measuring GDR
width systematically in the unexplored temperature range $T$=0.8-1.5 MeV, for
the first time, in $A$ $\sim$ 100 mass region. The measured GDR widths, using
alpha induc... | 1402.7210v1 |
2014-03-19 | Kinetic description of wave induced plasma flow in the radio frequency domain | A model for ICRH induced flows in the presence of a strong magnetic field is
presented. These flows are the finite temperature counterpart of flows existing
in cold plasmas described e.g. in [D. Van Eester et al., Plasma Phys. Control.
Fusion 55 (2013) 025002] and thus do not rely on the waves being damped. The
kinetic... | 1403.4770v1 |
2014-04-04 | Irreversible Thermodynamics of the Universe: Constraints from Planck Data | The present work deals with irreversible Universal thermodynamics. The
homogenous and isotropic flat model of the universe is chosen as open
thermodynamical system and non-equilibrium thermodynamics comes into picture
due to the mechanism of particle creation. For simplicity, entropy flow is
considered only due to heat... | 1404.1220v1 |
2014-04-18 | Transport Properties of Dirac Ferromagnet | We propose a model ferromagnet based on the Dirac Hamiltonian in three
spatial dimensions, and study its transport properties which include
anisotropic magnetoresistance (AMR) and anomalous Hall (AH) effect. This
relativistic extension allows two kinds of ferromagnetic order parameters,
denoted by $\bm{M}$ and $\bm{S}$... | 1404.4741v2 |
2014-05-21 | Spectroscopy of Rindler Modified Schwarzschild Black Hole | We study quasinormal modes (QNMs) of uncharged Grumiller black hole (GBH).
This massive BH has a Rindler acceleration $a$, and hence it is also called
Rindler modified Schwarzschild BH. After reducing the radial equation of the
massless Klein-Gordon equation to the Zerilli equation, we compute the complex
frequencies o... | 1405.5388v1 |
2014-08-08 | Ambipolar diffusion in smoothed particle magnetohydrodynamics | In partially ionised plasmas, the magnetic field can become decoupled from
the neutral gas and diffuse through it in a process known as ambipolar
diffusion. Although ambipolar diffusion has been implemented in several grid
codes, we here provide an implementation in smoothed particle
magnetohydrodynamics (SPMHD). We us... | 1408.1807v1 |
2014-10-05 | Finite-time stabilization of a network of strings | We investigate the finite-time stabilization of a tree-shaped network of
strings. Transparent boundary conditions are applied at all the external nodes.
At any internal node, in addition to the usual continuity conditions, a
modified Kirchhoff law incorporating a damping term $\alpha u_t$ with a
coefficient $\alpha$ th... | 1410.1122v1 |
2014-10-22 | Spin current generation from sputtered Y3Fe5O12 films | Spin current injection from sputtered yttrium iron garnet (YIG) films into an
adjacent platinum layer has been investigated by means of the spin pumping and
the spin Seebeck effects. Films with a thickness of 83 and 96 nanometers were
fabricated by on-axis magnetron rf sputtering at room temperature and
subsequent post... | 1410.5987v1 |
2014-11-03 | Experimental Demonstration of the Co-existence of the Spin Hall and Rashba Effects in beta-Tantalum/Ferromagnet Bilayers | We have measured the spin torques of beta-Tantalum / Co20Fe60B20 bilayers
versus Ta thickness at room temperature using an FMR technique. The spin Hall
coefficient was calculated both from the observed change in damping coefficient
of the ferromagnet with Ta thickness, and from the ratio of the symmetric and
anti-symme... | 1411.0601v1 |
2014-12-01 | Dissipation due to pure spin-current generated by spin pumping | Based on spin-dependent transport theory and thermodynamics, we develop a
generalized theory of the Joule heating in the presence of a spin current.
Along with the conventional Joule heating consisting of an electric current and
electrochemical potential, it is found that the spin current and spin
accumulation give an ... | 1412.0688v1 |
2014-12-08 | Higgs mode in the quench dynamics of a confined ultracold Fermi gas in the BCS regime | The Higgs amplitude mode of the order parameter of an ultracold confined
Fermi gas in the BCS regime after a quench of the coupling constant is analyzed
theoretically. Characteristic features are a damped oscillation which at a
certain transition time changes into a rather irregular dynamics. We compare
the numerical s... | 1412.2591v1 |
2014-12-16 | Dynamics of reversals and condensates in 2D Kolmogorov flows | We present direct numerical simulations of the different two-dimensional flow
regimes generated by a constant spatially periodic forcing balanced by viscous
dissipation and large scale drag with a dimensionless damping rate $1/Rh$. The
linear response to the forcing is a $6\times6$ square array of counter-rotating
vort... | 1412.4959v1 |
2015-01-14 | Predissociation dynamics of lithium iodide | The predissociation dynamics of lithium iodide (LiI) in the first excited
A-state is investigated for molecules in the gas phase and embedded in helium
nanodroplets, using femtosecond pump-probe photoionization spectroscopy. In the
gas phase, the transient Li+ and LiI+ ion signals feature damped oscillations
due to the... | 1501.03327v1 |
2015-01-15 | Dynamics and performance of clock pendulums | We analyze the dynamics of a driven, damped pendulum as used in mechanical
clocks. We derive equations for the amplitude and phase of the oscillation, on
time scales longer than the pendulum period. The equations are first order ODEs
and permit fast simulations of the joint effects of circular and escapement
errors, fr... | 1501.03673v1 |
2015-01-21 | Controllable chaotic dynamics in a nonlinear fiber ring resonators with balanced gain and loss | We show the possibility of controlling the dynamical behavior of a single
fiber ring (SFR) resonator system with the fiber being an amplified (gain)
channel and the ring being attenuated (loss) nonlinear dielectric medium. Our
model is based on the simple alterations in the parity time symmetric synthetic
coupler struc... | 1501.05187v2 |
2015-01-30 | Head-to-Head Domain Wall Structures in Wide Permalloy Strips | We analyze the equilibrium micromagnetic domain wall structures encountered
in Permalloy strips of a wide range of thicknesses and widths, with strip
widths up to several micrometers. By performing an extensive set of
micromagnetic simulations, we show that the equilibrium phase diagram of the
domain wall structures ex... | 1501.07731v1 |
2015-03-19 | On the efficiency of heat engines at the micro-scale and below | We investigate the thermodynamic efficiency of sub-micro-scale heat engines
operating under the conditions described by over-damped stochastic
thermodynamics. We prove that at maximum power the efficiency obeys for
constant isotropic mobility the universal law $\eta=2\,\eta_{C}/(4-\eta_{C})$
where $\eta_{C}$ is the eff... | 1503.05788v2 |
2015-03-26 | Thermophoresis of an Antiferromagnetic Soliton | We study dynamics of an antiferromagnetic soliton under a temperature
gradient. To this end, we start by phenomenologically constructing the
stochastic Landau-Lifshitz-Gilbert equation for an antiferromagnet with the aid
of the fluctuation-dissipation theorem. We then derive the Langevin equation
for the soliton's cent... | 1503.07854v2 |
2015-04-09 | Thinning and thickening in active microrheology | When pulling a probe particle in a many-particle system with fixed velocity,
the probe's effective friction, defined as average pulling force over its
velocity, $\gamma_{eff}:=\langle F_{ex}\rangle/u$, first keeps constant (linear
response), then decreases (thinning) and finally increases (thickening). We
propose a thr... | 1504.02277v1 |
2015-06-09 | Sensitivity analysis for shape optimization of a focusing acoustic lens in lithotripsy | We are interested in shape sensitivity analysis for an optimization problem
arising in medical applications of high intensity focused ultrasound. The goal
is to find the optimal shape of a focusing acoustic lens so that the desired
acoustic pressure at a kidney stone is achieved. Coupling of the silicone
acoustic lens ... | 1506.02781v1 |
2015-06-27 | The Quasi-normal Modes of Charged Scalar Fields in Kerr-Newman black hole and Its Geometric Interpretation | It is well-known that there is a geometric correspondence between
high-frequency quasi-normal modes (QNMs) and null geodesics (spherical photon
orbits). In this paper, we generalize such correspondence to charged scalar
field in Kerr-Newman space-time. In our case, the particle and black hole are
all charged, so one sh... | 1506.08276v2 |
2015-07-05 | Representation of the Fourier transform as a weighted sum of the complex error functions | In this paper we show that a methodology based on a sampling with the
Gaussian function of kind $h\,{e^{ - {{\left( {t/c} \right)}^2}}}/\left(
{{c}\sqrt \pi } \right)$, where ${c}$ and $h$ are some constants, leads to the
Fourier transform that can be represented as a weighted sum of the complex
error functions. Due to... | 1507.01241v3 |
2015-07-17 | Oscillatory Growth: A Phenomenological View | In this communication, the approach of phenomenological universalities of
growth are considered to describe the behaviour of a system showing oscillatory
growth. Two phenomenological classes are proposed to consider the behaviour of
a system in which oscillation of a property may be observed. One of them is
showing osc... | 1507.04833v1 |
2015-07-29 | Gravitational, shear and matter waves in Kantowski-Sachs cosmologies | A general treatment of vorticity-free, perfect fluid perturbations of
Kantowski-Sachs models with a positive cosmological constant are considered
within the framework of the 1+1+2 covariant decomposition of spacetime. The
dynamics is encompassed in six evolution equations for six harmonic
coefficients, describing gravi... | 1507.08300v2 |
2015-08-04 | Scalar Perturbations of two-dimensional Horava-Lifshitz Black Holes | In this article, we study the stability of black hole solutions found in the
context of dilatonic Horava-Lifshitz gravity in $1+1$ dimensions by means of
the quasinormal modes approach. In order to find the corresponding quasinormal
modes, we consider the perturbations of massive and massless scalar fields
minimally co... | 1508.00650v2 |
2015-09-16 | Outgoing electromagnetic power induced from pair plasma falling into a rotating black hole | We examine energy conversion from accreting pair plasma to outgoing Poynting
flux by black hole rotation. Our approach is based on a two-fluid model
consisting of collisionless pair plasma. The electric potential is not constant
along magnetic field lines, unlike an ideal magnetohydrodynamics approximation.
We show how... | 1509.04793v1 |
2015-09-16 | Hydrodynamics, resurgence and trans-asymptotics | The second-order hydrodynamical description of a homogeneous conformal plasma
that undergoes a boost- invariant expansion is given by a single nonlinear
ordinary differential equation, whose resurgent asymptotic properties we study,
developing further the recent work of Heller and Spalinski [Phys. Rev. Lett.
115, 07250... | 1509.05046v1 |
2015-10-30 | Anisotropic characteristics of the Kraichnan direct cascade in two-dimensional hydrodynamic turbulence | Statistical characteristics of the Kraichnan direct cascade for
two-dimensional hydrodynamic turbulence are numerically studied (with spatial
resolution $8192\times 8192$) in the presence of pumping and viscous-like
damping. It is shown that quasi-shocks of vorticity and their Fourier
partnerships in the form of jets i... | 1510.09052v1 |
2015-11-10 | On the global solution of 3-D MHD system with initial data near equilibrium | In this paper, we prove the global existence of smooth solutions to the
three-dimensional incompressible magneto-hydrodynamical system with initial
data close enough to the equilibrium state, $(e_3,0).$ Compared with the the
previous works \cite{XLZMHD1, XZ15}, here we present a new Lagrangian
formulation of the system... | 1511.02978v1 |
2016-01-10 | Interfacial Dzyaloshinskii-Moriya interaction, surface anisotropy energy,and spin pumping at spin orbit coupled Ir/Co interface | The interfacial Dzyaloshinskii-Moriya interaction (iDMI), surface anisotropy
energy, and spin pumping at the Ir/Co interface are experimentally investigated
by performing Brillouin light scattering. Contrary to previous reports, we
suggest that the sign of the iDMI at the Ir/Co interface is the same as in the
case of t... | 1601.02210v3 |
2016-01-16 | Spin-orbit torque in Cr/CoFeAl/MgO and Ru/CoFeAl/MgO epitaxial magnetic heterostructures | We study the spin-orbit torque (SOT) effective fields in Cr/CoFeAl/MgO and
Ru/CoFeAl/MgO magnetic heterostructures using the adiabatic harmonic Hall
measurement. High-quality perpendicular-magnetic-anisotropy CoFeAl layers were
grown on Cr and Ru layers. The magnitudes of the SOT effective fields were
found to signific... | 1601.04164v1 |
2016-01-31 | Role of epistasis on the fixation probability of a non-mutator in an adapted asexual population | The mutation rate of a well adapted population is prone to reduction so as to
have a lower mutational load. We aim to understand the role of epistatic
interactions between the fitness affecting mutations in this process. Using a
multitype branching process, the fixation probability of a single non-mutator
emerging in a... | 1602.00282v2 |
2016-02-21 | Global Finite-Time Attitude Tracking via Quaternion Feedback | This paper addresses the attitude tracking of a rigid body using a quaternion
description. Global finite-time attitude controllers are designed with three
types of measurements, namely, full states, attitude plus constant-biased
angular velocity, and attitude only. In all three scenarios hybrid control
techniques are u... | 1602.06492v3 |
2016-04-12 | Quasinormal modes and a new instability of Einstein-Gauss-Bonnet black holes in the de Sitter world | Analysis of time-domain profiles for gravitational perturbations shows that
Gauss-Bonnet black holes in a de Sitter world possess a new kind of dynamical
instability which does not take place for asymptotically flat
Einstein-Gauss-Bonnet black holes. The new instability is in the gravitational
perturbations of the scal... | 1604.03604v2 |
2016-04-29 | Friedmann dynamics recovered from compactified Einstein-Gauss-Bonnet cosmology | In this paper cosmological dynamics in Einstein-Gauss-Bonnet gravity with a
perfect fluid source in arbitrary dimension is studied. A systematic analysis
is performed for the case that the theory does not admit maximally symmetric
solutions. Considering two independent scale factors, namely one for the three
dimensiona... | 1605.00041v1 |
2016-05-05 | Pulse excitation to continuous-wave excitation in a low-dimensional interacting quantum system | Real-time dynamics in one-dimensional transverse Ising model coupled with the
time-dependent oscillating field is analyzed by using the infinite
time-evolving block decimation algorithm and the Floquet theory. In particular,
the transient dynamics induced by the pulse field and their connections to the
dynamics by a co... | 1605.01537v1 |
2016-06-20 | Electronic friction near metal surfaces: a case where molecule-metal couplings depend on nuclear coordinates | We derive an explicit form for the electronic friction as felt by a molecule
near a metal surface for the general case that molecule-metal couplings depend
on nuclear coordinates. Our work generalizes a previous study by von Oppen et
al [Beilstein Journal of Nanotechnology, 3, 144, 2012], where we now go beyond
the Con... | 1606.06110v1 |
2016-07-13 | Inductive intrinsic localized modes in a 1D nonlinear electric transmission line | The experimental properties of intrinsic localized modes (ILM) have long been
compared with theoretical dynamical lattice models that make use of nonlinear
onsite and/or nearest neighbor intersite potentials. Here it is shown for a 1-D
lumped electrical transmission line a nonlinear inductive component in an
otherwise ... | 1607.03962v1 |
2016-08-10 | Glassy Dynamics of Brownian Particles with Velocity-Dependent Friction | We consider a two-dimensional model system of Brownian particles in which
slow particles are accelerated while fast particles are damped. The motion of
the individual particles are described by a Langevin equation with
Rayleigh-Helmholtz velocity dependent friction. In case of noninteracting
particles, the time evoluti... | 1608.03162v1 |
2016-09-05 | Coarsening dynamics of topological defects in thin Permalloy films | We study the dynamics of topological defects in the magnetic texture of
rectangular Permalloy thin film elements during relaxation from random
magnetization initial states. Our full micromagnetic simulations reveal complex
defect dynamics during relaxation towards the stable Landau closure domain
pattern, manifested as... | 1609.01094v1 |
2016-09-27 | Anomalous Feedback and Negative Domain Wall Resistance | Magnetic induction can be regarded as a negative feedback effect, where the
motive-force opposes the change of magnetic flux that generates the
motive-force. In artificial electromagnetics emerging from spintronics,
however, this is not necessarily the case. By studying the current-induced
domain wall dynamics in a cyl... | 1609.08250v1 |
2016-10-19 | Coupling of Damped and Growing Modes in Unstable Shear Flow | Analysis of the saturation of the Kelvin-Helmholtz (KH) instability is
undertaken to determine the extent to which the conjugate linearly stable mode
plays a role. For a piecewise-continuous mean flow profile with constant shear
in a fixed layer, it is shown that the stable mode is nonlinearly excited,
providing an inj... | 1610.06142v4 |
2016-11-05 | Number of Wavevectors for Each Frequency in a Periodic Structure | Periodic structures have interesting acoustic and vibration properties making
them suitable for a wide variety of applications. In a periodic structure, the
number of frequencies for each wavevector depends on the degree of freedom of
the unit cell. In this paper, we investigate the number of wavevectors for each
frequ... | 1611.01677v1 |
2016-11-22 | On the symplectic covariance and interferences of time-frequency distributions | We study the covariance property of quadratic time-frequency distributions
with respect to the action of the extended symplectic group. We show how
covariance is related, and in fact in competition, with the possibility of
damping the interferences which arise due to the quadratic nature of the
distributions. We also s... | 1611.07442v1 |
2017-01-05 | Excitation and detection of short-waved spin waves in ultrathin Ta/CoFeB/MgO-layer system suitable for spin-orbit-torque magnonics | We report on the excitation and detection of short-waved spin waves with wave
vectors up to about $40\,\mathrm{rad}\,\mu\mathrm{m}^{-1}$ in spin-wave
waveguides made from ultrathin, in-plane magnetized Co$_{8}$Fe$_{72}$B$_{20}$
(CoFeB). The CoFeB is incorporated in a layer stack of Ta/CoFeB/Mgo, a layer
system featurin... | 1701.01399v1 |
2017-03-28 | Temperature dependent magnetic damping of yttrium iron garnet spheres | We investigate the temperature dependent microwave absorption spectrum of an
yttrium iron garnet sphere as a function of temperature (5 K to 300 K) and
frequency (3 GHz to 43.5 GHz). At temperatures above 100 K, the magnetic
resonance linewidth increases linearly with temperature and shows a
Gilbert-like linear frequen... | 1703.09444v2 |
2017-03-31 | Spin Seebeck effect in Y-type hexagonal ferrite thin films | Spin Seebeck effect (SSE) has been investigated in thin films of two
Y-hexagonal ferrites Ba$_2$Zn$_{2}$Fe$_{12}$O$_{22}$ (Zn2Y) and
Ba$_2$Co$_{2}$Fe$_{12}$O$_{22}$ (Co2Y) deposited by a spin-coating method on
SrTiO$_3$(111) substrate. The selected hexagonal ferrites are both
ferrimagnetic with similar magnetic moments... | 1703.10903v1 |
2017-04-05 | Superfluid Field response to Edge dislocation motion | We study the dynamic response of a superfluid field to a moving edge
dislocation line to which the field is minimally coupled. We use a dissipative
Gross-Pitaevskii equation, and determine the initial conditions by solving the
equilibrium version of the model. We consider the subsequent time evolution of
the field for ... | 1704.01600v1 |
2017-04-29 | Multiple steady states and the form of response functions to antigen in a model for the initiation of T cell activation | The aim of this paper is to study the qualitative behaviour predicted by a
mathematical model for the initial stage of T cell activation. The state
variables in the model are the concentrations of phosphorylation states of the
T cell receptor complex and the phosphatase SHP-1 in the cell. It is shown that
these quantit... | 1705.00149v1 |
2017-05-12 | From an Action Principle for Action-dependent Lagrangians toward non-conservative Gravity: accelerating Universe without dark energy | In the present work, we propose an Action Principle for Action-dependent
Lagrangians by generalizing the Herglotz variational problem for several
independent variables. This Action Principle enables us to formulate Lagrangian
densities for non-conservative fields. In special, from a Lagrangian depending
linearly on the... | 1705.04604v1 |
2017-07-21 | Temperature dependence of nuclear fission time in heavy-ion fusion-fission reactions | Accounting for viscous damping within Fokker-Planck equations led to various
improvements in the understanding and analysis of nuclear fission of heavy
nuclei. Analytical expressions for the fission time are typically provided by
Kramers' theory, which improves on the Bohr-Wheeler estimate by including the
time-scale r... | 1707.06836v1 |
2017-09-18 | Stability of traveling, pre-tensioned, heavy cables | We study the dynamics of an inclined tensioned, heavy cable traveling with a
constant speed in the vertical plane. The cable is modeled as a beam resisting
bending and shear. The governing equation for the transverse in-plane
vibrations of the cable are derived through the Newton-Euler method. The cable
dynamics is als... | 1709.09516v1 |
2017-10-17 | New results on disturbance rejection for energy-shaping controlled port-Hamiltonian systems | In this paper we present a method to robustify energy-shaping controllers for
port-Hamiltonian (pH) systems by adding an integral action that rejects unknown
additive disturbances. The proposed controller preserves the pH structure and,
by adding to the new energy function a suitable cross term between the plant
and th... | 1710.06070v1 |
2017-11-15 | Probing Split-Ring Resonator Permeabilities with Loop-Gap Resonators | A method is proposed to experimentally determine the effective complex
permeability of split-ring resonator (SRR) arrays used in the design of
metamaterials at microwave frequencies. We analyze the microwave response of a
loop-gap resonator (LGR) whose bore has been partially loaded with one or more
SRRs. Our analysis ... | 1711.05819v1 |
2017-11-23 | Graphene multi-mode parametric oscillators | In the field of nanomechanics, parametric excitations are of interest since
they can greatly enhance sensing capabilities and eliminate cross-talk.
However, parametric excitations often rely on externally tuned springs, which
limits their application to high quality factor resonators and usually does not
allow excitati... | 1711.08798v1 |
2017-12-10 | Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets | The study of skyrmion/antiskyrmion motion in magnetic materials is very
important in particular for the spintronics applications. In this work, we
study the dynamics of isolated skyrmions and antiskyrmions in frustrated
magnets driven by magnetic field gradient, using the Landau-Lifshitz-Gilbert
simulations on the frus... | 1712.03550v1 |
2018-01-21 | Microwave fields driven domain wall motions in antiferromagnetic nanowires | In this work, we study the microwave field driven antiferromagnetic domain
wall motion in an antiferromagnetic nanowire, using the numerical calculations
based on a classical Heisenberg spin model. We show that a proper combination
of a static magnetic field plus an oscillating field perpendicular to the
nanowire axis ... | 1801.06748v1 |
2018-02-07 | Breaking the current density threshold in spin-orbit-torque magnetic random access memory | Spin-orbit-torque magnetic random access memory (SOT-MRAM) is a promising
technology for the next generation of data storage devices. The main bottleneck
of this technology is the high reversal current density threshold. This
outstanding problem of SOT-MRAM is now solved by using a current density of
constant magnitude... | 1802.02415v1 |
2018-02-20 | High-temperature structural phase transition and infrared dielectric features of La2CoMnO6 | Temperature-dependent FAR-infrared reflectivity spectra of partially ordered
magnetodielectric La2CoMnO6 is presented, from room temperature up to 675 K. A
clear first-ordered structural phase transition (SPT) from a monoclinic
structure with P2_1/n symmetry to a rhombohedral phase with R-3 symmetry was
evidenced from ... | 1802.07318v1 |
2018-03-26 | Force spectroscopy analysis in polymer translocation | This paper reports the force spectroscopy analysis of a polymer that
translocates from one side of a membrane to the other side through an extended
pore, pulled by a cantilever that moves with constant velocity against the
damping and the potential barrier generated by the reaction of the membrane
walls. The polymer is... | 1803.09798v2 |
2018-03-26 | Diffusive stability against nonlocalized perturbations of planar wave trains in reaction-diffusion systems | Planar wave trains are traveling wave solutions whose wave profiles are
periodic in one spatial direction and constant in the transverse direction. In
this paper, we investigate the stability of planar wave trains in
reaction-diffusion systems. We establish nonlinear diffusive stability against
perturbations that are b... | 1803.09812v2 |
2018-04-07 | Chemotaxis effect vs logistic damping on boundedness in the 2-D minimal Keller-Segel model | In this paper, we study chemotaxis effect vs logistic dampening on
boundedness for the two-dimensional minimal Keller-Segel model with logistic
source in a 2-D smooth and bounded domain. It is well-known that this model
allows only for global and uniform-in-time bounded solutions for any
chemotactic strength and logist... | 1804.02501v1 |
2018-04-18 | Large perpendicular magnetic anisotropy in epitaxial Fe/MgAl2O4(001) heterostructures | We investigated perpendicular magnetic anisotropy (PMA) and related
properties of epitaxial Fe (0.7 nm)/MgAl2O4(001) heterostructures prepared by
electron-beam evaporation. Using an optimized structure, we obtained a large
PMA energy ~1 MJ/m3 at room temperature, comparable to that in
ultrathin-Fe/MgO(001) heterostruct... | 1804.06526v2 |
2018-04-20 | Regular solutions to the fractional Euler alignment system in the Besov spaces framework | We here construct (large) local and small global-in-time regular unique
solutions to the fractional Euler alignment system in the whole space ${\mathbb
R}^d$, in the case where the deviation of the initial density from a constant
is sufficiently small. Our analysis strongly relies on the use of Besov spaces
of the type... | 1804.07611v2 |
2018-06-01 | Dirac-Surface-State Modulated Spin Dynamics in a Ferrimagnetic Insulator at Room Temperature | This work demonstrates dramatically modified spin dynamics of magnetic
insulator (MI) by the spin-momentum locked Dirac surface states of the adjacent
topological insulator (TI) which can be harnessed for spintronic applications.
As the Bi-concentration x is systematically tuned in 5 nm thick (BixSb1-x)2Te3
TI film, th... | 1806.00151v1 |
2018-06-27 | Non normal amplification of stochastic quasi-cycles | Stochastic quasi-cycles for a two species model of the excitatory-inhibitory
type, arranged on a triangular loop, are studied. By increasing the strength of
the inter-nodes coupling, one moves the system towards the Hopf bifurcation and
the amplitude of the stochastic oscillations are consequently magnified. When
the s... | 1806.10566v1 |
2018-08-15 | Collective excitations in two-component one-dimensional massless Dirac plasma | We study spectra of long wavelength plasma oscillations in a system of two
energy splitted one-dimensional (1D) massless Dirac fermion subbands coupled by
spin-orbit interaction. Such a system may be formed by edge subbands in
semiconducting transition metal dichalcogenide monolayers. Intrasubband
transitions of massle... | 1808.05180v1 |
2018-09-17 | On the speed of domain walls in thin nanotubes: the transition from the linear to the magnonic regime | Numerical simulations of domain wall propagation in thin nanotubes when an
external magnetic field is applied along the nanotube axis have shown an
unexpected behavior described as a transition from a linear to a magnonic
regime. As the applied magnetic field increases, the initial regime of linear
growth of the speed ... | 1809.06278v3 |
2018-10-04 | Effect of bunch shape on its TMCI spectrum and threshold with high space charge | Transverse mode coupling instability of bunched beam is investigated in the
paper at different form of the bunches with space charge included. Equation of
transverse motion of the bunch in parabolic potential well of synchrotron
oscillations is derived and analysed. The bunch of constant density (flat
bunch) is examine... | 1810.02458v4 |
2018-10-11 | Stability of scrape-off layer plasma: a modified Rayleigh-Benard problem | We present a linear stability analysis of a two-dimensional fluid model used
to study the plasma dynamics in the scrape-off layer of tokamaks. The model
equations are based on the Braginskii fluid equations under the assumptions of
drift ordering and an electrostatic plasma. The model also employs the common
slab geome... | 1810.05111v1 |
2018-10-30 | Role of acoustic phonons in exotic conductivity of two-dimensional Dirac electrons | We examine the effect of acoustic phonon scattering on the conductivity of
two-dimensional Dirac electrons. The temperature ($T$) dependence of the
conductivity ($\sigma$) is calculated using the electron Green's function with
damping by both the impurity ($\Gamma_0$) and phonon ($\Gamma_{\rm ph}$).For
zero or small do... | 1810.12875v1 |
2018-11-05 | Out of Time Ordered Quantum Dissipation | We consider a quantum Brownian particle interacting with two harmonic baths,
which is then perturbed by a cubic coupling linking the particle and the baths.
This cubic coupling induces non-linear dissipation and noise terms in the
influence functional/master equation of the particle. Its effect on the
Out-of-Time-Order... | 1811.01513v4 |
2018-12-03 | Microscopic theory of magnon-drag electron flow in ferromagnetic metals | A temperature gradient applied to a ferromagnetic metal induces not only
independent flows of electrons and magnons but also drag currents because of
their mutual interaction. In this paper, we present a microscopic study of the
electron flow induced by the drag due to magnons. The analysis is based on the
$s$-$d$ mode... | 1812.00720v1 |
2018-12-06 | Towards surface diffusion potential mapping on atomic length scale | The surface diffusion potential landscape plays an essential role in a number
of physical and chemical processes such as self-assembly and catalysis.
Diffusion energy barriers can be calculated theoretically for simple systems,
but there is currently no experimental technique to systematically measure them
on the relev... | 1812.02512v3 |
2019-01-01 | Gravitational Waves in the Presence of Viscosity | We analyze gravitational waves propagating in an isotropic cosmic fluid
endowed with a bulk viscosity $\zeta$ and a shear viscosity $\eta$, assuming
these coefficients to vary with fluid density $\rho$ as $\rho^\lambda$, with
$\lambda=1/2$ favored by experimental evidence. We give the general governing
equation for the... | 1901.00767v3 |
2019-01-17 | Spin transport parameters of NbN thin films characterised by spin pumping experiments | We present measurements of ferromagnetic-resonance - driven spin pumping and
inverse spin-Hall effect in NbN/Y3Fe5O12 (YIG) bilayers. A clear enhancement of
the (effective) Gilbert damping constant of the thin-film YIG was observed due
to the presence of the NbN spin sink. By varying the NbN thickness and
employing spi... | 1901.05753v1 |
2019-04-28 | Memory and mutualism in species sustainability: a time-fractional Lotka-Volterra model with harvesting | We first present a predator-prey model for two species and then extend the
model to three species where the two predator species engage in mutualistic
predation. Constant effort harvesting and the impact of by-catch issue are also
incorporated. Necessary sufficient conditions for the existence and stability
of positive... | 1904.12340v3 |
2019-05-29 | Prospects of reinforcement learning for the simultaneous damping of many mechanical modes | We apply adaptive feedback for the partial refrigeration of a mechanical
resonator, i.e. with the aim to simultaneously cool the classical thermal
motion of more than one vibrational degree of freedom. The feedback is obtained
from a neural network parametrized policy trained via a reinforcement learning
strategy to ch... | 1905.12344v2 |
2019-06-10 | An automatic dynamic balancer in a rotating mechanism with time-varying angular velocity | We consider the system of a two ball automatic dynamic balancer attached to a
rotating disc with nonconstant angular velocity. We directly compare the
scenario of constant angular velocity with that when the acceleration of the
rotor is taken into consideration. In doing so we show that there are cases
where one must t... | 1906.04823v1 |
2019-06-13 | Magnetoelasticity of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films | We investigate the magnetoelastic properties of
$\mathrm{Co_{25}}\mathrm{Fe_{75}}$ and $\mathrm{Co_{10}}\mathrm{Fe_{90}}$ thin
films by measuring the mechanical properties of a doubly clamped string
resonator covered with multi-layer stacks containing these films. For the
magnetostrictive constants we find
$\lambda_{\m... | 1906.05543v1 |
2019-07-25 | Model-independent constraints on the hydrogen-ionizing emissivity at z>6 | Modelling reionization often requires significant assumptions about the
properties of ionizing sources. Here, we infer the total output of
hydrogen-ionizing photons (the ionizing emissivity, $\dot{N}_\textrm{ion}$) at
$z=4-14$ from current reionization constraints, being maximally agnostic to the
properties of ionizing... | 1907.11332v1 |
2019-09-10 | Viscoelasticity-induced pulsatile motion of 2D roll cell in laminar wall-bounded shear flow | For the clarification of the routes to elasto-inertial turbulence (EIT), it
is essential to understand how viscoelasticity modulates coherent flow
structures including the longitudinal vortices. We focused on a rotating plane
Couette flow that provides two-dimensional (2D) roll cells for the steady
laminar Newtonian-fl... | 1909.04257v1 |
2019-09-16 | On spatial Gevrey regularity for some strongly dissipative second order evolution equations | Let A be a positive self-adjoint linear operator acting on a real Hilbert
space H and $\alpha$, c be positive constants. We show that all solutions of
the evolution equation u + Au + cA $\alpha$ u = 0 with u(0) $\in$ D(A 1 2), u
(0) $\in$ H belong for all t > 0 to the Gevrey space G(A, $\sigma$) with
$\sigma$ = min{ 1 ... | 1909.07067v1 |
2019-12-05 | Optomechanical cavity without a Stokes side-band | We investigate a theoretical demonstration of perfect frequency conversion in
an optomechanical system in the weak coupling regime without a Stokes
side-band. An optomechanical cavity illuminated by a weak probe field generates
two side-modes, differentiating from the original signal by a phonon frequency.
We report th... | 1912.02530v1 |
2019-12-11 | Uncertainty Principles Associated to Sets Satisfying the Geometric Control Condition | In this paper, we study forms of the uncertainty principle suggested by
problems in control theory. We obtain a version of the classical
Paneah-Logvinenko-Sereda theorem for the annulus. More precisely, we show that
a function with spectrum in an annulus of a given thickness can be bounded, in
$L^2$-norm, from above by... | 1912.05077v3 |
2020-01-04 | Observation of spin-motive force in ferrimagnetic GdFeCo alloy films | Non-uniform magnetic structures produce emergent electromagnetic phenomena
such as the topological Hall effect and the spin-motive force (SMF). The
experimental reports on the SMF, however, are very few and the relationship
between the SMF and material parameters is still unclear. In this study, we
investigated the SMF... | 2001.01042v2 |
2020-01-06 | Suppression of Oscillations in Two-Class Traffic by Full-State Feedback | This paper develops a full-state feedback controller that damps out
oscillations in traffic density and traffic velocity whose dynamical behavior
is governed by the linearized two-class Aw-Rascle (AR) model. Thereby, the
traffic is considered to be in the congested regime and subdivided in two
classes whereas each clas... | 2001.01504v1 |
2020-03-26 | Bipolar spin Hall nano-oscillators | We demonstrate a novel type of spin Hall nano-oscillator (SHNO) that allows
for efficient tuning of magnetic auto-oscillations over an extended range of
gigahertz frequencies, using bipolar direct currents at constant magnetic
fields. This is achieved by stacking two distinct ferromagnetic layers with a
platinum interl... | 2003.11776v1 |
2020-04-01 | Quasinormal modes of the Dirac field in the novel 4D Einstein-Gauss-Bonnet gravity | While quasinormal modes of bosonic fields for the non-trivial $4$-dimensional
Einstein-Gauss-Bonnet theory of gravity suggested in [D.~Glavan and C.~Lin,
Phys.\ Rev.\ Lett.\ {\bf 124}, 081301 (2020)] have been recently studied, there
is no such study for fermionic fields. Here we calculate quasinormal modes of
the Dira... | 2004.00513v2 |
2020-04-10 | Dirichlet boundary valued problems for linear and nonlinear wave equations on arbitrary and fractal domains | The weak well-posedness results of the strongly damped linear wave equation
and of the non linear Westervelt equation with homogeneous Dirichlet boundary
conditions are proved on arbitrary three dimensional domains or any two
dimensional domains which can be obtained by a limit of NTA domains
caractarized by the same g... | 2004.05055v1 |
2020-05-09 | Self-consistent T-matrix approach to gap renormalization in quantum magnets with bond disorder | Based on the self-consistent T-matrix approximation (SCTMA), analytical
theory of density of states (DOS) in three-dimensional quantum magnets with the
bond disorder is proposed. It successfully describes DOS in both cases of
resonant and non-resonant scattering which appearance is governed by the ratio
of scattering l... | 2005.04438v2 |
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