publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2006-02-09 | Strong coupling between single photons in semiconductor microcavities | We discuss the observability of strong coupling between single photons in
semiconductor microcavities coupled by a chi(2) nonlinearity. We present two
schemes and analyze the feasibility of their practical implementation in three
systems: photonic crystal defects, micropillars and microdisks, fabricated out
of GaAs. We... | 0602085v1 |
2006-05-07 | Quantum Gate Design Metric | What is the time-optimal way of realizing quantum operations? Here, we show
how important instances of this problem can be related to the study of shortest
paths on the surface of a sphere under a special metric. Specifically, we
provide an efficient synthesis of a controlled NOT (CNOT) gate between qubits
coupled indi... | 0605071v1 |
2006-07-02 | Geometric quantum computation using fictitious spin- 1/2 subspaces of strongly dipolar coupled nuclear spins | Geometric phases have been used in NMR, to implement controlled phase shift
gates for quantum information processing, only in weakly coupled systems in
which the individual spins can be identified as qubits. In this work, we
implement controlled phase shift gates in strongly coupled systems, by using
non-adiabatic geom... | 0607007v1 |
2006-10-22 | Generation of maximally entangled mixed states of two atoms via on-resonance asymmetric atom-cavity couplings | A scheme for generating the maximally entangled mixed state of two atoms
on-resonance asymmetrically coupled to a single mode optical cavity field is
presented. The part frontier of both maximally entangled mixed states and
maximal Bell violating mixed states can be approximately reached by the
evolving reduced density... | 0610188v1 |
2007-05-04 | Applicability of layered sine-Gordon models to layered superconductors: II. The case of magnetic coupling | In this paper, we propose a quantum field theoretical renormalization group
approach to the vortex dynamics of magnetically coupled layered
superconductors, to supplement our earlier investigations on the
Josephson-coupled case. We construct a two-dimensional multi-layer sine-Gordon
type model which we map onto a gas o... | 0705.0578v3 |
2007-05-08 | Particle-vibration coupling within covariant density functional theory | Covariant density functional theory, which has so far been applied only
within the framework of static and time dependent mean field theory is extended
to include Particle-Vibration Coupling (PVC) in a consistent way. Starting from
a conventional energy functional we calculate the low-lying collective
vibrations in Rel... | 0705.1044v1 |
2007-05-25 | Quantum computation in a Ising spin chain taking into account second neighbor couplings | We consider the realization of a quantum computer in a chain of nuclear spins
coupled by an Ising interaction. Quantum algorithms can be performed with the
help of appropriate radio-frequency pulses. In addition to the standard
nearest-neighbor Ising coupling, we also allow for a second neighbor coupling.
It is shown, ... | 0705.3688v1 |
2007-06-15 | Efficient analysis and design of low-loss whispering-gallery-mode coupled resonator optical waveguide bends | Waveguides composed of electromagnetically-coupled optical microcavities
(coupled resonator optical waveguides or CROWs) can be used for light guiding,
slowing and storage. In this paper, we present a two-dimensional analysis of
finite-size straight and curved CROW sections based on a rigorous Muller
boundary integral ... | 0706.2279v1 |
2007-06-20 | Complexity in linearly coupled dynamical networks: Some unusual phenomena in energy accumulation | This paper addresses the energy accumulation problem, in terms of the $H_2$
norm, of linearly coupled dynamical networks. An interesting outer-coupling
relationship is constructed, under which the $H_2$ norm of the newly
constructed network with column-input and row-output shaped matrices increases
exponentially fast w... | 0706.2902v1 |
2007-07-10 | Superexchange induced canted ferromagnetism in dilute magnets | We argue, in contrast to recent studies, that the antiferromagnetic
superexchange coupling between nearest neighbour spins does not fully destroy
the ferromagnetism in dilute magnets with long-ranged ferromagnetic couplings.
Above a critical coupling, we find a \textit{canted} ferromagnetic phase with
unsaturated momen... | 0707.1522v1 |
2007-07-16 | Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots | We have investigated few-body states in vertically stacked quantum dots. Due
to small inter-dot tunneling rate, the coupling in our system is in a
previously unexplored regime where electron-hole exchange is the dominant spin
interaction. By tuning the gate bias, we are able to turn this coupling off and
study a comple... | 0707.2111v1 |
2007-08-02 | Anomalous exciton lifetime by an electromagnetic coupling of self-assembled quantum dots | We report on the experimental observation of a hitherto ignored long-range
electromagnetic coupling between self-assembled quantum dots. A 12 times
enhancement of the quantum dot exciton lifetime is observed by means of
time-resolved differential reflection spectroscopy. The enhancement is
explained by utilizing and ex... | 0708.0418v1 |
2007-08-19 | Quantum Energy Inequalities for the Non-Minimally Coupled Scalar Field | In this paper we discuss local averages of the energy density for the
non-minimally coupled scalar quantum field, extending a previous investigation
of the classical field. By an explicit example, we show that such averages are
unbounded from below on the class of Hadamard states. This contrasts with the
minimally coup... | 0708.2450v2 |
2007-08-21 | Fixed point scenario in the Two Higgs Doublet Model inspired by degenerate vacua | We consider the renormalisation group flow of Higgs and Yukawa couplings
within the simplest non--supersymmetric two Higgs doublet extension of the
Standard Model (SM). In this model the couplings are adjusted so that the
multiple point principle (MPP) assumption, which implies the existence of a
large set of degenerat... | 0708.2903v2 |
2007-08-31 | Consequences of a Cosmic Scalar with Kinetic Coupling to Curvature | The classical gravitational theory of a scalar field with a gradient coupling
to the Ricci tensor is examined. This is a scalar-vector-tensor gravitational
theory, but in the case that the coupling is weak and the scalar evolves like a
quintessence field on cosmological time scales, the field equations within the
solar... | 0709.0009v1 |
2007-09-02 | Towards Low Cost Coupling Structures for Short-Distance Optical Interconnections | The performance of short distance optical interconnections in general relies
very strongly on coupling structures, since they will determine the overall
efficiency of the system to a large extent. Different configurations can be
considered and a variety of manufacturing technologies can be used. We present
two differen... | 0709.0122v1 |
2007-09-03 | Interqubit coupling mediated by a high-excitation-energy quantum object | We consider a system composed of two qubits and a high-excitation-energy
quantum object used to mediate coupling between the qubits. We treat the entire
system quantum mechanically and analyze the properties of the eigenvalues and
eigenstates of the total Hamiltonian. After reproducing well-known results
concerning the... | 0709.0237v2 |
2007-09-10 | Spin-gap behaviour in the 2-leg spin-ladder BiCu2PO6 | We present magnetic suscceptibility and heat capacity data on a new S=1/2
two-leg spin ladder compound BiCu2PO6. From our susceptibility analysis, we
find that the leg coupling J1/k_B is ~ 80 K and the ratio of the rung to leg
coupling J2/J1 ~ 0.9. We present the magnetic contribution to the heat capacity
of a two-leg ... | 0709.1338v1 |
2007-09-11 | Dark Energy, scalar-curvature couplings and a critical acceleration scale | We study the effects of coupling a cosmologically rolling scalar field to
higher order curvature terms. We show that when the strong coupling scale of
the theory is on the 10^{-3}-10^{-1}eV range, the model passes all experimental
bounds on the existence of fifth forces even if the field has a mass of the
order of the ... | 0709.1622v1 |
2007-09-17 | Decoherence induced by a dynamic spin environment (II): Disentanglement by local system-environment interactions | This article studies the decoherence induced on a system of two qubits by
local interactions with a spin chain with nontrivial internal dynamics
(governed by an XY Hamiltonian). Special attention is payed to the transition
between two limits: one in which both qubits interact with the same site of the
chain and another... | 0709.2643v1 |
2007-09-27 | Time-optimal synthesis of unitary transformations in coupled fast and slow qubit system | In this paper, we study time-optimal control problems related to system of
two coupled qubits where the time scales involved in performing unitary
transformations on each qubit are significantly different. In particular, we
address the case where unitary transformations produced by evolutions of the
coupling take much ... | 0709.4484v1 |
2007-10-01 | Strong-to-weak-coupling duality in the nonequilibrium interacting resonant-level model | A strong-to-weak-coupling duality is established for the nonequilibrium
interacting resonant-level model, describing tunneling through a single
spinless level, capacitively coupled to two leads by a contact interaction. For
large capacitive coupling, U, and in the presence of a finite voltage bias, the
model maps onto ... | 0710.0249v1 |
2007-10-01 | Coupling constant constraints in a nonminimally coupled phantom cosmology | In the paper we investigate observational constraints on coupling to gravity
constant parameter $\xi$ using distant supernovae SNIa data, baryon oscillation
peak (BOP), the cosmic microwave background radiation (CMBR) shift parameter,
and $H(z)$ data set. We estimate the value of this parameter to constrain the
extende... | 0710.0366v3 |
2007-10-16 | Local Normal Mode Coupling and Energy Band Splitting in Elliptically Birefringent 1D Magnetophotonic Crystals | An analysis is presented of wave-vector dispersion in elliptically
birefringent stratified magneto-optic media having one-dimensional periodicity.
It is found that local normal-mode polarization-state differences between
adjacent layers lead to mode coupling and impact the wave-vector dispersion and
the character of th... | 0710.3176v1 |
2007-11-06 | Finite temperature SU(2) gauge theory: critical coupling and universality class | We examine SU(2) gauge theory in 3+1 dimensions at finite temperature in the
vicinity of critical point. For various lattice sizes in time direction
($N_\tau=1,2,4,8$) we extract high precision values of the inverse critical
coupling and critical values of the 4-th order cumulant of Polyakov loops
(Binder cumulant). We... | 0711.0748v2 |
2007-11-07 | Core polarization in coupled-cluster theory induced by a parity and time-reversal violating interaction | The effects of parity and time reversal violating potential, in particular
the tensor-pseudotensor electron nucleus interaction are studied. We establish
that selected terms representing the interplay of these effects and the
residual Coulomb interaction in the coupled-cluster method are equivalent to
the coupled pertu... | 0711.1047v1 |
2007-11-10 | Bose Hubbard model in the presence of Ohmic dissipation | We study the zero temperature mean-field phase diagram of the Bose-Hubbard
model in the presence of local coupling between the bosons and an external
bath. We consider a coupling that conserves the on-site occupation number,
preserving the robustness of the Mott and superfluid phases. We show that the
coupling to the b... | 0711.1563v2 |
2007-11-17 | Periodic energy switching of bright solitons in mixed coupled nonlinear Schr{ö}dinger equations with linear self and cross coupling terms | The bright soliton solutions of the mixed 2-coupled nonlinear Schr{\"o}dinger
(CNLS) equations with linear self and cross coupling terms have been obtained
by identifying a transformation that transforms the corresponding equation to
the integrable mixed 2-CNLS equations. The study on the collision dynamics of
bright s... | 0711.2717v1 |
2007-12-10 | Quantum well states in Fe/Nb(001) multilayers: First principles study | We present a first-principles study to understand the phenomena of interlayer
exchange coupling in Fe/Nb multilayers using the linearized-muffin-tin-orbitals
method within the generalized gradient approximation. We find that the exchange
coupling oscillates with both short and long periodicities, which have been
examin... | 0712.1432v1 |
2007-12-12 | Infinite coupling duals of N=2 gauge theories and new rank 1 superconformal field theories | We show that a proposed duality [arXiv:0711.0054] between infinitely coupled
gauge theories and superconformal field theories (SCFTs) with weakly gauged
flavor groups predicts the existence of new rank 1 SCFTs. These superconformal
fixed point theories have the same Coulomb branch singularities as the rank 1
E_6, E_7, ... | 0712.2028v1 |
2007-12-19 | Direct evidence of overdamped Peierls-coupled modes in TTF-CA temperature-induced phase transition | In this paper we elucidate the optical response resulting from the interplay
of charge distribution (ionicity) and Peierls instability (dimerization) in the
neutral-ionic, ferroelectric phase transition of tetrathiafulvalene-chloranil
(TTF-CA), a mixed-stack quasi-one-dimensional charge-transfer crystal. We
present far... | 0712.3267v1 |
2008-01-10 | Dynamics of dark energy with a coupling to dark matter | Dark energy and dark matter are the dominant sources in the evolution of the
late universe. They are currently only indirectly detected via their
gravitational effects, and there could be a coupling between them without
violating observational constraints. We investigate the background dynamics
when dark energy is mode... | 0801.1565v2 |
2008-01-11 | Inflation by non-minimal coupling | Inflationary scenarios based on simple non-minimal coupling and its
generalizations are studied. Generalizing the form of non-minimal coupling to
"K(phi)R" with an arbitrary function K(phi), we show that the flat potential
still is obtainable when V(phi)/K^2(phi) is asymptotically constant. Very
interestingly, if the r... | 0801.1722v4 |
2008-01-17 | The running coupling from the four-gluon vertex in Landau gauge Yang-Mills theory | We consider the running coupling from the four-gluon vertex in Landau gauge,
SU($N_c$) Yang-Mills theory as given by a combination of dressing functions of
the vertex and the gluon propagator. We determine these functions numerically
from a coupled set of Dyson-Schwinger equations. We reproduce asymptotic
freedom in th... | 0801.2697v2 |
2008-01-23 | Photon-assistant Fano resonance in coupled multiple quantum dots | Based on calculations of the electronic structure of coupled multiple quantum
dots, we study systemically the transport properties of the system driven by an
ac electric field. We find qualitative difference between transport properties
of double coupled quantum dots (DQDs) and triple quantum dots. For both
symmetrical... | 0801.3515v1 |
2008-01-31 | What are the interactions in quantum glasses? | The form of the low-temperature interactions between defects in neutral
glasses is reconsidered. We analyse the case where the defects can be modelled
either as simple 2-level tunneling systems, or tunneling rotational impurities.
The coupling to strain fields is determined up to 2nd order in the displacement
field. It... | 0801.4944v2 |
2008-02-04 | Spectroscopy of superconducting charge qubits coupled by a Josephson inductance | We have designed and experimentally implemented a circuit of
inductively-coupled superconducting charge qubits, where a Josephson junction
is used as an inductance, and the coupling between the qubits is controlled by
an applied magnetic flux. Spectroscopic measurements on the circuit are in good
agreement with theoret... | 0802.0353v1 |
2008-02-08 | Constraints on coupling constant between dark energy and dark matter | We have investigated constraints on the coupling between dark matter and the
interacting Chaplygin gas. Our results indicate that the coupling constant $c$
between these two entities can take arbitrary values, which can be either
positive or negative, thus giving arbitrary freedom to the inter-conversion
between Chaply... | 0802.1144v4 |
2008-02-18 | Finite- to zero-range relativistic mean-field interactions | We study the relation between the finite-range (meson-exchange) and
zero-range (point-coupling) representations of effective nuclear interactions
in the relativistic mean-field framework. Starting from the phenomenological
interaction DD-ME2 with density-dependent meson-nucleon couplings, we construct
a family of point... | 0802.2442v2 |
2008-02-21 | Transmission of information and synchronization in a pair of coupled chaotic circuits: an experimental overview | We propose a rationale for experimentally studying the intricate relationship
between the rate of information transmission and synchronization level in
active networks, applying theoretical results recently proposed. We consider
two non-identical coupled Chua's circuit with non-identical coupling strengths
in order to ... | 0802.3121v2 |
2008-02-26 | Interacting Quantum Dot Coupled to a Kondo Spin: A Universal Hamiltonian Study | We study a mesoscopic interacting quantum dot described by the "universal
Hamiltonian" that is coupled to a Kondo spin. The ferromagnetic exchange
interaction within the dot leads to a stepwise increase of the ground state
spin; this Stoner staircase is modified non-trivially by the Kondo interaction.
We find that the ... | 0802.3753v1 |
2008-03-04 | Parity-Violating Nuclear Force as derived from QCD Sum Rules | Parity-violating nuclear force, as may be accessed from parity violation
studies in nuclear systems, represents an area of nonleptonic weak interactions
which has been the subject of experimental investigations for several decades.
In the simple meson-exchange picture, parity-violating nuclear force may be
parameterize... | 0803.0407v1 |
2008-03-18 | Is LaO$_{1-x}$F$_x$FeAs an electron-phonon superconductor ? | In this paper we calculate the electron-phonon coupling of the
newly-discovered superconductor LaO$_{1-x}$F$_x$FeAs from first-principles,
using Density Functional Perturbation Theory. For pure LaOFeAs, the calculated
electron-phonon coupling constant $\lambda=0.21$ and logarithmic-averaged
frequency $\omega_{ln}=206 K... | 0803.2703v1 |
2008-03-22 | Quasifermion spectrum at finite temperature from coupled Schwinger-Dyson equations for a fermion-boson system | We nonperturbatively investigate a fermion spectrum at finite temperature in
a chiral invariant linear sigma model. Coupled Schwinger-Dyson equations for
fermion and boson are developed in the real time formalism and solved
numerically. From the coupling of a massless fermion with a massive boson, the
fermion spectrum ... | 0803.3257v2 |
2008-03-28 | Statefinder Diagnostic for Quintessence with or without Thermal Interaction | The cosmological dynamics of minimally coupled scalar field that couples to
the background matter with thermal interactions is investigated by using
statefinder diagnostics. The time evolution of the statefinder pairs $\{r,s\}$
and $\{r,q\}$ are obtained under the circumstance that different values of
model parameters ... | 0803.4039v1 |
2008-03-31 | Ratio of viscosity to entropy density in a strongly coupled one-component plasma | String theoretical arguments led to the hypothesis that the ratio of
viscosity to entropy of any physical system has a lower bound. Strongly coupled
systems usually have a small viscosity compared to weakly coupled plasmas in
which the viscosity is proportional to the mean free path. In the case of a
one-component plas... | 0803.4407v2 |
2008-04-17 | Dynamics in a coupled-cavity array | The dynamics of a system composed of two coupled optical cavities, each
containing a single two-level atom, is studied over a wide range of detuning
and coupling values. A description of the field in terms of delocalized modes
reveals that the detuning between the atoms and these modes is controlled by
the coupling bet... | 0804.2882v1 |
2008-04-21 | Transition from phase to generalized synchronization in time-delay systems | The notion of phase synchronization in time-delay systems, exhibiting highly
non-phase-coherent attractors, has not been realized yet even though it has
been well studied in chaotic dynamical systems without delay. We report the
identification of phase synchronization in coupled nonidentical piece-wise
linear and in co... | 0804.3270v1 |
2008-04-25 | $πB_{8}B_{8}$ and $σB_{8}B_{8}$ couplings from a chiral quark potential model | From an SU(2)$\otimes $SU(2) chiral quark potential model incorporating
spontaneous chiral symmetry breaking the asymptotic $\pi $ and $\sigma $
exchange pieces of the $NN$ potential are generated. From them the $\pi NN$ and
$\sigma NN$ coupling constants can be extracted. The generalization to
SU(3)$\otimes $SU(3) all... | 0804.4119v1 |
2008-04-25 | Coupled-resonator-induced reflection in photonic-crystal waveguide structures | We study the resonant transmission of light in a coupled-resonator optical
waveguide interacting with two nearly identical side cavities. We reveal and
describe a novel effect of the coupled-resonator-induced reflection (CRIR)
characterized by a very high and easily tunable quality factor of the
reflection line, for th... | 0804.4140v1 |
2008-05-11 | Gauss-Bonnet Cosmology with Induced Gravity and Non-Minimally Coupled Scalar Field on the Brane | We construct a cosmological model with non-minimally coupled scalar field on
the brane, where Gauss-Bonnet and Induced Gravity effects are taken into
account. This model has 5D character at both high and low energy limits but
reduces to 4D gravity in intermediate scales. While induced gravity is a
manifestation of the ... | 0805.1537v2 |
2008-05-20 | Constraints on Unparticle Interaction from $b\to s γ$ | We study unparticle effects on $b\to s \gamma$. The unparticle contributions
can contribute significantly to both left- and right-handed chirality
amplitudes. Using available experimental data and SM calculation for $B\to X_s
\gamma$, we obtain constraints on various vector and scalar unparticle
couplings. We find that... | 0805.3020v3 |
2008-05-31 | Growing drift-cyclotron modes in the hot solar atmosphere | Well-known analytical results dealing with ion cyclotron and drift waves and
which follow from the kinetic theory are used and the dispersion equation,
which describes coupled two modes, is solved numerically. The numerical results
obtained by using the values for the plasma density, magnetic field and
temperature appl... | 0806.0071v1 |
2008-06-03 | Zero-Phonon Line Broadening and Satellite Peaks in Nanowire Quantum Dots: The Role of Piezoelectric Coupling | We investigate the influence of the one-dimensional character of the phonon
modes in a catalytically grown GaAs nanowire on the absorption spectrum of an
embedded quantum dot, focusing on the contribution from the piezoelectric
coupling. In general, the reduced dimensionality of the phonons leads to
spectral side peaks... | 0806.0474v2 |
2008-06-06 | Magnetic moment of hyperons in nuclear matter by using quark-meson coupling models | We calculate the magnetic moments of hyperons in dense nuclear matter by
using relativistic quark models. Hyperons are treated as MIT bags, and the
interactions are considered to be mediated by the exchange of scalar and vector
mesons which are approximated as mean fields. Model dependence is investigated
by using the ... | 0806.1099v2 |
2008-06-17 | The development of generalized synchronization on complex networks | In this paper, we investigate the development of generalized synchronization
(GS) on typical complex networks, such as scale-free networks, small-world
networks, random networks and modular networks. By adopting the
auxiliary-system approach to networks, we show that GS can take place in
oscillator networks with both h... | 0806.2689v1 |
2008-08-07 | On the complete integrability and linearization of nonlinear ordinary differential equations - Part III: Coupled first order equations | Continuing our study on the complete integrability of nonlinear ordinary
differential equations, in this paper we consider the integrability of a system
of coupled first order nonlinear ordinary differential equations (ODEs) of both
autonomous and non-autonomous types. For this purpose, we modify the original
Prelle-Si... | 0808.0958v2 |
2008-08-07 | On the string coupling in a class of stringy orbifold GUTs | In this short note, we examine the relationship between the string coupling
constant, $\gstring{}$, and the grand unified gauge coupling constant,
$\alphagut{}$, in a highly successful class of models based on anisotropic
orbifold compactifications of the weakly coupled heterotic string. These models
represent a string... | 0808.0992v2 |
2008-08-07 | F-term SUSY Breaking and Moduli | We discuss the coupling of heavy moduli fields to light fields when the
dynamics of the latter, absent such couplings, yields metastable vacua. We show
that the survival of the vacuum structure of the local model depends
nontrivially on the cross-couplings of the two sectors. In particular we find
that for "local" mode... | 0808.1126v2 |
2008-08-12 | Slow-Roll Suppression of Adiabatic Instabilities in Coupled Scalar Field-Dark Matter Models | We study the evolution of linear density perturbations in the context of
interacting scalar field-dark matter cosmologies, where the presence of the
coupling acts as a stabilization mechanism for the runaway behavior of the
scalar self-interaction potential as in the case of the Chameleon model. We
show that in the "ad... | 0808.1646v2 |
2008-08-29 | Effect of Induced Spin-Orbit Coupling for Atoms via Laser Fields | We propose an experimental scheme to study spin-orbit coupling effects in a
of two-dimensional (2D) Fermi atomic gas cloud by coupling its internal
electronic states (pseudospins) to radiation in a delta configuration. The
induced spin-orbit coupling can be of the Dresselhaus and Rashba type with and
without a Zeeman t... | 0808.4137v2 |
2008-09-02 | Commensurate Quantum Oscillations in Coupled Qubits | We study the coupled-qubit oscillation driven by an oscillating field. When
the period of the non-resonant mode is commensurate with that of the resonant
mode of the Rabi oscillation, we show that the controlled-NOT (CNOT) gate
operation can be demonstrated. For a weak coupling the CNOT gate operation is
achievable by ... | 0809.0364v3 |
2008-09-05 | Carrier-mediated antiferromagnetic interlayer exchange coupling in diluted magnetic semiconductor multilayers Ga$_{1-x}$Mn$_x$As/GaAs:Be | We use neutron reflectometry to investigate the interlayer exchange coupling
between Ga$_{0.97}$Mn$_{0.03}$As ferromagnetic semiconductor layers separated
by non-magnetic Be-doped GaAs spacers. Polarized neutron reflectivity measured
below the Curie temperature of Ga$_{0.97}$Mn$_{0.03}$As reveals a
characteristic split... | 0809.0955v1 |
2008-09-08 | Charge effect and finite 't Hooft coupling correction on drag force and Jet Quenching Parameter | The effects of charge and finite 't Hooft coupling correction on drag force
and jet quenching parameter are investigated. To study charge effect and finite
't Hooft coupling correction, we consider Maxwell charge and Gauss-Bonnet
terms, respectively. The background is Reissner-Nordstr\"{o}m-AdS black brane
solution in ... | 0809.1336v3 |
2008-09-13 | Constraining non-minimally coupled tachyon fields by Noether symmetry | A model for a spatially flat homogeneous and isotropic Universe whose
gravitational sources are a pressureless matter field and a tachyon field
non-minimally coupled to the gravitational field is analyzed. Noether symmetry
is used to find the expressions for the potential density and for the coupling
function, and it i... | 0809.2331v2 |
2008-09-14 | Interplay between couplings and common noise in phase synchronization: disagreement between global analysis and local stability characterization | We consider two coupled phase oscillators in the presence of proportional
("common") and independent white noises. The global synchronization properties
of the system are analytically studied via the Fokker-Planck equation. When the
"effective coupling" is big compared to the common noises, the former favors
and the la... | 0809.2398v2 |
2008-09-18 | Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields | Vertically coupled double quantum rings submitted to a perpendicular magnetic
field $B$ are addressed within the local spin-density functional theory. We
describe the structure of quantum ring molecules containing up to 40 electrons
considering different inter-ring distances and intensities of the applied
magnetic fiel... | 0809.3103v1 |
2008-09-22 | A Jacobi algorithm for distributed model predictive control of dynamically coupled systems | In this paper we introduce an iterative Jacobi algorithm for solving
distributed model predictive control (DMPC) problems, with linear coupled
dynamics and convex coupled constraints. The algorithm guarantees stability and
persistent feasibility, and we provide a localized procedure for constructing
an initial feasible... | 0809.3647v1 |
2008-09-26 | Time variation of fundamental couplings and dynamical dark energy | Scalar field dynamics may give rise to a nonzero cosmological variation of
fundamental constants. Within different scenarios based on the unification of
gauge couplings, the various claimed observations and bounds may be combined in
order to trace or restrict the time history of the couplings and masses. If the
scalar ... | 0809.4628v2 |
2008-09-26 | Brownian couplings, convexity, and shy-ness | Benjamini, Burdzy and Chen (2007) introduced the notion of a shy coupling: a
coupling of a Markov process such that, for suitable starting points, there is
a positive chance of the two component processes of the coupling staying a
positive distance away from each other for all time. Among other results, they
showed no ... | 0809.4682v3 |
2008-10-03 | One- and two-photon spectroscopy of a flux qubit coupled to a microscopic defect | We observed the dynamics of a superconducting flux qubit coupled to an
extrinsic quantum system (EQS). The presence of the EQS is revealed by an
anticrossing in the spectroscopy of the qubit. The excitation of a two-photon
transition to the third excited state of the qubit-EQS system allows us to
extract detailed infor... | 0810.0590v2 |
2008-10-06 | Relating $e^+e^-$ annihilation to high energy scattering at weak and strong coupling | We explore the correspondence between the final state in e^+e^- annihilation
and the small-x hadronic wavefunction in the transverse plane both in weakly
coupled QCD and strongly coupled N=4 SYM. At strong coupling, the virtual and
static photon produced in e^+e^- annihilation can be treated as a shock wave
propagating... | 0810.0889v2 |
2008-10-14 | Piezoelectric exciton-acoustic phonon coupling in single quantum dots | Micro-photoluminescence spectroscopy at variable temperature, excitation
intensity and energy was performed on a single InAs/AlAs self-assembled quantum
dot. The exciton emission line (zero-phonon line, ZPL) exhibits a broad
sideband due to exciton-acoustic phonon coupling by the deformation potential
mechanism. Additi... | 0810.2415v1 |
2008-10-15 | Magnetic Exchange Couplings from Noncollinear Spin Density Functional Perturbation Theory | We propose a method for the evaluation of magnetic exchange couplings based
on noncollinear spin-density functional calculations. The method employs the
second derivative of the total Kohn-Sham energy of a single reference state, in
contrast to approximations based on Kohn-Sham total energy differences. The
advantage o... | 0810.2699v1 |
2008-10-30 | Duality cascade of softly broken supersymmetric theories | We study the duality cascade of softly broken supersymmetric theories. We
investigate the renormalization group (RG) flow of SUSY breaking terms as well
as supersymmetric couplings. It is found that the magnitudes of SUSY breaking
terms are suppressed in most regimes of the RG flow through the duality
cascade. At one s... | 0810.5451v1 |
2008-10-31 | Magnetoresistance in Spin-Polarized Transport through a Carbon Nanotube | We report on our theoretical study of the magnetoresistance in spin polarized
transport through a finite carbon nanotube (CNT). Varying the Fermi energy of a
CNT and the relative strength of couplings to two ferromagnetic (FM)
electrodes, we studied the conductance as well as the magnetoresistance (MR).
Due to resonant... | 0810.5719v1 |
2008-11-06 | Exchange coupling between two ferromagnetic electrodes separated by a graphene nanoribbon | In this study, based on the self-energy method and the total energy
calculation, the indirect exchange coupling between two semi-infinite
ferromagnetic strips (FM electrodes) separated by metallic graphene nanoribbons
(GNRs) is investigated. In order to form a FM/GNR/FM junction, a graphitic
region of finite length is ... | 0811.0934v1 |
2008-11-13 | Nonequilibrium mode-coupling theory for uniformly sheared systems | We develop a nonequilibrium mode-coupling theory for uniformly sheared
systems starting from microscopic, thermostatted SLLOD equations of motion. Our
theory aims at describing stationary-state properties including rheological
ones of sheared systems, and this is accomplished via two steps. Firstly, a set
of self-consi... | 0811.2120v1 |
2008-11-18 | Nambu-Poisson Bracket and M-Theory Branes Coupled to Antisymmetric Fluxes | By using the recently proposed prescription arXiv:0804.3629 for obtaining the
$M5$ brane action from multiple $M2$ branes action in BLG theory, we examine
such transition when 11 Dimensional background antisymmetric fluxes couple to
the $M2$ brane world volume. Such couplings was suggested in arXiv:0805.3427
where it w... | 0811.2976v2 |
2008-11-23 | The Relationship between Tsallis Statistics, the Fourier Transform, and Nonlinear Coupling | Tsallis statistics (or q-statistics) in nonextensive statistical mechanics is
a one-parameter description of correlated states. In this paper we use a
translated entropic index: $1 - q \to q$ . The essence of this translation is
to improve the mathematical symmetry of the q-algebra and make q directly
proportional to t... | 0811.3777v1 |
2008-12-05 | Evidence for strongly coupled charge-density-wave ordering in three-dimensional RE5Ir4Si10 compounds by optical measurements | We report optical spectra of Lu$_5$Ir$_4$Si$_{10}$ and Er$_5$Ir$_4$Si$_{10}$,
exhibiting the phenomenon of coexisting superconductivity or antiferromagnetism
and charge density wave (CDW) order. We measure the maximum value of the charge
density wave gap present on part of the Fermi surface of Lu5Ir4Si10,
corresponding... | 0812.1214v2 |
2008-12-15 | Negative Group Velocity from Quadrupole Resonance of Plasmonic Spheres | We study the dispersions of plasmonic bands that arise from the coupling of
electric quadrupole resonances in three dimensional photonic crystals (PCs)
consisting of plasmonic spheres. Through analytical derivation, we show that
two branches of quadrupole bands in simple cubic PCs with a small lattice
constant possess ... | 0812.2717v1 |
2008-12-21 | Stochastically stable globally coupled maps with bistable thermodynamic limit | We study systems of globally coupled interval maps, where the identical
individual maps have two expanding, fractional linear, onto branches, and where
the coupling is introduced via a parameter - common to all individual maps -
that depends in an analytic way on the mean field of the system. We show: 1)
For the range ... | 0812.4040v1 |
2009-01-06 | Low-loss negative refraction by laser induced magneto-electric cross-coupling | We discuss the feasibility of negative refraction with reduced absorption in
coherently driven atomic media. Coherent coupling of an electric and a magnetic
dipole transition by laser fields induces magneto-electric cross-coupling and
negative refraction at dipole densities which are considerably smaller than
necessary... | 0901.0664v1 |
2009-01-07 | Within-burst synchrony changes for coupled elliptic bursters | We study the appearance of a novel phenomenon for linearly coupled identical
bursters: synchronized bursts where there are changes of spike synchrony within
each burst. The examples we study are for normal form elliptic bursters where
there is a periodic slow passage through a Bautin (codimension two degenerate
Androno... | 0901.0874v1 |
2009-01-15 | The strong coupling constant at large distances | In this paper we discuss effective strong coupling constants. Those are well
behaved in the low-Q^2 domain, contrarily to alpha_s from pQCD. We present an
extraction of an effective strong coupling constant from Jefferson Lab
polarized data at intermediate and low Q^2. We also show how these data,
together with spin su... | 0901.2190v2 |
2009-01-24 | Residual effects of heavy sparticles in the bottom quark Yukawa coupling: a comparative study for the MSSM and NMSSM | If the sparticles are relatively heavy (a few TeV) while the Higgs sector is
not so heavy ($m_A$ is not so large), the Higgs boson Yukawa couplings can
harbor sizable quantum effects of sparticles and these large residual effects
may play a special role in probing supersymmetry at foreseeable colliders. In
this work, f... | 0901.3818v2 |
2009-01-26 | Higher Derivative Corrections to Shear Viscosity from Graviton's Effective Coupling | The shear viscosity coefficient of strongly coupled boundary gauge theory
plasma depends on the horizon value of the effective coupling of transverse
graviton moving in black hole background. The proof for the above statement is
based on the canonical form of graviton's action. But in presence of generic
higher derivat... | 0901.3848v1 |
2009-01-26 | Diverse routes to oscillation death in a coupled oscillator system | We study oscillation death (OD) in a well-known coupled-oscillator system
that has been used to model cardiovascular phenomena. We derive exact analytic
conditions that allow the prediction of OD through the two known bifurcation
routes, in the same model, and for different numbers of coupled oscillators.
Our exact ana... | 0901.4083v1 |
2009-02-11 | Constraints for weakly interacting light bosons from existence of massive neutron stars | Theories beyond the standard model include a number of new particles some of
which might be light and weakly coupled to ordinary matter. Such particles
affect equation of state of nuclear matter and can shift admissible masses of
neutron stars to higher values. The internal structure of neutron stars is
modified provid... | 0902.1825v2 |
2009-02-22 | A new scheme for the running coupling constant in gauge theories using Wilson loops | We propose a new renormalization scheme of the running coupling constant in
general gauge theories using the Wilson loops. The renormalized coupling
constant is obtained from the Creutz ratio in lattice simulations and the
corresponding perturbative coefficient at the leading order. The latter can be
calculated by adop... | 0902.3768v3 |
2009-02-23 | Polaron formation in the presence of Rashba spin-orbit coupling: implications for spintronics | We study the effects of the Rashba spin-orbit coupling on the polaron
formation, using a suitable generalization of the Momentum Average
approximation. Contrary to previous investigations of this problem, we find
that the spin-orbit interaction decreases the effective electron-phonon
coupling. It is thus possible to lo... | 0902.3853v1 |
2009-03-05 | Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets | When localized spins on different d orbitals prefer different types of
antiferromagnetic ordering, the Hund's rule coupling creates frustration. Using
spin-wave theory we study the case of two such orbitals on a square lattice
coupled through Hund's rule, such that the first one couples
antiferromagnetically (AF) more ... | 0903.0983v1 |
2009-03-19 | The Slow-Roll and Rapid-Roll Conditions in the Space-like Vector Field Scenario | In this note we derive the slow-roll and rapid-roll conditions for the
minimally and non-minimally coupled space-like vector fields. The function
$f(B^{2})$ represents the non-minimal coupling effect between vector fields and
gravity, the $f=0$ case is the minimal coupling case. For a clear comparison
with scalar field... | 0903.3269v2 |
2009-03-31 | Disappearance of quasi-fermions in the strongly coupled plasma from the Schwinger-Dyson equation with in-medium gauge boson propagator | We non-perturbatively study the fermion spectrum in the chiral symmetric
phase focusing on the effects of in-medium corrections for gauge boson. The
fermion spectrum is derived by solving the Schwinger-Dyson equation (SDE) with
ladder approximation on the real time axis. It is shown that the peak of the
fermion spectra... | 0903.5495v1 |
2009-04-05 | On the reversal of radial SLE, I: Commutation Relations in Annuli | We aim at finding the reversal of radial SLE and proving the reversibility of
whole-plane SLE. For this purpose, we define annulus SLE$(\kappa,\Lambda)$
processes in doubly connected domains with one marked boundary point. We derive
some partial differential equation for $\Lambda$, which is sufficient for the
annulus S... | 0904.0808v2 |
2009-04-08 | A Dispersive Analysis on the $f_0(600)$ and $f_0(980)$ Resonances in $γγ\toπ^+π^-, π^0π^0$ Processes | We estimate the di-photon coupling of $f_0(600)$, $f_0(980)$ and $f_2(1270)$
resonances in a coupled channel dispersive approach. The $f_0(600)$ di-photon
coupling is also reinvestigated using a single channel $T$ matrix for $\pi\pi$
scattering with better analyticity property, and it is found to be
significantly small... | 0904.1445v2 |
2009-04-13 | Magnetically tunable dielectric materials | The coupling between localized spins and phonons can lead to shifts in the
dielectric constant of insulating materials at magnetic ordering transitions.
Studies on isostructural SeCuO3 (ferromagnetic) and TeCuO3 (antiferromagnetic)
illustrate how the q-dependent spin-spin correlation function couples to phonon
frequenc... | 0904.1974v1 |
2009-04-13 | Renormalization of Oscillator Lattices with Disorder | A real-space renormalization transformation is constructed for lattices of
non-identical oscillators with dynamics of the general form
$d\phi_{k}/dt=\omega_{k}+g\sum_{l}f_{lk}(\phi_{l},\phi_{k})$. The
transformation acts on ensembles of such lattices. Critical properties
corresponding to a second order phase transition... | 0904.2013v1 |
2009-04-17 | Strong coupling of localized plasmons and molecular excitons in nanostructured silver films | We report on the resonant coupling between localized surface plasmon
resonances (LSPRs) in nanostructured Ag films, and an adsorbed monolayer of
Rhodamine 6G dye. Hybridization of the plasmons and molecular excitons creates
new coupled polaritonic modes, which have been tuned by varying the LSPR
wavelength. The resulti... | 0904.2674v1 |
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