publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2000-08-03 | Kinetic Friction due to Ohm's Law Heating | Using both a recent calculation by Bruch of the damping of the motion of a
monolayer nitrogen film oscillating harmonically on a metallic surface due to
Ohm's law heating and a Thomas-Fermi approximation treatment of the Ohm's law
heating mechanism, which accounts for the nonzero thickness of the surface
region of a me... | 0008063v3 |
2001-11-07 | Study of Magnetic Excitation in Singlet-Ground-State Magnets CsFeCl$_3$ and RbFeCl$_3$ by Nuclear Magnetic Relaxation | The temperature dependences of spin-lattice relaxation time $T_1$ of
$^{133}$Cs in CsFeCl$_3$ and $^{87}$Rb in RbFeCl$_3$ were measured in the
temperature range between 1.5 K and 22 K, at various fields up to 7 T applied
parallel (or perpendicular) to the c-axis, and the analysis was made on the
basis of the DCEFA. The... | 0111097v2 |
2003-02-10 | The differential sum rule for the relaxation rate in dirty superconductors | We consider the differential sum rule for the effective scattering rate $%
1/\tau (\omega)$ and optical conductivity $\sigma_{1}(\omega) $ in a dirty BCS
superconductor, for arbitrary ratio of the superconducting gap $% \Delta$ and
the normal state constant damping rate $1/\tau$. We show that if $\tau$ is
independent o... | 0302191v1 |
2003-02-12 | Electronic-vibrational coupling in single-molecule devices | Experiments studying vibrational effects on electronic transport through
single molecules have observed several seemingly inconsistent behaviors,
ranging from up to 30 harmonics of a vibrational frequency in one experiment,
to an absence of higher-harmonic peaks in another. We study the different
manifestations of elec... | 0302222v2 |
2003-04-09 | Plastic Flow in Two-Dimensional Solids | A time-dependent Ginzburg-Landau model of plastic deformation in
two-dimensional solids is presented. The fundamental dynamic variables are the
displacement field $\bi u$ and the lattice velocity ${\bi v}=\p {\bi u}/\p t$.
Damping is assumed to arise from the shear viscosity in the momentum equation.
The elastic energy... | 0304209v1 |
2004-02-16 | Superconducting Qubits and the Physics of Josephson Junctions | We describe in this paper how the nonlinear Josephson inductance is the
crucial circuit element for all Josephson qubits. We discuss the three types of
qubit circuits, and show how these circuits use this nonlinearity in unique
manners. We give a brief derivation of the BCS theory, highlighting the
appearance of the ma... | 0402415v1 |
2004-04-24 | On the Modulational Instability of the Nonlinear Schrödinger Equation with Dissipation | The modulational instability of spatially uniform states in the nonlinear
Schr\"odinger equation is examined in the presence of higher-order dissipation.
The study is motivated by results on the effects of three-body recombination in
Bose-Einstein condensates, as well as by the important recent work of Segur et
al. on ... | 0404597v1 |
2005-01-04 | Local spectroscopy and atomic imaging of tunneling current, forces and dissipation on graphite | Theory predicts that the currents in scanning tunneling microscopy (STM) and
the attractive forces measured in atomic force microscopy (AFM) are directly
related. Atomic images obtained in an attractive AFM mode should therefore be
redundant because they should be \emph{similar} to STM. Here, we show that
while the dis... | 0501045v1 |
2005-03-01 | Discrete models of dislocations and their motion in cubic crystals | A discrete model describing defects in crystal lattices and having the
standard linear anisotropic elasticity as its continuum limit is proposed. The
main ingredients entering the model are the elastic stiffness constants of the
material and a dimensionless periodic function that restores the translation
invariance of ... | 0503020v1 |
2005-05-24 | Quasi-Elastic Scattering, Random Fields and phonon-coupling effects in PbMg1/3Nb2/3O3 | The low-energy part of the vibration spectrum in PbMg$_{1/3}$Nb$_{2/3}$O$_3$
(PMN) relaxor ferroelectric has been studied by neutron scattering above and
below the Burns temperature, T$_d$. The transverse acoustic and the lowest
transverse optic phonons are strongly coupled and we have obtained a model for
this couplin... | 0505584v1 |
2005-07-20 | All-optical probe of precessional magnetization dynamics in exchange biased NiFe/FeMn bilayers | An internal anisotropy pulse field is launched by an 8.3 ps short laser
excitation, which triggers precessional magnetization dynamics of a
polycrystalline NiFe/FeMn exchange bias system on the picosecond timescale. Due
to the excitation the unidirectional anisotropy and, thus, the exchange
coupling across the interfac... | 0507475v1 |
2005-12-26 | Spin waves in a band ferromagnet: spin-rotationally symmetric study with self-energy and vertex corrections | First-order quantum corrections to the transverse spin-fluctuation propagator
are obtained within a systematic inverse-degeneracy 1/N expansion, which
provides a spin-rotationally symmetric scheme for including self-energy and
vertex corrections while preserving the Goldstone mode. An expression is
obtained for the spi... | 0512648v2 |
2006-02-18 | Optical phonons in new ordered perovskite Sr2Cu(Re0.69Ca0.31) Oy system observed by infrared reflectance spectroscopy | We report infrared reflectivity spectra for a new correlated cupric oxide
system Sr2Cu(Re0.69Ca0.31)Oy with y ~ 0.6 at several temperatures ranging
between 8 and 380 K. The reflectivity spectrum at 300 K comprises of several
optical phonons. A couple of residual bands located around 315 and 653 cm-1
exhibit exceptional... | 0602438v1 |
2006-05-03 | Non equilibrium inertial dynamics of colloidal systems | We consider the properties of a one dimensional fluid of brownian inertial
hard-core particles, whose microscopic dynamics is partially damped by a
heat-bath. Direct interactions among the particles are represented as binary,
instantaneous elastic collisions. Collisions with the heath bath are accounted
for by a Fokker... | 0605094v1 |
2006-08-30 | Current-Driven Domain-Wall Dynamics in Curved Ferromagnetic Nanowires | The current-induced motion of a domain wall in a semicircle nanowire with
applied Zeeman field is investigated. Starting from a micromagnetic model we
derive an analytical solution which characterizes the domain-wall motion as a
harmonic oscillation. This solution relates the micromagnetic material
parameters with the ... | 0608680v1 |
2007-02-23 | Electronic viscosity in a quantum well: A test for the local density approximation | In the local density approximation (LDA) for electronic time-dependent
current-density functional theory (TDCDFT) many-body effects are described in
terms of the visco-elastic constants of the homogeneous three-dimensional
electron gas. In this paper we critically examine the applicability of the
three-dimensional LDA ... | 0702538v1 |
2007-02-28 | Bond Stiffening in Nanoclusters and its Consequences | We have used density functional perturbation theory to investigate the
stiffness of interatomic bonds in small clusters of Si, Sn and Pb. As the
number of atoms in a cluster is decreased, there is a marked shortening and
stiffening of bonds. The competing factors of fewer but stiffer bonds in
clusters result in softer ... | 0702677v1 |
2007-03-12 | Velocity dependence of friction and Kramers relaxation rates | We study the influence of the velocity dependence of friction on the escape
of a Brownian particle from the deep potential well ($E_{b} \gg k_{B}T$,
$E_{b}$ is the barrier height, $k_{B}$ is the Boltzmann constant, $T$ is the
bath temperature). The bath-induced relaxation is treated within the Rayleigh
model (a heavy p... | 0703312v1 |
1995-04-12 | STABLE CLOCKS AND GENERAL RELATIVITY | We survey the role of stable clocks in general relativity. Clock comparisons
have provided important tests of the Einstein Equivalence Principle, which
underlies metric gravity. These include tests of the isotropy of clock
comparisons (verification of local Lorentz invariance) and tests of the
homogeneity of clock comp... | 9504017v1 |
2000-11-18 | Third post-Newtonian dynamics of compact binaries: Noetherian conserved quantities and equivalence between the harmonic-coordinate and ADM-Hamiltonian formalisms | A Lagrangian from which derive the third post-Newtonian (3PN) equations of
motion of compact binaries (neglecting the radiation reaction damping) is
obtained. The 3PN equations of motion were computed previously by Blanchet and
Faye in harmonic coordinates. The Lagrangian depends on the harmonic-coordinate
positions, v... | 0011063v2 |
2006-10-06 | New Insights into Uniformly Accelerated Detector in a Quantum Field | We obtained an exact solution for a uniformly accelerated Unruh-DeWitt
detector interacting with a massless scalar field in (3+1) dimensions which
enables us to study the entire evolution of the total system, from the initial
transient to late-time steady state. We find that the Unruh effect as derived
from time-depend... | 0610024v1 |
1995-09-29 | Thermal Fermionic Dispersion Relations in a Magnetic Field | The thermal self-energy of an electron in a static uniform magnetic field $B$
is calculated to first order in the fine structure constant $\alpha $ and to
all orders in $eB$. We use two methods, one based on the Furry picture and
another based on Schwinger's proper-time method. As external states we consider
relativist... | 9509418v1 |
1999-12-22 | Chaotic inflation on the brane | We consider slow-roll inflation in the context of recently proposed
four-dimensional effective gravity induced on the world-volume of a three-brane
in five-dimensional Einstein gravity. We find significant modifications of the
simplest chaotic inflationary scenario when the five-dimensional Planck scale
is below about ... | 9912464v3 |
2003-07-05 | Hard Loops, Soft Loops, and High Density Effective Field Theory | We study several issues related to the use of effective field theories in QCD
at large baryon density. We show that the power counting is complicated by the
appearance of two scales inside loop integrals. Hard dense loops involve the
large scale $\mu^2$ and lead to phenomena such as screening and damping at the
scale $... | 0307074v1 |
2004-04-21 | Rho - Omega Splitting and Mixing in Nuclear Matter | We investigate the splitting and mixing of $\rho$ and $\omega$ mesons in
nuclear matter. The calculations were performed on the basis of QCD sum rules
and include all operators up to mass dimension-6 twist-4 and up to first order
in the coupling constants. Special attention is devoted to the impact of the
scalar 4-quar... | 0404176v5 |
2007-02-13 | Universality of QCD traveling-waves with running coupling | The Balitsky-Kovchegov QCD equation for rapidity evolution describing
saturation effects at high energy admits universal asymptotic traveling-wave
solutions when the nonlinear damping becomes effective. The asymptotic
solutions fall in universality classes depending only on some specific
properties of the solution of t... | 0702131v2 |
2006-11-23 | A coherent-state-based path integral for quantum mechanics on the Moyal plane | Inspired by a recent work that proposes using coherent states to evaluate the
Feynman kernel in noncommutative space, we provide an independent formulation
of the path-integral approach for quantum mechanics on the Moyal plane, with
the transition amplitude defined between two coherent states of mean position
coordinat... | 0611254v1 |
2004-11-30 | Development of singularities for the compressible Euler equations with external force in several dimensions | We consider solutions to the Euler equations in the whole space from a
certain class, which can be characterized, in particular, by finiteness of
mass, total energy and momentum. We prove that for a large class of right-hand
sides, including the viscous term, such solutions, no matter how smooth
initially, develop a si... | 0411652v2 |
2006-03-04 | Monotonicity properties of blow-up time for nonlinear Schrödinger equation: numerical tests | We consider the focusing nonlinear Schr\"{o}dinger equation, in the
$L^2$-critical and supercritical cases. We investigate numerically the
dependence of the blow-up time on a parameter in three cases: dependence upon
the coupling constant, when the initial data are fixed; dependence upon the
strength of a quadratic osc... | 0603107v2 |
2003-06-23 | Stochastic 'fuzzy confinement' of intrinsic localised modes | The long time diffusive behaviour of intrinsic localised modes (discrete
breathers) in the discrete damped-driven sine-Gordon chain under Gaussian white
noise (to simulate temperature) is studied. We present a theoretical model for
an approximate description of the diffusion, derive an expression for the
diffusion cons... | 0306043v2 |
2005-06-08 | Travelling kinks in discrete phi^4 models | In recent years, three exceptional discretizations of the phi^4 theory have
been discovered [J.M. Speight and R.S. Ward, Nonlinearity 7, 475 (1994); C.M.
Bender and A. Tovbis, J. Math. Phys. 38, 3700 (1997); P.G. Kevrekidis, Physica
D 183, 68 (2003)] which support translationally invariant kinks, i.e. families
of stati... | 0506019v2 |
2006-09-21 | Covariant response theory beyond RPA and its application | The covariant particle-vibration coupling model within the time blocking
approximation is employed to supplement the Relativistic Random Phase
Approximation (RRPA) with coupling to collective vibrations. The Bethe-Salpeter
equation in the particle-hole channel with an energy dependent residual
particle-hole (p-h) inter... | 0609061v1 |
2005-11-17 | Distance dependence of force and dissipation in non-contact atomic force microscopy on Cu(100) and Al(111) | The dynamic characteristics of a tip oscillating in the nc-AFM mode in close
vicinity to a Cu(100)-surface are investigated by means of phase variation
experiments in the constant amplitude mode. The change of the quality factor
upon approaching the surface deduced from both frequency shift and excitation
versus phase ... | 0511151v1 |
1998-08-22 | Quantum Coherence Oscillations in Antiferromagnetic Chains | Macroscopic quantum coherence oscillations in mesoscopic antiferromagnets may
appear when the anisotropy potential creates a barrier between the
antiferromagnetic states with opposite orientations of the Neel vector. This
phenomenon is studied for the physical situation of the nuclear spin system of
eight Xe atoms arra... | 9808041v1 |
1998-12-09 | The 1/N-expansion, quantum-classical correspondence and nonclassical states generation in dissipative higher-order anharmonic oscillators | We develop a method for the determination of thecdynamics of dissipative
quantum systems in the limit of large number of quanta N, based on the
1/N-expansion of Heidmann et al. [ Opt. Commun. 54, 189 (1985) ] and the
quantum-classical correspondence. Using this method, we find analytically the
dynamics of nonclassical ... | 9812019v2 |
2001-06-08 | Modelling the Recoherence of Mesoscopic Superpositions in Dissipative Environments | A model is presented to describe the recently proposed experiment (J.
Raimond,
M. Brune and S. Haroche Phys. Rev. Lett {\bf 79}, 1964 (1997)) where a
mesoscopic superposition of radiation states is prepared in a high-Q cavity
which is coupled to a similar resonator. The dynamical coherence loss of such
state in the a... | 0106044v1 |
2001-12-20 | Classical and Quantum-like approaches to Charged-Particle Fluids in a Quadrupole | A classical description of the dynamics of a dissipative charged-particle
fluid in a quadrupole-like device is developed. It is shown that the set of the
classical fluid equations contains the same information as a complex function
satisfying a Schrodinger-like equation in which Planck's constant is replaced
by the tim... | 0112123v1 |
2002-03-25 | Field quantization for open optical cavities | We study the quantum properties of the electromagnetic field in optical
cavities coupled to an arbitrary number of escape channels. We consider both
inhomogeneous dielectric resonators with a scalar dielectric constant
$\epsilon({\bf r})$ and cavities defined by mirrors of arbitrary shape. Using
the Feshbach projector ... | 0203122v2 |
2007-01-29 | Two-Mode Squeezed States and Entangled States of Two Mechanical Resonators | We study a device consisting of a dc-SQUID with two sections of its loop
acting as two mechanical resonators. An analog of the parametric
down-conversion process in quantum optics can be realized with this device. We
show that a two-mode squeezed state can be generated for two overdamped
mechanical resonators, where th... | 0701209v3 |
2007-04-26 | Type I singularities and the Phantom Menace | We consider the future dynamics of a transient phantom dominated phase of the
universe in LQC and in the RS braneworld, which both have a non-standard
Friedmann equation. We find that for a certain class of potentials, the Hubble
parameter oscillates with simple harmonic motion in the LQC case and therefore
avoids any ... | 0704.3606v4 |
2007-05-03 | Effective attraction induced by repulsive interaction in a spin-transfer system | In magnetic systems with dominating easy-plane anisotropy the magnetization
can be described by an effective one dimensional equation for the in-plane
angle. Re-deriving this equation in the presence of spin-transfer torques, we
obtain a description that allows for a more intuitive understanding of
spintronic devices' ... | 0705.0508v1 |
2007-05-08 | Particle-vibration coupling within covariant density functional theory | Covariant density functional theory, which has so far been applied only
within the framework of static and time dependent mean field theory is extended
to include Particle-Vibration Coupling (PVC) in a consistent way. Starting from
a conventional energy functional we calculate the low-lying collective
vibrations in Rel... | 0705.1044v1 |
2007-06-15 | Loschmidt echo and stochastic-like quantum dynamics of nano-particles | We investigate time evolution of prepared vibrational state (system) coupled
to a reservoir with dense spectrum of its vibrational states. We assume that
the reservoir has an equidistant spectrum, and the system - reservoir coupling
matrix elements are independent of the reservoir states. The analytical
solution manife... | 0706.2333v1 |
2007-06-21 | Spin pumping by a field-driven domain wall | We calculate the charge current in a metallic ferromagnet to first order in
the time derivative of the magnetization direction. Irrespective of the
microscopic details, the result can be expressed in terms of the conductivities
of the majority and minority electrons and the non-adiabatic spin transfer
torque parameter ... | 0706.3160v3 |
2007-07-25 | Polar phonons and spin-phonon coupling in HgCr2S4 and CdCr2S4 | Polar phonons of HgCr2S4 and CdCr2S4 are studied by far-infrared spectroscopy
as a function of temperature and external magnetic field. Eigenfrequencies,
damping constants, effective plasma frequencies and Lyddane-Sachs-Teller
relations, and effective charges are determined. Ferromagnetic CdCr2S4 and
antiferromagnetic ... | 0707.3776v1 |
2007-08-13 | Ricci curvature and geodesic flows stability in Riemannian twisted flux tubes | Ricci and sectional curvatures of twisted flux tubes in Riemannian manifold
are computed to investigate the stability of the tubes. The geodesic equations
are used to show that in the case of thick tubes, the curvature of planar
(Frenet torsion-free) tubes have the effect ct of damping the flow speed along
the tube. St... | 0708.1644v1 |
2007-08-21 | Phase effects on synchronization by dynamical relaying in delay-coupled systems | Synchronization in an array of mutually coupled systems with a finite
time-delay in coupling is studied using Josephson junction as a model system.
The sum of the transverse Lyapunov exponents is evaluated as a function of the
parameters by linearizing the equation about the synchronization manifold. The
dependence of ... | 0708.2759v4 |
2007-09-03 | Transport properties controlled by a thermostat: An extended dissipative particle dynamics thermostat | We introduce a variation of the dissipative particle dynamics (DPD)
thermostat that allows for controlling transport properties of molecular
fluids. The standard DPD thermostat acts only on a relative velocity along the
interatomic axis. Our extension includes the damping of the perpendicular
components of the relative... | 0709.0276v1 |
2007-09-07 | Broadband dielectric response of CaCu3Ti4O12: From dc to the electronic transition regime | We report on phonon properties and electronic transitions in CaCu3Ti4O12, a
material which reveals a colossal dielectric constant at room temperature
without any ferroelectric transition. The results of far- and mid-infrared
measurements are compared to those obtained by broadband dielectric and
millimeter-wave spectro... | 0709.1065v1 |
2007-10-07 | Decays in Quantum Hierarchical Models | We study the dynamics of a simple model for quantum decay, where a single
state is coupled to a set of discrete states, the pseudo continuum, each
coupled to a real continuum of states. We find that for constant matrix
elements between the single state and the pseudo continuum the decay occurs via
one state in a certai... | 0710.1403v1 |
2007-12-27 | Dynamics of emergent Cooper pairing at finite temperatures | We study the time evolution of a system of fermions with pairing interactions
at a finite temperature. The dynamics is triggered by an abrupt increase of the
BCS coupling constant. We show that if initially the fermions are in a normal
phase, the amplitude of the BCS order parameter averaged over the Boltzman
distribut... | 0712.4280v4 |
2008-04-14 | Micromagnetics of single and double point contact spin torque oscillators | In this paper we numerically conduct micromagnetic modelling to optimize
computational boundaries of magnetic thin-film elements applicable to single
and double point contact spin torque nano-oscillators. Different boundary
conditions have been introduced to compensate spin waves reflections at
boundaries that are base... | 0804.2119v1 |
2008-05-21 | Non-equilibrium thermodynamic study of magnetization dynamics in the presence of spin-transfer torque | The dynamics of magnetization in the presence of spin-transfer torque was
studied. We derived the equation for the motion of magnetization in the
presence of a spin current by using the local equilibrium assumption in
non-equilibrium thermodynamics. We show that, in the resultant equation, the
ratio of the Gilbert damp... | 0805.3306v1 |
2008-06-15 | Stochastic acceleration of solitons for the nonlinear Schrödinger equation | The effective dynamics of solitons for the generalized nonlinear
Schr\"odinger equation in a random potential is rigorously studied. It is shown
that when the external potential varies slowly in space compared to the size of
the soliton, the dynamics of the center of the soliton is almost surely
described by Hamilton's... | 0806.2439v1 |
2008-06-30 | Beam Coupling Impedance Measurement and Mitigation for a TOTEM Roman Pot | The longitudinal and transverse beam coupling impedance of the first final
TOTEM Roman Pot unit has been measured in the laboratory with the wire method.
For the evaluation of transverse impedance the wire position has been kept
constant, and the insertions of the RP were moved asymmetrically. With the
original configu... | 0806.4974v1 |
2009-02-25 | B-mode CMB Polarization from Patchy Screening during Reionization | B-modes in CMB polarization from patchy reionization arise from two effects:
generation of polarization from scattering of quadrupole moments by
reionization bubbles, and fluctuations in the screening of E-modes from
recombination. The scattering contribution has been studied previously, but the
screening contribution ... | 0902.4413v2 |
2009-03-10 | Phonon-phonon interactions and phonon damping in carbon nanotubes | We formulate and study the effective low-energy quantum theory of interacting
long-wavelength acoustic phonons in carbon nanotubes within the framework of
continuum elasticity theory. A general and analytical derivation of all three-
and four-phonon processes is provided, and the relevant coupling constants are
determi... | 0903.1771v2 |
2009-03-24 | Chaotic thermalization in Yang-Mills-Higgs theory on a spacial lattice | We analyze the Hamiltonian time evolution of classical SU(2) Yang-Mills-Higgs
theory with a fundamental Higgs doublet on a spacial lattice. In particular, we
study energy transfer and equilibration processes among the gauge and Higgs
sectors, calculate the maximal Lyapunov exponents under randomized initial
conditions ... | 0903.3990v2 |
2009-05-01 | Spin excitations in a monolayer scanned by a magnetic tip | Energy dissipation via spin excitations is investigated for a hard
ferromagnetic tip scanning a soft magnetic monolayer. We use the classical
Heisenberg model with Landau-Lifshitz-Gilbert (LLG)-dynamics including a
stochastic field representing finite temperatures. The friction force depends
linearly on the velocity (p... | 0905.0112v2 |
2009-05-18 | Long-term evolution and gravitational wave radiation of neutron stars with differential rotation induced by r-modes | In a second-order r-mode theory, S'a & Tom'e found that the r-mode
oscillation in neutron stars (NSs) could induce stellar differential rotation,
which leads to a saturation state of the oscillation spontaneously. Based on a
consideration of the coupling of the r-modes and the stellar spin and thermal
evolutions, we ca... | 0905.2804v1 |
2009-05-22 | Quantum dissipative Brownian motion and the Casimir effect | We explore an analogy between the thermodynamics of a free dissipative
quantum particle and that of an electromagnetic field between two mirrors of
finite conductivity. While a free particle isolated from its environment will
effectively be in the high-temperature limit for any nonvanishing temperature,
a finite coupli... | 0905.3608v1 |
2009-06-24 | Suppression of friction by mechanical vibrations | Mechanical vibrations are known to affect frictional sliding and the
associated stick-slip patterns causing sometimes a drastic reduction of the
friction force. This issue is relevant for applications in nanotribology and to
understand earthquake triggering by small dynamic perturbations .
We study the dynamics of re... | 0906.4504v1 |
2009-10-17 | Zero and First Sound in Normal Fermi Systems | On the basis of a moment method, general solutions of a linearized Boltzmann
equation for a normal Fermi system are investigated. In particular, we study
the sound velocities and damping rates as functions of the temperature and the
coupling constant. In the extreme limits of collisionless and hydrodynamic
regimes, eig... | 0910.3283v1 |
2010-02-11 | Spin drag in an ultracold Fermi gas on the verge of a ferromagnetic instability | Recent experiments [Jo et al., Science 325, 1521 (2009)] have presented
evidence of ferromagnetic correlations in a two-component ultracold Fermi gas
with strong repulsive interactions. Motivated by these experiments we consider
spin drag, i.e., frictional drag due to scattering of particles with opposite
spin, in such... | 1002.2371v2 |
2010-03-12 | Longitudinal dielectric permettivity of quantum Maxwell collisional plasmas | The kinetic equation of Wigner -- Vlasov -- Boltzmann with collision integral
in relaxation BGK (Bhatnagar, Gross and Krook) form in coordinate space for
quantum non--degenerate (Maxwellian) collisional plasma is used. Exact
expression (within the limits of considered model) is found. The analysis of
longitudinal diele... | 1003.2531v1 |
2010-04-11 | Quantum noise reduction using a cavity with a Bose Einstein condensate | We study an optomechanical system in which the collective density excitations
(Bogoliubov modes) of a Bose Einstein condensate (BEC) is coupled to a cavity
field. We show that the optical force changes the frequency and the damping
constant of the collective density excitations of the BEC. We further analyze
the occurr... | 1004.1813v1 |
2010-07-01 | Directed motion of domain walls in biaxial ferromagnets under the influence of periodic external magnetic fields | Directed motion of domain walls (DWs) in a classical biaxial ferromagnet
placed under the influence of periodic unbiased external magnetic fields is
investigated. Using the symmetry approach developed in this article the
necessary conditions for the directed DW motion are found. This motion turns
out to be possible if ... | 1007.0090v2 |
2010-08-23 | Perturbations of Dark Solitons | A method for approximating dark soliton solutions of the nonlinear
Schrodinger equation under the influence of perturbations is presented. The
problem is broken into an inner region, where core of the soliton resides, and
an outer region, which evolves independently of the soliton. It is shown that a
shelf develops aro... | 1008.3756v1 |
2010-08-30 | Directed transport in equilibrium | We investigate a symmetry broken dimer constrained to move in a particular
direction when in contact with a heat-bath at a constant temperature. The dimer
is not driven by any external force. The system gains kinetic energy from the
heat-bath. The symmetry broken system can use this energy in directed
transport. At the... | 1008.4992v8 |
2010-08-30 | Scalar graviton in the healthy extension of Hořava-Lifshitz theory | In this note we study the linear dynamics of scalar graviton in a de Sitter
background in the infrared limit of the healthy extension of
Ho\v{r}ava-Lifshitz gravity with the dynamical critical exponent $z=3$. Both
our analytical and numerical results show that the non-zero Fourier modes of
scalar graviton oscillate wit... | 1008.5048v3 |
2010-09-17 | Time resolved X-ray Resonant Magnetic Scattering in reflection geometry | We present a new setup to measure element-selective magnetization dynamics
using the ALICE chamber (RSI \textbf{74}, 4048 (2003)) at the BESSY II
synchrotron at the Helmholtz-Zentrum Berlin. A magnetic field pulse serves as
excitation, and the magnetization precession is probed by element selective
X-ray Resonant Magne... | 1009.3389v1 |
2011-02-07 | Buckling and longterm dynamics of a nonlinear model for the extensible beam | This work is focused on the longtime behavior of a non linear evolution
problem describing the vibrations of an extensible elastic homogeneous beam
resting on a viscoelastic foundation with stiffness k>0 and positive damping
constant. Buckling of solutions occurs as the axial load exceeds the first
critical value, \bet... | 1102.1259v1 |
2011-02-17 | Effects of disorder on magnetic vortex gyration | A vortex gyrating in a magnetic disk has two regimes of motion in the
presence of disorder. At large gyration amplitudes, the vortex core moves
quasi-freely through the disorder potential. As the amplitude decreases, the
core can become pinned at a particular point in the potential and precess with
a significantly incr... | 1102.3711v1 |
2011-03-30 | Spin motive forces due to magnetic vortices and domain walls | We study spin motive forces, i.e, spin-dependent forces, and voltages induced
by time-dependent magnetization textures, for moving magnetic vortices and
domain walls. First, we consider the voltage generated by a one-dimensional
field-driven domain wall. Next, we perform detailed calculations on
field-driven vortex dom... | 1103.5858v3 |
2011-05-02 | Ultrasoft Fermionic Mode in Yukawa Theory at High Temperature | We explore whether an ultrasoft fermionic mode exists at extremely high
temperature in Yukawa theory with massless fermion (coupling constant is g). We
find that the fermion propagator has a pole at \omega = \pm p/3-i\zeta, for
ultrasoft momentum p, where \zeta \sim g^4T ln 1/g, and the residue is Z \sim
g^2. It is sho... | 1105.0423v2 |
2011-07-17 | Spin current induced magnetization oscillations in a paramagnetic disc | When electron spins are injected uniformly into a paramagnetic disc, they can
precess along the demagnetizing field induced by the resulting magnetic moment.
Normally this precession damps out by virtue of the spin relaxation which is
present in paramagnetic materials. We propose a new mechanism to excite a
steady-stat... | 1107.3288v1 |
2011-11-09 | Numerical stability of the Z4c formulation of general relativity | We study numerical stability of different approaches to the discretization of
a conformal decomposition of the Z4 formulation of general relativity. We
demonstrate that in the linear, constant coefficient regime a novel
discretization for tensors is formally numerically stable with a method of
lines time-integrator. We... | 1111.2177v1 |
2011-11-16 | Evolution of the spectrum and the metal-insulator transition in local approximations for many-electron models | In the framework of the many-electron s-d exchange model and Hubbard model,
self-consistent equations are derived for the one-particle retarded Green's
function in the many-electron Hubbard X-operator representation. We analyze the
general structure of the single-site approximations and their connection with
the cohere... | 1111.3751v1 |
2011-11-22 | On the Kramers-Kronig transform with logarithmic kernel for the reflection phase in the Drude model | We use the Kramers-Kronig transform (KKT) with logarithmic kernel to obtain
the reflection phase and, subsequently, the complex refractive index of a bulk
mirror from reflectance. However, there remains some confusion regarding the
formulation for this analysis. Assuming the damped Drude model for the
dielectric consta... | 1111.5139v1 |
2011-12-22 | A continuous model for turbulent energy cascade | In this paper we introduce a new PDE model in frequency space for the
inertial energy cascade that reproduces the classical scaling laws of
Kolmogorov's theory of turbulence. Our point of view is based upon studying the
energy flux through a continuous range of scales rather than the discrete set
of dyadic scales. The ... | 1112.5376v1 |
2012-01-17 | Magnetic vortex echoes: application to the study of arrays of magnetic nanostructures | We propose the use of the gyrotropic motion of vortex cores in nanomagnets to
produce a magnetic echo, analogous to the spin echo in NMR. This echo occurs
when an array of nanomagnets, e.g., nanodisks, is magnetized with an in-plane
(xy) field, and after a time \tau a field pulse inverts the core magnetization;
the ech... | 1201.3553v1 |
2012-01-30 | Non-contact Friction and Relaxational Dynamics of Surface Defects | Motion of cantilever near sample surfaces exhibits additional friction even
before two bodies come into mechanical contact. Called non-contact friction
(NCF), this friction is of great practical importance to the ultrasensitive
force detection measurements. Observed large NCF of a micron-scale cantilever
found anomalou... | 1201.6378v1 |
2012-02-15 | Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect | We theoretically study the current-induced dynamics of a transverse magnetic
domain wall in bi-layer nanowires consisting of a ferromagnet on top of a
nonmagnet having strong spin-orbit coupling. Domain wall dynamics is
characterized by two threshold current densities, $J_{th}^{WB}$ and
$J_{th}^{REV}$, where $J_{th}^{W... | 1202.3450v1 |
2012-02-29 | Bimagnon studies in cuprates with Resonant Inelastic X-ray Scattering at the O K edge. II - The doping effect in La2-xSrxCuO4 | We present RIXS data at O K edge from La2-xSrxCuO4 vs. doping between x=0.10
and x=0.22 with attention to the magnetic excitations in the Mid-Infrared
region. The sampling done by RIXS is the same as in the undoped cuprates
provided the excitation is at the first pre-peak induced by doping. Note that
this excitation en... | 1202.6608v2 |
2012-03-08 | A Self-Consistent Marginally Stable State for Parallel Ion Cyclotron Waves | We derive an equation whose solutions describe self-consistent states of
marginal stability for a proton-electron plasma interacting with
parallel-propagating ion cyclotron waves. Ion cyclotron waves propagating
through this marginally stable plasma will neither grow nor damp. The
dispersion relation of these waves, {\... | 1203.1938v1 |
2012-03-14 | QSO 0347-383 and the invariance of m_p/m_e in the course of cosmic time | The variation of the dimensionless fundamental physical constant mu = m_p/m_e
(the proton to electron mass ratio) can be constrained via observation of Lyman
and Werner lines of molecular hydrogen in the spectra of damped Lyman alpha
systems (DLAs) in the line of sight to distant QSOs. Drawing on VLT-UVES high
resoluti... | 1203.3193v1 |
2012-03-26 | Local electric current correlation function in an exponentially decaying magnetic field | The effect of an exponentially decaying magnetic field on the dynamics of
Dirac fermions in 3+1 dimensions is explored. The spatially decaying magnetic
field is assumed to be aligned in the third direction, and is defined by
{\mathbf{B}}(x)=B(x){\mathbf{e}}_{z}, with B(x)=B_{0}e^{-\xi\ x/\ell_{B}}.
Here, \xi\ is a dime... | 1203.5634v2 |
2012-07-09 | Thermal vortex dynamics in thin circular ferromagnetic nanodisks | The dynamics of gyrotropic vortex motion in a thin circular nanodisk of soft
ferromagnetic material is considered. The demagnetization field is calculated
using two-dimensional Green's functions for the thin film problem and fast
Fourier transforms. At zero temperature, the dynamics of the
Landau-Lifshitz-Gilbert equat... | 1207.2192v2 |
2012-07-26 | Transient noise spectra in resonant tunneling setups: Exactly solvable models | We investigate the transient evolution of finite-frequency current noise
after abrupt switching on of the tunneling coupling in two paradigmatic,
exactly solvable models of mesoscopic physics: the resonant level model and the
Majorana resonant level model, which emerges as an effective model for a Kondo
quantum dot at ... | 1207.6222v2 |
2012-12-06 | Time-dependent spherically symmetric covariant Galileons | We study spherically symmetric solutions of the cubic covariant Galileon
model in curved spacetime in presence of a matter source, in the test scalar
field approximation. We show that a cosmological time evolution of the Galileon
field gives rise to an induced matter-scalar coupling, due to the
Galileon-graviton kineti... | 1212.1394v2 |
2012-12-13 | Astrophysical tests of atomic data important for stellar Mg abundance determinations | Magnesium abundances of cool stars with different metallicities are important
for understanding the galactic chemical evolution. This study tests atomic data
used in stellar magnesium abundance analyses. We evaluate non-local
thermodynamical equilibrium (NLTE) line formation for Mg I using the most
up-to-date theoretic... | 1212.3192v1 |
2013-01-14 | Universal Properties of the Higgs Resonance in (2+1)-Dimensional U(1) Critical Systems | We present spectral functions for the magnitude squared of the order
parameter in the scaling limit of the two-dimensional superfluid to Mott
insulator quantum phase transition at constant density, which has emergent
particle-hole symmetry and Lorentz invariance. The universal functions for the
superfluid, Mott insulat... | 1301.3139v2 |
2013-03-05 | Dynamics and relaxation in spin nematics | We study dynamics and relaxation of elementary excitations (magnons) in the
spin nematic (quadrupole ordered) phase of S=1 magnets. We develop a general
phenomenological theory of spin dynamics and relaxation for spin-1 systems.
Results of the phenomenological approach are compared to those obtained by
microscopic calc... | 1303.1194v2 |
2013-03-11 | Ultrasoft fermion mode and off-diagonal Boltzmann equation in quark-gluon plasma at high temperature | We derive the generalized Boltzmann equation (GBE) near equilibrium from the
Kadanoff-Baym equation for quark excitation with ultrasoft momentum (~g^2T, g:
coupling constant, T: temperature) in quantum chromodynamics (QCD) at extremely
high T, and show that the equation is equivalent to the self-consistent
equation der... | 1303.2684v1 |
2013-03-27 | Superluminal Waves and the Structure of Pulsar Wind Termination Shocks | The termination shock of a pulsar wind is located roughly where the ram
pressure matches that of the surrounding medium. Downstream of the shock, MHD
models of the diffuse nebular emission suggest the plasma is weakly magnetized.
However, the transition from a Poynting-dominated MHD wind to a
particle-dominated flow is... | 1303.6781v1 |
2013-04-26 | Strong magnon softening in tetragonal FeCo compounds | Magnons play an important role in fast precessional magnetization reversal
processes serving as a heat bath for dissipation of the Zeeman energy and thus
being responsible for the relaxation of magnetization. Employing \emph{ab
initio} many-body perturbation theory we studied the magnon spectra of the
tetragonal FeCo c... | 1304.7091v1 |
2013-07-01 | Quasinormal modes of charged dilaton black holes and their entropy spectra | In this study, we employ the scalar perturbations of the charged dilaton
black hole (CDBH) found by Chan, Horne and Mann (CHM), and described with an
action which emerges in the low-energy limit of the string theory. A CDBH is
neither asymptotically flat (AF) nor non-asymptotically flat (NAF) spacetime.
Depending on th... | 1307.0340v2 |
2013-07-10 | The Contrastive analysis of observation data between HLS and DSQ water tube clinometers in Jingxian seismicstation | A set of HLS was installed in JingXian seismicstation for the tidal
correction of observations from HLS. Harmonic analysis of the data recorded by
HLS and DSQ water tube clinometers in JingXian seismicstation and contrastive
analysis of the results are completed. The tilt tide can be well reflected in
the data of the b... | 1307.2680v2 |
2013-07-26 | Transients in the Synchronization of Oscillator Arrays | The purpose of this note is threefold. First we state a few conjectures that
allow us to rigorously derive a theory which is asymptotic in N (the number of
agents) that describes transients in large arrays of (identical) linear damped
harmonic oscillators in R with completely decentralized nearest neighbor
interaction.... | 1308.4919v4 |
2013-09-05 | Amplification and passing through the barrier of the exciton condensed phase pulse in double quantum wells | The peculiarities and the possibility of a control of exciton condensed pulse
movement in semiconductor double quantum well under the slot in the metal
electrode are studied. The condensed phase is considered phenomenologically
with the free energy in Landau-Ginzburg form taking into account the finite
value of the exc... | 1309.1297v1 |
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