publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2009-12-24 | A resonance model with magnetic connection for 3:2 HFQPO pairs in black hole binaries | We apply epicyclic resonances to the magnetic connection (MC) of a black hole
(BH) with a relativistic accretion disc, interpreting the high frequency
quasi-periodic oscillations (HFQPOs) with 3:2 pairs observed in three BH X-ray
binaries. It turns out that the 3:2 HFQPO pairs are associated with the steep
power-law st... | 0912.4776v1 |
2010-01-03 | Stabilities for Euler-Poisson Equations with Repulsive Forces in R^N | This article extends the previous paper in "M.W. Yuen, \textit{Stabilities
for Euler-Poisson Equations in Some Special Dimensions}, J. Math. Anal. Appl.
\textbf{344} (2008), no. 1, 145--156.", from the Euler-Poisson equations for
attractive forces to the repulsive ones in $R^{N}$ $(N\geq2)$. The similar
stabilities of ... | 1001.0385v1 |
2010-01-10 | Production of entanglement in Raman three-level systems using feedback | We examine the theoretical limits of the generation of entanglement in a
damped coupled ion-cavity system using jump-based feedback. Using Raman
transitions to produce entanglement between ground states reduces the necessary
feedback bandwidth, but does not improve the overall effect of the spontaneous
emission on the ... | 1001.1567v1 |
2010-01-15 | Coulomb screening and collective excitations in biased bilayer graphene | We have investigated the Coulomb screening properties and plasmon spectrum in
a bilayer graphene under a perpendicular electric bias. The bias voltage
applied between the two graphene layers opens a gap in the single particle
energy spectrum and modifies the many-body correlations and collective
excitations. The energy... | 1001.2762v1 |
2010-01-18 | Quiet sigma delta quantization, and global convergence for a class of asymmetric piecewise affine maps | In this paper, we introduce a family of second-order sigma delta quantization
schemes for analog-to-digital conversion which are `quiet' : quantization
output is guaranteed to fall to zero at the onset of vanishing input. In the
process, we prove that the origin is a globally attractive fixed point for the
related fami... | 1001.2955v2 |
2010-01-20 | Non-Markovian dynamics of a damped driven two-state system | We study a driven two-state system interacting with a structured environment.
We introduce the non-Markovian master equation ruling the system dynamics, and
we derive its analytic solution for general reservoir spectra. We compare the
non-Markovian dynamics of the Bloch vector for two classes of reservoir
spectra: the ... | 1001.3564v2 |
2010-01-26 | Non-Markovian reservoir-dependent squeezing | The squeezing dynamics of a damped harmonic oscillator are studied for
different types of environment without making the Markovian approximation. The
squeezing dynamics of a coherent state depend on the reservoir spectrum in a
unique way that can, in the weak coupling approximation, be analyzed
analytically. Comparison... | 1001.4669v1 |
2010-02-01 | Non linear diffusion and wave damped propagation : weak solutions and statistical turbulence behavior | We present mathematical proofs on the existence and uniqueness of weak
solutions for a special class of non linear parabolic and hyperbolic equations
of mathematical physics subject to colored noise (structured turbulence) as
random- initial conditions | 1002.0165v2 |
2010-02-04 | Sudden violation of the CHSH inequality in a two qubits system | I study the dynamics of the violation of the CHSH inequality for two qubits
interacting with a common zero-temperature non-Markovian environment. I
demonstrate sudden violation of the inequality for two qubits initially
prepared in a factorized state. Due to the strong coupling between the qubits
and the reservoir, the... | 1002.1000v1 |
2010-02-08 | Backward Raman compression of x-rays in metals and warm dense matters | Experimentally observed decay rate of the long wavelength Langmuir wave in
metals and dense plasmas is orders of magnitude larger than the prediction of
the prevalent Landau damping theory. The discrepancy is explored, and the
existence of a regime where the forward Raman scattering is stable and the
backward Raman sca... | 1002.1735v2 |
2010-02-09 | The pulse and monochromatic light stimulation of semiconductor quantum wells | The light reflectance and absorbance are calculated for a quantum well (QW)
the width of which is comparable with the light wave length. The difference of
the refraction coefficients of the quantum well and barriers is taken into
account. The stimulating pulse form is arbitrary. An existence of two closely
situated dis... | 1002.1780v1 |
2010-02-09 | Asymptotical photon distributions in the dissipative Dynamical Casimir Effect | Asymptotical formulas for the photon distribution function of a quantum
oscillator with time-dependent frequency and damping coefficients, interacting
with a thermal reservoir, are derived in the case of a large mean number of
quanta. Different regimes of excitation of an initial thermal state with an
arbitrary tempera... | 1002.1861v1 |
2010-02-16 | Dynamical Unbinding Transition in a Periodically Driven Mott Insulator | We study the double occupancy in a fermionic Mott insulator at half-filling
generated via a dynamical periodic modulation of the hopping amplitude. Tuning
the modulation amplitude, we describe a crossover in the nature of
doublon-holon excitations from a Fermi Golden Rule regime to damped Rabi
oscillations. The decay t... | 1002.3085v1 |
2010-02-19 | Observation of magnetocoriolis waves in a liquid metal Taylor-Couette experiment | The first observation of fast and slow magnetocoriolis (MC) waves in a
laboratory experiment is reported. Rotating nonaxisymmetric modes arising from
a magnetized turbulent Taylor-Couette flow of liquid metal are identified as
the fast and slow MC waves by the dependence of the rotation frequency on the
applied field s... | 1002.3791v1 |
2010-03-11 | Exact quasinormal modes for a special class of black holes | Analytic exact expressions for the quasinormal modes of scalar and
electromagnetic perturbations around a special class of black holes are found
in d\ge3 dimensions. It is shown that, the size of the black hole provides a
bound for the angular momentum of the perturbation. Quasinormal modes appear
when this bound is fu... | 1003.2256v1 |
2010-03-12 | Symmetry Analysis of 2+1 dimensional Burgers equation with variable damping | The symmetry classification of the two dimensional Burgers equation with
variable coefficient is considered. Symmetry algebra is found and a
classification of its subalgebras, up to conjugacy, is obtained. Similarity
reductions are performed for each class. | 1003.2511v1 |
2010-03-16 | Driven Dirac-like Equation via Mirror Oscillation: Controlled Cold-Atom Zitterbewegung | By considering mirror oscillation in a "tripod-scheme" laser-atom system, we
advocate explorative studies of driven Dirac-like equations. Both analytical
and numerical studies show that mirror oscillation can be used to drive an
effective spin-orbit interaction and hence control the amplitude, the
frequency, and the da... | 1003.3074v1 |
2010-03-18 | Stimulated Raman adiabatic passage in an open quantum system: Master equation approach | A master equation approach to the study of environmental effects in the
adiabatic population transfer in three-state systems is presented. A systematic
comparison with the non-Hermitian Hamiltonian approach [N. V. Vitanov and S.
Stenholm, Phys. Rev. A {\bf 56}, 1463 (1997)] shows that in the weak coupling
limit the two... | 1003.3616v1 |
2010-03-19 | Self-stimulated Emission of Undulator Radiation | We attract attention that interaction of particle in downstream undulator
with its own wavelet emitted in upstream undulator could be as strong as with
the frictional field in undulator itself. This phenomenon could be used for
enhancement of signal from pickup undulators in optical stochastic cooling
methods as well a... | 1003.3747v1 |
2010-03-19 | Dynamics of magnetization on the topological surface | We investigate theoretically the dynamics of magnetization coupled to the
surface Dirac fermions of a three dimensional topological insulator, by
deriving the Landau-Lifshitz-Gilbert (LLG) equation in the presence of charge
current. Both the inverse spin-Galvanic effect and the Gilbert damping
coefficient $\alpha$ are ... | 1003.3769v1 |
2010-03-23 | Effect of extra dimensions on gravitational waves from cosmic strings | We show how taking into account the kinematical effect of extra dimensions
can have a significant impact on the gravity wave emission from cosmic strings.
Additional dimensions both round off cusps, as well as reduce the probability
of their formation. We recompute the cusp gravity wave burst with these factors
and fin... | 1003.4395v2 |
2010-03-31 | Energy carriers in the Fermi-Pasta-Ulam $β$ lattice: Solitons or Phonons? | We investigate anomalous energy transport processes in the Fermi-Pasta-Ulam
$\beta$ lattice. They are determined by the maximum sound velocity of the
relevant weakly damped energy carriers. That velocity can be numerically
resolved by measuring the propagating fronts of the correlation functions of
energy/momentum fluc... | 1003.6113v1 |
2010-04-07 | Neutrino Flavor Ratio on Earth and at Astrophysical Sources | We present the reconstruction of neutrino flavor ratios at astrophysical
sources. For distinguishing the pion source and the muon-damped source to the
3$\sigma$ level, the neutrino flux ratios,
$R\equiv\phi(\nu_\mu)/(\phi(\nu_e)+\phi(\nu_\tau))$ and
$S\equiv\phi(\nu_e)/\phi(\nu_\tau)$, need to be measured in accuracies... | 1004.1030v1 |
2010-04-08 | Ab initio vibrations in nonequilibrium nanowires | We review recent results on electronic and thermal transport in two different
quasi one-dimensional systems: Silicon nanowires (SiNW) and atomic gold chains.
For SiNW's we compute the ballistic electronic and thermal transport properties
on equal footing, allowing us to make quantitative predictions for the
thermoelect... | 1004.1312v1 |
2010-04-08 | Spin-charge and spin-orbital coupling effects on spin dynamics in ferromagnetic manganites | Correlation-induced spin-charge and spin-orbital coupling effects on spin
dynamics in ferromagnetic manganites are calculated with realistic parameters
in order to provide a quantitative comparison with experimental results for
spin stiffness, magnon dispersion, magnon damping, anomalous zone-boundary
magnon softening,... | 1004.1352v2 |
2010-04-12 | Existence and stability of steady states of a reaction convection diffusion equation modeling microtubule formation | We generalize the Dogterom-Leibler model for microtubule dynamics [DL] to the
case where the rates of elongation as well as the lifetimes of the elongating
and shortening phases are a function of GTP-tubulin concentration. We study
also the effect of nucleation rate in the form of a damping term which leads to
new stea... | 1004.1866v1 |
2010-04-14 | Non-equilibrium Effects in the Thermal Switching of Underdamped Josephson Junctions | We study the thermal escape problem in the low damping limit. We find that
finiteness of the barrier is crucial for explaining the thermal activation
results. In this regime low barrier non-equilibrium corrections to the usual
theories become necessary. We propose a simple theoretical extension accounting
for these non... | 1004.2512v1 |
2010-04-18 | Fundamental defect of the macroeconomic thinking as one of the main causes of the crisis endured | The main points of the first section of the article written by S.I.
Chernyshov, A.V. Voronin and S.A. Razumovsky arXiv:1003.4382), which deals with
the fundamental bases of the macroeconomic theory, have been analyzed. An
incorrectness of the Harrod's model of the economical growth in its generally
accepted interpretat... | 1004.3067v1 |
2010-04-19 | Occurrence of superconductivity when the metal-insulator transition is inhibited in $1T$-TaS${_2}$ | When a Mott metal-insulator transition is inhibited by a small amount of
disorder in the layered dichalcogenide 1T-TaS$_2$, an inhomogeneous
superconducting state arises below T=2.1 K, and coexists with a
nearly-commensurate charge-density-wave. By angle-resolved photoelectron
spectroscopy (ARPES) we show that it emerg... | 1004.3251v1 |
2010-05-06 | A probability-conserving dissipative Schrödinger equation | Dissipative effects on a microscopic level are included in the Schr\"odinger
equation. When the decay between different local levels as a result of the
coupling to a bath, the Schr\"odinger equation no longer conserves energy, but
the probability of the states is conserved. The procedure is illustrated with
several exa... | 1005.1079v1 |
2010-05-10 | A New Approach to Non-Commutative U(N) Gauge Fields | Based on the recently introduced model of arXiv:0912.2634 for non-commutative
U(1) gauge fields, a generalized version of that action for U(N) gauge fields
is put forward. In this approach to non-commutative gauge field theories, UV/IR
mixing effects are circumvented by introducing additional 'soft breaking' terms
in t... | 1005.1578v2 |
2010-05-18 | The effect of extra dimensions on gravity wave bursts from cosmic string cusps | We explore the kinematical effect of having extra dimensions on the gravity
wave emission from cosmic strings. Additional dimensions both round off cusps,
and reduce the probability of their formation. We recompute the gravity wave
burst, taking into account these two factors, and find a potentially
significant damping... | 1005.3220v2 |
2010-05-24 | Direct observation of paramagnons in palladium | We report an inelastic neutron scattering study of the spin fluctuations in
the nearly-ferromagnetic element palladium. Dispersive over-damped collective
magnetic excitations or ``paramagnons'' are observed up to 128 meV. We analyze
our results in terms of a Moriya-Lonzarich-type spin fluctuation model and
estimate the... | 1005.4402v1 |
2010-06-01 | High Gradient Superconducting Cavity with Low Surface EM Fields and Well-Suppressed HOMS for the ILC | We present an optimized geometry for a 1.3 GHz superconducting cavity in
which the surface electromagnetic fields have been minimized and the bandwidth
of the fundamental mode has been maximized. We refer to this design as the New
Low Surface Field (NLSF) cavity. Earlier work focused on properties of the
fundamental mo... | 1006.0086v1 |
2010-06-14 | Transport parameters in neutron stars from in-medium NN cross sections | We present a numerical study of shear viscosity and thermal conductivity of
symmetric nuclear matter, pure neutron matter and $\beta$-stable nuclear
matter, in the framework of the Brueckner theory. The calculation of in-medium
cross sections and nucleon effective masses is performed with a consistent two
and three bod... | 1006.2656v1 |
2010-06-25 | Perturbations of Mathieu equations with parametric excitation of large period | We consider a linear differential system of Mathieu equations with periodic
coefficients over periodic closed orbits and we prove that, arbitrarily close
to this system, there is a linear differential system of Hamiltonian damped
Mathieu equations with periodic coefficients over periodic closed orbits such
that, all bu... | 1006.5025v1 |
2010-07-01 | Instability of ion kinetic waves in a weakly ionized plasma | The fundamental higher-order Landau plasma modes are known to be generally
heavily damped. We show that these modes for the ion component in a weakly
ionized plasma can be substantially modified by ion-neutral collisions and a dc
electric field driving ion flow so that some of them can become unstable. This
instability... | 1007.0142v3 |
2010-07-06 | Temperature and Friction Accelerated Sampling of Boltzmann-Gibbs Distribution | This paper is concerned with tuning friction and temperature in Langevin
dynamics for fast sampling from the canonical ensemble. We show that
near-optimal acceleration is achieved by choosing friction so that the local
quadratic approximation of the Hamiltonian is a critical damped oscillator. The
system is also over-h... | 1007.0995v1 |
2010-07-09 | Purely electrical damping of vibrations in arbitrary PEM plates: a mixed non-conforming FEM-Runge-Kutta time evolution analysis | A new numerical code, based upon a mixed FEM-Runge-Kutta method, is used for
the analysis and design of plane 2-D smart structures. The code is applied to
the study of arbitrarily shaped PEM plates, based on a weak formulation of
their governing equations, [17]. The optimal parameters needed to synthesize
appropriate e... | 1007.1581v1 |
2010-08-02 | Entanglement and teleportation via chaotic system | The dynamics of entangled state interacting with a single cavity mode is
investigated in the presence of a random parameter. We have shown that degree
of entanglement decays with time and rate of decay is defined by features of
random parameter. Quantum teleportation through dissipative channal and
teleportation fideli... | 1008.0323v1 |
2010-08-03 | AMENDART in Markovian circuit QED | We study the cavity field's and atomic asymptotic mean excitation numbers due
to anti-rotating term (AMENDART) in the circuit Quantum Electrodynamics
(circuit QED) system, composed of a two-level atom and a single cavity field
mode, subject to Markovian damping and dephasing mechanisms. We show that the
AMENDART are ab... | 1008.0564v2 |
2010-08-04 | Quantum open systems approach to the dynamical Casimir effect | We analyze the introduction of dissipative effects in the study of the
dynamical Casimir effect. We consider a toy model for an electromagnetic cavity
that contains a semiconducting thin shell, which is irradiated with short laser
pulses in order to produce periodic oscillations of its conductivity. The
coupling betwee... | 1008.0786v1 |
2010-08-16 | The probability distribution of a trapped Brownian particle in plane shear flows | We investigate the statistical properties of an over-damped Brownian particle
that is trapped by a harmonic potential and simultaneously exposed to a linear
shear flow or to a plane Poiseuille flow. Its probability distribution is
determined via the corresponding Smoluchowski equation, which is solved
analytically for ... | 1008.2670v3 |
2010-09-04 | Combined Influence of Off-diagonal System Tensors and Potential Valley Returning of the Optimal Path | The two-dimensional barrier passage is studied in the framework of Langevin
statistical reactive dynamics. The optimal incident angle for a particle
diffusing in the dissipative non-orthogonal environment with various strengths
of coupling between the two degrees of freedom is systematically calculated.
The optimal dif... | 1009.0835v1 |
2010-09-11 | Critical density of urban traffic | A modified version of the Intelligent Driver Model was used to simulate
traffic in the district of Afogados, in the city of Recife, Brazil, with the
objective to verify whether the complexity of the underlying street grid, with
multiple lane streets, crossings, and semaphores, is capable of exhibiting the
effect of cri... | 1009.2180v1 |
2010-09-11 | Nonlinear optical response of hole-trion systems in quantum dots in tilted magnetic fields | We discuss, from a theoretical point of view, the four wave mixing
spectroscopy on an ensemble of p-doped quantum dots in a magnetic field
slightly tilted from the in-plane configuration. We describe the system
evolution in the density matrix formalism. In the limit of coherent ultrafast
optical driving, we obtain anal... | 1009.2202v1 |
2010-09-17 | Linear response calculation using the canonical-basis TDHFB with a schematic pairing functional | A canonical-basis formulation of the time-dependent Hartree-Fock-Bogoliubov
(TDHFB) theory is obtained with an approximation that the pair potential is
assumed to be diagonal in the time-dependent canonical basis. The
canonical-basis formulation significantly reduces the computational cost. We
apply the method to linea... | 1009.3339v1 |
2010-10-14 | Behavior of test particles in the plasma sheath upon local bias and plasma switching | Equilibrating gravitation by electric forces, microparticles can be confined
in the plasma sheath above suitably biased local electrodes.Their position
depends on the detailed structure of the plasma sheath and on the charge that
the particles acquire in the surrounding plasma, that is by the electron and
ion currents ... | 1010.2862v1 |
2010-10-15 | Anomalous diffusion in viscosity landscapes | Anomalous diffusion is predicted for Brownian particles in inhomogeneous
viscosity landscapes by means of scaling arguments, which are substantiated
through numerical simulations. Analytical solutions of the related
Fokker-Planck equation in limiting cases confirm our results. For an ensemble
of particles starting at a... | 1010.3115v1 |
2010-10-17 | Coherent soft-mode phonon generation and detection in ultrathin SrTiO3 grown directly on silicon | Time-resolved two color pump-probe polarization spectroscopy was performed at
room temperature on SrTiO3 films grown directly on Si with film thickness
varying from 2 nm to 7.8 nm. The E soft mode with a characteristic frequency of
0.2 THz is impulsively generated and measured in these coherently strained
tetragonal ph... | 1010.3443v1 |
2010-11-09 | Hamiltonian formulation of the effective kinetic theory for superfluid Fermi liquids | We present in a local form the time dependent effective description of a
superfluid Fermi liquid which includes Landau damping effects at $T\neq 0$.
This is achieved by the introduction of an additional variable, the
quasiparticle distribution function, which obeys a simple kinetic equation. The
transport equation is c... | 1011.2040v1 |
2010-11-15 | Decoherence Strength of Multiple Non-Markovian Environments | It is known that one can characterize the decoherence strength of a Markovian
environment by the product of its temperature and induced damping, and order
the decoherence strength of multiple environments by this quantity. We show
that for non-Markovian environments in the weak coupling regime there also
exists a natur... | 1011.3286v3 |
2010-11-18 | Stochastic Resonance in Periodic Potentials | The phenomenon of stochastic resonance (SR) is known to occur mostly in
bistable systems. However, the question of occurrence of SR in periodic
potential systems is not conclusively resolved. Our present numerical work
shows that the periodic potential system indeed exhibits SR in the high
frequency regime, where the l... | 1011.4198v2 |
2010-11-19 | Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling | We theoretically describe the spin excitation spectrum of a two dimensional
electron gas embedded in a quantum well with localized magnetic impurities.
Compared to the previous work, we introduce equations that allow to consider
the interplay between the Coulomb interaction of delocalized electrons and the
$sd$ exchang... | 1011.4422v1 |
2010-11-22 | Global p-mode oscillations throughout the complete solar cycle 23 and the beginning of cycle 24 | The parameters of the p-mode oscillations vary with solar activity. Such
temporal variations provide insights for the study of the structural and
dynamical changes occurring in the Sun's interior throughout the solar cycle.
We present here a complete picture of the temporal variations of the global
p-mode parameters (e... | 1011.4966v1 |
2010-11-24 | Evolution equation of entanglement for multi-qubit systems | We discuss entanglement evolution of a multi-qubit system when one of its
qubits is subjected to a general noisy channel. For such a system, an evolution
equation of entanglement for a lower bound for multi-qubit concurrence is
derived. Using this evolution equation, the entanglement dynamics of an
initially mixed thre... | 1011.5348v1 |
2010-12-06 | Two Proposals for Robust PCA using Semidefinite Programming | The performance of principal component analysis (PCA) suffers badly in the
presence of outliers. This paper proposes two novel approaches for robust PCA
based on semidefinite programming. The first method, maximum mean absolute
deviation rounding (MDR), seeks directions of large spread in the data while
damping the eff... | 1012.1086v3 |
2010-12-07 | Cavity cooling of a mechanical resonator in the presence of two-level-system defects | Cavity cooling via quantum backaction force can extract thermal fluctuations
from a mechanical resonator to reach the quantum ground state. Surface or bulk
two-level-system (TLS) defects in a mechanical resonator can couple with the
mechanical mode via deformation potential and affect the cooling process
significantly.... | 1012.1380v2 |
2010-12-10 | Spin-orbit driven ferromagnetic resonance: A nanoscale magnetic characterisation technique | We demonstrate a scalable new ferromagnetic resonance (FMR) technique based
on the spin-orbit interaction. An alternating current drives FMR in uniform
ferromagnetic structures patterned from the dilute magnetic semiconductors
(Ga,Mn)As and (Ga,Mn)(As,P). This allows the direct measurement of magnetic
anisotropy coeffi... | 1012.2397v1 |
2010-12-12 | Quasi-two-dimensional optomechanical crystals with a complete phononic bandgap | A fully planar two-dimensional optomechanical crystal formed in a silicon
microchip is used to create a structure devoid of phonons in the GHz frequency
range. A nanoscale photonic crystal cavity is placed inside the phononic
bandgap crystal in order to probe the properties of the localized acoustic
modes. By studying ... | 1012.2556v1 |
2010-12-22 | Discovering author impact: A PageRank perspective | This article provides an alternative perspective for measuring author impact
by applying PageRank algorithm to a coauthorship network. A weighted PageRank
algorithm considering citation and coauthorship network topology is proposed.
We test this algorithm under different damping factors by evaluating author
impact in t... | 1012.4870v1 |
2010-12-29 | On sub-ideal causal smoothing filters | Smoothing causal linear time-invariant filters are studied for continuous
time processes. The paper suggests a family of causal filters with almost
exponential damping of the energy on the higher frequencies. These filters are
sub-ideal meaning that a faster decay of the frequency response would lead to
the loss of cau... | 1012.5883v3 |
2011-01-06 | Dissipative dynamics of a harmonically confined Bose-Einstein condensate | We study the dissipation of the centre of mass oscillation of a harmonically
confined condensate in the presence of a disorder potential. An extension of
the Generalized Harmonic Theorem allows one to formulate the dynamics from the
point of view of an oscillating disorder potential. This formulation leads to a
rigorou... | 1101.1332v2 |
2011-01-25 | Magnetic field generated by r-modes in accreting quark stars | We show that the r-mode instability can generate strong toroidal fields in
the core of accreting millisecond quark stars by inducing differential
rotation. We follow the spin frequency evolution on a long time scale taking
into account the magnetic damping rate in the evolution equations of r-modes.
The maximum spin fr... | 1101.4875v1 |
2011-02-04 | Long-Term Damped Dynamics of the Extensible Suspension Bridge | This work is focused on the doubly nonlinear equation, whose solutions
represent the bending motion of an extensible, elastic bridge suspended by
continuously distributed cables which are flexible and elastic with stiffness
k^2. When the ends are pinned, long-term dynamics is scrutinized for arbitrary
values of axial l... | 1102.0877v1 |
2011-02-07 | Experimental demonstration of decoherence suppression via quantum measurement reversal | Taming decoherence is essential in realizing quantum computation and quantum
communication. Here we experimentally demonstrate that decoherence due to
amplitude damping can be suppressed by exploiting quantum measurement reversal
in which a weak measurement and the reversing measurement are introduced before
and after ... | 1102.1303v2 |
2011-02-11 | Simple proof of the robustness of Gaussian entanglement in bosonic noisy channels | The extremality of Gaussian states is exploited to show that Gaussian states
are the most robust, among all possible bipartite continuous-variable states at
fixed energy, against disentanglement due to noisy evolutions in Markovian
Gaussian channels involving dissipation and thermal hopping. This proves a
conjecture ra... | 1102.2356v1 |
2011-02-25 | First-principles calculations of magnetization relaxation in pure Fe, Co, and Ni with frozen thermal lattice disorder | The effect of the electron-phonon interaction on magnetization relaxation is
studied within the framework of first-principles scattering theory for Fe, Co,
and Ni by displacing atoms in the scattering region randomly with a thermal
distribution. This "frozen thermal lattice disorder" approach reproduces the
non-monoton... | 1102.5305v2 |
2011-02-26 | Dynamics of Skyrmion Crystals in Metallic Thin Films | We study the collective dynamics of the Skyrmion crystal (SkX) in thin films
of ferromagnetic metals resulting from the nontrivial Skyrmion topology. We
show that the current-driven motion of the crystal reduces the topological Hall
effect and the Skyrmion trajectories bend away from the direction of the
electric curre... | 1102.5384v2 |
2011-03-06 | Rapid cooling of neutron star in Cassiopeia A and r-mode damping in the core | We proposed alternative explanation to the rapid cooling of neutron star in
Cas A. It is suggested that the star is experiencing the recovery period
following the r-mode heating process,assuming the star is differentially
rotating. Like the neutron-superfluidity-triggering model, our model predicts
the rapid cooling wi... | 1103.1092v3 |
2011-03-11 | Dynamic Systems Model for Ionic Mem-Resistors based on Harmonic Oscillation | Memristive system models have previously been proposed to describe ionic
memory resistors. However, these models neglect the mass of ions and repulsive
forces between ions and are not well formulated in terms of semiconductor and
ionic physics. This article proposes an alternative dynamic systems model in
which the sys... | 1103.2190v4 |
2011-03-14 | Conflicting coupling of the unpaired nucleons and the structure of collective bands in odd-odd nuclei | Conflicting coupling of unpaired nucleons in the odd-odd nuclei is discussed.
A very simple explanation is suggested for the damping of the energy spacing of
the lowest levels in the rotational bands in the odd-odd nuclei in the case of
a "conflicting" coupling of the odd proton and neutron comparative to those of
the ... | 1103.2609v1 |
2011-03-20 | Rational Design of Half-Metallic Heterostructures | We present a rational approach to the design of half-metallic
heterostructures which allows the design of an infinite number of half-metallic
heterostructures. The wide range of materials that can be made half-metallic
using our approach makes it possible to engineer materials with tunable
characteristic properties, fo... | 1103.3855v1 |
2011-03-20 | Uniform resolvent estimates for a non-dissipative Helmholtz equation | We study the high frequency limit for a non-dissipative Helmholtz equation.
We first prove the absence of eigenvalue on the upper half-plane and close to
an energy which satisfies a weak damping assumption on trapped trajectories.
Then we generalize to this setting the resolvent estimates of Robert-Tamura and
prove the... | 1103.3868v1 |
2011-03-24 | Effect of nonadiabatic spin transfer torque on domain wall resonance frequency and mass | The dynamics of a magnetic domain wall in a semi circular nanowire loop is
studied by an analytical model and micromagnetic simulations. We find a damped
sinusoidal oscillation of the domain wall for small displacement angles around
its equilibrium position under an external magnetic field in the absence of
currents. B... | 1103.4670v1 |
2011-03-25 | Multipartite entanglement for open system in noninertial frames | Based on Greenberger-Horne-Zeilinger ($GHZ$) and $W$ initial states, the
tripartite entanglement of a fermionic system under the amplitude damping
channel and in depolarizing noise when two subsystems accelerated is
investigated. Unlike the case of two-qubit system in which sudden death occurs
easily, we find here that... | 1103.4903v1 |
2011-04-08 | Coherence and Instability in a Driven Bose-Einstein Condensate: A Fully Dynamical Number-Conserving Approach | We consider a Bose-Einstein condensate driven by periodic delta-kicks. In
contrast to first-order descriptions, which predict rapid, unbounded growth of
the noncondensate in resonant parameter regimes, the consistent treatment of
condensate depletion in our fully-time-dependent, second-order description acts
to damp th... | 1104.1521v3 |
2011-04-25 | Rotation of Comet Hartley 2 from Structures in the Coma | The CN coma structure of the EPOXI mission target, comet 103P/Hartley 2, was
observed during twenty nights from September to December 2010. These CN images
probe the rotational state of the comet's nucleus and provide a ground-based
observational context to complement the EPOXI observations. A dynamically
excited comet... | 1104.4672v1 |
2011-05-11 | Dispersion and damping of multi-quantum well polaritons from resonant Brillouin scattering by folded acoustic modes | We report on confined exciton resonances of acoustic and folded acoustic
phonon light scattering in a GaAs/AlAs multi-quantum-well. Significant
variations of the line shifts and widths are observed across the resonance and
quantitatively reproduced in terms of the polariton dispersion. This high
resolution Brillouin st... | 1105.2229v1 |
2011-05-23 | Radiative damping: a case study | We are interested in the motion of a classical charge coupled to the Maxwell
self-field and subject to a uniform external magnetic field, B. This is a
physically relevant, but difficult dynamical problem, to which contributions
range over more than one hundred years. Specifically, we will study the
Sommerfeld-Page appr... | 1105.4470v1 |
2011-05-27 | Creating quantum correlations through local non-unitary memoryless channels | We show that two qubits, initially in a fully classical state, can develop
significant quantum correlations as measured by the quantum discord (QD) under
the action of a local memoryless noise (specifically we consider the case of a
Markovian amplitude-damping channel). This is analytically proven after
deriving in a c... | 1105.5551v3 |
2011-06-01 | Indirect stabilization of weakly coupled systems with hybrid boundary conditions | We investigate stability properties of indirectly damped systems of evolution
equations in Hilbert spaces, under new compatibility assumptions. We prove
polynomial decay for the energy of solutions and optimize our results by
interpolation techniques, obtaining a full range of power-like decay rates. In
particular, we ... | 1106.0263v2 |
2011-06-02 | Density response of a trapped Fermi gas: a crossover from the pair vibration mode to the Goldstone mode | We consider the density response of a trapped two-component Fermi gas.
Combining the Bogoliubov-deGennes method with the random phase approximation
allows the study of both collective and single particle excitations.
Calculating the density response across a wide range of interactions, we
observe a crossover from a wea... | 1106.0430v2 |
2011-06-07 | Electromagnetically induced transparency with Rydberg atoms | We present a theory of electromagnetically induced transparency in a cold
ensemble of strongly interacting Rydberg atoms. Long-range interactions between
the atoms constrain the medium to behave as a collection of superatoms, each
comprising a blockade volume that can accommodate at most one Rydberg
excitation. The pro... | 1106.1360v2 |
2011-06-10 | Discrete-time quadrature feedback cooling of a radio-frequency mechanical resonator | We have employed a feedback cooling scheme, which combines high-frequency
mixing with digital signal processing. The frequency and damping rate of a 2
MHz micromechanical resonator embedded in a dc SQUID are adjusted with the
feedback, and active cooling to a temperature of 14.3 mK is demonstrated. This
technique can b... | 1106.2106v1 |
2011-06-22 | Magnetic excitations in iron pnictides | Spin wave dispersion and damping are investigated in the metallic SDW state
of different itinerant electron models including a small interlayer hopping.
Magnetic excitations in iron pnictides are shown to be well understood in terms
of physical mechanisms characteristic of metallic magnets, such as
carrier-induced ferr... | 1106.4421v1 |
2011-06-22 | Storing light as a mechanical excitation in a silica optomechanical resonator | We report the experimental demonstration of optomechanical light storage in a
silica resonator. We use writing and readout laser pulses tuned to one
mechanical frequency below an optical cavity resonance to control the coupling
between the mechanical displacement and the optical field at the cavity
resonance. The writi... | 1106.4512v1 |
2011-07-18 | Quantum gravity stability of isotropy in homogeneous cosmology | It has been shown that anisotropy of homogeneous spacetime described by the
general Kasner metric can be damped by quantum fluctuations coming from
perturbative quantum gravity in one-loop approximation. Also, a formal
argument, not limited to one-loop approximation, is put forward in favor of
stability of isotropy in ... | 1107.3468v4 |
2011-07-19 | Calculating a maximizer for quantum mutual information | We obtain a maximizer for the quantum mutual information for classical
information sent over the quantum qubit amplitude damping channel. This is
achieved by limiting the ensemble of input states to antipodal states, in the
calculation of the product-state capacity for the channel, the resulting
maximizing ensemble con... | 1107.3741v1 |
2011-07-19 | Damping of Bloch oscillations in the Hubbard model | Using nonequilibrium dynamical mean-field theory, we study the isolated
Hubbard model in a static electric field in the limit of weak interactions.
Linear response behavior is established at long times, but only if the
interaction exceeds a critical value, below which the system exhibits an
AC-type response with Bloch ... | 1107.3830v1 |
2011-07-20 | Fractional Equations of Kicked Systems and Discrete Maps | Starting from kicked equations of motion with derivatives of non-integer
orders, we obtain "fractional" discrete maps. These maps are generalizations of
well-known universal, standard, dissipative, kicked damped rotator maps. The
main property of the suggested fractional maps is a long-term memory. The
memory effects i... | 1107.3953v1 |
2011-07-21 | Averaging approximation to singularly perturbed nonlinear stochastic wave equations | An averaging method is applied to derive effective approximation to the
following singularly perturbed nonlinear stochastic damped wave equation \nu
u_{tt}+u_t=\D u+f(u)+\nu^\alpha\dot{W} on an open bounded domain
$D\subset\R^n$\,, $1\leq n\leq 3$\,. Here $\nu>0$ is a small parameter
characterising the singular perturb... | 1107.4184v1 |
2011-08-03 | Parametric amplification of magnetoplasmons in semiconductor quantum dots | We show that the magnetoplasmon collective modes in quasi-two-dimensional
semiconductor quantum dots can be parametrically amplified by periodically
modulating the magnetic field perpendicular to the nanostructure. The two
magnetoplasmon modes are excited and amplified simultaneously, leading to an
exponential growth o... | 1108.0891v3 |
2011-08-09 | Beam-beam studies for the High-Energy LHC | LHC upgrades are being considered both towards higher luminosity (HL-LHC) and
towards higher energy (HE-LHC). In this paper we report initial studies of the
beam-beam effects in the HE-LHC [1]. The HE-LHC aims at beam energies of 16.5
TeV, where the transverse emittance decreases due to synchrotron radiation with
a 2-h... | 1108.1871v1 |
2011-08-10 | Protecting entangled states of two ions by engineering reservoir | We present a proposal for realizing local decoherence-free evolution of given
entangled states of two two-level (TL) ions. For two TL ions coupled to a
single heavily damped cavity, we can use engineering reservoir scheme to obtain
a decoherence-free subspace which can be nonadiabatically controlled by the
system and r... | 1108.2186v1 |
2011-08-11 | Weak Primordial Magnetic Fields and Anisotropies in the Cosmic Microwave Background Radiation | It is shown that small-scale magnetic fields present before recombination
induce baryonic density inhomogeneities of appreciable magnitude. The presence
of such inhomogeneities changes the ionization history of the Universe, which
in turn decreases the angular scale of the Doppler peaks and increases Silk
damping by ph... | 1108.2517v1 |
2011-08-13 | Demonstration of K-Kbar, B-Bbar, and D-Dbar Transitions with a Pair of Coupled Pendula | A setup of two coupled and damped pendula is used to demonstrate the main
features of transitions beween neutral K, D, B mesons and their respective
antiparticles, including CP violation in K Kbar transitions. The transitions
are described by two-state Schr\"odinger equations. Since the real parts of
their solutions ob... | 1108.2772v2 |
2011-08-15 | Structural transitions in hypersphere fluids: predictions of Kirkwood's approximation | We use an analytic criterion for vanishing of exponential damping of
correlations developed previously (Piasecki et al, J. Chem. Phys., 133, 164507,
2010) to determine the threshold volume fractions for structural transitions in
hard sphere systems in dimensions D=3,4,5 and 6, proceeding from the YBG
hierarchy and usin... | 1108.2919v1 |
2011-08-15 | Directed transport in equilibrium : analysis of the dimer model with inertial terms | We have previously shown an analysis of our dimer model in the over-damped
regime to show directed transport in equilibrium. Here we analyze the full
model with inertial terms present to establish the same result. First we derive
the Fokker-Planck equation for the system following a Galilean transformation
to show that... | 1108.2927v1 |
2011-09-01 | Double adiabatic theory of collisionless geodesic acoustic modes in tokamaks | Collisionless geodesic acoustic modes in tokamaks being supersonic for large
"safety factor" q, the CGL (G. Chew, M. Goldberger, F. Low, 1956)1
double-adiabatic fluid closure is applied to formulate a theory for these
modes. The basic linear normal mode is obtained. External means to drive these
modes at resonance, as ... | 1109.0057v1 |
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