publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2007-09-07 | Adiabatic instability in coupled dark energy-dark matter models | We consider theories in which there exists a nontrivial coupling between the
dark matter sector and the sector responsible for the acceleration of the
universe. Such theories can possess an adiabatic regime in which the
quintessence field always sits at the minimum of its effective potential, which
is set by the local ... | 0709.1128v2 |
2007-09-12 | Spectra, triple and quartic gauge couplings in a Higgsless model | Spectra, triple and quartic gauge couplings of the Higgsless model with gauge
group $SU(2)_L\times SU(2)_R\times U(1)_{B-L}$ defined in warped space are
explored with numerical method. We extend the equation of motions, boundary
conditions and formalism of multi-gauge-boson vertices to the Hirn-Sanz
scenario. By assumi... | 0709.1898v2 |
2007-09-24 | Spin phonon induced colinear order and magnetization plateaus in triangular and kagome antiferromagnets. Applications to CuFeO_2 | Coupling between spin and lattice degrees of freedom are important in
geometrically frustrated magnets where they can lead to degeneracy lifting and
novel orders. We show that moderate spin-lattice couplings in triangular and
Kagome antiferromagnets can induce complex colinear magnetic orders. When
classical Heisenberg... | 0709.3546v1 |
2007-09-27 | Modulation of bilayer quantum Hall states by tilted-field-induced subband-Landau-level coupling | We study effects of tilted magnetic fields on energy levels in a
double-quantum-well (DQW) system, focusing on the coupling of subbands and
Landau levels (LLs). The subband-LL coupling induces anticrossings between LLs,
manifested directly in the magnetoresistance. The anticrossing gap becomes
larger than the spin spli... | 0709.4306v1 |
2007-10-03 | Corrections to the running of gauge couplings due to quantum gravity | Concerning the gravitational corrections to the running of gauge couplings
two different results were reported. Some authors claim that gravitational
correction at the one-loop level indicates an interesting effect of universal
gravitational decreasing of gauge couplings, that is, gravitational correction
works univers... | 0710.0713v2 |
2007-10-24 | Exponentially Modified QCD Coupling | We present a specific class of models for an infrared-finite analytic QCD
coupling, such that at large space-like energy scales the coupling differs from
the perturbative one by less than any inverse power of the energy scale. This
condition is motivated by the ITEP Operator Product Expansion philosophy.
Allowed by the... | 0710.4530v2 |
2007-11-06 | Synchronization of phase oscillators with heterogeneous coupling: A solvable case | We consider an extension of Kuramoto's model of coupled phase oscillators
where oscillator pairs interact with different strengths. When the coupling
coefficient of each pair can be separated into two different factors, each one
associated to an oscillator, Kuramoto's theory for the transition to
synchronization can be... | 0711.0884v1 |
2008-01-28 | Measuring Z' couplings at the LHC | We study the properties of potential new Z' gauge bosons produced through the
Drell-Yan mechanism at the LHC. Our analysis is performed using a fully
differential next-to-leading order QCD calculation with spin correlations,
interference effects, and experimental acceptances included. We examine the
distinguishability ... | 0801.4389v2 |
2008-02-08 | Infrared behavior of the running coupling in scalar field theory | We compute the Green function of the massless scalar field theory in the
infrared till the next-to-leading order, providing a fully covariant strong
coupling expansion. Applying Callan-Symanzik equation we obtain the exact
running coupling for this case by computing the beta function. This result is
applied using a rec... | 0802.1183v4 |
2008-04-02 | Dark Matter - Dark Energy coupling biasing parameter estimates from CMB data | When CMB data are used to derive cosmological parameters, their very choice
does matter: some parameter values can be biased if the parameter space does
not cover the "true" model. This is a problem, because of the difficulty to
parametrize Dark Energy (DE) physics. We test this risk through numerical
experiments. We c... | 0804.0285v2 |
2008-04-29 | The phase structure of Einstein-Cartan theory | In the Einstein-Cartan theory of torsion-free gravity coupling to massless
fermions, the four-fermion interaction is induced and its strength is a
function of the gravitational and gauge couplings, as well as the Immirzi
parameter. We study the dynamics of the four-fermion interaction to determine
whether effective bil... | 0804.4619v2 |
2008-05-13 | Janus field theories from multiple M2 branes | Based on the recent proposal of N=8 superconformal gauge theories of the
multiple M2 branes, we derive (2+1)-dimensional supersymmetric Janus field
theories with a space-time dependent coupling constant. From the original
Bagger-Lambert model, we get a supersymmetric field theory with a similar
action to the N D2 brane... | 0805.1895v3 |
2008-05-23 | New Mechanics of Traumatic Brain Injury | The prediction and prevention of traumatic brain injury is a very important
aspect of preventive medical science. This paper proposes a new coupled
loading-rate hypothesis for the traumatic brain injury (TBI), which states that
the main cause of the TBI is an external Euclidean jolt, or SE(3)-jolt, an
impulsive loading... | 0805.3583v3 |
2008-08-05 | Unifying cosmological and recent time variations of fundamental couplings | A number of positive and null results on the time variation of fundamental
constants have been reported. It is difficult to judge whether or not these
claims are mutually consistent, since the observable quantities depend on
several parameters, namely the coupling strengths and masses of particles. The
evolution of the... | 0808.0702v2 |
2008-08-07 | Constraining Interactions in Cosmology's Dark Sector | We consider the cosmological constraints on theories in which there exists a
nontrivial coupling between the dark matter sector and the sector responsible
for the acceleration of the universe, in light of the most recent supernovae,
large scale structure and cosmic microwave background data. For a variety of
models, we... | 0808.1105v1 |
2008-08-24 | Photon blockade and nonlinear effects for a quantum dot strongly coupled to a semiconductor microcavity | Our model comprehensively simulates modern nanoscale semiconductor
microcavities incorporating cavity quantum electrodynamics within both the weak
and strong coupling regimes, using on-resonant laser excitation and nonresonant
excitation due to a wetting layer. For weak coupling, the most significant
effect is photon a... | 0808.3280v3 |
2008-09-17 | Cavity-QED based on collective magnetic dipole coupling: spin ensembles as hybrid two-level systems | We analyze the magnetic dipole coupling of an ensemble of spins to a
superconducting microwave stripline structure, incorporating a Josephson
junction based transmon qubit. We show that this system is described by an
embedded Jaynes-Cummings model: in the strong coupling regime, collective
spin-wave excitations of the ... | 0809.2909v1 |
2008-09-27 | Late-time acceleration and Phantom Divide Line Crossing with Non-minimal Coupling and Lorentz Invariance Violation | We consider two alternative dark energy models: a Lorentz invariance
preserving model with a nonminimally coupled scalar field and a Lorentz
invariance violating model with a minimally coupled scalar field. We study
accelerated expansion and dynamics of equation of state parameter in these
scenarios. While a minimally ... | 0809.4744v1 |
2008-09-29 | Contact conductance between graphene and quantum wires | The contact conductance between graphene and two quantum wires which serve as
the leads to connect graphene and electron reservoirs is theoretically studied.
Our investigation indicates that the contact conductance depends sensitively on
the graphene-lead coupling configuration. When each quantum wire couples solely
to... | 0809.4911v1 |
2008-10-01 | Concentration inequalities for Markov processes via coupling | We obtain moment and Gaussian bounds for general Lipschitz functions
evaluated along the sample path of a Markov chain. We treat Markov chains on
general (possibly unbounded) state spaces via a coupling method. If the first
moment of the coupling time exists, then we obtain a variance inequality. If a
moment of order 1... | 0810.0097v4 |
2008-10-07 | The synchronization transition in correlated oscillator populations | The synchronization transition of correlated ensembles of coupled Kuramoto
oscillators on sparse random networks is investigated. Extensive numerical
simulations show that correlations between the native frequencies of adjacent
oscillators on the network systematically shift the critical point as well as
the critical e... | 0810.1121v2 |
2008-10-28 | Superfluid Bose-Fermi mixture from weak-coupling to unitarity | We investigate the zero-temperature properties of a superfluid Bose-Fermi
mixture by introducing a set of coupled Galilei-invariant nonlinear
Schr\"odinger equations valid from weak-coupling to unitarity. The Bose
dynamics is described by a Gross-Pitaevskii-type equation including
beyond-mean-field corrections possessi... | 0810.5046v1 |
2008-11-23 | The quantum optical Josephson interferometer | The interplay between coherent tunnel coupling and on-site interactions in
dissipation-free bosonic systems has lead to many spectacular observations,
ranging from the demonstration of number-phase uncertainty relation to quantum
phase transitions. To explore the effect of dissipation and coherent drive on
tunnel coupl... | 0811.3762v1 |
2008-12-03 | Z(N) Domain walls in hot N=4 SYM at weak and strong coupling | We study the tensions of domain walls in the deconfined phase of N=4 SUSY
Yang-Mills theory on R^3 x S^1, at weak and strong coupling. We calculate the
k-wall tension at one-loop order and find that it is proportional to k(N-k)
(Casimir scaling). The two-loops analysis suggests that Casimir scaling
persists to this ord... | 0812.0773v3 |
2008-12-11 | Optical conductivity in the t-J-Holstein Model | Using recently developed numerical method we compute charge stiffness and
optical conductivity of the t-J model coupled to optical phonons. Coherent hole
motion is most strongly influenced by the electron-phonon coupling within the
physically relevant regime of the exchange interaction. We find unusual
non-monotonous d... | 0812.2131v1 |
2008-12-17 | The strong-coupling limit of lattice Landau gauge | We report on our recent study of the gluon and ghost propagators of pure
SU(2) minimal lattice Landau gauge in the strong-coupling limit. In this limit,
we find evidence of the conformal infrared behaviour of these propagators as
predicted by functional continuum methods. However, in the strong-coupling
limit this happ... | 0812.3268v1 |
2008-12-30 | Non-minimally coupled scalar field cosmology on the phase plane | In this publication we investigate dynamics of a flat FRW cosmological model
with a non-minimally coupled scalar field with the coupling term $\xi R
\psi^{2}$ in the scalar field action. The quadratic potential function
$V(\psi)\propto \psi^{2}$ is assumed. All the evolutional paths are visualized
and classified in the... | 0812.5096v2 |
2009-01-28 | Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces | We study the exchange coupling mediated by itinerant carriers with spin-orbit
interaction by both analytic and numeric approaches. The mediated exchange
coupling is non-collinear and its spatial trends depend on the Fermi surface
topology of the itinerant carriers. Taking Rashba interaction as an example,
the exchange ... | 0901.4577v1 |
2009-02-16 | Coupling between cold dark matter and dark energy from neutrino mass experiments | We consider cosmological models with dynamical dark energy (dDE) coupled to
cold dark matter (CDM), while simultaneously allowing neutrinos to be massive.
Using a MCMC approach, we compare these models with a wide range of
cosmological data sets. We find a strong correlation between this coupling
strength and the neutr... | 0902.2737v3 |
2009-03-23 | Interplay of noise and coupling in heterogeneous ensembles of phase oscillators | We study the effects of noise on the collective dynamics of an ensemble of
coupled phase oscillators whose natural frequencies are all identical, but
whose coupling strengths are not the same all over the ensemble. The intensity
of noise can also be heterogeneous, representing diversity in the individual
responses to e... | 0903.3860v1 |
2009-04-01 | Chemical trend of exchange couplings in diluted magnetic II-VI semiconductors | We have calculated the chemical trend of magnetic exchange parameters
($J_{dd}$, $N \alpha$, and $N \beta$) of Zn-based II-VI semiconductors ZnA
(A=O, S, Se, and Te) doped with Co or Mn. We show that a proper treatment of
electron correlations by the LSDA+$U$ method leads to good agreement between
experimental and theo... | 0904.0121v1 |
2009-04-07 | Curvature-enhanced spin-orbit coupling in a carbon nanotube | Structure of the spin-orbit coupling varies from material to material and
thus finding the correct spin-orbit coupling structure is an important step
towards advanced spintronic applications. We show theoretically that the
curvature in a carbon nanotube generates two types of the spin-orbit coupling,
one of which was n... | 0904.1185v2 |
2009-04-13 | Coupling dark energy with Standard Model states | In this contribution one examines the coupling of dark energy to the gauge
fields, to neutrinos, and to the Higgs field. In the first case, one shows how
a putative evolution of the fundamental couplings of strong and weak
interactions via coupling to dark energy through a generalized Bekenstein-type
model may cause de... | 0904.1933v1 |
2009-04-15 | Asymmetry--induced effects in coupled phase oscillator ensembles: Routes to synchronization | A system of two coupled ensembles of phase oscillators can follow different
routes to inter-ensemble synchronization. Following a short report of our
preliminary results [Phys. Rev. E. {\bf 78}, 025201(R) (2008)], we present a
more detailed study of the effects of coupling, noise and phase asymmetries in
coupled phase ... | 0904.2239v1 |
2009-04-15 | Inverse synchronizations in coupled time-delay systems with inhibitory coupling | Transitions between inverse anticipatory, inverse complete and inverse lag
synchronizations are shown to occur as a function of the coupling delay in
unidirectionally coupled time-delay systems with inhibitory coupling. We have
also shown that the same general asymptotic stability condition obtained using
the Krasovski... | 0904.2251v1 |
2009-05-19 | Phase structure of thermal lattice QCD with N_f=2 twisted mass Wilson fermions | We present numerical results for the phase diagram of lattice QCD at finite
temperature in the formulation with twisted mass Wilson fermions and a
tree-level Symanzik-improved gauge action. Our simulations are performed on
lattices with temporal extent N_\tau=8, and lattice coupling \beta ranging from
strong coupling t... | 0905.3112v2 |
2009-05-28 | The Coupling of Chern-Simons Theory to Topological Gravity | We couple Chern-Simons gauge theory to 3-dimensional topological gravity with
the aim of investigating its quantum topological invariance. We derive the
relevant BRST rules and Batalin-Vilkovisky action. Standard BRST
transformations of the gauge field are modified by terms involving both its
anti-field and the super-g... | 0905.4631v3 |
2009-05-31 | K-Inflation with a Dark Energy Coupling | It is usually thought that the quintessence as a fundamental scalar field was
already present during the inflationary epoch. While there are various models
in which the quintessence couples to other species, it is attractive to
anticipate a coupling between the quintessence and the inflaton in the very
early universe a... | 0906.0145v4 |
2009-07-03 | Universality in the one-dimensional chain of phase-coupled oscillators | We apply a recently developed renormalization group (RG) method to study
synchronization in a one-dimensional chain of phase-coupled oscillators in the
regime of weak randomness. The RG predicts how oscillators with randomly
distributed frequencies and couplings form frequency-synchronized clusters.
Although the RG was... | 0907.0511v3 |
2009-09-01 | SU(5) orientifolds, Yukawa couplings, Stringy Instantons and Proton Decay | We construct a large class of SU(5) orientifold vacua with tadpole
cancellation both for the standard and the flipped case. We give a general
analysis of superpotential couplings up to quartic order in orientifold vacua
and identify the properties of needed Yukawa couplings as well as the baryon
number violating coupli... | 0909.0271v2 |
2009-09-18 | Vacuum degeneracy of a circuit-QED system in the ultrastrong coupling regime | We investigate theoretically the quantum vacuum properties of a chain of $N$
superconducting Josephson atoms inductively coupled to a transmission line
resonator. We derive the quantum field Hamiltonian for such circuit-QED system,
showing that, due to the type and strength of the interaction, a quantum phase
transitio... | 0909.3505v3 |
2009-09-21 | Suppression of radiation loss by hybridization effect in two coupled split-ring resonators | This paper investigates the radiation properties of two coupled split-ring
resonators (SRRs). Due to electromagnetic coupling, two hybrid magnetic plasmon
modes were induced in the structure. Our calculations show that the radiation
loss of the structure was greatly suppressed by the hybridization effect. This
led to a... | 0909.3751v1 |
2009-10-16 | Current-induced spin polarization for a general two-dimensional electron system | In this paper, current-induced spin polarization for two-dimensional electron
gas with a general spin-orbit interaction is investigated. For isotropic energy
spectrum, the in-plane current-induced spin polarization is found to be
dependent on the electron density for non-linear spin-orbit interaction and
increases with... | 0910.3050v1 |
2009-10-29 | Cosmological Constraints on Strongly Coupled Moduli from Cosmic Strings | Cosmological constraints on moduli, whose coupling to matter is stronger than
Planck mass suppressed coupling, are derived. In particular, moduli are
considered to be produced by oscillating loops of cosmic strings and
constraints are obtained from their effects on big bang nucleosynthesis and
their contribution to dif... | 0910.5544v1 |
2009-10-30 | Gap symmetries from the neighbor coupling in square-lattice superconductors | The gap symmetries of superconductivity are studied in this work. It is found
that the gap symmetries are simply determined by the 4-fold rotational
symmetries of the coupling potential on neighbor sites. A local on-site
coupling potential results in the on-site pairing with the conventional s-wave
symmetry, but a coup... | 0910.5871v2 |
2010-01-22 | RKKY coupling in graphene | We study the carrier-mediated exchange interaction, the so-called RKKY
coupling, between two magnetic moments in graphene using exact diagonalization
on the honeycomb lattice. By using the tight-binding nearest neighbor band
structure of graphene we avoid the use of a momentum cut-off which plagues
results in the Dirac... | 1001.4024v2 |
2010-01-25 | Spin relaxation due to deflection coupling in nanotube quantum dots | We consider relaxation of an electron spin in a nanotube quantum dot due to
its coupling to flexural phonon modes, and identify a new spin-orbit mediated
coupling between the nanotube deflection and the electron spin. This mechanism
dominates other spin relaxation mechanisms in the limit of small energy
transfers. Due ... | 1001.4306v2 |
2010-02-12 | Stability and chaos in coupled two-dimensional maps on Gene Regulatory Network of bacterium E.Coli | The collective dynamics of coupled two-dimensional chaotic maps on complex
networks is known to exhibit a rich variety of emergent properties which
crucially depend on the underlying network topology. We investigate the
collective motion of Chirikov standard maps interacting with time delay through
directed links of Ge... | 1002.2600v2 |
2010-02-23 | Coupling time distribution asymptotics for some couplings of the Levy stochastic area | We exhibit some explicit co-adapted couplings for n-dimensional Brownian
motion and all its Levy stochastic areas. In the two-dimensional case we show
how to derive exact asymptotics for the coupling time under various mixed
coupling strategies, using Dufresne's formula for the distribution of
exponential functionals o... | 1002.4348v1 |
2010-03-10 | Finite size effects on transport coefficients for models of atomic wires coupled to phonons | We consider models of quasi-1-d, planar atomic wires consisting of several,
laterally coupled rows of atoms, with mutually non-interacting electrons. This
electronic wire system is coupled to phonons, corresponding, e.g., to some
substrate. We aim at computing diffusion coefficients in dependence on the wire
widths and... | 1003.2156v2 |
2010-03-25 | Complete synchronization in coupled Type-I neurons | For a system of type-I neurons bidirectionally coupled through a nonlinear
feedback mechanism, we discuss the issue of noise-induced complete
synchronization (CS). For the inputs to the neurons, we point out that the rate
of change of instantaneous frequency with the instantaneous phase of the
stochastic inputs to each... | 1003.4980v1 |
2010-03-26 | Microscopically-constrained Fock energy density functionals from chiral effective field theory. I. Two-nucleon interactions | The density matrix expansion (DME) of Negele and Vautherin is a convenient
tool to map finite-range physics associated with vacuum two- and three-nucleon
interactions into the form of a Skyme-like energy density functional (EDF) with
density-dependent couplings. In this work, we apply the improved formulation of
the DM... | 1003.5210v1 |
2010-04-08 | Coupling of bonding and antibonding electron orbitals in double quantum dots by spin-orbit interaction | We perform a systematic exact diagonalization study of spin-orbit coupling
effects for stationary few-electron states confined in quasi two-dimensional
double quantum dots. We describe the spin-orbit-interaction induced coupling
between bonding and antibonding orbitals and its consequences for
magneto-optical absorptio... | 1004.1250v1 |
2010-04-18 | Chiral symmetry breaking and monopole dynamics in non-compact QED3 coupled to a four-fermi interaction | We present results from the first lattice simulations of three dimensional
non-compact quantum electrodynamics (QED3) with N_f four-component fermion
flavors coupled to a weak Z(2) chirally invariant four-fermi interaction.
Results with $N_f \ge 4$ show that the scaling near the strong coupling chiral
transition or sha... | 1004.3053v3 |
2010-04-20 | Geometric phase as a determinant of a qubit--environment coupling | We investigate the qubit geometric phase and its properties in dependence on
the mechanism for decoherence of a qubit weakly coupled to its environment. We
consider two sources of decoherence: dephasing coupling (without exchange of
energy with environment) and dissipative coupling (with exchange of energy).
Reduced dy... | 1004.3432v1 |
2010-07-22 | Precision Gauge Unification from Extra Yukawa Couplings | We investigate the impact of extra vector-like GUT multiplets on the
predicted value of the strong coupling. We find in particular that Yukawa
couplings between such extra multiplets and the MSSM Higgs doublets can resolve
the familiar two-loop discrepancy between the SUSY GUT prediction and the
measured value of alpha... | 1007.3990v6 |
2010-09-03 | Determination of effective microscopic models for the frustrated antiferromagnets Cs$_2$CuCl$_4$ and Cs$_2$CuBr$_4$ by density functional methods | We investigate the electronic and magnetic properties of the frustrated
triangular-lattice antiferromagnets Cs$_2$CuCl$_4$ and Cs$_2$CuBr$_4$ in the
framework of density functional theory. Analysis of the exchange couplings J
and J' using the available X-ray structural data corroborates the values
obtained from experim... | 1009.0697v2 |
2010-10-15 | Sharp transition for single polarons in the one-dimensional Su-Schrieffer-Heeger model | We study a single polaron in the Su-Schrieffer-Heeger (SSH) model using four
different techniques (three numerical and one analytical). Polarons show a
smooth crossover from weak to strong coupling, as a function of the
electron-phonon coupling strength $\lambda$, in all models where this coupling
depends only on phono... | 1010.3207v2 |
2010-10-18 | Determining the Electron-Phonon Coupling Strength in Correlated Electron Systems from Resonant Inelastic X-ray Scattering | We show that high resolution Resonant Inelastic X-ray Scattering (RIXS)
provides direct, element-specific and momentum-resolved information on the
electron-phonon (e-p) coupling strength. Our theoretical analysis demonstrates
that the e-p coupling can be extracted from RIXS spectra by determining the
differential phono... | 1010.3565v1 |
2010-10-29 | Effective coupling parameter for 2D Yukawa liquids and non-invasive measurement of plasma parameters | We derive an effective coupling parameter for two-dimensional Yukawa systems
based on the height of the first maximum of the pair distribution function. Two
variants -- one valid in the high-coupling range, the other for arbitrary
couplings of the liquid -- are derived. Comparison to previous approaches to
Yukawa coupl... | 1010.6193v1 |
2010-11-19 | Electromagnetically induced transparency in hybrid plasmonic-dielectric system | We present theoretical and numerical analysis of a plasmonic-dielectric
hybrid system for symmetric and asymmetric coupling between silver cut-wire
pairs and silicon grating waveguide with periodic grooves. The results show
that both couplings can induce electromagnetically-induced transparency (EIT)
analogous to the q... | 1011.4360v1 |
2010-11-29 | Synchronous bursts on scale-free neuronal networks with attractive and repulsive coupling | This paper investigates the dependence of synchronization transitions of
bursting oscillations on the information transmission delay over scale-free
neuronal networks with attractive and repulsive coupling. It is shown that for
both types of coupling, the delay always plays a subtle role in either
promoting or impairin... | 1011.6347v1 |
2010-11-29 | Interedge magnetic coupling in transition-metal terminated graphene nanoribbons | The magnetic structures and interedge magnetic couplings of Fe, Co and Ni
transition-metal terminated graphene nanoribbons with zigzag (ZGNR) and
armchair (AGNR) edges are studied by first-principles calculations. Fe-ZGNR is
found to show antiferromagnetic (AF) coupling between two edges, while the
interedge coupling o... | 1011.6356v1 |
2010-12-07 | The strong-coupling master equation of quantum open systems | In this paper we demonstrate how to generate the strong-coupling master
equations for open quantum systems of continuous variables. These are the
dissipative master equations of quantum Brownian particles for which the
environmental noise is stronger than other system forces. Our strong-coupling
master equations are ve... | 1012.1392v1 |
2010-12-14 | Intercellular synchronization of diffusively coupled astrocytes | We examine the synchrony of the dynamics of localized [Ca^{2+}]_i
oscillations in internal pool of astrocytes via diffusing coupling of a network
of such cells in a certain topology where cytosolic Ca^{2+} and inositol
1,4,5-triphosphate (IP3) are coupling molecules; and possible long range
interaction among the cells.... | 1012.3354v1 |
2010-12-25 | A conservative coupling algorithm between a compressible flow and a rigid body using an Embedded Boundary method | This paper deals with a new solid-fluid coupling algorithm between a rigid
body and an unsteady compressible fluid flow, using an Embedded Boundary
method. The coupling with a rigid body is a first step towards the coupling
with a Discrete Element method. The flow is computed using a Finite Volume
approach on a Cartesi... | 1012.5479v2 |
2011-01-16 | Ratio of bulk to shear viscosity in a quasigluon plasma: from weak to strong coupling | The ratio of bulk to shear viscosity is expected to exhibit a different
behaviour in weakly and in strongly coupled systems. This can be expressed by
its dependence on the squared sound velocity. In the high temperature QCD
plasma at small running coupling, the viscosity ratio is uniquely determined by
a quadratic depe... | 1101.3072v2 |
2011-01-27 | Superradiance of cold atoms coupled to a superconducting circuit | We investigate superradiance of an ensemble of atoms coupled to an integrated
superconducting LC-circuit. Particular attention is paid to the effect of
inhomogeneous coupling constants. Combining perturbation theory in the
inhomogeneity and numerical simulations we show that inhomogeneous coupling
constants can signifi... | 1101.5300v1 |
2011-01-27 | General mechanism for amplitude death in coupled systems | We introduce a general mechanism for amplitude death in coupled
synchronizable dynamical systems. It is known that when two systems are coupled
directly, they can synchronize under suitable conditions. When an indirect
feedback coupling through an environment or an external system is introduced in
them, it is found to ... | 1101.5340v2 |
2011-02-11 | Monolithic whispering-gallery mode resonators with vertically coupled integrated bus waveguides | We report on the realization and optical characterization of a
CMOS-compatible silicon-based microresonator/waveguide coupled system, fully
integrated on a silicon chip. The device uses a vertical coupling scheme
between the resonator and a buried strip waveguide. We demonstrate that its
high optical quality follows fr... | 1102.2370v1 |
2011-02-22 | Spin gap of the three-leg S=3/2 Heisenberg tube | The ground-state properties of the three-leg S=3/2 Heisenberg tube are
studied using the density-matrix renormalization group method. We find that the
spin-excitation gap associated with a spontaneous dimerization opens for the
whole coupling regime, as seen in the three-leg S=1/2 Heisenberg tube. However,
in contrast ... | 1102.4559v1 |
2011-02-25 | Low-temperature tapered-fiber probing of diamond NV ensembles coupled to GaP microcavities | In this work we present a platform for testing the device performance of a
cavity-emitter system, using an ensemble of emitters and a tapered optical
fiber. This method provides high-contrast spectra of the cavity modes,
selective detection of emitters coupled to the cavity, and an estimate of the
device performance in... | 1102.5372v1 |
2011-03-05 | Three-dimensional quantum phase diagram of the exact ground states of a mixture of two species of spin-1 Bose gases with interspecies spin exchange | We find nearly all the exact ground states of a mixture of two species of
spin-1 atoms with both interspecies and intraspecies spin exchanges in absence
of a magnetic field. The quantum phase diagram in the three-dimensional
parameter space and its two-dimensional cross sections are described. The
boundaries where the ... | 1103.1023v1 |
2011-03-09 | Coupling ultracold atoms to mechanical oscillators | In this article we discuss and compare different ways to engineer an
interface between ultracold atoms and micro- and nanomechanical oscillators. We
start by analyzing a direct mechanical coupling of a single atom or ion to a
mechanical oscillator and show that the very different masses of the two
systems place a limit... | 1103.1820v1 |
2011-03-10 | Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials | We compare topological insulator materials and Rashba coupled surfaces as
candidates for engineering p+ip superconductivity. Specifically, in each type
of material we examine 1) the limitations to inducing superconductivity by
proximity to an ordinary s-wave superconductor, and 2) the robustness of the
resulting superc... | 1103.2129v2 |
2011-03-16 | S-duality of D-brane action at order $O(α'^2)$ | Using the compatibility of the DBI and the Chern-Simons actions with the
T-duality transformations, the curvature corrections to these actions have been
recently extended to include the quadratic B-field couplings at order
$O(\alpha'^2)$. In this paper, we use the compatibility of the couplings on
D$_3$-brane with the ... | 1103.3121v5 |
2011-04-03 | Aharonov-Bohm-Coulomb Problem in Graphene Ring | We study the Aharonov-Bohm-Coulomb problem in a graphene ring. We
investigate, in particular, the effects of a Coulomb type potential of the form
$\xi/r$ on the energy spectrum of Dirac electrons in the graphene ring in two
different ways: one for the scalar coupling and the other for the vector
coupling. It is found t... | 1104.0369v2 |
2011-05-27 | Top quark tensor couplings | We compute the real and imaginary parts of the one-loop electroweak
contributions to the left and right tensorial anomalous couplings of the $tbW$
vertex in the Standard Model (SM). For both tensorial couplings we find that
the real part of the electroweak SM correction is close to 10$%$ of the leading
contribution giv... | 1105.5601v1 |
2011-06-09 | Hermitian Flavor Violation | The fundamental constraint on two Higgs doublet models comes from the
requirement of sufficiently suppressing flavor-changing neutral currents. There
are various standard approaches for dealing with this problem, but they all
tend to share a common feature; all of the Higgs doublets couple very weakly to
the first gene... | 1106.1734v1 |
2011-06-13 | Quantum superposition of a single microwave photon in two different "colour" states | The ability to coherently couple arbitrary harmonic oscillators in a
fully-controlled way is an important tool to process quantum information.
Coupling between quantum harmonic oscillators has previously been demonstrated
in several physical systems by use of a two-level system as a mediating
element. Direct interactio... | 1106.2523v1 |
2011-06-23 | Dynamics of a magnetic dimer with exchange, dipolar and Dzyalozhinski-Moriya interaction | We investigate the dynamics of a magnetic system consisting of two magnetic
moments coupled by either exchange, dipole-dipole, or Dzyalozhinski-Moriya
interaction. We compare the switching mechanisms and switching rates as induced
by the three couplings. For each coupling and each configuration of the two
anisotropy ax... | 1106.4713v2 |
2011-07-13 | Probing anomalous tbW couplings in single-top production using top polarization at the Large Hadron Collider | We study the sensitivity of the Large Hadron Collider (LHC) to anomalous tbW
couplings in single-top production in association with a W^- boson followed by
semileptonic decay of the top. We calculate top polarization and the effects of
these anomalous couplings to it at two centre-of-mass (cm) energies of 7 TeV
and 14 ... | 1107.2597v1 |
2011-08-08 | Coupling Bright and Dark Plasmonic Lattice Resonances | We demonstrate the coupling of bright and dark Surface Lattice Resonances
(SLRs), which are collective Fano resonances in 2D plasmonic crystals. As a
result of this coupling, a frequency stop-gap in the dispersion relation of
SLRs is observed. The different field symmetries of the low and high frequency
SLR bands lead ... | 1108.1620v1 |
2011-08-15 | Consistent Energy-based Atomistic/Continuum Coupling for Two-body Potentials in Three Dimensions | Very few works exist to date on development of a consistent energy-based
coupling of atomistic and continuum models of materials in more than one
dimension. The difficulty in constructing such a coupling consists in defining
a coupled energy whose minimizers are free from uncontrollable errors on the
atomistic/continuu... | 1108.2991v2 |
2011-08-26 | Dipole coupling of a double quantum dot to a microwave resonator | Quantum coherence in solid-state systems has been demonstrated in
superconducting circuits and in semiconductor quantum dots. This has paved the
way to investigate solid-state systems for quantum information processing with
the potential benefit of scalability compared to other systems based on atoms,
ions and photons.... | 1108.5378v1 |
2011-08-30 | Quantum Equivalence Principle Violations in Scalar-Tensor Theories | We study the equivalence principle and its violations by quantum effects in
scalar-tensor theories that admit a conformal frame in which matter only
couples to the spacetime metric. These theories possess Ward identities that
guarantee the validity of the weak equivalence principle to all orders in the
matter coupling ... | 1108.6028v1 |
2011-09-05 | Arrays of waveguide-coupled optical cavities that interact strongly with atoms | We describe a realistic scheme for coupling atoms or other quantum emitters
with an array of coupled optical cavities. We consider open Fabry-Perot
microcavities coupled to the emitters. Our central innovation is to connect the
microcavities to waveguide resonators, which are in turn evanescently coupled
to each other ... | 1109.0886v1 |
2011-09-13 | Interplay between non equilibrium and equilibrium spin torque using synthetic ferrimagnets | We discuss the current induced magnetization dynamics of spin valves F0|N|SyF
where the free layer is a synthetic ferrimagnet SyF made of two ferromagnetic
layers F1 and F2 coupled by RKKY exchange coupling. In the interesting
situation where the magnetic moment of the outer layer F2 dominates the
magnetization of the ... | 1109.2705v2 |
2011-09-22 | Ground-state phases of ultracold bosons with Rashba-Dresselhaus spin-orbit coupling | We study ultracold bosons in three dimensions with an anisotropic
Rashba-Dresselhaus spin-orbit coupling. We first carry out the exact summation
of ladder diagrams for the two-boson t-matrix at zero energy. Then, with the
t-matrix as the effective interaction, we find the ground-state phase diagrams
of bosons in mean f... | 1109.4954v2 |
2011-09-26 | Engineering Dresselhaus spin-orbit coupling for cold atoms in a double tripod configuration | We study laser induced spin-orbit (SO) coupling in cold atom systems where
lasers couple three internal states to a pair of excited states, in a double
tripod topology. Proper choice of laser amplitudes and phases produces a
Hamiltonian with a doubly degenerate ground state separated from the remaining
"excited" eigens... | 1109.5481v1 |
2011-10-14 | A BCS-BEC crossover in the extended Falicov-Kimball model: Variational cluster approach | We study the spontaneous symmetry breaking of the excitonic insulator state
induced by the Coulomb interaction $U$ in the two-dimensional extended
Falicov-Kimball model. Using the variational cluster approximation (VCA) and
Hartree-Fock approximation (HFA), we evaluate the order parameter,
single-particle excitation ga... | 1110.3150v1 |
2011-12-05 | Mixed partial-wave scattering with spin-orbit coupling and validity of pseudo-potentials | We present exact solutions of two-body problem for spin-1/2 fermions with
isotropic spin-orbit(SO) coupling and interacting with an arbitrary short-range
potential. We find that in each partial-wave scattering channel, the
parametrization of two-body wavefunction at short inter-particle distance
depends on the scatteri... | 1112.1122v2 |
2011-12-19 | Counterflow of spontaneous mass currents in trapped spin-orbit coupled Fermi gases | We use the Bogoliubov-de Gennes formalism and study the ground-state phases
of trapped spin-orbit coupled Fermi gases in two dimensions. Our main finding
is that the presence of a symmetric (Rashba type) spin-orbit coupling
spontaneously induces counterflowing mass currents in the vicinity of the trap
edge, i.e. $\upar... | 1112.4468v2 |
2011-12-23 | Threshold Saturation in Spatially Coupled Constraint Satisfaction Problems | We consider chains of random constraint satisfaction models that are
spatially coupled across a finite window along the chain direction. We
investigate their phase diagram at zero temperature using the survey
propagation formalism and the interpolation method. We prove that the SAT-UNSAT
phase transition threshold of a... | 1112.6320v2 |
2012-02-07 | BCS-BEC crossover in three-dimensional Fermi gases with spherical spin-orbit coupling | We present a systematic theoretical study of the BCS-BEC crossover problem in
three-dimensional atomic Fermi gases at zero temperature with a spherical
spin-orbit coupling which can be generated by a synthetic non-Abelian gauge
field coupled to neutral fermions. Our investigations are based on the path
integral formali... | 1202.1492v3 |
2012-02-12 | About possibility of strong coupling between single molecule and surface plasmons | The possibility of strong coupling between a single molecule and surface
plasmons is analyzed on the basis of a microscopic classical description. It is
predicted that strong single molecule - plasmon coupling can happen for a
silver nanoparticle only in the UV range where the real part of the dielectric
function of si... | 1202.2535v1 |
2012-03-12 | Bose-Einstein Condensates in Spin-Orbit Coupled Optical Lattices: Flat Bands and Superfluidity | Recently spin-orbit (SO) coupled superfluids in free space or harmonic traps
have been extensively studied, motivated by the recent experimental realization
of SO coupling for Bose-Einstein condensates (BEC). However, the rich physics
of SO coupled BEC in optical lattices has been largely unexplored. In this
paper, we ... | 1203.2389v2 |
2012-03-13 | Impact of Dresselhaus vs. Rashba spin-orbit coupling on the Holstein polaron | We utilize an exact variational numerical procedure to calculate the ground
state properties of a polaron in the presence of Rashba and linear Dresselhaus
spin-orbit coupling. We find that when the linear Dresselhaus spin-orbit
coupling approaches the Rashba spin-orbit coupling, the Van-Hove singularity in
the density ... | 1203.2795v1 |
2012-03-20 | Doubly and triply coupled nanowire antennas | Nanoantenna is one of the most important optical components for light
harvesting. In this study, we show experimental evidence of interactions
between coupled nanowires by comparing the fluorescence properties of quantum
dots on both non-coupled (single) and coupled (double and triple) nanowire
arrays. The fluorescence... | 1203.4357v1 |
2012-03-20 | Competing Nematic, Anti-ferromagnetic and Spin-flux orders in the Ground State of Bilayer Graphene | We analyze the phase diagram of the Bilayer graphene (BLG) at zero
temperature and doping. Assuming that at the high energies the electronic
system of BLG can be described within a weak coupling theory (consistent with
the experimental evidence), we systematically study the evolution of the
couplings with going from hi... | 1203.4608v1 |
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