publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2007-10-04 | Thermodynamics of statistically interacting quantum gas in D dimensions | We present the exact thermodynamics (isochores, isotherms, isobars, response
functions) of a statistically interacting quantum gas in D dimensions. The
results in D=1 are those of the thermodynamic Bethe ansatz for the nonlinear
Schroedinger model, a gas with repulsive two-body contact potential. In all
dimensions the ... | 0710.1031v1 |
2007-10-05 | Renormalization group flow of quartic perturbations in graphene: Strong coupling and large-N limits | We explore the renormalization group flow of quartic perturbations in the
low-energy theory of graphene, in the strong Coulomb coupling and large-N
limits, where N is the number of fermion flavors. We compute the anomalous
dimensions of the quartic couplings u up to next-to-leading order in 1/N and
find both relevant a... | 0710.1315v2 |
2007-10-08 | Effective Coupling Constant in Renormalization Group for the Quantum Electrodynamics | Effective coupling constant in quantum electrodynamics is investigated. A
pole appears in the effective coupling constant for the space-like momentum if
it is calculated by perturbation. The pole can be eliminated by the analytic
regularization. For QED the effective coupling constant is written in terms of
the scale p... | 0710.1457v1 |
2007-10-15 | Intersubband spin-orbit coupling and spin splitting in symmetric quantum wells | In semiconductors with inversion asymmetry, spin-orbit coupling gives rise to
the well-known Dresselhaus and Rashba effects. If one considers quantum wells
with two or more conduction subbands, an additional, intersubband-induced
spin-orbit term appears whose strength is comparable to the Rashba coupling,
and which rem... | 0710.2866v1 |
2007-10-18 | Entanglement between charge qubits induced by a common dissipative environment | We study entanglement generation between two charge qubits due to the strong
coupling with a common bosonic environment (Ohmic bath). The coupling to the
boson bath is a source of both quantum noise (leading to decoherence) and an
indirect interaction between qubits. As a result, two effects compete as a
function of th... | 0710.3576v1 |
2007-10-19 | Evolution of coherence between the Jaynes - Cummings Eigenstates in the presence of repeated occupancy measurements: The case of resonant coupling | A two level system resonantly coupled to a single mode cavity field and
subject to ground state occupancy measurement like interaction is considered.
For this situation, the solution to the Lindblad master equation for the
density matrix is obtained with respect to the Jaynes Cummings eigenstate
representation. It is s... | 0710.3662v1 |
2007-10-23 | Tan(beta) enhanced Yukawa couplings for supersymmetric Higgs singlets at one loop | Extensions of the MSSM generically feature gauge singlet Higgs bosons. These
singlet Higgs bosons have tan(beta)-enhanced Yukawa couplings to down-type
quarks and leptons at the one-loop level. We present an effective Lagrangian
incorporating these Yukawa couplings and use it to study their effect on
singlet Higgs boso... | 0710.4281v1 |
2007-10-25 | Classical Renormalization of Codimension-two Brane Couplings | The curvature on codimension-two and higher branes is not regular for
arbitrary matter sources. Nevertheless, the low-energy theory for an observer
on such a brane should be well-defined and independent to any regularization
procedure. This is achieved via appropriate classical renormalization of the
brane couplings, a... | 0710.4598v1 |
2007-11-21 | Josephson Effect between Conventional and Rashba Superconductors | We study the Josephson effect between a conventional s-wave superconductor
and a non-centrosymmetric superconductor with Rashba spin-orbit coupling.
Rashba spin-orbit coupling affects the Josephson pair tunneling in a
characteristic way. The Josephson coupling can be decomposed into two parts, a
`spin-singlet-like' and... | 0711.3241v2 |
2007-11-30 | Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction | A model of non-local dilaton interactions, motivated by string duality
symmetries, is applied to a scenario of "coupled quintessence" in which the
dilaton dark energy is non-locally coupled to the dark-matter sources. It is
shown that the non-local effects tend to generate a backreaction which -- for
strong enough coup... | 0711.5022v1 |
2007-12-11 | Valley interference effects on a donor electron close to a Si/SiO2 interface | We analyze the effects of valley interference on the quantum control and
manipulation of an electron bound to a donor close to a Si/SiO2 interface as a
function of the valley-orbit coupling at the interface. We find that, for
finite valley-orbit coupling, the tunneling times involved in shuttling the
electron between t... | 0712.1823v1 |
2008-01-11 | Generation of d-wave coupling in the two-dimensional Hubbard model from functional renormalization | Within the two-dimensional repulsive t-t'-Hubbard model, an attractive
coupling in the d-wave pairing channel is induced by antiferromagnetic
fluctuations. We investigate this coupling using functional renormalization
group equations. The momentum dependent d-wave coupling can be bosonized by the
use of scale dependent... | 0801.1773v2 |
2008-01-29 | Microwave-induced coupling of superconducting qubits | We investigate the quantum dynamics of a system of two coupled
superconducting qubits under microwave irradiation. We find that, with the
qubits operated at the charge co-degeneracy point, the quantum evolution of the
system can be described by a new effective Hamiltonian which has the form of
two coupled qubits with t... | 0801.4541v2 |
2008-02-03 | Anomalous Higgs couplings in egamma collision with initial beam and final state polarizations | We investigate the constraints on the anomalous WWH couplings through the
process $e^{-}\gamma \to \nu_{e} W^{-} H$. Considering incoming beam
polarizations and the longitudinal and transverse polarization states of the
final W boson, we find 95% confidence level limits on the anomalous coupling
parameters with an inte... | 0802.0293v2 |
2008-02-08 | Noise-dependent stability of the synchronized state in a coupled system of active rotators | We consider a Kuramoto model for the dynamics of an excitable system
consisting of two coupled active rotators. Depending on both the coupling
strength and the noise, the two rotators can be in a synchronized or
desynchronized state. The synchronized state of the system is most stable for
intermediate noise intensity i... | 0802.1105v1 |
2008-02-08 | Immirzi parameter and fermions with non-minimal coupling | We clarify the role played by the Immirzi parameter in classical gravity
coupled to fermions. Considering the general non-minimal coupling, we show
that, although the torsion depends explicitly on the Immirzi parameter, in a
suitable parametrization the effective action obtained by integrating out the
spin-connection i... | 0802.1221v2 |
2008-02-12 | Dynamical Coupling Between Ferromagnets Due to Spin Transfer Torque | We use a combination of analytic calculations and numerical simulations to
demonstrate that electrical current flowing through a magnetic bilayer induces
dynamical coupling between the layers. The coupling originates from the
dependence of the spin transfer torque exerted on the layers on the relative
orientations of t... | 0802.1560v1 |
2008-02-12 | Coupling of Electronic and Motional Dynamics in a Cold Atom Optical Lattice | We study the coupling of internal electronic excitations to vibrational modes
of the external motion of ultracold atoms in an optical lattice. For different
ground and excited state potentials the on-site coupling of excitations and
vibrations term renormalizes the effective electronic transition energy, which
appears ... | 0802.1618v1 |
2008-02-12 | Strong coupling between a metallic nanoparticle and a single molecule | We theoretically investigate strong coupling between a single molecule and a
single metallic nanoparticle. A theory suited for the quantum-mechanical
description of surface plasmon polaritons (SPPs) is developed. The coupling
between these SPPs and a single molecule, and the modified molecular dynamics
in presence of t... | 0802.1630v1 |
2008-02-20 | Effect of top quark spin on the unparticle couplings in γγ\to t\bar{t} | We investigate the potential of $\gamma\gamma$ collisions to probe scalar
unparticle couplings via top-antitop quark pair production. We find 95%
confidence level limits on the unparticle couplings with an integrated
luminosity of $500 fb^{-1}$ and $\sqrt{s}=1$ TeV energy. We investigate the
effect of top quark spin po... | 0802.2818v3 |
2008-02-20 | Bang-Bang control of a qubit coupled to a quantum critical spin bath | We analytically and numerically study the effects of pulsed control on the
decoherence of a qubit coupled to a quantum spin bath. When the environment is
critical, decoherence is faster and we show that the control is relatively more
effective. Two coupling models are investigated, namely a qubit coupled to a
bath via ... | 0802.2859v2 |
2008-02-28 | Coupling efficiency for phase locking of a spin transfer oscillator to a microwave current | The phase locking behavior of spin transfer nano-oscillators (STNOs) to an
external microwave signal is experimentally studied as a function of the STNO
intrinsic parameters. We extract the coupling strength from our data using the
derived phase dynamics of a forced STNO. The predicted trends on the coupling
strength f... | 0802.4162v3 |
2008-03-17 | Gluon scattering in N=4 super-Yang-Mills theory from weak to strong coupling | I describe some recent developments in the understanding of gluon scattering
amplitudes in N=4 super-Yang-Mills theory in the large-N_c limit. These
amplitudes can be computed to high orders in the weak coupling expansion, and
also now at strong coupling using the AdS/CFT correspondence. They hold the
promise of being ... | 0803.2475v1 |
2008-04-10 | Solitary waves for linearly coupled nonlinear Schrodinger equations with inhomogeneous coefficients | Motivated by the study of matter waves in Bose-Einstein condensates and
coupled nonlinear optical systems, we study a system of two coupled nonlinear
Schrodinger equations with inhomogeneous parameters, including a linear
coupling. For that system we prove the existence of two different kinds of
homoclinic solutions to... | 0804.1785v2 |
2008-04-15 | Entangled photon pairs produced by a quantum dot strongly coupled to a microcavity | We show theoretically that entangled photon pairs can be produced on demand
through the biexciton decay of a quantum dot strongly coupled to the modes of a
photonic crystal. The strong coupling allows to tune the energy of the mixed
exciton-photon (polariton) eigenmodes, and to overcome the natural splitting
existing b... | 0804.2396v1 |
2008-04-29 | Nonlinear evolution equations for degenerate transverse waves in anisotropic elastic solids | Transverse elastic waves behave differently in nonlinear isotropic and
anisotropic media. Quadratically nonlinear coupling in the evolution equations
for wave amplitudes is not possible in isotropic solids, but such a coupling
may occur for certain directions in anisotropic materials. We identify the
expression respons... | 0804.4695v1 |
2008-05-15 | Parametrization of the QCD coupling in the Evolution Equations | We examine the parametrization of the QCD coupling in the Evolution
Equations, including DGLAP. Our conclusion is that the well-known
parametrization, where the argument of the coupling is k^2_{\perp}/\beta or
just k^2_{\perp}, stands only if the lowest integration limit in the transverse
momentum space (the starting p... | 0805.2278v1 |
2008-05-21 | Dynamical Regularization in Scalefree-trees of Coupled 2D Chaotic Maps | The dynamics of coupled 2D chaotic maps with time-delay on a scalefree-tree
is studied, with different types of the collective behaviors already been
reported for various values of coupling strength [1]. In this work we focus on
the dynamics' time-evolution at the coupling strength of the stability
threshold and examin... | 0805.3311v1 |
2008-05-29 | Driven transverse shear waves in a strongly coupled dusty plasma | The linear dispersion properties of transverse shear waves in a strongly
coupled dusty plasma are experimentally studied by exciting them in a
controlled manner with a variable frequency external source. The dusty plasma
is maintained in the strongly coupled fluid regime with (1 < Gamma << Gamma_c)
where Gamma is the C... | 0805.4514v2 |
2008-06-02 | Electron and phonon correlations in systems of one-dimensional electrons coupled to phonons | Electron and phonon correlations in systems of one-dimensional electrons
coupled to phonons are studied at low temperatures by emphasizing on the effect
of electron-phonon backward scattering. It is found that the $2k_F$-wave
components of the electron density and phonon displacement field share the same
correlations. ... | 0806.0310v3 |
2008-06-03 | Spin-Orbit Coupling in an f-electron Tight-Binding Model | We extend a tight-binding method to include the effects of spin-orbit
coupling, and apply it to the study of the electronic properties of the
actinide elements Th, U, and Pu. These tight-binding parameters are determined
for the fcc crystal structure using the equivalent equilibrium volumes. In
terms of the single part... | 0806.0420v1 |
2008-06-04 | Coupling and Level Repulsion in the Localized Regime: From Isolated to Quasi-Extended Modes | We study the interaction of Anderson localized states in an open 1D random
system by varying the internal structure of the sample. As the frequencies of
two states come close, they are transformed into multiply-peaked quasi-extended
modes. Level repulsion is observed experimentally and explained within a model
of coupl... | 0806.0704v2 |
2008-06-20 | Identical chaotic synchronization and bidirectional message transmission in incoherently coupled semiconductor laser diodes | A chaos-based communication scheme allowing simultaneous bidirectional
message transmission (Opt. Lett. 32, 403, 2007) is investigated numerically.
Incoherent feedback and coupling case is analyzed, which is expected in real
long-distance optical communication systems. It is shown that identical
synchronization of chao... | 0806.3375v1 |
2008-06-24 | Decoherence of two qubits coupled with one-mode cavity without rotating-wave approximation | The decoherence of two qubits, coupled with one-mode cavity separately, has
been investigated exactly. The results show that, for the resonant case, the
decoherence behavior of system is similar to Markovian case when the coupling
strength is weak, while the concurrence vanishes in finite time and might
recover fractio... | 0806.3884v2 |
2008-08-06 | Anomalous WWH couplings in gamma gamma collision with initial beams and final state polarizations | The constraints on anomalous Higgs boson couplings are investigated through
the process $\gamma\gamma \to W^{+}W^{-}H$. Considering the longitudinal and
transverse polarization states of the final $W^{+}$ and $W^{-}$ bosons and
incoming beam polarizations, we find 95% confidence level limits on the
anomalous coupling p... | 0808.0842v2 |
2008-09-25 | Coherent operation of superconducting flux qubits | We study the quantum operation of coupled superconducting flux qubits under a
microwave irradiation. The flux qubits can be described as magnetic dipole
moments in the limit of weak microwave field amplitude consistent with usual
experimental situations. With the Hamiltonian for coupled qubits under a
microwave field, ... | 0809.4341v3 |
2008-09-25 | Bias dependence of magnetic exchange interactions: application to interlayer exchange coupling in spin valves | We study how a bias voltage changes magnetic exchange interactions. We derive
a general expression for magnetic exchange interactions for systems coupled to
reservoirs under a bias potential, and apply it to spin valves. We find that
for metallic systems, the interlayer exchange coupling shows a weak,
oscillatory depen... | 0809.4451v1 |
2008-09-25 | Ground state cooling of nanomechanical resonator via parametric linear coupling | We present a ground state cooling scheme for a nanomechanical resonator
linearly coupled with a LC oscillator. The linear coupling, when periodically
modulated at red detuning, up-converts the low-frequency nanomechanical mode to
the high-frequency LC oscillator mode and generates backaction force that can
cool the res... | 0809.4459v2 |
2008-10-01 | Higher neutrino mass allowed if Cold Dark Matter and Dark Energy are coupled | Cosmological limits on neutrino masses are softened, by more than a factor 2,
if Cold Dark Matter (CDM) and Dark Energy (DE) are coupled. In turn, a neutrino
mass yielding $\Omega_\nu$ up to $\sim0.20$ allows coupling levels $\beta
\simeq 0.15, $ or more, already easing the coincidence problem. The coupling,
in fact, d... | 0810.0127v2 |
2008-10-16 | Synchronization of Coupled Anizochronous Auto-Oscillating Systems | The particular properties of synchronization are discussed for coupled
auto-oscillating systems, which are characterized by non-quadratic law of
potential dependence on the coordinate. In particular, structure of the
parameter plane (frequency mismatch - coupling value) is considered for coupled
van der Pol - Duffing o... | 0810.2863v1 |
2008-10-30 | Berry Phase in a Single Quantum Dot with Spin-Orbit Interaction | Berry phase in a single quantum dot with Rashba spin-orbit coupling is
investigated theoretically. Berry phases as functions of magnetic field
strength, dot size, spin-orbit coupling and photon-spin coupling constants are
evaluated. It is shown that the Berry phase will alter dramatically from 0 to
$2\pi$ as the magnet... | 0810.5405v1 |
2008-11-20 | Gravitational correction to SU(5) gauge coupling unification | The gravitational corrections to the gauge coupling constants of abelian and
non-abelian gauge theories has been shown to diverge quadratically. Since this
result will have interesting consequences, this has been analyzed by several
authors from different approaches. We propose to discuss this issue from a
phenomenolog... | 0811.3307v2 |
2008-11-25 | Emergence of zero-lag synchronization in generic mutually coupled chaotic systems | Zero-lag synchronization (ZLS) is achieved in a very restricted mutually
coupled chaotic systems, where the delays of the self-coupling and the mutual
coupling are identical or fulfil some restricted ratios. Using a set of
multiple self-feedbacks we demonstrate both analytically and numerically that
ZLS is achieved for... | 0811.4066v1 |
2008-12-01 | Gauge Coupling Unification in F-theory GUT Models | We investigate gauge coupling unification for F-theory respectively Type IIB
orientifold constructions of SU(5) GUT theories with gauge symmetry breaking
via non-trivial hypercharge flux. This flux has the non-trivial effect that it
splits the values of the three MSSM gauge couplings at the string scale, thus
potential... | 0812.0248v3 |
2008-12-04 | Transition to complete synchronization in phase coupled oscillators with nearest neighbours coupling | We investigate synchronization in a Kuramoto-like model with nearest
neighbour coupling. Upon analyzing the behaviour of individual oscillators at
the onset of complete synchronization, we show that the time interval between
bursts in the time dependence of the frequencies of the oscillators exhibits
universal scaling ... | 0812.0998v1 |
2009-01-04 | Coupling between a dark and a bright eigenmode in a terahertz metamaterial | Terahertz time domain spectroscopy and rigorous simulations are used to probe
the coupling between a dark and a bright plasmonic eigenmode in a metamaterial
with broken symmetry. The metamaterial consists of two closely spaced split
ring resonators that have their gaps in non-identical positions within the
ring. For no... | 0901.0365v1 |
2009-01-17 | Electronic interferometer capacitively coupled to a quantum dot | We theoretically study electron interference in a ballistic electronic
interferometer capacitively coupled to a quantum dot. The visibility of the
interference is reduced when the dot has degenerate ground states with
different excess charges. The degree of the reduction depends on system
parameters such as the strengt... | 0901.2626v2 |
2009-01-27 | Weakly coupled discretized gravity | We consider discretized gravity in 4+2 dimensions compactified on a disk of
constant negative curvature. The curvature of the disk avoids the presence of
dangerous ultra-light scalar modes but comes also along with a high
multiplicity of states potentially jeopardizing a good strong-coupling behavior
of the discretized... | 0901.4304v1 |
2009-01-31 | An improved lattice measurement of the critical coupling in phi^4_2 theory | We use Monte Carlo simulations to obtain an improved lattice measurement of
the critical coupling constant [lambda / mu^2]_crit for the continuum (1 +
1)-dimensional (lambda / 4) phi^4 theory. We find that the critical coupling
constant depends logarithmically on the lattice coupling, resulting in a
continuum value of ... | 0902.0045v1 |
2009-02-03 | Asynchronous response of coupled pacemaker neurons | We study a network model of two conductance-based pacemaker neurons of
differing natural frequency, coupled with either mutual excitation or
inhibition, and receiving shared random inhibitory synaptic input. The networks
may phase-lock spike-to-spike for strong mutual coupling. But the shared input
can desynchronize th... | 0902.0602v1 |
2009-02-19 | Impurity induced spin-orbit coupling in graphene | We study the effect of impurities in inducing spin-orbit coupling in
graphene. We show that the sp3 distortion induced by an impurity can lead to a
large increase in the spin-orbit coupling with a value comparable to the one
found in diamond and other zinc-blende semiconductors. The spin-flip scattering
produced by the... | 0902.3244v1 |
2009-03-05 | Modification of spin mixing of spinor BEC by cavity QED coupling | Dressed states of spinor Bose-Einstein condensates of spin-1 atoms coupling
with optical cavity modes with far off resonance frequency are investigated.
The exact solution of time evolution of population of spin component is
derived, and the numerical result shows that the evolution is different from
spin mixing withou... | 0903.0998v1 |
2009-03-23 | Higher Order Couplings in Magnetized Brane Models | We compute three-point and higher order couplings in magnetized brane models.
We show that higher order couplings are written as products of three-point
couplings. This behavior is the same as higher order amplitudes by conformal
field theory calculations e.g. in intersecting D-brane models. | 0903.3800v2 |
2009-03-30 | Weakly coupled bound states of Pauli operators | We consider the two-dimensional Pauli operator perturbed by a weakly coupled,
attractive potential. We show that besides the eigenvalues arising from the
Aharonov-Casher zero modes there are two or one (depending on whether the flux
of the magnetic field is integer or not) additional eigenvalues for arbitrarily
small c... | 0903.5333v1 |
2009-04-08 | On the gauge coupling unification | We consider a quark-lepton symmetry model of unification of the strong and
electromagnetic interactions. The model has the gauge group $SU(4)\times
U(1)_{Y}$ and the minimal Higgs structure consisting of one complex quartet of
scalar particles. The spontaneous breakdown of the gauge group to
$SU(3)_{c}\times U(1)_{em}$... | 0904.1324v1 |
2009-04-10 | Single bipolaronic Transition in Jahn-Teller Model | We investigate the bipolaronic crossover and the pairing transition for a
two-orbital model with Jahn-Teller coupling to a two-fold degenerate phonon
mode. The evolution from weak to strong coupling is reminiscent of the behavior
of the single-band Holstein model: The polaron crossover in which the electrons
and phonon... | 0904.1711v1 |
2009-04-26 | Bouncing Universe with a Nonminimally Coupled Scalar Field on a Moving Domain Wall | We study dynamics of a dark energy component nonminimally coupled to gravity
on a moving domain wall. We use this setup to explain late-time accelerated
expansion and crossing of the phantom divide line by the equation of state
parameter of this non-minimally coupled dark energy component. By analyzing
parameter space ... | 0904.4029v1 |
2009-04-28 | Scalar dark matter-Higgs coupling in the case of electroweak symmetry breaking driven by unparticle | We study the possible annihilation cross section of scalar dark matter and
its coupling \lambda_D to the standard model Higgs in the case of the
electroweak symmetry breaking driven by unparticle. Here the annihilation
process occurs with the help of three intermediate scalars which appear after
the mixing. By respecti... | 0904.4369v1 |
2009-05-04 | Berry Phase Coupling and the Cuprate Neutron Scattering Resonance | We examine the influence of coupling between particle-hole and
particle-particle spin fluctuations on the inelastic neutron scattering
resonance (INSR) in cuprate superconductors in both weak and strong interaction
limits. For weak-interactions in the particle-hole channel, we find that the
interchannel coupling can el... | 0905.0464v1 |
2009-05-05 | Transport through a band insulator with Rashba spin-orbit coupling: metal-insulator transition and spin-filtering effects | We calculate the current-voltage characteristic of a one-dimensional band
insulator with magnetic field and Rashba spin-orbit coupling which is connected
to nonmagnetic leads. Without spin-orbit coupling we find a complete
spin-filtering effect, meaning that the electric transport occurs in one spin
channel only. For a... | 0905.0611v1 |
2009-05-12 | Globally clustered chimera states in delay--coupled populations | We have identified the existence of globally clustered chimera states in
delay coupled oscillator populations and find that these states can breathe
periodically, aperiodically and become unstable depending upon the value of
coupling delay. We also find that the coupling delay induces frequency
suppression in the desyn... | 0905.1797v1 |
2009-05-12 | Pauli Spin Blockade in the Presence of Strong Spin-Orbit Coupling | We study electron transport in a double quantum dot in the Pauli spin
blockade regime, in the presence of strong spin-orbit coupling. The effect of
spin-orbit coupling is incorporated into a modified interdot tunnel coupling.
We elucidate the role of the external magnetic field, the nuclear fields in the
dots, and spin... | 0905.1818v1 |
2009-05-20 | Polaronic memristor strongly coupled to electrodes | Attractive electron correlations due to an electron-vibron interaction (EVI)
can overcome the direct Coulomb repulsion of polarons in strongly deformable
molecular quantum dots (MQDs). If it realizes, a switching appears in the I-V
characteristics of the degenerate nonadiabatic molecular bridges weakly coupled
to elect... | 0905.3230v1 |
2009-05-20 | Strong coupling theory for the Jaynes-Cummings-Hubbard model | We present an analytic strong-coupling approach to the phase diagram and
elementary excitations of the Jaynes-Cummings-Hubbard model describing a
superfluid-insulator transition of polaritons in an array of coupled QED
cavities. In the Mott phase, we find four modes corresponding to particle/hole
excitations with lower... | 0905.3344v2 |
2009-05-23 | Weak and Strong-Coupling Electrostatic Interactions between Asymmetrically Charged Planar Surfaces | We compare weak and strong coupling theory of counterion-mediated
electrostatic interactions between two asymmetrically charged plates with
extensive Monte-Carlo simulations. Analytical results in both weak and strong
coupling limits compare excellently with simulations in their respective
regimes of validity. The syst... | 0905.3851v1 |
2009-06-03 | Fast Electrical Control of a Quantum Dot Strongly Coupled to a Nano-resonator | The resonance frequency of an InAs quantum dot strongly coupled to a GaAs
photonic crystal cavity was electrically controlled via quantum confined Stark
effect. Stark shifts up to 0.3meV were achieved using a lateral Schottky
electrode that created a local depletion region at the location of the quantum
dot. We report ... | 0906.0751v1 |
2009-06-04 | Theory of Optically-Driven Sideband Cooling for Atomic Collective Excitations and Its Generalization | We explore how to cool atomic collective excitations in an optically-driven
three-level atomic ensemble, which may be described by a model of coupled two
harmonic oscillators (HOs) with a time-dependent coupling. Moreover, the
coupled two-HO model is further generalized to address other cooling issues,
where the lower-... | 0906.0806v1 |
2009-06-09 | Quantum criticality near the Stoner transition in a two-dot with spin-orbit coupling | We study a system of two tunnel-coupled quantum dots, with the first dot
containing interacting electrons (described by the Universal Hamiltonian) not
subject to spin-orbit coupling, whereas the second contains non-interacting
electrons subject to spin-orbit coupling. We focus on describing the behavior
of the system n... | 0906.1838v1 |
2009-06-17 | Phase transition and correlation decay in Coupled Map Lattices | For a Coupled Map Lattice with a specific strong coupling emulating
Stavskaya's probabilistic cellular automata, we prove the existence of a phase
transition using a Peierls argument, and exponential convergence to the
invariant measures for a wide class of initial states using a technique of
decoupling originally deve... | 0906.3017v2 |
2009-06-18 | Do data favor neutrino mass and a coupling between Cold Dark Matter and Dark Energy? | We allow simultaneously for a CDM--DE coupling and non--zero neutrino masses
and find that significant coupling and neutrino mass are (slightly)
statistically favoured in respect to a cosmology with no coupling and
negligible neutrino mass (our best fits are: C~1/2m_p, m_\nu~0.12eV each
flavor). We assume DE to be a se... | 0906.3369v1 |
2009-06-23 | Exact AdS/CFT spectrum: Konishi dimension at any coupling | We compute the full dimension of Konishi operator in planar N=4 SYM theory it
for a wide range of couplings, from weak to strong coupling regime, and predict
the subleading terms in its strong coupling asymptotics. For this purpose we
solve numerically the integral form of the AdS/CFT Y-system equations for the
exact e... | 0906.4240v2 |
2009-06-29 | Quantum logic with weakly coupled qubits | There are well-known protocols for performing CNOT quantum logic with qubits
coupled by particular high-symmetry (Ising or Heisenberg) interactions.
However, many architectures being considered for quantum computation involve
qubits or qubits and resonators coupled by more complicated and less symmetric
interactions. H... | 0906.5209v1 |
2009-07-02 | Effect of next-nearest neighbor coupling on the optical spectra in bilayer graphene | We investigate the dependence of the optical conductivity of bilayer graphene
(BLG) on the intra- and inter-layer interactions using the most complete model
to date. We show that the next nearest-neighbor intralayer coupling introduces
new features in the low-energy spectrum that are highly sensitive to sample
doping, ... | 0907.0504v1 |
2009-07-09 | Higher-dimensional solitons and black holes with a non-minimally coupled scalar field | We study higher-dimensional soliton and hairy black hole solutions of the
Einstein equations non-minimally coupled to a scalar field. The scalar field
has no self-interaction potential but a cosmological constant is included.
Non-trivial solutions exist only when the cosmological constant is negative and
the constant g... | 0907.1487v2 |
2009-07-12 | Konishi at strong coupling from ABE | In this letter, we derive analytically the scaling dimension of the Konishi
operator in planar N=4 gauge theory at strong coupling from the asymptotic
Bethe equations. The first two leading terms agree with the recent string
computation and numerical analysis of TBA equations. At the third order we find
spurious logari... | 0907.1919v1 |
2009-07-16 | Entanglement localization after a coupling to incoherent noisy system | We report the experimental realization of entanglement localization which
restores polarization entanglement completely redirected after a linear
coupling with incoherent and noisy surrounding photon. The method, based only
on measurements of the surrounding photon after the coupling and on
post-selection, can localize... | 0907.2780v1 |
2009-08-06 | Coupled Modulated Bilayers | We propose a model addressing the coupling mechanism between two spatially
modulated monolayers. We obtain the mean-field phase diagrams of coupled
bilayers when the two monolayers have the same preferred modulation wavelength.
Various combinations of the monolayer modulated phases are obtained and their
relative stabi... | 0908.0871v2 |
2009-08-13 | Relativistic coupled-cluster calculations of $^{20}$Ne, $^{40}$Ar, $^{84}$Kr and $^{129}$Xe: correlation energies and dipole polarizabilities | We have carried out a detailed and systematic study of the correlation
energies of inert gas atoms Ne, Ar, Kr and Xe using relativistic many-body
perturbation theory and relativistic coupled-cluster theory. In the
relativistic coupled-cluster calculations, we implement perturbative triples
and include these in the corr... | 0908.1899v1 |
2009-08-20 | Anomalous Quartic Gauge Couplings from Six Quark Production | The absence of a light Higgs boson causes vector boson couplings to become
strong at 1 TeV. A general framework for a systematic and consistent treatment
is provided by effective theories of electroweak symmetry breaking. Already in
next-to-leading order there appear quartic gauge couplings that go beyond the
standard ... | 0908.2951v1 |
2009-09-07 | Fine structure in the tunneling spectra of electron-doped cuprates: No coupling to magnetic resonance mode | We analyze high-resolution scanning tunneling spectra of the electron-doped
cuprate Pr0.88LaCe0.12CuO4 (T_c = 24 K). We find that the spectral fine
structure below 35 meV is consistent with strong coupling to a bosonic mode at
16 meV, in quantitative agreement with early tunneling spectra of
Nd1.85Ce0.15CuO4. Since the... | 0909.1136v1 |
2009-09-15 | Critical current density for spin transfer torque switching with composite free layer structure | Critical current density of composite free layer (CFL) in magnetic tunneling
junction is investigated. CFL consists of two exchange coupled ferromagnetic
layers, where the coupling is parallel or anti-parallel. Instability condition
of the CFL under the spin transfer torque, which is related with critical
current densi... | 0909.2711v1 |
2009-09-22 | The exchange coupling between the valence electrons of the fullerene cage and the electrons of the N atoms in N@C60^{-1,3} | MCSCF calculations are performed in order to determine the exchange coupling
between the 2p electrons of the N atom and the LUMOs of the fullerene cage in
the case of mono- and tri-anions of N@C60. The exchange coupling resulted by
our calculations is large compared to the hyperfine interaction. The strong
coupling can... | 0909.3939v1 |
2009-09-22 | Probing New Physics in Charm Couplings with Kaon and Other Hadron Processes | It is possible that the low-energy effects of physics beyond the standard
model can be parametrized mainly by anomalous couplings of quarks to the W
boson. Such couplings can generate potentially significant contributions to
various transitions that can be probed by current and future experiments. This
work explores co... | 0909.3957v1 |
2009-10-14 | Running of the coupling and quark mass in SU(2) with two adjoint fermions | We simulate SU(2) gauge theory with two massless Dirac fermions in the
adjoint representation. We calculate the running of the Schroedinger Functional
coupling and the renormalised quark mass over a wide range of length scales.
The running of the coupling is consistent with the existence of an infrared
fixed point (IRF... | 0910.2562v1 |
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 |
2009-10-16 | Finite-size scaling tests for SU(3) lattice gauge theory with color sextet fermions | The observed slow running of the gauge coupling in SU(3) lattice gauge theory
with two flavors of color sextet fermions naturally suggests it is a theory
with one relevant coupling, the fermion mass, and that at zero mass correlation
functions decay algebraically. I perform a finite-size scaling study on
simulation dat... | 0910.3072v1 |
2009-11-19 | Non-minimal Kinetic coupling to gravity and accelerated expansion | We study a scalar field with kinetic term coupled to itself and to the
curvature, as a source of dark energy, and analyze the role of this new
coupling in the accelerated expansion at large times. In the case of scalar
field dominance, the scalar field and potential giving rise to power-law
expansion are found in some ... | 0911.3702v2 |
2010-01-04 | Nonminimal Inflation on the Randall-Sundrum II Brane with Induced Gravity | We study an inflation model that inflaton field is non-minimally coupled to
the induced scalar curvature on the Randall-Sundrum (RS) II brane. We
investigate the effects of the non-minimal coupling on the inflationary
dynamics of this braneworld model. Our study shows that the number of e-folds
decreases by increasing ... | 1001.0444v1 |
2010-01-14 | State transfer in static and dynamic spin chains with disorder | We examine the speed and fidelity of several protocols for state or single
excitation transfer in finite spin chains subject to diagonal and off-diagonal
disorder. We find that, for a given chain length and maximal achievable
inter-spin exchange (XY) coupling strength, the optimal static spin-coupling
protocol, impleme... | 1001.2444v1 |
2010-01-15 | The innocuousness of adiabatic instabilities in coupled scalar field-dark matter models | Non-minimally coupled scalar field models suffer of unstable growing modes at
the linear perturbation level. The nature of these instabilities depends on the
dynamical state of the scalar field. In particular in systems which admit
adiabatic solutions, large scale instabilities are suppressed by the slow-roll
dynamics ... | 1001.2687v1 |
2010-01-25 | Spontaneous creation of non-zero angular momentum modes in tunnel-coupled two-dimensional degenerate Bose gases | We investigate the dynamics of two tunnel-coupled two-dimensional degenerate
Bose gases. The reduced dimensionality of the clouds enables us to excite
specific angular momentum modes by tuning the coupling strength, thereby
creating striking patterns in the atom density profile. The extreme sensitivity
of the system to... | 1001.4344v1 |
2010-02-03 | Deformation Potentials and Electron-Phonon Coupling in Silicon Nanowires | The role of reduced dimensionality and of the surface on electron-phonon
(e-ph) coupling in silicon nanowires is determined from first principles.
Surface termination and chemistry is found to have a relatively small
influence, whereas reduced dimensionality fundamentally alters the behavior of
deformation potentials. ... | 1002.0719v1 |
2010-02-04 | Entanglement of fields in coupled-cavities: effects of pumping and fluctuations | A system of two coupled cavities is studied in the context of bipartite,
continuous variable entanglement. One of the cavities is pumped by an external
classical source that is coupled quadratically, to the cavity field. Dynamics
of entanglement, quantified by covariance measure [Dodonov {\it et al}, Phys.
Lett A {\bf ... | 1002.0913v1 |
2010-02-04 | The electron-phonon theory of superconductors: Tc map and vertex correction | The strong coupling Eliashberg theory plus vertex correction is used to
calculate maps of transition temperature (Tc) in parameter-space characterizing
superconductivity. Based on these Tc maps, crossover behaviors are found when
electron-phonon interaction increases from weak-coupling region to strong
coupling region.... | 1002.0998v2 |
2010-03-08 | Spin-orbit coupling in a graphene bilayer and in graphite | The intrinsic spin-orbit interactions in bilayer graphene and in graphite are
studied, using a tight binding model, and an intraatomic LS coupling. The
spin-orbit interactions in bilayer graphene and graphite are larger, by about
one order of magnitude, than the interactions in single layer graphene, due to
the mixing ... | 1003.1618v1 |
2010-03-09 | Ground state properties of the Holstein model near the adiabatic limit | We adapt a variational procedure to calculate ground state properties of the
Holstein model in the adiabatic limit. At strong coupling, this adaption leads
to rapid convergence of results. The intermediate coupling regime is further
handled with an adaptive algorithm. We also use semi-classically derived
results for th... | 1003.1952v1 |
2010-03-19 | Competition between symmetry breaking and onset of collapse in weakly coupled atomic condensates | We analyze the symmetry breaking of matter-wave solitons in a pair of
cigar-shaped traps coupled by tunneling of atoms. The model is based on a
system of linearly coupled nonpolynomial Schr\"odinger equations (NPSEs).
Unlike the well-known spontaneous-symmetry-breaking (SSB) bifurcation in
coupled cubic equations, in t... | 1003.3835v1 |
2010-03-30 | The constructive role of diversity on the global response of coupled neuron systems | We study the effect that the heterogeneity present among the elements of an
ensemble of coupled excitable neurons have on the collective response of the
system to an external signal. We have considered two different interaction
scenarios, one in which the neurons are diffusively coupled and another in
which the neurons... | 1003.5804v1 |
2010-04-12 | Spontaneous Symmetry Breaking in Two Coupled Nanomechanical Electron Shuttles | We present spontaneous symmetry breaking in a nanoscale version of a setup
prolific in classical mechanics: two coupled nanomechanical pendulums. The two
pendulums are electron shuttles fabricated as nanopillars and placed between
two capacitor plates in a homogeneous electric field. Instead of being
mechanically coupl... | 1004.2028v1 |
2010-04-23 | Spin-orbit coupling and perpendicular Zeeman field for fermionic cold atoms: observation of the intrinsic anomalous Hall effect | We propose a scheme for generating Rashba spin-orbit coupling and
perpendicular Zeeman field simultaneously for cold fermionic atoms in a
harmonic trap through the coupling between atoms and laser fields. The
realization of Rashba spin-orbit coupling and perpendicular Zeeman field
provides opportunities for exploring m... | 1004.4231v3 |
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