publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2008-02-08 | Large deviations of lattice Hamiltonian dynamics coupled to stochastic thermostats | We discuss the Donsker-Varadhan theory of large deviations in the framework
of Hamiltonian systems thermostated by a Gaussian stochastic coupling. We
derive a general formula for the Donsker-Varadhan large deviation functional
for dynamics which satisfy natural properties under time reversal. Next, we
discuss the chara... | 0802.1104v2 |
2008-02-12 | Coherence Conservation of a Qubit Coupled to a Thermal Dissipating Environment | It is shown that quantum coherence is conserved in a principal system in the
case that the system is coupled to a fast dissipating environment
[arXiv:0709.0562]. The phenomenon is called the quantum wipe effect. Here, this
effect is reviewed and the analytical proof for a model system consisting of a
one-qubit system c... | 0802.1596v1 |
2008-02-13 | The supersymmetric solutions and extensions of ungauged matter-coupled N=1,d=4 supergravity | We find the most general supersymmetric solutions of ungauged N=1,d=4
supergravity coupled to an arbitrary number of vector and chiral
supermultiplets, which turn out to be essentially pp-waves and strings. We also
introduce magnetic 1-forms and their supersymmetry transformations and 2-forms
associated to the isometri... | 0802.1799v2 |
2008-02-18 | Spin-orbit coupling and crystal-field splitting in the electronic and optical properties of nitride quantum dots with a wurtzite crystal structure | We present an $sp^3$ tight-binding model for the calculation of the
electronic and optical properties of wurtzite semiconductor quantum dots (QDs).
The tight-binding model takes into account strain, piezoelectricity, spin-orbit
coupling and crystal-field splitting. Excitonic absorption spectra are
calculated using the ... | 0802.2436v1 |
2008-02-20 | Theoretical and experimental investigations of Coulomb blockade in coupled quantum dot systems | Two strongly coupled quantum dots are theoretically and experimentally
investigated. In the conductance measurements of a GaAs based low-dimensional
system additional features to the Coulomb blockade have been detected at low
temperatures. These regions of finite conductivity are compared with
theoretical investigation... | 0802.2799v1 |
2008-02-26 | Decoherence by a spin thermal bath: Role of the spin-spin interactions and initial state of the bath | 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. For the anisotropic spin-bath, changing the
connectivity or coup... | 0802.3828v1 |
2008-03-06 | Quantum information processing in a spin-bus system of coupled chains | The effective Heisenberg interaction of long distance is constructed in spin
qubits connected to a bus of two strongly coupled chains. Universal quantum
computation can be realized on the basis of the bus which always keeps frozen
at the ground state. It is found that the effective interaction is primarily
determined b... | 0803.0768v1 |
2008-03-07 | Strong electron-phonon interaction in multiband superconductors | We discuss the effects of anisotropy on superconducting critical temperature
and order parameter in a strongly coupled regime. The multiband representation
is used as a model for anisotropy. We show that strong coupling effects in
multiband superconductors lead to pair-breaking due to interband coupling
because soft ph... | 0803.1103v1 |
2008-03-10 | Four point function of R-currents in N=4 SYM in the Regge limit at weak coupling | We compute, in N=4 super Yang-Mills theory, the four point correlation
function of R-currents in the Regge limit in the leading logarithmic
approximation at weak coupling. Such a correlator is the closest analog to
photon-photon scattering within QCD, and there is a well-defined procedure to
perform the analogous compu... | 0803.1423v2 |
2008-03-11 | Gauge and Yukawa couplings in 6D supersymmetric SU(6) models | We study six-dimensional (6D) SU(6) supersymmetric models where the
doublet-triplet splitting, quark-lepton mass relations and gaugino-mediated
supersymmetry breaking are taken into account. We find that effective 4D gauge
coupling constants have highly nontrivial behavior between two compactification
scales. It is sho... | 0803.1537v1 |
2008-03-13 | Resonances for a Hydrogenic System or a Harmonic Oscillator Strongly Coupled to a Field | We calculate resonances which are formed by a particle in a potential which
is either Coulombian or quadratic when the particle is strongly coupled to a
massless boson, taking only two energy levels into consideration. From these
calculations we derive how the moving away of the particle from its attraction
center goes... | 0803.1973v1 |
2008-03-14 | An alternative scaling solution for high-energy QCD saturation with running coupling | A new type of approximate scaling compatible with the Balitsky-Kovchegov
equation with running coupling is found, which is different from the previously
known running coupling geometric scaling. The corresponding asymptotic
traveling wave solution is derived. Although featuring different scaling
behaviors, the two solu... | 0803.2167v1 |
2008-03-18 | Superconductivity in a model of two Hubbard chains coupled with ferromagnetic exchange interaction | We study the ground-state properties of the double-chain Hubbard model
coupled with ferromagnetic exchange interaction by using the weak-coupling
theory, density-matrix renormalization group technique, and Lanczos
exact-diagonalization method. We determine the ground-state phase diagram in
the parameter space of the fe... | 0803.2590v1 |
2008-03-18 | Efficient output coupling of intracavity high harmonic generation | We demonstrate a novel technique for coupling XUV harmonic radiation out of a
femtosecond enhancement cavity. We use a small-period diffraction grating
etched directly into the surface of a dielectric mirror. For the fundamental
light, this element acts as a high reflector. For harmonic wavelengths, it acts
as a diffra... | 0803.2672v1 |
2008-03-19 | On Matter Coupling in 5D Kaluza-Klein Model | We analyze some unphysical features of the geodesic approach to matter
coupling in a compactified Kaluza-Klein scenario, like the q/m puzzle and the
huge massive modes. We propose a new approach, based on Papapetrou multipole
expansion, that provides a new equation for the motion of a test particle. We
show how this eq... | 0803.2807v1 |
2008-03-20 | Short chaotic strings and their behaviour in the scaling region | Coupled map lattices are a paradigm of higher-dimensional dynamical systems
exhibiting spatio-temporal chaos. A special case of non-hyperbolic maps are
one-dimensional map lattices of coupled Chebyshev maps with periodic boundary
conditions, called chaotic strings. In this short note we show that the fine
structure of ... | 0803.2991v2 |
2008-03-20 | Non-minimally coupled vector curvaton | It is shown that a massive Abelian vector boson field can generate the
curvature perturbation in the Universe, when coupled non-minimally to gravity,
through an RA^2 coupling. The vector boson acts as a curvaton field imposing
the curvature perturbation after the end of inflation, without generating a
large-scale aniso... | 0803.3041v2 |
2008-03-20 | A Lindblad model for a spin chain coupled to heat baths | We study a XY model which consists of a spin chain coupled to heat baths. We
give a repeated quantum interaction Hamiltonian describing this model. We
compute the explicit form of the associated Lindblad generator in the case of
the spin chain coupled to one, two and several heat baths. We further study the
properties ... | 0803.3060v1 |
2008-03-25 | Universality in Globally Coupled Maps and Flows | We show that universality in chaotic elements can be lifted to that in
complex systems. We construct a globally coupled Flow lattice (GCFL), an analog
of a globally coupled Map lattice (GCML). We find that Duffing GCFL shows the
same behavior with GCML; population ratio between synchronizing clusters acts
as a bifurcat... | 0803.3589v1 |
2008-03-28 | Kondo-Dicke resonances in electronic transport through triple quantum dots | Electronic transport through a triple quantum dot system, with only a single
dot coupled directly to external leads, is considered theoretically. The model
includes Coulomb correlations in the central dot, while such correlations in
the two side-coupled dots are omitted. The infinite-U mean-field slave-boson
approach i... | 0803.4154v1 |
2008-03-31 | Quark-meson coupling model with the cloudy bag | Using the volume coupling version of the cloudy bag model, the quark-meson
coupling model is extended to study the role of pion field and the properties
of nuclear matter. The extended model includes the effect of gluon exchange as
well as the pion-cloud effect, and provides a good description of the nuclear
matter pro... | 0803.4362v1 |
2008-04-01 | Strong electron-phonon coupling of the Fe breathing mode of LaO_{1-x}F_xFeAs | The electron-phonon coupling of LaO$_{1-x}$F$_x$FeAs is re-investigated on
the basis of density functional theory in local density approximation. The
implications of the $(\pi,\pi)$ nesting of the Fermi surfaces are carefully
studied and found to lead to a non-standard electron-phonon coupling of the
corresponding Fe i... | 0804.0186v2 |
2008-04-02 | A strong coupling expansion for N=4 SYM theory and other SCFT's | Recent progress towards understanding a strong coupling expansion for various
superconformal field theories in four dimensions is described. First, the case
of the maximally supersymmetric Yang Mills theory is analyzed, as well as many
calculations that can be done directly at strong coupling and matched to the
AdS dua... | 0804.0383v1 |
2008-04-11 | Running Coupling Effects in Small-x QCD | We study effects of the running of the coupling in QCD at small Bjorken-x and
in particular the ones related to gluon saturation. After introducing the steps
taken to the derivation of the next to leading order nonlinear evolution
equation, we discuss the infrared sensitivity of the Pomeron intercept, the
energy depend... | 0804.1918v1 |
2008-04-15 | Interface-driven magnetocapacitance in a broad range of materials | Triggered by the revival of multiferroic materials, a lot of effort is
presently undergoing as to find a coupling between a capacitance and a magnetic
field. We show in this report that interfaces are the right way of increasing
such a coupling provided free charges are localized on these two-dimensional
defects. Start... | 0804.2416v1 |
2008-04-22 | A triple quantum dot in a single wall carbon nanotube | A top-gated single wall carbon nanotube is used to define three coupled
quantum dots in series between two electrodes. The additional electron number
on each quantum dot is controlled by top-gate voltages allowing for current
measurements of single, double and triple quantum dot stability diagrams.
Simulations using a ... | 0804.3441v1 |
2008-04-30 | Quantum dynamics in nonequilibrium environments | We present a formalism for studying the behaviour of quantum systems coupled
to nonequilibrium environments exhibiting nonGaussian fluctuations. We discuss
the role of a qubit as a detector of the statistics of environmental
fluctuations, as well as nonMarkovian effects in both weak and strong coupling
limits. We also ... | 0804.4869v2 |
2008-05-05 | Inferring coupling strength from event-related dynamics | We propose an approach for inferring strength of coupling between two systems
from their transient dynamics. This is of vital importance in cases where most
information is carried by the transients, for instance in evoked potentials
measured commonly in electrophysiology. We show viability of our approach using
nonline... | 0805.0532v2 |
2008-05-08 | Spin-Electric Coupling in Molecular Magnets | We study the triangular antiferromagnet Cu$_3$ in external electric fields,
using symmetry group arguments and a Hubbard model approach. We identify a
spin-electric coupling caused by an interplay between spin exchange, spin-orbit
interaction, and the chirality of the underlying spin texture of the molecular
magnet. Th... | 0805.1158v1 |
2008-05-08 | The viability of theories with matter coupled to the Ricci scalar | Recently there has been a proposal for modified gravitational f(R) actions
which include a direct coupling between the matter action and the Ricci scalar,
R. Of particular interest is the specific case where both the action and the
coupling are linear in R. It is shown that such an action leads to a theory of
gravity w... | 0805.1160v2 |
2008-05-08 | On the non-minimal gravitational coupling to matter | The connection between $f(R)$ theories of gravity and scalar-tensor models
with a "physical" metric coupled to the scalar field is well known. In this
work, we pursue the equivalence between a suitable scalar theory and a model
that generalises the $f(R)$ scenario, encompassing both a non-trivial scalar
curvature term ... | 0805.1241v2 |
2008-05-08 | Modified gravity with R-matter couplings and (non-)geodesic motion | We consider alternative theories of gravity with a direct coupling between
matter and the Ricci scalar We study the relation between these theories and
ordinary scalar-tensor gravity, or scalar-tensor theories which include
non-standard couplings between the scalar and matter. We then analyze the
motion of matter in su... | 0805.1249v2 |
2008-05-17 | Resolving disagreement for eta/s in a CFT plasma at finite coupling | The ratio of shear viscosity to entropy density in a strongly coupled CFT
plasma can be computed using the AdS/CFT correspondence either from equilibrium
correlation functions or from the Janik-Peschanski dual of the boost invariant
plasma expansion. We point out that the previously found disagreement for eta/s
at fini... | 0805.2683v1 |
2008-05-22 | On Asymptotic Stability of Solitary Waves in Discrete Schrödinger Equation Coupled to Nonlinear Oscillator | The long-time asymptotics is analyzed for finite energy solutions of the 1D
discrete Schr\"odinger equation coupled to a nonlinear oscillator. The coupled
system is invariant with respect to the phase rotation group. For initial
states close to a solitary wave, the solution converges to a sum of another
solitary wave a... | 0805.3403v1 |
2008-05-22 | Beyond the Chameleon Mechanism | As a result of non-linear self-interactions, in chameleon theories where the
field couples to matter much more strongly than gravity does, the fifth force
between two bodies with thin-shell is independent of their coupling to the
field. As a consequence the bounds on the coupling coming from terrestrial
tests of gravit... | 0805.3430v1 |
2008-05-26 | Coupling of electrons to the electromagnetic field in a localized basis | A simple formula is obtained for coupling electrons in a complex system to
the electromagnetic field. It includes the effect of intra-atomic excitations
and nuclear motion, and can be applied in. e.g., first-principles-based
simulations of the coupled dynamics of electrons and nuclei in materials and
molecules respondi... | 0805.3803v2 |
2008-05-27 | Strong coupling of light with one-dimensional quantum dot chain: from Rabi oscillations to Rabi waves | Interaction of traveling wave of classic light with 1D-chain of coupled
quantum dots (QDs) in strong coupling regime has been theoretically considered.
The effect of space propagation of Rabi oscillations in the form of traveling
waves and wave packets has been predicted. Physical interpretation of the
effect has been ... | 0805.4094v1 |
2008-06-02 | Low Dimensional Behavior of Large Systems of Globally Coupled Oscillators | It is shown that, in the infinite size limit, certain systems of globally
coupled phase oscillators display low dimensional dynamics. In particular, we
derive an explicit finite set of nonlinear ordinary differential equations for
the macroscopic evolution of the systems considered. For example, an exact,
closed form s... | 0806.0004v1 |
2008-06-03 | A gate-defined silicon quantum dot molecule | We report electron transport measurements of a silicon double dot formed in
multi-gated metal-oxide-semiconductor structures with a 15-nm-thick
silicon-on-insulator layer. Tunable tunnel coupling enables us to observe an
excitation spectrum in weakly coupled dots and an energy level anticrossing in
strongly coupled one... | 0806.0422v1 |
2008-06-09 | Implications of the anomalous top quark couplings in $B_s-\bar{B}_s$ mixing, $B \to X_s γ$ and top quark decays | Combined analysis of recent measured $\bs$ mixing and $B \to X_s \gamma$
decays provides constraints on the anomalous $\bar{t}sW$ couplings. We discuss
the perspectives to examine the anomalous $\bar{t}sW$ couplings through
CKM-suppressed $ t \to s W$ decays at the LHC. | 0806.1389v2 |
2008-06-12 | Towards the description of anisotropic plasma at strong coupling | We initiate a study of anisotropic plasma at strong coupling using the
AdS/CFT correspondence. We construct an exact dual geometry which represents a
static uniform but anisotropic system and find, that although it is singular,
it allows for a notion of `incoming' boundary conditions. We study small
fluctuations around... | 0806.2141v2 |
2008-06-20 | Quarkyonic matter in lattice QCD at strong coupling | We study the phase diagram of quark matter at finite temperature and density
in the strong coupling lattice QCD with one species of unrooted staggered
fermions including finite coupling ($1/g^2$) effects for color SU($N_c$). We
find that we may have partially chiral restored medium density matter at
$N_c=3$, which woul... | 0806.3357v3 |
2008-06-22 | Application of the GALI Method to Localization Dynamics in Nonlinear Systems | We investigate localization phenomena and stability properties of
quasiperiodic oscillations in $N$ degree of freedom Hamiltonian systems and $N$
coupled symplectic maps. In particular, we study an example of a parametrically
driven Hamiltonian lattice with only quartic coupling terms and a system of $N$
coupled standa... | 0806.3563v1 |
2008-06-23 | Counterion correlations near charged surfaces: from the weak to the strong coupling regime | A simple field theory approach is developed to model the properties of
charged, dielectric bodies and their associated counterions. This predictive
theory is able to accurately describe the properties of systems (as compared to
computer simulation data) from the weak coupling limit, where the
Poisson-Boltzmann theory w... | 0806.3716v3 |
2008-06-24 | Squarks and gluinos at a TeV e+e- collider: Testing the identity of Yukawa and gauge couplings in SUSY-QCD | Supersymmetry predicts the identity of Yukawa and gauge couplings in the QCD
sector: quark-squark-gluino = squark-squark-gluon = quark-quark-gluon. We
examine whether the quark-squark-gluino Yukawa coupling can be determined, by
methods complementary to LHC, by analyzing squark-gluino final states at a TeV
e+e- collide... | 0806.3875v1 |
2008-06-24 | Observation of lasing without inversion in a hot rubidium vapor under electromagnetically-induced transparency conditions | We have observed CW lasing without inversion in a gas of hot rubidium atoms
in an optical cavity under conditions of electromagnetically-induced
transparency (EIT). The medium is pumped coherently and resonantly by a single
``coupling'' beam which also produces EIT in the lasing transition. The
steady-state intensity e... | 0806.3993v1 |
2008-06-30 | Bolometric Detection of Quantum Shot Noise in Coupled Mesoscopic Systems | We present a new scheme to detect the quantum shot noise in coupled
mesoscopic systems. By applying the noise thermometry to the capacitively
coupled quantum point contacts (QPCs) we prove that the noise temperature of
one QPC is in perfect proportion to that of the other QPC which is driven to
non-equilibrium to gener... | 0806.4805v1 |
2008-08-07 | Probing the ZZgamma and Zgammagamma Couplings Through the Process e+e- --> nu anti-nu gamma | We study the sensitivity for testing the anomalous triple gauge couplings
$ZZ\gamma$ and $Z\gamma\gamma$ via the process $e^+e^-\to \nu \bar\nu \gamma$
at high energy linear colliders. For integrated luminosities of 500 $fb^{-1}$
and center of mass energies between 0.5 and 1.5 $TeV$, we find that this
process can provi... | 0808.0945v2 |
2008-08-07 | On the complete integrability and linearization of nonlinear ordinary differential equations - Part V: Linearization of coupled second order equations | Linearization of coupled second order nonlinear ordinary differential
equations (SNODEs) is one of the open and challenging problems in the theory of
differential equations. In this paper we describe a simple and straightforward
method to derive linearizing transformations for a class of two coupled SNODEs.
Our procedu... | 0808.0969v2 |
2008-08-09 | Quantum frustration of dissipation by a spin bath | We investigate the evolution of a central spin coupled to a spin bath without
internal dynamics. We compare the cases where the bath couples to one or two
components of the spin. It is found that the central spin dynamics is enhanced
in the latter case, which may be interpreted as a frustration of dissipation.
However,... | 0808.1377v1 |
2008-08-21 | Unconventional pairing in excitonic condensates under spin-orbit coupling | It is shown that the Rashba and Dresselhaus spin orbit couplings enhance the
conclusive power in the experiments on the excitonic condensed state by at
least three low temperature effects. First, spin orbit coupling facilitates the
photoluminescense measurements via enhancing the bright contribution in the
otherwise do... | 0808.2900v2 |
2008-08-28 | Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3 | We have investigated the magnetoelectric coupling in the lone pair containing
piezoelectric ferrimagnet Cu2OSeO3. Significant magnetocapacitance develops in
the magnetically ordered state (TC = 60 K). We find critical behavior near TC
and a divergence near the metamagnetic transition at 500 Oe. High-resolution
X-ray an... | 0808.3955v1 |
2008-09-01 | Quantum phase diagram of a spin-1/2 antiferromagnetic chain with magnetic impurity | We present the renormalization group (RG) flow diagram of a spin-half
antiferromagnetic chain with magnetic impurity and one altered link. In this
two parameters (competing interactions) model, one can find the complex phase
diagram with many interesting fixed points. There is no evidence of
intermediate stable fixed p... | 0809.0173v1 |
2008-09-04 | $B_d-\bar{B}_d$ mixing vs. $B_s-\bar{B}_s$ mixing with the anomalous $Wtb$ couplings | We explore the effects of the anomalous $tbW$ couplings on the $\bd$ mixing
and recently measured $\bs$ mixing. The combined analysis of mixings via box
diagrams with penguin decays provides strong constraints on the anomalous top
quark couplings. We find the bound from the $\bd$ mixing data is stronger than
that from ... | 0809.0751v2 |
2008-09-26 | Synchrony-optimized Networks of Non-identical Kuramoto Oscillators | In this letter we discuss a method for generating synchrony-optimized
coupling architectures of Kuramoto oscillators with a heterogeneous
distribution of native frequencies. The method allows us to relate the
properties of the coupling network to its synchronizability. These relations
were previously only established f... | 0809.4531v1 |
2008-10-06 | High-energy jet quenching in weakly-coupled quark-gluon plasmas | $\hat q$ is the average squared transverse momentum transfer per unit length
to a high-energy particle traversing a QCD medium such as a quark-gluon plasma.
We find the (UV-regulated) value of $\hat q$ to leading order in the weak
coupling limit, $\alphas(T) \ll 1$. We then use this value to generalize
previous analyti... | 0810.1026v1 |
2008-10-07 | How to compute the thermal quarkonium spectral function from first principles? | In the limit of a high temperature T and a large quark-mass M, implying a
small gauge coupling g, the heavy quark contribution to the spectral function
of the electromagnetic current can be computed systematically in the
weak-coupling expansion. We argue that the scale hierarchy relevant for
addressing the disappearanc... | 0810.1112v1 |
2008-10-08 | Quantum fluctuations in trapped time-dependent Bose-Einstein condensates | Quantum fluctuations in time-dependent, harmonically-trapped Bose-Einstein
condensates are studied within Bogoliubov theory. An eigenmode expansion of the
linear field operators permits the diagonalization of the Bogoliubov-de Gennes
equation for a stationary condensate. When trap frequency or interaction
strength are ... | 0810.1347v1 |
2008-10-15 | Synchronization Stability of Coupled Near-Identical Oscillator Network | We derive variational equations to analyze the stability of synchronization
for coupled near-identical oscillators. To study the effect of parameter
mismatch on the stability in a general fashion, we define master stability
equations and associated master stability functions, which are independent of
the network struct... | 0810.2775v1 |
2008-10-20 | Diboson Production and Couplings | We present the most recent cross section measurements for WW and WZ
production in proton-antiproton collisions with sqrt(s) = 1.96 TeV at the
Fermilab Tevatron in final states with two or three leptons, respectively,
along with limits on WWZ triple gauge couplings. We also present the combined
search for WW and WZ prod... | 0810.3443v1 |
2008-10-22 | Topological Symmetry And Existence of Partial Synchronization | We study the relationship between the partial synchronous (PaS) state and the
coupling structure in general dynamical systems. By the exact proof, we find
the sufficient and necessary condition of the existence of PaS state for the
coupling structure. Our result shows that the symmetry of the coupling
structure is not ... | 0810.4098v1 |
2008-10-23 | Charged current reactions in the NuSOnG and a test of neutrino-W couplings | We explore the physics potential of NuSOnG experiment to probe new physics
contributions to $W\mu\nu_\mu$ couplings in inverse muon decay and charged
current deep inelastic scattering processes. We show that NuSOnG provides two
order of magnitude improvement in $W\mu\nu_\mu$ compared to LEP bound at 95%
C.L.. Combining... | 0810.4318v1 |
2008-10-24 | A quantum interface between light and nuclear spins in quantum dots | The coherent coupling of flying photonic qubits to stationary matter-based
qubits is an essential building block for quantum communication networks. We
show how such a quantum interface can be realized between a traveling-wave
optical field and the polarized nuclear spins in a singly charged quantum dot
strongly couple... | 0810.4488v3 |
2008-10-25 | The $Λ$-$Σ$ coupling effect in the neutron-rich $Λ$-hypernucleus $_Λ^{10}$Li by microscopic shell model | We investigate the structure of the neutron-rich $\Lambda$-hypernucleus
$_{\Lambda}^{10}$Li by using microscopic shell-model calculations considering a
$\Lambda$-$\Sigma$ coupling effect. The calculated $\Sigma$-mixing probability
in the $_{\Lambda}^{10}$Li ground state is found to be about 0.34 % which is
coherently e... | 0810.4591v2 |
2008-10-28 | Gauge coupling constant, compositeness and supersymmetry | We point out the possibility that the magnitude of the bare gauge coupling
constant is determined theoretically in a composite model of all particles in
SUSY theories. We show explicitly in two space-time dimensions that the NL/L
SUSY relation (i.e., a SUSY compositeness condition for all particles) between
N = 2 LSUSY... | 0810.5006v4 |
2008-10-30 | Direct Evidence for Multiferroic Magnetoelectric Coupling in 0.9BiFeO3-0.1BaTiO3 | Magnetic, dielectric and calorimetric studies on 0.9BiFeO3-0.1BaTiO3 indicate
strong magnetoelectric coupling. XRD studies reveal a very remarkable change in
the rhombohedral distortion angle and a significant shift in the atomic
positions at the magnetic Tc due to an isostructural phase transition. The
calculated pola... | 0810.5418v1 |
2008-10-30 | The effect of dipole-dipole interaction for two atoms with different couplings in non-Markovian environment | Using the nonperturbative method, we study the exact entanglement dynamics of
two two-level dipole-dipole interacting atoms coupled to a common non-Markovian
reservoir with different coupling strengths. Besides analyzing the conditions
for the existence of steady state, we find, though the dipole-dipole
interaction cou... | 0810.5420v1 |
2008-10-30 | Nonequilibrium dynamics of polariton entanglement in a cluster of coupled traps | We study in detail the generation and relaxation of quantum coherences
(entanglement) in a system of coupled polariton traps. By exploiting a Lie
algebraic based super-operator technique we provide an analytical exact
solution for the Markovian dissipative dynamics (Master equation) of such
system which is valid for ar... | 0810.5485v1 |
2008-11-03 | Coupling of nitrogen-vacancy centers in diamond to a GaP waveguide | The optical coupling of guided modes in a GaP waveguide to nitrogen-vacancy
(NV) centers in diamond is demonstrated. The electric field penetration into
diamond and the loss of the guided mode are measured. The results indicate that
the GaP-diamond system could be useful for realizing coupled microcavity-NV
devices for... | 0811.0328v1 |
2008-11-04 | Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator | The spin-torque nano-oscillator in the presence of thermal fluctuation is
described by the normal form of the Hopf bifurcation with an additive white
noise. By the application of the reduction method, the amplitude-phase coupling
factor, which has a significant effect on the power spectrum of the spin-torque
nano-oscil... | 0811.0425v1 |
2008-11-04 | Jet quenching with running coupling including radiative and collisional energy losses | We calculate the nuclear modification factor for RHIC and LHC conditions
accounting for the radiative and collisional parton energy loss with the
running coupling constant.We find that the RHIC data can be explained both in
the scenario with the chemically equilibrium quark-gluon plasma and purely
gluonic plasma with s... | 0811.0445v2 |
2008-11-06 | Motion of test bodies in theories with nonminimal coupling | We derive the equations of motion of test bodies for a theory with nonminimal
coupling by means of a multipole method. The propagation equations for
pole-dipole particles are worked out for a gravity theory with a very general
coupling between the curvature scalar and the matter fields. Our results allow
for a systemat... | 0811.0913v2 |
2008-11-07 | Atomic entanglement sudden death in a strongly driven cavity QED system | We study the entanglement dynamics of strongly driven atoms off-resonantly
coupled with cavity fields. We consider conditions characterized not only by
the atom-field coupling but also by the atom-field detuning. By studying two
different models within the framework of cavity QED, we show that the so-called
atomic enta... | 0811.1079v2 |
2008-11-15 | Plykin-like attractor in non-autonomous coupled oscillators | A system of two coupled non-autonomous oscillators is considered. Dynamics of
complex amplitudes is governed by differential equations with periodic
piecewise continuous dependence of the coefficients on time. The Poincar\'{e}
map is derived explicitly. With exclusion of the overall phase, on which the
evolution of oth... | 0811.2489v1 |
2008-11-17 | ${Σ_{Q}Λ_{Q}π}$ Coupling Constant in Light Cone QCD Sum Rules | The strong coupling constants $g_{{\Sigma_{Q}\Lambda_{Q}\pi}}$ ($Q=b$ and
$c$) are studied in the framework of the light cone QCD sum rules using the
most general form of the baryonic currents. The predicted coupling constants
are used to estimate the decay widths for the
$\Sigma_{Q}\longrightarrow\Lambda_{Q}\pi$ decay... | 0811.2695v2 |
2008-11-17 | Correlated electron tunneling through two separate quantum dot systems with strong capacitive interdot coupling | A system consisting of two independently contacted quantum dots with strong
electrostatic interaction shows interdot Coulomb blockade when the dots are
weakly tunnel coupled to their leads. It is studied experimentally how the
blockade can be overcome by correlated tunneling when tunnel coupling to the
leads increases.... | 0811.2697v1 |
2008-11-20 | Reconstructing a String-Inspired Non-minimally Coupled Quintom Model | Motivated by the recent work of Zhang and Chen \cite{bin}, we generalize
their work to the non-minimally coupled case. We consider a quintom model of
dark energy with a single scalar field $T$ given by a Lagrangian which inspired
by tachyonic Lagrangian in string theory. We consider non-minimal coupling of
tachyon fiel... | 0811.3343v1 |
2008-11-30 | Collective dynamical response of coupled oscillators with any network structure | We formulate a reduction theory that describes the response of an oscillator
network as a whole to external forcing applied nonuniformly to its constituent
oscillators. The phase description of multiple oscillator networks coupled
weakly is also developed. General formulae for the collective phase sensitivity
and the e... | 0812.0118v1 |
2008-12-04 | Heavy-quark energy loss and thermalization in a strongly coupled SYM plasma | Using the AdS/CFT correspondence, we compute the radiative energy loss of a
slowly decelerating heavy quark with mass M moving through a supersymmetric
Yang Mills (SYM) plasma at temperature T at large t'Hooft coupling \lambda. The
calculation is carried out in terms of perturbation in \sqrt{\lambda}T/M, and
the rate o... | 0812.1051v1 |
2008-12-05 | Phase-diffusion dynamics in weakly coupled Bose-Einstein condensates | We study the phase-sensitivity of collisional phase-diffusion between weakly
coupled Bose-Einstein condensates, using a semiclassical picture of the
two-mode Bose-Hubbard model. When weak-coupling is allowed, zero relative phase
locking is attained in the Josephson-Fock transition regime, whereas a $\pi$
relative phase... | 0812.1204v2 |
2008-12-12 | Time-resolved lasing action from single and coupled photonic crystal nanocavity array lasers emitting in the telecom-band | We measure the lasing dynamics of single and coupled photonic crystal
nanocavity array lasers fabricated in the indium gallium arsenide phosphide
material system. Under short optical excitation, single cavity lasers produce
pulses as fast as 11 ps (FWHM), while coupled cavity lasers show significantly
longer lasing dur... | 0812.2287v1 |
2008-12-16 | Equivalence between supersymmetric self-dual and Maxwell-Chern-Simons models coupled to a matter spinor superfield | We study the duality of the supersymmetric self-dual and Maxwell-Chern-Simons
theories coupled to a fermionic matter superfield, using a master action. This
approach evades the difficulties inherent to the quartic couplings that appear
when matter is represented by a scalar superfield. The price is that the
spinorial m... | 0812.3134v2 |
2008-12-19 | Origin of the Ising Ferrimagnetism and Spin-Charge Coupling in LuFe2O4 | The spin ordering and spin-charge coupling in LuFe2O4 were investigated on
the basis of density functional calculations and Monte Carlo simulations. The
2:1 ferrimagnetism arises from the strong antiferromagnetic intra-sheet
Fe3+-Fe3+ and Fe3+ -Fe2+ as well as some substantial antiferromagnetic
Fe2+-Fe3+ inter-sheet sp... | 0812.3897v1 |
2008-12-28 | Yukawa Couplings and Effective Interactions in Gauge-Higgs Unification | The wave functions and Yukawa couplings of the top and bottom quarks in the
SO(5) x U(1) gauge-Higgs unification model are determined. The result is
summarized in the effective interactions for \hat \theta_H(x) = \theta_H +
H(x)/f_H where \theta_H is the Wilson line phase and H(x) is the 4D Higgs
field. The Yukawa, WWH... | 0812.4782v3 |
2008-12-31 | Effects of low-frequency noise cross-correlations in coupled superconducting qubits | We study the effects of correlated low frequency noise sources acting on a
two qubit gate in a fixed coupling scheme. A phenomenological model for the
spatial and cross-talk correlations is introduced. The decoherence inside the
SWAP subspace is analysed by combining analytic results based on the adiabatic
approximatio... | 0901.0083v1 |
2008-12-31 | Generating solutions via sigma-models | We review recent development of solution-generating techniques for four and
five-dimensional Einstein equations coupled to vector and scalar fields. This
includes D=4 Einstein-Maxwell-dilaton-axion theory with multiple vector fields,
D=5 Einstein-Maxwell gravity with the Chern-Simons term (minimal
five-dimensional supe... | 0901.0098v1 |
2009-01-05 | Janus and Multifaced Supersymmetric Theories II | We explore the physics of supersymmetric Janus gauge theories in four
dimension with spatial dependent coupling constants, e^2 and theta. For the 8
supersymmetric case, we study the vacuum and BPS spectrum, and the physics of a
sharp interface where the couple constants jump. We also find less
supersymmetric cases eith... | 0901.0506v3 |
2009-01-07 | Interplay of coupling and superradiant emmision in the optical response of a double quantum dot | We study theoretically the optical response of a double quantum dot structure
to an ultrafast optical excitation. We show that the interplay of a specific
type of coupling between the dots and their collective interaction with the
radiative environment leads to very characteristic features in the
time-resolved luminesc... | 0901.0879v2 |
2009-01-08 | Interlayer coupling enhanced by the interface roughness | Previous experiment on Fe/Cr/Fe(001) trilayers reported a surprising
observation that the interlayer exchange coupling could be enhanced drastically
by the bombardment of irradiation even at low fluences. We propose that it is
due to the resonant states in the spacer, made possible when the topography of
both interface... | 0901.0965v1 |
2009-01-11 | A non-linear hardening model based on two coupled internal hardening variables: formulation and implementation | An elasto-plasticity model with coupled hardening variables of strain type is
presented. In the theoretical framework of generalized associativity, the
formulation of this model is based on the introduction of two hardening
variables with a coupled evolution. Even if the corresponding hardening rules
are linear, the st... | 0901.1449v1 |
2009-01-14 | Interface coupling properties and reflection of bulk spin waves from biaxial multilayer ferromagnetic media | The reflection coefficient of bulk spin waves from multilayer ferromagnetic
structure with periodically modulated parameters of exchange interaction,
uniaxial and rhombic magnetic anisotropy and saturation magnetization is
calculated with a non-ideal coupling between layers. The strong dependence of
spin-wave reflectio... | 0901.2012v1 |
2009-01-15 | Fermions Coupled to Emergent Noncommutative Gravity | We study the coupling of fermions to Yang-Mills matrix models in the
framework of emergent noncommutative gravity. It is shown that the matrix model
action provides an appropriate coupling for fermions to gravity, albeit with a
non-standard spin-connection. Integrating out the fermions in a nontrivial
geometrical backg... | 0901.2322v1 |
2009-01-16 | Synchronization of dissipative dynamical systems driven by non-Gaussian Levy noises | Dynamical systems driven by Gaussian noises have been considered extensively
in modeling, simulation and theory. However, complex systems in engineering and
science are often subject to non-Gaussian fluctuations or uncertainties. A
coupled dynamical system under non- Gaussian Levy noises is considered. After
discussing... | 0901.2446v1 |
2009-01-16 | Magnetic Moment Coupling to Circularly Polarized Photons | Exact stationary solutions of the wave equation are obtained to describe the
interaction between magnetic moment of elementary particle and circularly
polarized photons. The obtained solutions substantially modify the conventional
model of field-matter interaction. It follows from them that magnetic moment
couples to p... | 0901.2501v3 |
2009-01-23 | Quantum jumps and spin dynamics of interacting atoms in a strongly coupled atom-cavity system | We experimentally investigate the spin dynamics of one and two neutral atoms
strongly coupled to a high finesse optical cavity. We observe quantum jumps
between hyperfine ground states of a single atom. The interaction-induced
normal mode splitting of the atom-cavity system is measured via the atomic
excitation. Moreov... | 0901.3738v2 |
2009-01-30 | Sensitivity to the Higgs Self-coupling Using the ZHH Channel | The Standard Model predicts the value of the Higgs self-coupling but it
cannot be measured at LHC. This measurement requires a machine such as the
proposed International Linear Collider. Here, the sensitivity to the Higgs
self-coupling is evaluated using the ZHH to six jets channel for a Higgs mass
of 120GeV/c^{2}. Ful... | 0901.4895v1 |
2009-01-31 | Heavy Charged Gauge Bosons with General CP Violating Couplings | Heavy gauge bosons such as $W^{\prime}$ are expected to exist in many
extensions of the Standard Model. In this paper, it is shown that the most
general Lagrangian for the interaction of $W^{\prime}$ with top and bottom
quarks which consists of V-A and V+A structure with in general complex
couplings produces an Electri... | 0902.0059v2 |
2009-02-06 | Singular perturbation near mode-coupling transition | We study the simplest mode-coupling equation which describes the time
correlation function of the spherical p-spin glass model. We formulate a
systematic perturbation theory near the mode-coupling transition point by
introducing multiple time scales. In this formulation, the invariance with
respect to the dilatation of... | 0902.1010v2 |
2009-02-26 | Qubit protection in nuclear-spin quantum dot memories | We present a mechanism to protect quantum information stored in an ensemble
of nuclear spins in a semiconductor quantum dot. When the dot is charged the
nuclei interact with the spin of the excess electron through the hyperfine
coupling. If this coupling is made off-resonant it leads to an energy gap
between the collec... | 0902.4566v1 |
2009-02-27 | Quantum phase transition in quantum dot trimers | We investigate a system of three tunnel-coupled semiconductor quantum dots in
a triangular geometry, one of which is connected to a metallic lead, in the
regime where each dot is essentially singly occupied. Both ferro- and
antiferromagnetic spin-1/2 Kondo regimes, separated by a quantum phase
transition, are shown to ... | 0902.4816v1 |
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