publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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1992-12-14 | Microscopic Origin of Quantum Chaos in Rotational Damping | The rotational spectrum of $^{168}$Yb is calculated diagonalizing different
effective interactions within the basis of unperturbed rotational bands
provided by the cranked shell model. A transition between order and chaos
taking place in the energy region between 1 and 2 MeV above the yrast line is
observed, associated... | 9212005v1 |
1996-12-17 | Damping mechanisms of the Delta resonance in nuclei | The damping mechanisms of the Delta(1232) resonance in nuclei are studied by
analyzing the quasi-free decay reactions 12C(pi+,pi+ p)11B and 12C(3He,t pi+
p)11B and the 2p emission reactions 12C(pi+,pp)10B and 12C(3He,t pp)10B. The
coincidence cross sections are calculated within the framework of the
isobar-hole model. ... | 9612046v1 |
1997-11-08 | Cooperative damping mechanism of the resonance in the nuclear photoabsorption | We propose a resonance damping mechanism to explain the disappearance of the
peaks around the position of the resonances higher than the $\Delta$ resonance
in the nuclear photoabsorption. This phenomenon is understood by taking into
account the cooperative effect of the collision broadening of $\Delta$ and
$N^{*}$, the... | 9711017v4 |
1998-05-27 | Collisional Damping of Nuclear Collective Vibrations in a Non-Markovian Transport Approach | A detailed derivation of the collisional widths of collective vibrations is
presented in both quantal and semi-classical frameworks by considering the
linearized limits of the extended TDHF and the BUU model with a non-Markovian
binary collision term. Damping widths of giant dipole and giant quadrupole
excitations are ... | 9805050v1 |
1999-07-06 | Probing the width of compound states with rotational gamma rays | The intrinsic width of (multiparticle-multihole) compound states is an
elusive quantity, of difficult direct access, as it is masked by damping
mechanisms which control the collective response of nuclei. Through microscopic
cranked shell model calculations, it is found that the strength function
associated with two-dim... | 9907016v1 |
1999-07-09 | Color plasma oscillation in strangelets | The dispersion relation and damping rate of longitudinal color plasmons in
finite strange quark matter (strangelets) are evaluated in the limits of weak
coupling, low temperature, and long wavelength. The property of the QCD vacuum
surrounding a strangelet makes the frequency of the plasmons nearly the same as
the colo... | 9907039v1 |
1999-09-21 | On the Collisional Damping of Giant Dipole Resonance | Collisional damping widths of giant dipole excitations are calculated in
Thomas-Fermi approximation by employing the microscopic in-medium
cross-sections of Li and Machleidt and the phenomenological Gogny force. The
results obtained in both calculations compare well, but account for about
25-35% of the observed widths ... | 9909057v1 |
2000-01-09 | Strongly damped nuclear collisions: zero or first sound ? | The relaxation of the collective quadrupole motion in the initial stage of a
central heavy ion collision at beam energies $E_{lab}=5\div20$ AMeV is studied
within a microscopic kinetic transport model. The damping rate is shown to be a
non-monotonic function of E_{lab} for a given pair of colliding nuclei. This
fact is... | 0001016v1 |
2002-11-18 | Collision damping in the pi 3He -> d'N reaction near the threshold | We present a simple quantum mechanical model exploiting the optical potential
approach for the description of collision damping in the reaction pi 3He -> d'N
near the threshold, which recently has been measured at TRIUMF. The influence
of the open d'N -> NNN channel is taken into account. It leads to a suppression
fact... | 0211050v1 |
2003-03-14 | Pion damping width from SU(2) x SU(2) NJL model | Within the framework of the NJL model, we investigate the modification of the
pion damping width in a hot pion gas for temperatures ranging from 0 to 180
MeV. The pion is found to broaden noticeably at T > 60 MeV. Near the chiral
phase transition T ~ 180 MeV, the pion width is saturated and amounts to 70
MeV. The main ... | 0303034v1 |
2004-06-09 | Damped collective motion of isolated many body systems within a variational approach to functional integrals | Two improvements with respect to previous formulations are presented for the
calculation of the partition function $\mathcal{Z}$ of small, isolated and
interacting many body systems. By including anharmonicities and employing a
variational approach quantum effects can be treated even at very low
temperatures. A method ... | 0406025v1 |
2004-07-26 | Damped collective motion of many body systems: A variational approach to the quantal decay rate | We address the problem of collective motion across a barrier like encountered
in fission. A formula for the quantal decay rate is derived which bases on a
recently developed variational approach for functional integrals. This formula
can be applied to low temperatures that have not been accessible within the
former PSP... | 0407092v2 |
1997-11-15 | Fluctuational phase-flip transitions in parametrically pumped oscillators | We analyze the rates of noise-induced transitions between period-two
attractors. The model investigated is an underdamped oscillator parametrically
driven by a field at nearly twice the oscillator eigenfrequency. The activation
energy of the transitions is analyzed as a function of the frequency detuning
and field ampl... | 9711014v1 |
1999-05-31 | Collisionless Damping of Low-Frequency Magnetosonic Pulses in a Two-Ion-Species Plasma | Low-frequency mangnetosonic pulses in a two-ion-species plasma are studied
theoretically and by simulation with a one-dimensional electromagnetic
simulation code based on a three-fluid model, with particular attention to the
dynamics of minority heavy ions. It is found that heavy ions can gain some
energy from the puls... | 9905059v1 |
2000-10-17 | Bunch Length Measurements at the ATF Damping Ring in April 2000 | This report presents bunch length and energy spread measurements performed in
April 2000 at the ATF Damping Ring, at KEK. Measurements were performed with
the beam on and then off the linear (difference) coupling resonance. Due to
strong intra-beam scattering in the ATF ring, the results depended strongly on
the coupli... | 0010043v1 |
2000-12-21 | Phase transition in the collisionless regime for wave-particle interaction | Gibbs statistical mechanics is derived for the Hamiltonian system coupling
self-consistently a wave to N particles. This identifies Landau damping with a
regime where a second order phase transition occurs. For nonequilibrium initial
data with warm particles, a critical initial wave intensity is found: above it,
thermo... | 0012053v1 |
2001-09-25 | Creep and Mechanical Oscillator Damping | Although "friction" is included in many models of oscillator damping,
including viscous ones applied to the pendulum; they "miss the mark" with
regard to a conceptual understanding of the mechanisms responsible for energy
loss. The theory of the present paper corrects some of these misunderstandings
by considering the ... | 0109067v1 |
2001-11-06 | Electromagnetic induction and damping - quantitative experiments using PC interface | A bar magnet, attached to an oscillating system, passes through a coil
periodically, generating a series of emf pulses. A novel method is described
for the quantitative verification of Faraday's law which eliminates all errors
associated with angular measurements, thereby revealing delicate features of
the underlying m... | 0111016v1 |
2003-08-31 | Effects of Bulk Viscosity in Non-linear Bubble Dynamics | The non-linear bubble dynamics equations in a compressible liquid have been
modified considering the effects of compressibility of both the liquid and the
gas at the bubble interface. A new bubble boundary equation has been derived,
which includes a new term resulted from the liquid bulk viscosity effects. The
influenc... | 0309012v1 |
2004-04-30 | On violation of the Robinson's damping criterion and enhanced cooling of ion, electron and muon beams in storage rings | Limits of applicability of the Robinson's damping criterion and the problem
of enhanced cooling of particle beams in storage rings beyond the criterion are
discussed. | 0404142v6 |
2004-12-28 | Electron Bernstein waves in spherical tokamak plasmas with "magnetic wells" | In addition to traditional regimes with monotonously increasing magnetic
field, regimes with "magnetic wells" also occur in spherical tokamaks (STs).
The magnetic field profile inversion modifies significantly the whole picture
of the wave propagation and damping. Since the magnetic wells may become quite
common with f... | 0412173v1 |
2005-02-10 | Modulational instabilities in Josephson oscillations of elongated coupled condensates | We study the Josephson oscillations of two coupled elongated condensates.
Linearized calculations show that the oscillating mode uniform over the length
of the condensates (uniform Josephson mode) is unstable : modes of non zero
longitudinal momentum grow exponentially. In the limit of strong atom
interactions, we give... | 0502050v3 |
2005-08-16 | Creep-Enhanced Low-Frequency Sensitivity of Seismometers | The frequency response of a seismometer is typically assumed to be the
textbook case of a viscous damped, simple harmonic oscillator. Real mechanical
oscillators are not ideal, and the damping at low frequencies, due to internal
friction, is presently too poorly understood to describe from first principles.
Even if the... | 0508105v1 |
2006-06-22 | Looking for a time independent Hamiltonian of a dynamical system | In this paper we introduce a method for finding a time independent
Hamiltonian of a given dynamical system by canonoid transformation. We also
find a condition that the system should satisfy to have an equivalent time
independent formulation. We study the example of damped oscillator and give the
new time independent H... | 0606197v2 |
1996-02-27 | Effects of Loss and Decoherence on a Simple Quantum Computer | We investigate the impact of loss (amplitude damping) and decoherence (phase
damping) on the performance of a simple quantum computer which solves the
one-bit Deutsch problem. The components of this machine are beamsplitters and
nonlinear optical Kerr cells, but errors primarily originate from the latter.
We develop mo... | 9602018v1 |
1996-11-25 | The Quantum state diffusion model and the driven damped nonlinear oscillator | We consider a driven damped anharmonic oscillator which classically leads to
a bistable steady state and to hysteresis. The quantum counterpart for this
system has an exact analytical solution in the steady state which does not
display any bistability or hysteresis. We use quantum state diffusion theory to
describe thi... | 9611044v1 |
1997-12-02 | Prevention of dissipation with two particles | An error prevention procedure based on two-particle encoding is proposed for
protecting an arbitrary unknown quantum state from dissipation, such as phase
damping and amplitude damping. The schemes, which exhibits manifestation of the
quantum Zeno effect, is effective whether quantum bits are decohered
independently or... | 9712005v1 |
1998-02-23 | Caldirola-Kanai Oscillator in Classical Formulation of Quantum Mechanics | The quadrature distribution for the quantum damped oscillator is introduced
in the framework of the formulation of quantum mechanics based on the
tomography scheme. The probability distribution for the coherent and Fock
states of the damped oscillator is expressed explicitly in terms of Gaussian
and Hermite polynomials... | 9802057v1 |
1999-03-22 | Decoherence - Fluctuation Relation and Measurement Noise | We discuss fluctuations in the measurement process and how these fluctuations
are related to the dissipational parameter characterising quantum damping or
decoherence. On the example of the measuring current of the variable-barrier or
QPC problem we show there is an extra noise or fluctuation connected with the
possibl... | 9903072v1 |
1999-07-27 | Nonclassical correlations in damped N-solitons | The quantum statistics of damped higher-order optical solitons are analyzed
numerically, using cumulant-expansion techniques in Gaussian approximation. A
detailed analysis of nonclassical properties in both the time and the frequency
domain is given, with special emphasis on the role of absorption. Highly
nonclassical ... | 9907090v2 |
2001-01-08 | Cavity-damping-induced transitions in a driven atom-cavity system | We investigate the fluorescence spectrum of a two-level atom in a cavity when
the atom is driven by a classical field. We show that forbidden dipole
transitions in the Jaynes-Cummings Ladder structure are induced in the presence
of the cavity damping, which deteriorates the degree of otherwise perfect
destructive inter... | 0101036v1 |
2001-06-09 | Squeezing enhancement by damping in a driven atom-cavity system | In a driven atom-cavity coupled system in which the two-level atom is driven
by a classical field, the cavity mode which should be in a coherent state in
the absence of its reservoir, can be squeezed by coupling to its reservoir. The
squeezing effect is enhanced as the damping rate of the cavity is increased to
some ex... | 0106054v1 |
2001-08-01 | Decoherence-induced wave packet splitting | We provide an intuitive interpretation of the optical Stern-Gerlach effect
(OSGE) in the dressed-state point of view. We also analyze the effect of atomic
damping in an experiment on the OSGE. We show that the atomic damping also
causes the wave packet splitting, in a non-mechanical fashion, as opposed to
the coherent ... | 0108005v1 |
2001-08-11 | A Canonical Approach to the Quantization of the Damped Harmonic Oscillator | We provide a new canonical approach for studying the quantum mechanical
damped harmonic oscillator based on the doubling of degrees of freedom
approach. Explicit expressions for Lagrangians of the elementary modes of the
problem, characterising both forward and backward time propagations are given.
A Hamiltonian anal... | 0108055v2 |
2002-05-09 | Implementation of quantum maps by programmable quantum processors | A quantum processor is a device with a data register and a program register.
The input to the program register determines the operation, which is a
completely positive linear map, that will be performed on the state in the data
register. We develop a mathematical description for these devices, and apply it
to several d... | 0205050v1 |
2002-08-28 | Damped Quantum Interference using Stochastic Calculus | It is shown how the phase-damping master equation, either in Markovian and
nonMarkovian regimes, can be obtained as an averaged random unitary evolution.
This, apart from offering a common mathematical setup for both regimes, enables
us to solve this equation in a straightforward manner just by solving the
Schrodinger ... | 0208176v1 |
2002-10-31 | Quantum Markov Channels for Qubits | We examine stochastic maps in the context of quantum optics. Making use of
the master equation, the damping basis, and the Bloch picture we calculate a
non-unital, completely positive, trace-preserving map with unequal damping
eigenvalues. This results in what we call the squeezed vacuum channel. A
geometrical picture ... | 0211001v1 |
2003-01-17 | Concurrence and foliations induced by some 1-qubit channels | We start with a short introduction to the roof concept. An elementary
discussion of phase-damping channels shows the role of anti-linear operators in
representing their concurrence. A general expression for some concurrences is
derived. We apply it to 1-qubit channels of length two, getting induced
foliations of the st... | 0301088v1 |
2003-05-19 | Statistical Effects in the Multistream Model for Quantum Plasmas | A statistical multistream description of quantum plasmas is formulated, using
the Wigner-Poisson system as dynamical equations. A linear stability analysis
of this system is carried out, and it is shown that a Landau-like damping of
plane wave perturbations occurs due to the broadening of the background Wigner
function... | 0305102v1 |
2003-06-28 | Misbelief and misunderstandings on the non--Markovian dynamics of a damped harmonic oscillator | We use the exact solution for the damped harmonic oscillator to discuss some
relevant aspects of its open dynamics often mislead or misunderstood. We
compare two different approximations both referred to as Rotating Wave
Approximation. Using a specific example, we clarify some issues related to
non--Markovian dynamics,... | 0306193v3 |
2003-11-26 | Effective damping in the Raman cooling of trapped ions | We present a method of treating the interaction of a single three-level ion
with two laser beams. The idea is to apply a unitary transformation such that
the exact transformed Hamiltonian has one of the three levels decoupled for all
values of the detunings. When one takes into account damping, the evolution of
the sys... | 0311183v1 |
2004-06-20 | Entanglement-assisted classical information capacity of the amplitude damping channel | In this paper, we calculate the entanglement-assisted classical information
capacity of amplitude damping channel and compare it with the particular mutual
information which is considered as the entanglement-assisted classical
information capacity of this channel in Ref. 6. It is shown that the difference
between them ... | 0406140v1 |
2004-08-13 | Decoherence versus Dynamical Casimir Effect | By means of two simple examples: phase and amplitude damping, the impact of
decoherence on the dynamical Casimir effect is investigated. Even without
dissipating energy (i.e., pure phase damping), the amount of created particles
can be diminished significantly via the coupling to the environment (reservoir
theory) indu... | 0408087v2 |
2004-10-11 | Quantizing the damped harmonic oscillator | We consider the Fermi quantization of the classical damped harmonic
oscillator (dho). In past work on the subject, authors double the phase space
of the dho in order to close the system at each moment in time. For an
infinite-dimensional phase space, this method requires one to construct a
representation of the CAR alg... | 0410078v1 |
2004-11-18 | Drastic effects of damping mechanisms on the third-order optical nonlinearity | We have investigated the optical response of superradiant atoms, which
undergoes three different damping mechanisms: radiative dissipation
($\gamma_r$), dephasing ($\gamma_d$), and nonradiative dissipation
($\gamma_n$). Whereas the roles of $\gamma_d$ and $\gamma_n$ are equivalent in
the linear susceptibility, the thir... | 0411129v1 |
2005-01-19 | Stabilizing an atom laser using spatially selective pumping and feedback | We perform a comprehensive study of stability of a pumped atom laser in the
presence of pumping, damping and outcoupling. We also introduce a realistic
feedback scheme to improve stability by extracting energy from the condensate
and determine its effectiveness. We find that while the feedback scheme is
highly efficien... | 0501101v1 |
2005-06-11 | Quantum damped oscillator II: Bateman's Hamiltonian vs. 2D Parabolic Potential Barrier | We show that quantum Bateman's system which arises in the quantization of a
damped harmonic oscillator is equivalent to a quantum problem with 2D parabolic
potential barrier known also as 2D inverted isotropic oscillator. It turns out
that this system displays the family of complex eigenvalues corresponding to
the pole... | 0506091v1 |
2005-06-27 | Entanglement of pair cat states and teleportation | The entanglement of pair cat states in the phase damping channel is studied
by employing the relative entropy of entanglement. It is shown that the pair
cat states can always be distillable in the phase damping channel. Furthermore,
we analyze the fidelity of teleportation for the pair cat states by using joint
measure... | 0506217v1 |
2005-07-21 | Entanglement versus mixedness for coupled qubits under a phase damping channel | Quantification of entanglement against mixing is given for a system of
coupled qubits under a phase damping channel. A family of pure initial joint
states is defined, ranging from pure separable states to maximally entangled
state. An ordering of entanglement measures is given for well defined initial
state amount of e... | 0507212v2 |
2005-10-20 | Overdamping by weakly coupled environments | A quantum system weakly interacting with a fast environment usually undergoes
a relaxation with complex frequencies whose imaginary parts are damping rates
quadratic in the coupling to the environment, in accord with Fermi's ``Golden
Rule''. We show for various models (spin damped by harmonic-oscillator or
random-matri... | 0510164v1 |
2006-06-07 | Comment on "Optimum Quantum Error Recovery using Semidefinite Programming" | In a recent paper ([1]=quant-ph/0606035) it is shown how the optimal recovery
operation in an error correction scheme can be considered as a semidefinite
program. As a possible future improvement it is noted that still better error
correction might be obtained by optimizing the encoding as well. In this note
we present... | 0606059v1 |
2006-09-19 | Quantum master equations from classical Lagrangians with two stochastic forces | We show how a large family of master equations, describing quantum Brownian
motion of a harmonic oscillator with translationally invariant damping, can be
derived within a phenomenological approach, based on the assumption that an
environment can be simulated by two classical stochastic forces. This family is
determine... | 0609144v3 |
2006-10-16 | Local noise can enhance entanglement teleportation | Recently we have considered two-qubit teleportation via mixed states of four
qubits and defined the generalized singlet fraction. For single-qubit
teleportation, Badziag {\em et al.} [Phys. Rev. A {\bf 62}, 012311 (2000)] and
Bandyopadhyay [Phys. Rev. A {\bf 65}, 022302 (2002)] have obtained a family of
entangled two-q... | 0610125v1 |
2006-11-24 | High fidelity transfer of an arbitrary quantum state between harmonic oscillators | It is shown that by switching a specific time-dependent interaction between a
harmonic oscillator and a transmission line (a waveguide, an optical fiber,
etc.) the quantum state of the oscillator can be transferred into that of
another oscillator coupled to the distant other end of the line, with a
fidelity that is ind... | 0611249v1 |
2006-12-05 | Quantum Brownian motion and the second law of thermodynamics | We consider a single harmonic oscillator coupled to a bath at zero
temperature. As is well known, the oscillator then has a higher average energy
than that given by its ground state. Here we show analytically that for a
damping model with arbitrarily discrete distribution of bath modes and damping
models with continuou... | 0612038v1 |
2007-05-08 | Minimal qudit code for a qubit in the phase-damping channel | Using the stabilizer formalism we construct the minimal code into a
D-dimensional Hilbert space (qudit) to protect a qubit against phase damping.
The effectiveness of this code is then studied by means of input-output
fidelity. | 0705.1099v3 |
2007-05-10 | Anomalous Diffusion of particles with inertia in external potentials | Recently a new type of Kramers-Fokker-Planck Equation has been proposed [R.
Friedrich et al. Phys. Rev. Lett. {\bf 96}, 230601 (2006)] describing anomalous
diffusion in external potentials. In the present paper the explicit cases of a
harmonic potential and a velocity-dependend damping are incorporated. Exact
relations... | 0705.1480v1 |
2007-05-31 | Stability of Solutions to Damped Equations with Negative Stiffness | This article concerns the stability of a model for mass-spring systems with
positive damping and negative stiness. It is well known that when the
coefficients are frozen in time the system is unstable. Here we find conditions
on the variable cofficients to prove stability. In particular, we disprove the
believe that if... | 0705.4670v1 |
2007-06-13 | Polymers in a vacuum | In a variety of situations, isolated polymer molecules are found in a vacuum
and here we examine their properties. Angular momentum conservation is shown to
significantly alter the average size of a chain and its conservation is only
broken slowly by thermal radiation. The time autocorrelation for monomer
position osci... | 0706.2001v1 |
2007-07-15 | Enhancement of Carrier Mobility in Semiconductor Nanostructures by Dielectric Engineering | We propose a technique for achieving large improvements in carrier mobilities
in 2- and 1-dimensional semiconductor nanostructures by modifying their
dielectric environments. We show that by coating the nanostructures with
high-$\kappa$ dielectrics, scattering from Coulombic impurities can be strongly
damped. Though sc... | 0707.2244v1 |
2007-07-23 | Causal vs. Noncausal Description of Nonlinear Wave Mixing; Resolving the Damping-Sign Controversy | Frequency-domain nonlinear wave mixing processes may be described either
using response functions whereby the signal is generated after all interactions
with the incoming fields, or in terms of scattering amplitudes where all fields
are treated symetrically with no specific time ordering. Closed Green's
function expres... | 0707.3458v1 |
2007-07-27 | Excitation of spin dynamics by spin-polarized current in vortex state disks | A spin-polarized current with the polarization perpendicular to the plane of
a vortex-state disk results in renormalization of the effective damping for a
given magnetization mode, and the effective damping becomes zero if the current
exceeds a threshold value. The lowest threshold current corresponds to the
lowest fre... | 0707.4128v1 |
2007-09-11 | Frequency and damping of the Scissors Mode of a Fermi gas | We calculate the frequency and damping of the scissors mode in a classical
gas as a function of temperature and coupling strength. Our results show good
agreement with the main features observed in recent measurements of the
scissors mode in an ultracold gas of $^6$Li atoms. The comparison between
theory and experiment... | 0709.1617v2 |
2007-09-14 | Strong collisionless damping of the low-velocity branch of electromagnetic wave in plasmas with Maxwellian-like electron velocity distribution function | After approximate replacing of Maxwellian distribution exponent with the
rational polynomial fraction we have obtained precise analytical expression for
and calculated the principal value of logarithmically divergent integral in the
electron wave dispersion equation. At the same time our calculations have shown
the pre... | 0709.2206v1 |
2007-09-14 | Plasmons, plasminos and Landau damping in a quasiparticle model of the quark-gluon plasma | A phenomenological quasiparticle model is surveyed for 2+1 quark flavors and
compared with recent lattice QCD results. Emphasis is devoted to the effects of
plasmons, plasminos and Landau damping. It is shown that thermodynamic bulk
quantities, known at zero chemical potential, can uniquely be mapped towards
nonzero ch... | 0709.2262v2 |
2007-10-04 | Activation of additional energy dissipation processes in the magnetization dynamics of epitaxial chromium dioxide films | The precessional magnetization dynamics of a chromium dioxide$(100)$ film is
examined in an all-optical pump-probe setup. The frequency dependence on the
external field is used to extract the uniaxial in-plane anisotropy constant.
The damping shows a strong dependence on the frequency, but also on the laser
pump fluenc... | 0710.0986v2 |
2007-10-24 | Spin dynamics of a trapped spin-1 Bose Gas above the Bose-Einstein transition temperature | We study collective spin oscillations in a spin-1 Bose gas above the
Bose-Einstein transition temperature. Starting from the Heisenberg equation of
motion, we derive a kinetic equation describing the dynamics of a thermal gas
with the spin-1 degree of freedom. Applying the moment method to the kinetic
equation, we stud... | 0710.4419v2 |
2007-11-19 | Nonlinear mode conversion in monodomain magnetic squares | Modifications of spatial distributions of dynamic magnetization corresponding
to spinwave eigenmodes of magnetic squares subjected to a strong microwave
excitation field have been studied experimentally and theoretically. We show
that an increase of the excitation power leads to a nonlinear generation of
long-wavelengt... | 0711.2872v1 |
2007-12-18 | Weibel Instabilities in Dense Quantum Plasmas | The quantum effect on the Weibel instability in an unmagnetized plasma is
presented. Our analysis shows that the quantum effect tends to stabilize the
Weibel instability in the hydrodynamic regime, whereas it produces a new
oscillatory instability in the kinetic regime. A novel effect the quantum
damping, which is asso... | 0712.2874v1 |
2008-01-18 | A qualitative perspective on the dynamics of a single-Cooper-pair box with a phase-damped cavity | In a recent paper Dajka, et.al., [J. Phys. A \textbf{40}, F879 (2007)]
predicted that some composite systems can be entangled forever even if coupled
with a thermal bath. We analyze the transient entanglement of a
single-Cooper-pair box biased by a classical voltage and irradiated by a
quantized field and find the unus... | 0801.2905v2 |
2008-02-28 | Current driven spin-wave instability triggered by the anomalous Hall effect | We studied the effect of strong electric current on spin waves interacting
relativistically with the current. The spin-wave spectrum is calculated at
arbitrary direction of the wave vector. It is shown that the alternating Hall
current generated by the alternating magnetic moment of the spin waves, reduces
the spin-wav... | 0802.4150v1 |
2008-03-31 | Spectral Modeling of Magnetohydrodynamic Turbulent Flows | We present a dynamical spectral model for Large Eddy Simulation of the
incompressible magnetohydrodynamic (MHD) equations based on the Eddy Damped
Quasi Normal Markovian approximation. This model extends classical spectral
Large Eddy Simulations for the Navier-Stokes equations to incorporate general
(non Kolmogorovian)... | 0803.4499v1 |
2008-04-10 | Trapped Phase-Segregated Bose-Fermi Mixtures and their Collective Excitations | Recent progress in the field of ultracold gases has allowed the creation of
phase-segregated Bose-Fermi systems. We present a theoretical study of their
collective excitations at zero temperature. As the fraction of fermion to boson
particle number increases, the collective mode frequencies take values between
those fo... | 0804.1759v2 |
2008-04-14 | Size dependence of multipolar plasmon resonance frequencies and damping rates in simple metal spherical nanoparticles | Multipolar plasmon oscillation frequencies and corresponding damping rates
for nanospheres formed of the simplest free-electron metals are studied. The
possibility of controlling plasmon features by choosing the size and dielectric
properties of the sphere surroundings is discussed. Optical properties of the
studied me... | 0804.2156v1 |
2008-06-05 | Thermally Assisted Spin Hall Effect | The spin polarized charge transport is systematically analyzed as a thermally
driven stochastic process. The approach is based on Kramers' equation
describing the semiclassical motion under the inclusion of stochastic and
damping forces. Due to the relativistic spin-orbit coupling the damping
experiences a relativistic... | 0806.0948v1 |
2008-06-13 | General Solution of the Quantum Damped Harmonic Oscillator II : Some Examples | In the preceding paper (arXiv : 0710.2724 [quant-ph]) we have constructed the
general solution for the master equation of quantum damped harmonic oscillator,
which is given by the complicated infinite series in the operator algebra
level. In this paper we give the explicit and compact forms to solutions
(density operat... | 0806.2169v1 |
2008-08-27 | Entanglement dynamics of two-qubit system in different types of noisy channels | In this paper, we study entanglement dynamics of a two-qubit extended
Werner-like state locally interacting with independent noisy channels, i.e.,
amplitude damping, phase damping and depolarizing channels. We show that the
purity of initial entangled state has direct impacts on the entanglement
robustness in each nois... | 0808.3690v1 |
2008-09-01 | Heatons induced by attosecond laser pulses | In this paper the dynamics of the interaction of attosecond laser pulses with
matter is investigated. It will be shown that the master equation: modified
Klein-Gordon equation describes the propagation of the heatons. Heatons are the
thermal wave packets. When the duration of the laser pulses is of the order of
attosec... | 0809.0204v1 |
2008-10-09 | Heat conduction in 2D strongly-coupled dusty plasmas | We perform non-equilibrium simulations to study heat conduction in
two-dimensional strongly coupled dusty plasmas. Temperature gradients are
established by heating one part of the otherwise equilibrium system to a higher
temperature. Heat conductivity is measured directly from the stationary
temperature profile and hea... | 0810.1623v2 |
2008-10-21 | Structurally damped plate and wave equations with random point force in arbitrary space dimensions | In this paper we consider structurally damped plate and wave equations with
point and distributed random forces. In order to treat space dimensions more
than one, we work in the setting of $L^q$--spaces with (possibly small)
$q\in(1,2)$. We establish existence, uniqueness and regularity of mild and weak
solutions to th... | 0810.3898v2 |
2008-11-05 | Spectral function and quasi-particle damping of interacting bosons in two dimensions | We employ the functional renormalization group to study dynamical properties
of the two-dimensional Bose gas. Our approach is free of infrared divergences,
which plague the usual diagrammatic approaches, and is consistent with the
exact Nepomnyashchy identity, which states that the anomalous self-energy
vanishes at zer... | 0811.0624v2 |
2008-11-13 | Existence of weak solutions to the Cauchy problem of a semilinear wave equation with supercritical interior source and damping | In this paper we show existence of finite energy solutions for the Cauchy
problem associated with a semilinear wave equation with interior damping and
supercritical source terms. The main contribution consists in dealing with
super-supercritical source terms (terms of the order of $|u|^p$ with $p\geq 5$
in $n=3$ dimens... | 0811.2151v1 |
2008-11-17 | Asymptotic stability and blow up for a semilinear damped wave equation with dynamic boundary conditions | In this paper we consider a multi-dimensional wave equation with dynamic
boundary conditions, related to the Kelvin-Voigt damping. Global existence and
asymptotic stability of solutions starting in a stable set are proved. Blow up
for solutions of the problem with linear dynamic boundary conditions with
initial data in... | 0811.2783v3 |
2008-11-19 | Weyl laws for partially open quantum maps | We study a toy model for "partially open" wave-mechanical system, like for
instance a dielectric micro-cavity, in the semiclassical limit where ray
dynamics is applicable. Our model is a quantized map on the 2-dimensional
torus, with an additional damping at each time step, resulting in a subunitary
propagator, or "dam... | 0811.3134v2 |
2008-12-16 | A picogram and nanometer scale photonic crystal opto-mechanical cavity | We describe the design, fabrication, and measurement of a cavity
opto-mechanical system consisting of two nanobeams of silicon nitride in the
near-field of each other, forming a so-called "zipper" cavity. A photonic
crystal patterning is applied to the nanobeams to localize optical and
mechanical energy to the same cub... | 0812.2953v1 |
2009-02-03 | Freezing of spin dynamics in underdoped cuprates | The Mori's memory function approach to spin dynamics in doped
antiferromagnetic insulator combined with the assumption of temperature
independent static spin correlations and constant collective mode damping leads
to w/T scaling in a broad range. The theory involving a nonuniversal scaling
parameter is used to analyze ... | 0902.0546v1 |
2009-02-12 | Discrete breathers in a forced-damped array of coupled pendula: Modeling, Computation and Experiment | In this work, we present a mechanical example of an experimental realization
of a stability reversal between on-site and inter-site centered localized
modes. A corresponding realization of a vanishing of the Peierls-Nabarro
barrier allows for an experimentally observed enhanced mobility of the
localized modes near the ... | 0902.2129v1 |
2009-03-08 | Enhancement of transmission rates in quantum memory channels with damping | We consider the transfer of quantum information down a single-mode quantum
transmission line. Such quantum channel is modeled as a damped harmonic
oscillator, the interaction between the information carriers -a train of N
qubits- and the oscillator being of the Jaynes-Cummings kind. Memory effects
appear if the state o... | 0903.1424v1 |
2009-03-15 | A variational approach to strongly damped wave equations | We discuss a Hilbert space method that allows to prove analytical
well-posedness of a class of linear strongly damped wave equations. The main
technical tool is a perturbation lemma for sesquilinear forms, which seems to
be new. In most common linear cases we can furthermore apply a recent result
due to Crouzeix--Haase... | 0903.2599v2 |
2009-03-30 | Damping of Exciton Rabi Rotations by Acoustic Phonons in Optically Excited InGaAs/GaAs Quantum Dots | We report experimental evidence identifying acoustic phonons as the principal
source of the excitation-induced-dephasing (EID) responsible for the intensity
damping of quantum dot excitonic Rabi rotations. The rate of EID is extracted
from temperature dependent Rabi rotation measurements of the ground-state
excitonic t... | 0903.5278v2 |
2009-05-13 | Landau damping | In this note we present the main results from the recent work
hal-00376547/arXiv:0904.2760, which for the first time establish Landau damping
in a nonlinear context. | 0905.2167v2 |
2009-05-13 | Amortissement Landau | Dans cette note nous pr\'esentons les principaux r\'esultats du r\'ecent
travail hal-00376547/arXiv:0904.2760, o\`u le ph\'enom\`ene d'amortissement
Landau est pour la premi\`ere fois \'etabli dans un contexte non lin\'eaire.
-----
In this note we present the main results from the recent work hal-00376547 /
arXiv:0... | 0905.2168v2 |
2009-06-27 | Effect of Bohm potential on a charged gas | Bohm's interpretation of Quantum Mechanics leads to the derivation of a
Quantum Kinetic Equation (QKE): in the present work, propagation of waves in
charged quantum gases is investigated starting from this QKE. Dispersion
relations are derived for fully and weakly degenerate fermions and bosons
(these latter above crit... | 0906.5061v1 |
2009-07-14 | Quantum Monty Hall problem under decoherence | We study the effect of decoherence on quantum Monty Hall problem under the
influence of amplitude damping, depolarizing and dephasing channels. It is
shown that under the effect of decoherence, there is a Nash equilibrium of the
game in case of depolarizing channel for Alice's quantum strategy. Where as in
case of deph... | 0907.2293v1 |
2009-08-31 | Rigorous Theory of Optical Trapping by an Optical Vortex Beam | We propose a rigorous theory for the optical trapping by optical vortices,
which is emerging as an important tool to trap mesoscopic particles. The common
perception is that the trapping is solely due to the gradient force, and may be
characterized by three real force constants. However, we show that the optical
vortex... | 0908.4504v1 |
2009-09-11 | Energy decay for the damped wave equation under a pressure condition | We establish the presence of a spectral gap near the real axis for the damped
wave equation on a manifold with negative curvature. This results holds under a
dynamical condition expressed by the negativity of a topological pressure with
respect to the geodesic flow. As an application, we show an exponential decay
of th... | 0909.2093v1 |
2009-09-12 | Signature of smooth transition from diabatic to adiabatic states in heavy-ion fusion reactions at deep subbarrier energies | We propose a novel extension of the standard coupled-channels framework for
heavy-ion reactions in order to analyze fusion reactions at deep subbarrier
incident energies. This extension simulates a smooth transition between the
diabatic two-body and the adiabatic one-body states. To this end, we damp
gradually the off-... | 0909.2298v1 |
2009-10-05 | Construction of quasi-periodic response solutions in forced strongly dissipative systems | We consider a class of ordinary differential equations describing
one-dimensional quasiperiodically forced systems in the presence of large
damping. We give a fully constructive proof of the existence of response
solutions, that is quasi-periodic solutions which have the same frequency
vector as the forcing. This requi... | 0910.0746v1 |
2009-10-14 | Plasmon-phonon Strongly-Coupled Mode in Epitaxial Graphene | We report the dispersion measurements, using angle-resolved reflection
electron-energy-loss-spectroscopy (AREELS), on two-dimensional (2D) plasmons in
single and multilayer graphene which couple strongly to surface optical phonon
(FK phonon) modes of silicon carbide substrate. The coupled modes show discrete
dispersion... | 0910.2735v1 |
2009-10-23 | Collective Enhancement and Suppression of Excitation Decay in Optical Lattices | We calculate radiative lifetimes of collective electronic excitations of
atoms in an infinite one dimensional lattice. The translational symmetry along
the lattice restricts the photon wave vector component parallel to the lattice
to the exciton wave number and thus the possible emission directions. The
resulting radia... | 0910.4501v1 |
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