publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2007-02-12 | Output radiation from a degenerate parametric oscillator | We study the squeezing as well as the statistical properties of the output
radiation from a degenerate parametric oscillator coupled to a squeezed vacuum
reservoir employing the stochastic differential equations associated with the
normal ordering. It is found that the degree of squeezing of the output
radiation is les... | 0702108v1 |
2007-03-20 | Decoherence of an $n$-qubit quantum memory | We analyze decoherence of a quantum register in the absence of non-local
operations i.e. of $n$ non-interacting qubits coupled to an environment. The
problem is solved in terms of a sum rule which implies linear scaling in the
number of qubits. Each term involves a single qubit and its entanglement with
the remaining o... | 0703190v1 |
1995-07-24 | Henon-Heiles Hamiltonian for Coupled Upper-Hybrid and Magnetoacoutic Waves in Magnetized Plasmas | We show that the coupled mode equations for the stationary propagation of
upper--hybrid and magnetoacoustic waves in magnetized electron--ion plasmas
with negative group dispersion can be exactly derived from the generalized
\Henon--Heiles Hamiltonian. The parameter regimes for the integrable cases of
the coupled mode ... | 9507005v1 |
1998-04-09 | The Davey Stewartson system and the Bäcklund Transformations | We consider the (coupled) Davey-Stewartson (DS) system and its B\"{a}cklund
transformations (BT). Relations among the DS system, the double
Kadomtsev-Petviashvili (KP) system and the Ablowitz-Ladik hierarchy (ALH) are
established. The DS hierarchy and the double KP system are equivalent. The ALH
is the BT of the DS sys... | 9804009v2 |
1999-05-10 | Coupled nonlinear Schrodinger equations with cubic-quintic nonlinearity: Integrability and soliton interaction in non-Kerr media | We propose an integrable system of coupled nonlinear Schrodinger equations
with cubic-quintic terms describing the effects of quintic nonlinearity on the
ultra-short optical soliton pulse propagation in non-Kerr media. Lax pair,
conserved quantities and exact soliton solutions for the proposed integrable
model are give... | 9905006v1 |
1999-08-09 | A Coupled AKNS-Kaup-Newell Soliton Hierarchy | A coupled AKNS-Kaup-Newell hierarchy of systems of soliton equations is
proposed in terms of hereditary symmetry operators resulted from Hamiltonian
pairs. Zero curvature representations and tri-Hamiltonian structures are
established for all coupled AKNS-Kaup-Newell systems in the hierarchy.
Therefore all systems have ... | 9908005v1 |
1995-11-21 | Synchronization in one-dimensional array of Josephson coupled thin layers | We obtain self-consistent macroscopic equations describing interlayer
Josephson effect and intralayer disequilibrium in one-dimensional array of
Josephson coupled layers. We show that ``nonequilibrium coupling'' can lead to
effective spatial and time synchronization and formation of coherent dynamic
resistive state (co... | 9511001v1 |
1996-05-11 | Coupling of Josephson flux-flow oscillators to an external RC load | We investigate by numerical simulations the behavior of the power dissipated
in a resistive load capacitively coupled to a Josephson flux flow oscillator
and compare the results to those obtained for a d.c. coupled purely resistive
load. Assuming realistic values for the parameters R and C, both in the high-
and in the... | 9605002v1 |
2007-04-05 | Circuit QED with a Flux Qubit Strongly Coupled to a Coplanar Transmission Line Resonator | We propose a scheme for circuit quantum electrodynamics with a
superconducting flux-qubit coupled to a high-Q coplanar resonator. Assuming
realistic circuit parameters we predict that it is possible to reach the strong
coupling regime. Routes to metrological applications, such as single photon
generation and quantum no... | 0704.0727v3 |
2007-04-06 | Coupling of whispering-gallery modes in size-mismatched microdisk photonic molecules | Mechanisms of whispering-gallery (WG) modes coupling in microdisk photonic
molecules (PMs) with slight and significant size mismatch are numerically
investigated. The results reveal two different scenarios of modes interaction
depending on the degree of this mismatch and offer new insight into how PM
parameters can be ... | 0704.0820v1 |
2007-04-06 | Gauge-Higgs Unification and LHC/ILC | In the gauge-Higgs unification scenario the 4D Higgs field is identified with
the zero mode of the extra-dimensional component of gauge potentials. The mass
of the Higgs particle in the unification in the Randall-Sundrum warped
spacetime is predicted to be in the range 100 GeV - 300 GeV. The WWZ gauge
couplings remains... | 0704.0883v1 |
2007-04-17 | Theoretical treatments of fusion processes in collisions of weakly bound nuclei | We review the theoretical methods to evaluate fusion cross sections in
collisions of weakly bound nuclei. We piont out that in such collisions the
coupling to the breakup channel leads to the appearance of different fusion
processes. The extentsion of the coupled-channel method to coupling with the
continuum is the mos... | 0704.2176v1 |
2007-04-22 | On some Hamiltonian structures of coupled Painlevé II systems in dimension four | We find and study a two-parameter family of coupled Painlev\'e II systems in
dimension four with affine Weyl group symmetry of several types. Moreover, we
find a three-parameter family of polynomial Hamiltonian systems in two
variables $t,s$. Setting $s=0$, we can obtain an autonomous version of the
coupled Painlev\'e ... | 0704.2863v2 |
2007-04-27 | Notes on Superconformal Chern-Simons-Matter Theories | The three dimensional N=2 supersymmetric Chern-Simons theory coupled to
matter fields, possibly deformed by a superpotential, give rise to a large
class of exactly conformal theories with Lagrangian descriptions. These
theories can be arbitrarily weakly coupled, and hence can be studied
perturbatively. We study the the... | 0704.3740v1 |
2007-04-30 | Effective tuning of exciton polarization splitting in coupled quantum dots | The polarization splitting of the exciton ground state in two laterally
coupled quantum dots under an in-plane electric field is investigated and its
effective tuning is designed. It is found that there are significant Stark
effect and anticrossing in energy levels. Due to coupling between inter- and
intra-dot states, ... | 0704.3871v2 |
2007-05-03 | Coupled spin-charge drift-diffusion equations for the Rashba model | Coupled spin-charge drift-diffusion equations are derived for a biased
two-dimensional electron gas with weak Rashba spin-orbit interaction. The basic
equations formally agree with recent results obtained for spin-orbit coupled
small polarons. It is shown that effects of an in-plane electric field on a
homogeneous spin... | 0705.0415v1 |
2007-05-03 | On the blow-up threshold for weakly coupled nonlinear Schroedinger equations | We study the Cauchy problem for a system of two coupled nonlinear focusing
Schroedinger equations arising in nonlinear optics. We discuss when the
solutions are global in time or blow-up in finite time. Some results, in
dependence of the data of the problem, are proved; in particular we give a
bound, depending on the c... | 0705.0491v1 |
2007-05-06 | On the gravitational coupling of Hadamard states | We study the constraints imposed by the Hadamard condition on the two-point
function of local states of a scalar quantum field conformally coupled to a
gravitational background. We propose a method to assign a stress tensor to the
state-dependent part of the two point function which arises as a conserved
tensor with an... | 0705.0787v1 |
2007-05-07 | Characteristics of Switchable Superconducting Flux Transformer with DC Superconducting Quantum Interference Device | We have investigated the flux transfer characteristics of a switchable flux
transformer comprising a superconducting loop and a DC superconducting quantum
interference device (DC-SQUID). This system can be used to couple multiple flux
qubits with a controllable coupling strength. Its characteristics were measured
using... | 0705.0841v1 |
2007-05-09 | Nonradiative DKR processes: revisiting the theory. II. Electron-vibrational mode coupling | We summarize a few proposals for mixing F center states through the mediation
of an appropriate symmetry-breaking vibrational mode. Electron-mode coupling
energies odd-order in the mode coordinates are characteristic of the
pseudo-Jahn-Teller mixing of nearly-degenerate opposite-parity electronic
states mediated by an ... | 0705.1361v1 |
2007-05-17 | The effective potential and resummation procedure to multidimensional complex cubic potentials for weak and strong-coupling | The method for the recursive calculation of the effective potential is
applied successfully in case of weak coupling limit (g tend to zero) to a
multidimensional complex cubic potential. In strong-coupling limit (g tend to
infinity), the result is resumed using the variational perturbation theory
(VPT). It is found tha... | 0705.2571v1 |
2007-05-19 | Three-dimensional instability of two nonlinearly coupled electromagnetic waves in a plasma | The three-dimensional instability of two coupled electromagnetic waves in an
unmagnetized plasma is investigated theoretically and numerically. In the
regime of two-plasmon decay, where one pump wave frequency is approximately
twice the electron plasma frequency, we find that the coupled pump waves give
rise to enhance... | 0705.2839v1 |
2007-05-24 | Thermal entanglement in a two-qutrit system with nonlinear coupling under nonuniform external magnetic field | We study the thermal entanglement of a 2-qutrit spin chain with nonlinear
coupling in the presence of nonuniform magnetic field. Thermal entanglement of
an arbitrary (finite dimensional) m-partite system vanishes at some finite
threshold temperature T_s. We investigate the dependence of T_s on the system's
parameters, ... | 0705.3568v2 |
2007-05-28 | Circumventing Astrophysical Bounds Upon PVLAS Experiment | We study the possibility of evading astrophysical bound on light
pseudoscalars. We argue that the solar bounds can be evaded if we have a
sufficiently strong self-coupling of the pseudoscalars. The required coupling
does not conflict with any known experimental bounds. We also show that it is
possible to find a couplin... | 0705.3967v2 |
2007-06-05 | Spin-charge-lattice coupling near the metal-insulator transition in Ca3Ru2O7 | We report x-ray scattering studies of the c-axis lattice parameter in
Ca3Ru2O7 as a function of temperature and magnetic field. These structural
studies complement published transport and magnetization data, and therefore
elucidate the spin-charge-lattice coupling near the metal-insulator transition.
Strong anisotropy ... | 0706.0689v1 |
2007-06-10 | Antiferromagnetism and Superconductivity in a model of Quasi 1D Organic Conductors | I apply a two-step renormalization group method to the study of the
competition between antiferromagnetism (AFM) and superconductivity in an
anisotropic 2D Hubbard model. I show that this simple model captures the
essentials of the ground-state phases of the quasi 1D organic conductors. As
found experimentally, the gro... | 0706.1364v1 |
2007-06-11 | Universality of traveling waves with QCD running coupling | ``Geometric scaling'', i.e. the dependence of DIS cross-sections on the ratio
Q/Q_S, where Q_S(Y) is the rapidity-dependent \saturation scale, can be
theoretically obtained from universal ``traveling wave'' solutions of the
nonlinear Balitsky-Kovchegov (BK) QCD evolution equation at fixed coupling. We
examine the simil... | 0706.1457v2 |
2007-06-13 | Failure of standard approximations of the exchange coupling in nanostructures | We calculate the exchange coupling for a double dot system using a novel,
numerically exact yet efficient technique, based on finite-element methods.
Specifically, we evaluate the exchange coupling both for a quasi-one and a
two-dimensional system, also including an applied magnetic field. Our numerical
results provide... | 0706.1859v2 |
2007-06-14 | Infrared Limit of Gluon Amplitudes at Strong Coupling | In this note, we propose that the infrared structure of gluon amplitudes at
strong coupling can be fully extracted from a local consideration near cusps.
This is consistent with field theory and correctly reproduces the infrared
divergences of the four-gluon amplitude at strong coupling calculated recently
by Alday and... | 0706.2015v3 |
2007-06-15 | Phase rigidity breaking in open Aharonov-Bohm ring coupled to a cantilever | The conductance and the transmittance phase shifts of a two-terminal
Aharonov-Bohm (AB) ring are analyzed in the presence of mechanical
displacements due to coupling to an external can- tilever. We show that phase
rigidity is broken, even in the linear response regime, by means of inelastic
scattering due to phonons. O... | 0706.2263v1 |
2007-06-26 | The coupling constants for an electroweak model with a $SU(4)_{PS} \otimes SU(4)_{EW}$ unification symmetry | We introduce the sequence of spontaneous symmetry breaking of a coupling
between Pati-Salam and electroweak symmetries $SU(4)_{PS} \otimes SU(4)_{EW}$
in order to establish a mathematically consistent relation among the coupling
constants at grand unification energy scale. With the values of baryon minus
lepton quantum... | 0706.3931v1 |
2007-07-01 | Sakai-Sugimoto Brane System at High Density | The D4-D8 brane system of Sakai-Sugimoto model at high quark density is
studied in the weak coupling regime. We show that the color superconducting
phase (for Nc~3) or the chiral density wave (for Nc->infinity) disappears at
very large chemical potential, or equivalently at very large compactified
dimension that the mo... | 0707.0101v3 |
2007-07-02 | Three-port beam splitters-combiners for interferometer applications | We derive generic phase and amplitude coupling relations for beam
splitters-combiners that couple a single port with three output ports or input
ports, respectively. We apply the coupling relations to a reflection grating
that serves as a coupler to a single-ended Fabry-Perot ring cavity. In the
impedance-matched case ... | 0707.0206v1 |
2007-07-03 | Vibrating Superconducting Island in a Josephson Junction | We consider a combined nanomechanical-supercondcuting device that allows the
Cooper pair tunneling to interfere with the mechanical motion of the middle
superconducting island. Coupling of mechanical oscillations of a
superconducting island between two superconducting leads to the electronic
tunneling generate a superc... | 0707.0495v2 |
2007-07-05 | Adiabatic elimination in quantum stochastic models | We consider a physical system with a coupling to bosonic reservoirs via a
quantum stochastic differential equation. We study the limit of this model as
the coupling strength tends to infinity. We show that in this limit the
solution to the quantum stochastic differential equation converges strongly to
the solution of a... | 0707.0686v4 |
2007-07-05 | Solitons in interacting Dicke models of coupled cavities with two-level systems | We consider an array of coupled optical cavities, each containing a
multi-atom ensemble. We show that the nonlinearity inherent in the cooperative
dynamics of the atoms in each ensemble coupled to the respective cavity field
allows for the formation of solitary waves. Such a prediction can be tested in
state-of-the-art... | 0707.0846v1 |
2007-07-12 | Non-perturbative Yukawa Couplings from String Instantons | Non-perturbative D-brane instantons can generate perturbatively absent though
phenomenologically relevant couplings for Type II orientifold compactifications
with D-branes. We discuss the generation of the perturbatively vanishing SU(5)
GUT Yukawa coupling of type 10 10 5_H. Moreover, for a simple globally
consistent i... | 0707.1871v1 |
2007-07-18 | Oscillation of spin polarization in a two-dimensional hole gas under a perpendicular magnetic field | Spin-charge coupling is studied for a strongly confined two-dimensional hole
gas subject to a perpendicular magnetic field. The study is based on
spin-charge coupled drift-diffusion equations derived from quantum-kinetic
equations in an exact manner. The spin-orbit interaction induces an extra
out-of-plane spin polariz... | 0707.2644v1 |
2007-07-22 | Effect of a fluctuating parameter mismatch in coupled Rössler systems | This paper is concerned with the effect of parameter fluctuations with a
characteristic waiting time in coupled R\"{o}ssler oscillators. We show that
the averaged error in synchronization that is introduced due to a fluctuating
parameter is proportional to the waiting time and the amplitude of the
fluctuations. It is a... | 0707.3249v1 |
2007-07-22 | Inverse scattering in multimode structures | We consider the inverse scattering problem associated with any number of
interacting modes in one-dimensional structures. The coupling between the modes
is contradirectional in addition to codirectional, and may be distributed
continuously or in discrete points. The local coupling as a function of
position is obtained ... | 0707.3252v1 |
2007-07-23 | Linear and nonlinear optical spectroscopy of a strongly-coupled microdisk-quantum dot system | A fiber taper waveguide is used to perform direct optical spectroscopy of a
microdisk-quantum-dot system, exciting the system through the photonic (light)
channel rather than the excitonic (matter) channel. Strong coupling, the regime
of coherent quantum interactions, is demonstrated through observation of vacuum
Rabi ... | 0707.3311v2 |
2007-07-25 | Exchange shift of stripe domains in antiferromagnetically coupled multilayers | Antiferromagnetically coupled multilayers with perpendicular anisotropy, as
[CoPt]/Ru, Co/Ir, Fe/Au, display ferromagnetic stripe phases as the ground
states. It is theoretically shown that the antiferromagnetic interlayer
exchange causes a relative shift of domains in adjacent layers. This ``exchange
shift'' is respon... | 0707.3765v1 |
2007-07-30 | Temperature Dependence of Rashba Spin-orbit Coupling in Quantum Wells | We perform an all-optical spin-dynamic measurement of the Rashba spin-orbit
interaction in (110)-oriented GaAs/AlGaAs quantum wells. The crystallographic
direction of quantum confinement allows us to disentangle the contributions to
spin-orbit coupling from the structural inversion asymmetry (Rashba term) and
the bulk ... | 0707.4493v1 |
2007-07-31 | Giant magnon bound states from strongly coupled N=4 SYM | We calculate in a very simple way the spectrum of giant magnon bound states
at strong coupling in N=4 SYM, by utilizing the description of the field theory
vacuum in terms of a condensate of eigenvalues of commuting matrices. We
further show that these calculations can be understood in terms of the central
charge exten... | 0707.4669v1 |
2007-08-04 | Emergence of synchronization induced by the interplay between two prisoner's dilemma games with volunteering in small-world networks | We studied synchronization between prisoner's dilemma games with voluntary
participation in two Newman-Watts small-world networks. It was found that there
are three kinds of synchronization: partial phase synchronization, total phase
synchronization and complete synchronization, for varied coupling factors.
Besides, tw... | 0708.0612v2 |
2007-08-07 | Reliability of temporal coding on pulse-coupled networks of oscillators | We study the reliability of spike output in a general class of pulse-coupled
oscillators receiving a fluctuating input. Showing that this problem is
equivalent to noise-induced synchronization between identical networks of
oscillators, we employ the phase reduction method to analytically derive the
average Lyapunov exp... | 0708.0862v1 |
2007-08-12 | DGP Cosmology with a Non-Minimally Coupled Scalar Field on the Brane | We construct a DGP inspired braneworld scenario where a scalar field
non-minimally coupled to the induced Ricci curvature is present on the brane.
First we investigate the status of gravitational potential with non-minimal
coupling and observational constraints on this non-minimal model. Then we
further deepen the idea... | 0708.1611v1 |
2007-08-14 | Non-Minimal Inflation on the Warped DGP Brane | We construct an inflation model with inflaton non-minimally coupled to
gravity on a warped DGP brane. Using an exponential potential, we calculate
scalar power spectrum, spectral index and the running of the spectral index. We
show that for a suitable range of non-minimal coupling it is possible to exit
the inflationar... | 0708.1916v2 |
2007-08-15 | Non--Localizability of Electric Coupling and Gravitational Binding of Charged Objects | The energy--momentum tensor in general relativity contains only localized
contributions to the total energy--momentum. Here, we consider a static,
spherically symmetric object consisting of a charged perfect fluid. For this
object, the total gravitational mass contains a non--localizable contribution
of electric coupli... | 0708.2037v2 |
2007-08-18 | Synchronization in coupled phase oscillators | We make a short review about the synchronization in coupled phase oscillator
models. Next, we study the common-noise-induced synchronization among active
rotators. At an intermediate noise strength, the noise-induced synchronization
takes place most effectively, which is analogous to the stochastic resonance.
Finally, ... | 0708.2460v2 |
2007-08-19 | Coupling of electron rotation with spin in semiconductors | Account of an intrinsic spin-orbit coupling in the valence bands of common
semiconductors yields the scalar spin-orbit-rotation term in the effective-mass
Hamiltonian of the conduction-band electron. This result is obtained within the
multiband envelope function approximation. Fundamentally, the
spin-orbit-rotation cou... | 0708.2565v2 |
2007-08-27 | CP Asymmetries in Higgs decays to ZZ at the LHC | We examine the effect of a general HZZ coupling through a study of the Higgs
decay to leptons via Z bosons at the LHC. We discuss various methods for
placing limits on additional couplings, including measurement of the partial
width, threshold scans, and asymmetries constructed from angular observables.
We find that on... | 0708.3612v1 |
2007-08-27 | Diffusive-Ballistic Crossover and the Persistent Spin Helix | Conventional transport theory focuses on either the diffusive or ballistic
regimes and neglects the crossover region between the two. In the presence of
spin-orbit coupling, the transport equations are known only in the diffusive
regime, where the spin precession angle is small. In this paper, we develop a
semiclassica... | 0708.3618v1 |
2007-08-31 | ILC Sensitivity on Generic New Physics in Quartic Gauge Couplings | We investigate the potential of the ILC for measuring anomalous quartic gauge
couplings, both in production of three electroweak gauge bosons as well as in
vector boson scattering. Any new physics that could possibly couple to the
electroweak gauge bosons is classified according to its spin and isospin
quantum numbers ... | 0708.4383v1 |
2007-09-04 | Cluster Model for Near-barrier Fusion Induced by Weakly Bound and Halo Nuclei | The influence on the fusion process of coupling transfer/breakup channels is
investigated for the medium weight $^{6,7}$Li+$^{59}$Co systems in the vicinity
of the Coulomb barrier. Coupling effects are discussed within a comparison of
predictions of the Continuum Discretized Coupled-Channels model. Applications
to $^{6... | 0709.0439v1 |
2007-09-05 | Quantum Coherence Conservation by Growth in Environmental Dissipation Rate | Quantum coherence conservation is shown to be achieved by a very high rate of
dissipation of an environmental system coupled with a principal system. This
effect is not in the list of previously-known strategies of noise suppression,
such as Zeno effect, dynamical decoupling, quantum error correction code, and
decohere... | 0709.0562v2 |
2007-09-06 | Polaron tunneling dynamics in the DNA molecule | The formation of polaron and its migration in a DNA chain are studied within
a semiclassical Peyrard-Biship-Holstein polaron model. Comparing the energetics
of the polaron system found from the quantum chemical and semiclassical
calculations, we extract the charge-phonon coupling constant for poly DNA
sequences. The co... | 0709.0954v1 |
2007-09-07 | Spike synchronization of a chaotic array as a phase transition | We study how a coupled array of spiking chaotic systems synchronizes to an
external driving in a short time. Synchronization means spike separation at
adjacent sites much shorter than the average inter-spike interval; a local lack
of synchronization is called a defect. The system displays sudden spontaneous
defect disa... | 0709.1108v1 |
2007-09-11 | Bright continuous-variable entanglement from the quantum optical dimer | We show theoretically that two evanescently coupled $\chi^{(2)}$ second
harmonic generators inside a Fabry-Perot cavity provide a tunable source of
quadrature squeezed light, Einstein-Podolsky-Rosen correlations and quantum
entanglement. Unlike systems using coupled downconverters, second harmonic
generation has no osc... | 0709.1533v1 |
2007-09-12 | Quantitative 3w-Scanning Thermal Microscopy: Modelling the AC/DC coupling and the sample heat conduction | A way to increase the Scanning Thermal Microscope (SThM) sensitivity in the
harmonic 3w mode is to heat the probe with an AC current sufficiently high to
generate a coupling between the AC and the DC signals. We detail in this paper
how to properly take into account this coupling with a Wollaston-probe SThM. We
also sh... | 0709.1835v1 |
2007-09-12 | Gauge unification in noncommutative geometry | Gauge unification is widely considered to be a desirable feature for
extensions of the standard model. Unfortunately the standard model itself does
not exhibit a unification of its running gauge couplings but it is required by
grand unified theories as well as the noncommutative version of the standard
model [2].
We ... | 0709.1857v1 |
2007-09-13 | Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems | Based on spin-charge coupled drift-diffusion equations, which are derived
from kinetic equations for the spin-density matrix in a rigorous manner, the
electric-field-induced nonequilibrium spin polarization is treated for a
two-dimensional electron gas with both Rashba and Dresselhaus spin-orbit
coupling. Most emphasis... | 0709.2054v1 |
2007-09-13 | Bright branes for strongly coupled plasmas | We use holographic techniques to study photon production in a class of finite
temperature, strongly coupled, large-Nc SU(Nc) quark-gluon plasmas with Nf <<
Nc quark flavours. Our results are valid to leading order in the
electromagnetic coupling constant but non-perturbatively in the SU(Nc)
interactions. The spectral f... | 0709.2168v1 |
2007-09-24 | Controlled coupling of counterpropagating whispering-gallery modes by a single Rayleigh scatterer: a classical problem in a quantum optical light | We present experiments where a single subwavelength scatterer is used to
examine and control the back-scattering induced coupling between
counterpropagating high-Q modes of a microsphere resonator. Our measurements
reveal the standing wave character of the resulting symmetric and antisymmetric
eigenmodes, their unbalan... | 0709.3701v1 |
2007-09-28 | Isotopic shift in angle-resolved photoemission spectra of Bi2Sr2CaCu2O8 due to quadratic electron-phonon coupling | In connection with the experiment on oxygen isotope effect of Bi2Sr2CaCu2O8
with the angle-resolved photoemission spectroscopy (ARPES), we theoretically
study the isotope-induced band shift in ARPES by the Hartree-Fork and quantum
Monte Carlo methods. We find that this band shift can be clarified based on a
quadratical... | 0709.4530v1 |
2007-10-02 | Self-consistent theory of phonon renormalization and electron-phonon coupling near a 2D Kohn singularity | We show that the usual expression for evaluating electron-phonon coupling and
the phonon linewidth in 2D metals with a cylindrical Fermi surface cannot be
applied near the wave vector corresponding to the Kohn singularity. Instead,
the Dyson equation for phonons has to be solved self-consistently. If a
self-consistent ... | 0710.0661v1 |
2007-10-11 | Strong coupling expansion of Baxter equation in N=4 SYM | The anomalous dimensions of single-trace local Wilson operators with
covariant derivatives in maximally supersymmetric gauge theory are believed to
be generated from a deformed noncompact sl(2) Baxter equation. We perform a
systematic expansion of this equation at strong coupling in the
single-logarithmic limit of larg... | 0710.2294v1 |
2007-10-12 | Dimensional Reduction Applied to Non-Supersymmetric Theories | We consider regularisation of a Yang-Mills theory by Dimensional Reduction
(DRED). In particular, the anomalous dimensions of fermion masses and gauge
coupling are computed to four-loop order. We put special emphasis on the
treatment of evanescent couplings which appear when DRED is applied to
non-supersymmetric theori... | 0710.2490v1 |
2007-10-15 | Rescuing H -> bb in VBF at the LHC by requiring a central photon | The LHC potential for a measurement of the Higgs boson coupling to the b
quark in the standard model is not well established yet. We show that requiring
a large transverse momentum photon in the light Higgs boson production via
vector-boson fusion (with subsequent H->bb decay) could provide a further
handle on the Hbb ... | 0710.2809v1 |
2007-10-16 | Fano resonance in a two-level quantum dot side-coupled to leads | We theoretically study Fano resonance in a two-level quantum dot side-coupled
to two leads, which are connected by a direct channel. The resonance lineshape
is found to be deformed, from the conventional Fano form, by interlevel Coulomb
interaction and interlevel interference. We derive the connection between the
lines... | 0710.3045v1 |
2007-10-24 | Solution and Asymptotic Behavior for a Nonlocal Coupled System of Reaction-Diffusion | This paper concerns with existence, uniqueness and asymptotic behavior of the
solutions for a nonlocal coupled system of reaction-diffusion. We prove the
existence and uniqueness of weak solutions by the Faedo-Galerkin method and
exponential decay of solutions by the classic energy method. We improve the
results obtain... | 0710.4381v1 |
2007-11-03 | A coupled Volterra system and its exact solutions | A coupled Volterra system is proposed. The model can be considered as one of
the integrable discrete form of the coupled integrable KdV system which is a
significant physical model. Many types of cnoidal waves, positons, negatons
(solitons) and complexitons of the model are obtained by a simple rational
expansion metho... | 0711.0420v1 |
2007-11-03 | Bose-Fermi Equivalence in Three Dimensional Non-commutative Space-Time | We study the Fermionisation of Seiberg-Witten mapped action (to order
$\theta$) of the $\lambda\phi^{4}$ theory coupled minimally with U(1) gauge
field governed by Chern-Simon action. Starting from the corresponding partition
function we derive non-perturbatively (in coupling constant) the partition
function of the spi... | 0711.0431v2 |
2007-11-07 | Statistics of Resonances in a Semi-infinite Disordered Chain | We study the average density of resonances (DOR) for a semi-infinite
disordered chain, coupled to the outside world by a (semi-infinite) perfect
lead. A set of equations is derived, which provides the general framework for
calculating the average DOR, for an arbitrary disorder and coupling strength.
These general equat... | 0711.1040v1 |
2007-11-09 | Enhancing synchronization in complex networks of coupled phase oscillators | By a model of coupled phase oscillators, we show analytically how
synchronization in {\em non-identical} complex networks can be enhanced by
introducing a proper gradient into the couplings. It is found that, by pointing
the gradient from the large-degree to the small-degree nodes on each link,
increasing the gradient ... | 0711.1409v2 |
2007-11-09 | Persistent Current for a genus g=2 structure | We report the first calculation of persistent current in two coupled rings
which form a character ``8'' genus g=2 structure. We obtain an exact solution
for the persistent current and investigated the exact solution numerically. For
two large coupled rings with equal fluxes, we find that the persistent current
in the t... | 0711.1492v2 |
2007-11-14 | Electromagnetically induced transparency in two channels of a $Λ$ system | We show two channel electromagnetically induced transparency (EIT) spectra at
various optical power. The two channels are coupling field and probe field
absorption. It is shown that EIT width and intensity increases linearly with
pump power. A density matrix calculation is used to determine nature of EIT
spectra induce... | 0711.2232v1 |
2007-11-15 | Decoherence by a spin thermal bath: Role of the spin-spin interactions | We study the decoherence of two coupled spins that interact with a spin-bath
environment. It is shown that the connectivity and the coupling strength
between the spins in the environment are of crucial importance for the
decoherence of the central system. Changing the connectivity or coupling
strenghts changes the deco... | 0711.2483v1 |
2007-11-15 | Unitarity Bounds for New Physics from Axial Coupling at LHC | If a new massive vector boson with nonzero axial couplings to fermions will
be observed at LHC, then an upper limit on the scale of new physics could be
derived from unitarity of $\mathcal{S}$-matrix. The new physics will involve
either new massive fermions, or scalars, or even a strongly coupled sector. We
derive a mo... | 0711.2516v1 |
2007-11-27 | Exciton dephasing in quantum dots: Coupling to LO phonons via excited states | We have found a novel mechanism of spectral broadening and dephasing in
quantum dots (QDs) due to the coupling to longitudinal-optical (LO) phonons. In
theory, this mechanism comes into play only if the complete manifold of exciton
levels (including those in the wetting-layer continuum) is taken into account.
We demons... | 0711.4274v1 |
2007-11-27 | Absolute Continuity of the Integrated Density of States for the Almost Mathieu Operator with Non-Critical Coupling | We show that the integrated density of states of the almost Mathieu operator
is absolutely continuous if and only if the coupling is non-critical. We deduce
for subcritical coupling that the spectrum is purely absolutely continuous for
almost every phase, settling the measure-theoretical case of Problem 6 of Barry
Simo... | 0711.4291v1 |
2007-11-27 | A Simple Baryon Triality Model for Neutrino Masses | We make a simple ansatz for the supersymmetric lepton-number violating Yukawa
couplings, by relating them to the corresponding Higgs Yukawa couplings. This
reduces the free B$_3$ parameters from 36 to 6. We fit these parameters to
solve the solar and atmospheric neutrino anomalies in terms of neutrino
oscillations. The... | 0711.4315v1 |
2007-12-07 | First Calculation of Hyperon Axial Couplings from Lattice QCD | In this work, we report the first lattice calculation of hyperon axial
couplings, using the 2+1-flavor MILC configurations and domain-wall fermion
valence quarks. Both the $\Sigma$ and $\Xi$ axial couplings are computed for
the first time in lattice QCD. In particular we find that $g_{\Sigma\Sigma} =
0.450(21)_{\rm sta... | 0712.1214v1 |
2007-12-14 | Heralded generation of entanglement with coupled cavities | We propose a scheme to generate two-photon, two-atom, or atom-photon
entangledstates with a coupled system of two cavities. In our scheme, two
cavity photonsare exchanged by the direct inter-cavity coupling, while atoms in
the cavitiessimply play the role of generating and probing them. By virtue of
the highefficiency ... | 0712.2413v2 |
2007-12-17 | A Generalized Scaling Function for AdS/CFT | We study a refined large spin limit for twist operators in the sl(2) sector
of AdS/CFT. We derive a novel non-perturbative equation for the generalized
two-parameter scaling function associated to this limit, and analyze it at weak
coupling. It is expected to smoothly interpolate between weakly coupled gauge
theory and... | 0712.2743v2 |
2007-12-26 | Observation of all-optical bump-on-tail instability | We demonstrate an all-optical bump-on-tail instability by considering the
nonlinear interaction of two partially-coherent spatial beams. For weak wave
coupling, we observe momentum transfer with no variation in intensity. For
strong wave coupling, modulations appear in intensity and evidence appears for
wave (Langmuir)... | 0712.4128v1 |
2007-12-30 | Fundamental excitations in layered superconductors with long-range Josephson couplings | The present paper develops the ideas introduced in {\em cond-mat/0312673}.
The construction of a hybrid discrete-continuous model of layered
superconductors is briefly presented. The model bases on the classic
Lawrence-Doniach scenario with admitting, however, long-range interactions
between atomic planes. Moreover, ap... | 0801.0171v1 |
2008-01-03 | "Light from chaos" in two dimensions | We perform a Monte-Carlo study of the lattice two-dimensional gauged
XY-model. Our results confirm the strong-coupling expansion arguments that for
sufficiently small values of the spin-spin coupling the ``gauge symmetry
breaking" terms decouple and the long-distance physics is that of the unbroken
pure gauge theory. W... | 0801.0587v1 |
2008-01-07 | A New Methodology for Extraction of Dynamic Compact Thermal Models | An innovative and accurate dynamic Compact Thermal Model extraction method is
proposed for multi-chip power electronics systems. It accounts for thermal
coupling between multiple heat sources. Transient electro-thermal coupling can
easily be taken into account by system designers. The method is based on a
definition of... | 0801.1044v1 |
2008-01-08 | Optimal co-adapted coupling for the symmetric random walk on the hypercube | Let X and Y be two simple symmetric continuous-time random walks on the
vertices of the n-dimensional hypercube. We consider the class of co-adapted
couplings of these processes, and describe an intuitive coupling which is shown
to be the fastest in this class. | 0801.1220v2 |
2008-01-10 | A Lorentz Invariant Pairing Mechanism: Relativistic Cooper Pairs | We study a Lorentz invariant pairing mechanism that arises when two
relativistic spin-1/2 fermions are subjected to a Dirac string coupling. In the
weak coupling regime, we find remarkable analogies between this relativistic
bound system and the well known superconducting Cooper pair. As the coupling
strength is raised... | 0801.1615v1 |
2008-01-14 | Spin-Gravity Coupling | Mathisson's spin-gravity coupling and its Larmor-equivalent interaction,
namely, the spin-rotation coupling are discussed. The study of the latter leads
to a critical examination of the basic role of locality in relativistic
physics. The nonlocal theory of accelerated systems is outlined and some of its
implications ar... | 0801.2134v1 |
2008-01-18 | Synchronizing discrete-time neutrally stable linear systems via partial-state coupling | A basic result in synchronization of linear systems via output coupling is
presented. For identical discrete-time linear systems that are detectable from
their outputs and neutrally stable, it is shown that a linear output feedback
law exists under which the coupled systems globally asymptotically synchronize
for all f... | 0801.2945v2 |
2008-01-20 | Orbital magnetization and its effects in spin-chiral ferromagnetic kagome lattice in the general spin-coupling region | The orbital magnetization and its effects on the two-dimensional kagom\'{e}
lattice with spin anisotropies included in the general Hund's coupling region
have been theoretically studied. The results show that the strength of the
Hund's coupling, as well as the spin chirality, contributes to the orbital
magnetization $\... | 0801.3061v1 |
2008-01-21 | Synchronizing continuous-time neutrally stable linear systems via partial-state coupling | Synchronization of coupled continuous-time linear systems is studied in a
general setting. For identical neutrally-stable linear systems that are
detectable from their outputs, it is shown that a linear output feedback law
exists under which the coupled systems globally asymptotically synchronize
under all fixed (direc... | 0801.3185v1 |
2008-01-29 | Shear viscosity of boost invariant plasma at finite coupling | We discuss string theory alpha' corrections in the dual description of the
expanding boost invariant N=4 supersymmetric Yang-Mills plasma at strong
coupling. We compute finite 't Hooft coupling corrections to the shear
viscosity and find that it disagrees with the equilibrium correlation function
computations. We comme... | 0801.4421v2 |
2008-01-31 | Discrete symmetries of chaotic strings | Chaotic strings are particular classes of coupled map lattices that can serve
as models for vacuum fluctuations in stochastically quantized field theories.
They have been previously shown to distinguish standard model coupling
parameters as corresponding to states of strongest possible chaotic behaviour
and vanishing n... | 0801.4892v1 |
2008-01-31 | Non-adiabatic two-parameter charge and spin pumping in a quantum dot | We study DC charge and spin transport through a weakly coupled quantum dot,
driven by a non-adiabatic periodic change of system parameters. We generalize
the model of Tien and Gordon to simultaneously oscillating voltages and tunnel
couplings. When applying our general result to the two-parameter charge pumping
in quan... | 0801.4925v1 |
2008-02-03 | (Ga,Mn)As based superlattices and the search for antiferromagnetic interlayer coupling | Antiferromagnetic interlayer coupling in dilute magnetic semiconductor
superlattices could result in the realisation of large magnetoresistance
effects analogous to the giant magnetoresistance seen in metallic multilayer
structures. In this paper we use a mean-field theory of carrier induced
ferromagnetism to explore t... | 0802.0275v2 |
2008-02-06 | Synchronization between variable time delayed systems and cryptography | In this letter we consider a prototype model which is described as an
autonomous continuous time delayed differential equation with just one
variable. The chaos has been investigated with variable delay time and the
synchronization phenomenon is examined both numerically and analytically using
the Krasovskii-Lyapunov f... | 0802.0768v1 |
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