publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2023-06-26 | Multiscale insight into the Cd1-xZnxTe vibrational-mechanical properties -- High-pressure experiments and ab initio calculations | The Cd1-xZnxTe semiconductor alloy is a regular system regarding its
macroscopic mechanic properties in that its experimental bulk modulus exhibits
a linear x-dependence, in line with ab initio predictions. Complexity arises at
the bond scale, referring to the intricate Cd1-xZnxTe percolation-type Raman
pattern [T. Alh... | 2306.14539v1 |
2024-04-09 | Low-Loss Silicon Directional Coupler with Arbitrary Coupling Ratios for Broadband Wavelength Operation Based on Bent Waveguides | We demonstrate a design for a high-performance $2 \times 2$ splitter meeting
the essential requirements of broadband coupling, support for arbitrary
coupling ratio, ultra low-loss, high fabrication tolerance, and a compact
footprint.
This is achieved based on a rigorous coupled mode theory analysis of the
broadband r... | 2404.06117v1 |
2002-02-01 | Nonlinear Couplings Between r-modes of Rotating Neutron Stars | The r-modes of neutron stars can be driven unstable by gravitational
radiation. While linear perturbation theory predicts the existence of this
instability, linear theory can't provide any information about the nonlinear
development of the instability. The subject of this paper is the weakly
nonlinear regime of fluid d... | 0202051v1 |
2004-08-19 | Can WIMP Spin Dependent Couplings explain DAMA data, in light of Null Results from Other Experiments? | We examine whether the annual modulation found by the DAMA dark matter
experiment can be explained by Weakly Interacting Massive Particles (WIMPs), in
light of new null results from other experiments. CDMS II has already ruled out
most WIMP-nucleus spin-independent couplings as an explanation for DAMA data.
Hence we he... | 0408346v3 |
2007-02-23 | Protoplanetary Disk Turbulence Driven by the Streaming Instability: Non-Linear Saturation and Particle Concentration | We present simulations of the non-linear evolution of streaming instabilities
in protoplanetary disks. The two components of the disk, gas treated with grid
hydrodynamics and solids treated as superparticles, are mutually coupled by
drag forces. We find that the initially laminar equilibrium flow spontaneously
develops... | 0702626v1 |
1998-05-19 | Range dependence of interlayer exchange coupling | We have considered the effects of non magnetic impurities and interface
roughness on the interlayer coupling between magnetic layers in metallic
multilayers. The two types of defects alter the interlayer coupling in quite
different ways. Elastic electron scattering by impurities in the non magnetic
spacer layers betwee... | 9805226v2 |
1999-02-09 | Magnetic Properties of Zig-Zag Ladders | We analyze the phase diagram of a system of spin-1/2 Heisenberg
antiferromagnetic chains interacting through a zig-zag coupling, also called
zig-zag ladders. Using bosonization techniques we study how a spin-gap or more
generally plateaux in magnetization curves arise in different situations. While
for coupled XXZ chai... | 9902112v2 |
1999-07-06 | Model glasses coupled to two different heat baths | In a $p$-spin interaction spherical spin-glass model both the spins and the
couplings are allowed to change in the course of time. The spins are coupled to
a heat bath with temperature $T$, while the coupling constants are coupled to a
bath having temperature $T_{J}$. In an adiabatic limit (where relaxation time
of the... | 9907090v1 |
2001-10-23 | Coupled CDW and SDW Fluctuations as an Origin of Anomalous Properties of Ferromagnetic Superconductor UGe_2 | It is shown that anomalous properties of UGe_2 can be understood in a unified
way on the basis of a single assumption that the superconductivity is mediated
by the coupled SDW and CDW fluctuations induced by the imperfect nesting of the
Fermi surface with majority spins at T=T_x(P) deep in the ferromagnetic phase.
Exce... | 0110492v3 |
2002-12-16 | Decoherence and gate performance of coupled solid state qubits | Solid state quantum bits are promising candidates for the realization of a
{\em scalable} quantum computer. However, they are usually strongly limited by
decoherence due to the many extra degrees of freedom of a solid state system.
We investigate a system of two solid state qubits that are coupled via
$\sigma_z^{(i)} \... | 0212374v1 |
2003-05-14 | Evolution from BCS superconductivity to Bose-Einstein condensation: Current correlation function in the broken-symmetry phase | We consider the current correlation function for a three-dimensional system
of fermions embedded in a homogeneous background and mutually interacting via
an attractive short-range potential, below the (superconducting) critical
temperature. Diagrammatic contributions in the broken-symmetry phase are
identified, that yi... | 0305324v1 |
2003-05-28 | Note on the thermodynamic Bethe Ansatz approach to the quantum phase diagram of the strong coupling ladder compounds | We investigate the low-temperature phase diagram of the exactly solved su(4)
two-leg spin ladder as a function of the rung coupling $J_{\perp}$ and magnetic
field $H$ by means of the thermodynamic Bethe Ansatz (TBA). In the absence of a
magnetic field the model exhibits three quantum phases, while in the presence
of a ... | 0305633v1 |
2004-04-29 | Strong Coupling Theory for Interacting Lattice Models | We develop a strong coupling approach for a general lattice problem. We argue
that this strong coupling perspective represents the natural framework for a
generalization of the dynamical mean field theory (DMFT). The main result of
this analysis is twofold: 1) It provides the tools for a unified treatment of
any non-lo... | 0404722v2 |
2005-08-03 | Relaxation in a glassy binary mixture: Comparison of the mode-coupling theory to a Brownian dynamics simulation | We solved the mode-coupling equations for the Kob-Andersen binary mixture
using the structure factors calculated from Brownian dynamics simulations of
the same system. We found, as was previously observed, that the mode-coupling
temperature, Tc, inferred from simulations is about two times greater than that
predicted b... | 0508102v1 |
2005-12-23 | Mode Coupling in Quantized High Quality Films | The effect of coupling of quantized modes on transport and localization in
ultrathin films with quantum size effect (QSE) is discussed. The emphasis is on
comparison of films with Gaussian, exponential, and power-law long-range
behavior of the correlation function of surface, thickness, or bulk
fluctuations. For small-... | 0512614v1 |
2006-02-09 | Spectral Properties of Holstein and Breathing Polarons | We calculate the spectral properties of the one-dimensional Holstein and
breathing polarons using the self-consistent Born approximation. The Holstein
model electron-phonon coupling is momentum independent while the breathing
coupling increases monotonically with the phonon momentum. We find that for a
linear or tight ... | 0602249v1 |
2006-04-07 | Interchain coupling effects on photoinduced phase transitions between neutral and ionic phases in an extended Hubbard model with alternating potentials and an electron-lattice coupling | Dynamics of ionic-to-neutral and neutral-to-ionic phase transitions induced
by intrachain charge-transfer photoexcitations are studied in a
quasi-one-dimensional extended Hubbard model with alternating potentials and an
electron-lattice coupling for mixed-stack charge-transfer complexes. For
interchain couplings, we us... | 0604196v1 |
2006-10-15 | Bosonization and density-matrix renormalization group studies of Fulde-Ferrell-Larkin-Ovchinnikov phase and irrational magnetization plateaus in coupled chains | We review the properties of two coupled fermionic chains, or ladders, under a
magnetic field parallel to the lattice plane. Results are computed by
complementary analytical (bosonization) and numerical (density-matrix
renormalization group) methods which allows a systematic comparison. Limiting
cases such as coupled ba... | 0610397v3 |
2007-02-07 | Crossover behavior and multi-step relaxation in a schematic model of the cut-off glass transition | We study a schematic mode-coupling model in which the ideal glass transition
is cut off by a decay of the quadratic coupling constant in the memory
function. (Such a decay, on a time scale tau_I, has been suggested as the
likely consequence of activated processes.) If this decay is complete, so that
only a linear coupl... | 0702170v1 |
2004-07-28 | Coupling of radial and non-radial oscillations of relativistic stars: gauge-invariant formalism | Linear perturbation theory is appropriate to describe small oscillations of
stars, while a mild non-linearity is still tractable perturbatively but
requires to consider mode coupling. It is natural to start to look at this
problem by considering the coupling between linear radial and non-radial modes.
Radial pulsations... | 0407108v2 |
1992-04-08 | Monte Carlo Simulations of Higgs-Fermion Systems | To gain understanding of the Higgs-fermion sector of the standard model, we
study the one-component $Z_2$ symmetric and the four-component O(4) symmetric
scalar models coupled to staggered fermions using the hybrid Monte Carlo
algorithm. We map out the phase diagrams, and show that the $Z_2$ model has a
tree level pert... | 9201001v1 |
2004-10-25 | Confinement in the lattice Landau Gauge QCD simulation | The running coupling and the Kugo-Ojima parameter of the confinement
criterion are measured for the quenched SU(3) \beta=6.4, 6.45, 56^4 lattice and
the unquenched \beta=5.2, 20^3 x 48 lattice of JLQCD, \beta=2.1, \kappa=0.1357,
0.1382, 24^3 x 48 lattice of CP-PACS and \beta_{imp}=6.76,a m_{u,d}=0.007,
6.83,a m_{u,d}=0... | 0410038v3 |
1993-09-15 | A Comprehensive Study of Leptoquark Bounds | We make a comprehensive study of indirect bounds on scalar leptoquarks that
couple chirally and diagonally to the first generation by examining available
data from low energy experiments as well as from high energy e+ e- and p pbar
accelerators. The strongest bounds turn out to arise from low energy data: For
leptoquar... | 9309266v3 |
1995-12-30 | R(b), R(c) and New Physics: An Updated Model Independent Analysis | We analyze LEP and SLC data from the 1995 Summer Conferences as well as from
low energy neutral current experiments for signals of new physics. The reasons
for doing this are twofold, first to explain the deviations from the standard
model observed in $R_b$ and $R_c$ and second to constrain non-standard
contributions t... | 9512445v3 |
1998-11-20 | Are there anomalous Z fermion couplings ? | The couplings of the fermions to the Z boson are of great importance in
establishing the validity of the Standard Model and in looking for physics
beyond it.
The couplings of the b-quark to the Z boson have been the subject of much
experimental study and theoretical interpretation. The apparent excess in the
value of... | 9811415v2 |
2001-03-14 | Analysis of Couplings with Large Tensor Representations in SO(2N) and Proton Decay | We develop techniques for the analysis of SO(2N) invariant couplings which
allow a full exhibition of the SU(N) invariant content of the spinor and tensor
representations. The technique utilizes a basis consisting of a specific set of
reducible SU(N) tensors in terms of which the SO(2N) invariant couplings have a
simpl... | 0103165v3 |
2004-10-29 | The massive analytic invariant charge in QCD | The low energy behavior of a recently proposed model for the massive analytic
running coupling of QCD is studied. This running coupling has no unphysical
singularities, and in the absence of masses displays infrared enhancement. The
inclusion of the effects due to the mass of the lightest hadron is accomplished
by empl... | 0410406v1 |
2005-08-14 | Couplings in SO(10) Grand Unification | In this thesis, we develop techniques for the analysis of SO(2N) invariant
couplings which allows a full exhibition of the SU(N) invariant content of the
spinor and tensor representations. The techniques utilize a so called Basic
Theorem which we first derive. Using this method an evaluation of the trilinear
couplings ... | 0508153v1 |
2006-11-30 | Hard thermal loops and the entropy of supersymmetric Yang-Mills theories | We apply the previously proposed scheme of approximately self-consistent
hard-thermal-loop resummations in the entropy of high-temperature QCD to N=4
supersymmetric Yang-Mills (SYM) theories and compare with a (uniquely
determined) R[4,4] Pad\'e approximant that interpolates accurately between the
known perturbative re... | 0611393v2 |
1994-02-01 | Field Dependent Gauge Couplings in Locally Supersymmetric Effective Quantum Field Theories | We investigate the field dependence of the gauge couplings of locally
supersymmetric effective quantum field theories. We find that the Weyl
rescaling of supergravity gives rise to Wess-Zumino terms that affect the gauge
couplings at the one-loop level. These Wess-Zumino terms are crucial in
assuring supersymmetric con... | 9402005v2 |
1998-12-10 | Asymptotic Freedom and Infrared Behavior in the Type 0 String Approach to Gauge Theory | In a recent paper we considered the type 0 string theories, obtained from the
ten-dimensional closed NSR string by a GSO projection which excludes space-time
fermions, and studied the low-energy dynamics of N coincident D-branes. This
led us to conjecture that the four-dimensional SU(N) gauge theory coupled to 6
adjoin... | 9812089v4 |
2006-01-29 | Phase transition in matrix model with logarithmic action: Toy-model for gluons in baryons | We study the competing effects of gluon self-coupling and their interactions
with quarks in a baryon, using the very simple setting of a hermitian 1-matrix
model with action tr A^4 - log det(nu + A^2). The logarithmic term comes from
integrating out N quarks. The model is a caricature of 2d QCD coupled to
adjoint scala... | 0601216v1 |
2006-08-25 | String-inspired cosmology: Late time transition from scaling matter era to dark energy universe caused by a Gauss-Bonnet coupling | The Gauss-Bonnet (GB) curvature invariant coupled to a scalar field $\phi$
can lead to an exit from a scaling matter-dominated epoch to a late-time
accelerated expansion, which is attractive to alleviate the coincident problem
of dark energy. We derive the condition for the existence of cosmological
scaling solutions i... | 0608178v2 |
2004-10-15 | Nonlinear theory of dust lattice mode coupling in dust crystals | Quasi-crystals formed by charged mesoscopic dust grains (dust lattices),
observed since hardly a decade ago, are an exciting paradigm of a nonlinear
chain. In laboratory discharge experiments, these quasi-lattices are formed
spontaneously in the sheath region near a negative electrode, usually at a
levitated horizontal... | 0410098v1 |
2006-10-05 | Quantum nature of a strongly-coupled single quantum dot-cavity system | Cavity quantum electrodynamics (QED) studies the interaction between a
quantum emitter and a single radiation-field mode. When an atom is in strong
coupling with a cavity mode1,2, it is possible to realize key quantum
information processing (QIP) tasks, such as controlled coherent coupling and
entanglement of distingui... | 0610034v1 |
2007-04-19 | Very weak electron-phonon coupling and strong strain coupling in manganites | The coupling of the manganite stripe phase to the lattice and to strain has
been investigated via transmission electron microscopy studies of
polycrystalline and thin film manganites. In polycrystalline \PCMOfiftwo a
lockin to $q/a^*=0.5$ in a sample with $x>0.5$ has been observed for the first
time. Such a lockin has ... | 0704.2598v3 |
2007-07-13 | The Schroedinger functional for Gross-Neveu models | Gross-Neveu type models with a finite number of fermion flavours are studied
on a two-dimensional Euclidean space-time lattice. The models are
asymptotically free and are invariant under a chiral symmetry. These
similarities to QCD make them perfect benchmark systems for fermion actions
used in large scale lattice QCD ... | 0707.1939v1 |
2007-09-13 | Rapid roll Inflation with Conformal Coupling | Usual inflation is realized with a slow rolling scalar field minimally
coupled to gravity. In contrast, we consider dynamics of a scalar with a flat
effective potential, conformally coupled to gravity. Surprisingly, it contains
an attractor inflationary solution with the rapidly rolling inflaton field. We
discuss model... | 0709.1952v2 |
2007-10-26 | Nonminimal isotropic cosmological model with Yang-Mills and Higgs fields | We establish a nonminimal Einstein-Yang-Mills-Higgs model, which contains six
coupling parameters. First three parameters relate to the nonminimal coupling
of non-Abelian gauge field and gravity field, two parameters describe the
so-called derivative nonminimal coupling of scalar multiplet with gravity
field, and the s... | 0710.4992v2 |
2007-12-30 | Depinning in a two-layer model of plastic flow | We study a model of two layers, each consisting of a d-dimensional elastic
object driven over a random substrate, and mutually interacting through a
viscous coupling. For this model, the mean-field theory (i.e. a fully connected
model) predicts a transition from elastic depinning to hysteretic plastic
depinning as diso... | 0801.0137v1 |
2008-03-27 | Single top quark production at LHC with anomalous Wtb couplings | We investigate single top production in the presence of anomalous Wtb
couplings. We explicitly show that, if these couplings arise from gauge
invariant effective operators, the only relevant couplings for single top
production and decay are the usual gamma^mu and sigma^mu nu q_nu terms, where q
is the W boson momentum.... | 0803.3810v3 |
2008-05-19 | On The Uniqueness of Minimal Coupling in Higher-Spin Gauge Theory | We address the uniqueness of the minimal couplings between higher-spin fields
and gravity. These couplings are cubic vertices built from gauge non-invariant
connections that induce non-abelian deformations of the gauge algebra. We show
that Fradkin-Vasiliev's cubic 2-s-s vertex, which contains up to 2s-2
derivatives dr... | 0805.2764v2 |
2008-06-22 | Coherence Transition of Small Josephson Junctions Coupled to a Single-Mode Resonant Cavity: Connection to the Dicke Model | We calculate the thermodynamic properties of a collection of $N$ small
Josephson junctions coupled to a single-mode resonant electromagnetic cavity,
at finite temperature $T$, using several approaches. In the first approach, we
include all the quantum-mechanical levels of the junction, but treat the
junction-cavity int... | 0806.3550v1 |
2008-08-21 | A New Method of Calculating the Running Coupling Constant | We propose a new method to compute the running coupling constant of gauge
theories on the lattice. We first give the definition of the running coupling
in the new scheme using the Wilson loops in a finite volume, and explain how
the running of the coupling constant is extracted from the measurement of the
volume depend... | 0808.2875v2 |
2008-09-01 | Strongly Coupled Radiation from Moving Mirrors and Holography in the Karch-Randall model | Motivated by the puzzles in understanding how Black Holes evaporate into a
strongly coupled Conformal Field Theory, we study particle creation by an
accelerating mirror. We model the mirror as a gravitating Domain Wall and
consider a CFT coupled to it through gravity, in asymptotically Anti de Sitter
space. This proble... | 0809.0005v2 |
2008-11-20 | Entangled photons from a strongly coupled quantum dot-cavity system | A quantum dot strongly coupled to a photonic crystal has been recently
proposed as a source of entangled photon pairs [R. Johne et al., Phys. Rev.
Lett. 100, 240404 (2008)]. The biexction decay via intermediate polariton
states can be used to overcome the natural splitting between the exciton states
coupled to the hori... | 0811.3329v1 |
2008-12-08 | Supercurrent coupling in the Faddeev-Skyrme model | Motivated by the sigma model limit of multicomponent Ginzburg-Landau theory,
a version of the Faddeev-Skyrme model is considered in which the scalar field
is coupled dynamically to a one-form field called the supercurrent. This
coupled model is investigated in the general setting where physical space is an
oriented Rie... | 0812.1493v1 |
2008-12-16 | Gate Coupling to Nanoscale Electronics | The realization of single-molecule electronic devices, in which a
nanometer-scale molecule is connected to macroscopic leads, requires the
reproducible production of highly ordered nanoscale gaps in which a molecule of
interest is electrostatically coupled to nearby gate electrodes. Understanding
how the molecule-gate ... | 0812.3177v2 |
2009-05-19 | Laser oscillation in a strongly coupled single quantum dot-nanocavity system | Strong coupling of photons and materials in semiconductor nanocavity systems
has been investigated because of its potentials in quantum information
processing and related applications, and has been testbeds for cavity quantum
electrodynamics (QED). Interesting phenomena such as coherent exchange of a
single quantum bet... | 0905.3063v2 |
2009-11-11 | Kondo screening in high-spin side-coupled two-impurity clusters | We study the system of two magnetic impurities described by a two-impurity
Kondo model where only the first impurity couples directly to the conduction
band, while the second impurity interacts with the first through Heisenberg
exchange coupling in a "side-coupled" configuration. We consider various
choices of the impu... | 0911.2148v1 |
2009-11-29 | Synchronization of coupled stochastic limit cycle oscillators | For a class of coupled limit cycle oscillators, we give a condition on a
linear coupling operator that is necessary and sufficient for exponential
stability of the synchronous solution. We show that with certain modifications
our method of analysis applies to networks with partial, time-dependent, and
nonlinear couplin... | 0911.5520v2 |
2010-01-05 | Quantum Monte-Carlo method applied to Non-Markovian barrier transmission | In nuclear fusion and fission, fluctuation and dissipation arise due to the
coupling of collective degrees of freedom with internal excitations. Close to
the barrier, both quantum, statistical and non-Markovian effects are expected
to be important. In this work, a new approach based on quantum Monte-Carlo
addressing th... | 1001.0652v1 |
2010-01-20 | Spin electric effects in molecular antiferromagnets | Molecular nanomagnets show clear signatures of coherent behavior and have a
wide variety of effective low-energy spin Hamiltonians suitable for encoding
qubits and implementing spin-based quantum information processing. At the
nanoscale, the preferred mechanism for control of quantum systems is through
application of e... | 1001.3584v1 |
2010-01-21 | Synchrotron radiation in strongly coupled conformal field theories | Using gauge/gravity duality, we compute the energy density and angular
distribution of the power radiated by a quark undergoing circular motion in
strongly coupled ${\cal N}=4$ supersymmetric Yang-Mills (SYM) theory. We
compare the strong coupling results to those at weak coupling, and find the
same angular distributio... | 1001.3880v4 |
2010-02-22 | Strong and Tunable Nonlinear Optomechanical Coupling in a Low-Loss System | A major goal in optomechanics is to observe and control quantum behavior in a
system consisting of a mechanical resonator coupled to an optical cavity. Work
towards this goal has focused on increasing the strength of the coupling
between the mechanical and optical degrees of freedom; however, the form of
this coupling ... | 1002.4158v1 |
2010-03-10 | Microwave driven arbitrary coupling between trapped charge resonances in a silicon single electron transistor | In quantum computation, information is processed by gates that must
coherently couple separate qubits. In many systems the qubits are naturally
coupled, but such an always-on interaction limits the algorithms that may be
implemented. Coupling interactions may also be directed in devices and circuits
that are provided w... | 1003.2112v1 |
2010-03-29 | Lessons from the decoupling limit of Horava gravity | We consider the so-called "healthy" extension of Horava gravity in the limit
where the Stuckelberg field decouples from the graviton. We verify the alleged
strong coupling problem in this limit, under the assumption that no large
dimensionless parameters are put in by hand. This follows from the fact that
the dispersio... | 1003.5666v2 |
2010-06-07 | A Parsing Scheme for Finding the Design Pattern and Reducing the Development Cost of Reusable Object Oriented Software | Because of the importance of object oriented methodologies, the research in
developing new measure for object oriented system development is getting
increased focus. The most of the metrics need to find the interactions between
the objects and modules for developing necessary metric and an influential
software measure ... | 1006.1182v1 |
2010-07-18 | Wormhole geometries supported by a nonminimal curvature-matter coupling | Wormhole geometries in curvature-matter coupled modified gravity are
explored, by considering an explicit nonminimal coupling between an arbitrary
function of the scalar curvature, R, and the Lagrangian density of matter. It
is the effective stress-energy tensor containing the coupling between matter
and the higher ord... | 1007.3040v2 |
2010-07-22 | Various equations for gap probabilities of coupled Gaussian matrices | Versions of Tracy-Widom (TW) and Adler-Shiota-van Moerbeke (ASvM) approaches
are applied to derive various partial differential equations (PDE) satisfied by
joint eigenvalue spacing probabilities of two coupled Gaussian Hermitian
matrices (coupled GUE). All the lowest (third) order PDE satisfied by the
probabilities fo... | 1007.3793v2 |
2010-07-25 | Quantum thermalization of two coupled two-level systems in eigenstate and bare-state representations | We study analytically the quantum thermalization of two coupled two-level
systems (TLSs), which are connected with either two independent heat baths
(IHBs) or a common heat bath (CHB). We understand the quantum thermalization in
eigenstate and bare-state representations when the coupling between the two
TLSs is stronge... | 1007.4296v2 |
2010-07-30 | Qubit-oscillator system: An analytical treatment of the ultra-strong coupling regime | We examine a two-level system coupled to a quantum oscillator, typically
representing experiments in cavity and circuit quantum electrodynamics. We show
how such a system can be treated analytically in the ultrastrong coupling
limit, where the ratio $g/\Omega$ between coupling strength and oscillator
frequency approach... | 1007.5437v3 |
2010-08-10 | A Parsing Scheme for Finding the Design Pattern and Reducing the Development Cost of Reusable Object Oriented Software | Because of the importance of object oriented methodologies, the research in
developing new measure for object oriented system development is getting
increased focus. The most of the metrics need to find the interactions between
the objects and modules for developing necessary metric and an influential
software measure ... | 1008.1671v1 |
2010-09-06 | Quantum dot Rabi rotations beyond the weak exciton-phonon coupling regime | We study the excitonic dynamics of a driven quantum dot under the influence
of a phonon environment, going beyond the weak exciton-phonon coupling
approximation. By combining the polaron transform and time-local projection
operator techniques we develop a master equation that can be valid over a much
larger range of ex... | 1009.1155v2 |
2010-10-28 | The Effect of Spatial Coupling on Compressive Sensing | Recently, it was observed that spatially-coupled LDPC code ensembles approach
the Shannon capacity for a class of binary-input memoryless symmetric (BMS)
channels. The fundamental reason for this was attributed to a "threshold
saturation" phenomena derived by Kudekar, Richardson and Urbanke. In
particular, it was shown... | 1010.6020v1 |
2010-11-20 | Instabilities in neutrino systems induced by interactions with scalars | If there are scalar particles of small or moderate mass coupled very weakly
to Dirac neutrinos, in a minimal way, then neutrino-anti-neutrino clouds of
sufficient number density can experience an instability in which helicities are
suddenly reversed. The predicted collective evolution is many orders of
magnitude faster... | 1011.4585v2 |
2010-12-22 | Counter-ions at Charged Walls: Two Dimensional Systems | We study equilibrium statistical mechanics of classical point counter-ions,
formulated on 2D Euclidean space with logarithmic Coulomb interactions
(infinite number of particles) or on the cylinder surface (finite particle
numbers), in the vicinity of a single uniformly charged line (one single
double-layer), or between... | 1012.4983v1 |
2011-01-13 | Efficiency for preforming molecules from mixtures of light Fermi and heavy Bose atoms in optical lattices: the strong-coupling-expansion method | We discuss the application of a strong-coupling expansion (perturbation
theory in the hopping) for studying light-Fermi-heavy-Bose (like
$^{40}$K-$^{87}$Rb) mixtures in optical lattices. We use the strong-coupling
method to evaluate the efficiency for pre-forming molecules, the entropy per
particle and the thermal fluc... | 1101.2666v1 |
2011-01-21 | A global hybrid coupled model based on Atmosphere-SST feedbacks | A global hybrid coupled model is developed, with the aim of studying the
effects of ocean-atmosphere feedbacks on the stability of the Atlantic
meridional overturning circulation. The model includes a global ocean general
circulation model and a statistical atmosphere model. The statistical
atmosphere model is based on... | 1101.4096v5 |
2011-02-17 | A spectral function tour of electron-phonon coupling outside the Migdal limit | We simulate spectral functions for electron-phonon coupling in a filled band
system - far from the asymptotic limit often assumed where the phonon energy is
very small compared to the Fermi energy in a parabolic band and the Migdal
theorem predicting 1+lambda quasiparticle renormalizations is valid. These
spectral func... | 1102.3716v2 |
2011-03-01 | Flavored Gauge-Mediation | The messengers of Gauge-Mediation Models can couple to standard-model matter
fields through renormalizable superpotential couplings. These matter-messenger
couplings generate generation-dependent sfermion masses and are therefore
usually forbidden by discrete symmetries. However, the non-trivial structure of
the standa... | 1103.0292v2 |
2011-03-14 | Strong and weak chaos in weakly nonintegrable many-body Hamiltonian systems | We study properties of chaos in generic one-dimensional nonlinear Hamiltonian
lattices comprised of weakly coupled nonlinear oscillators, by numerical
simulations of continuous-time systems and symplectic maps. For small coupling,
the measure of chaos is found to be proportional to the coupling strength and
lattice len... | 1103.2634v2 |
2011-05-13 | The geometry of spontaneous spiking in neuronal networks | The mathematical theory of pattern formation in electrically coupled networks
of excitable neurons forced by small noise is presented in this work. Using the
Freidlin-Wentzell large deviation theory for randomly perturbed dynamical
systems and the elements of the algebraic graph theory, we identify and analyze
the main... | 1105.2801v2 |
2011-07-24 | Optimized coupling of cold atoms into a fiber using a blue-detuned hollow-beam funnel | We theoretically investigate the process of coupling cold atoms into the core
of a hollow-core photonic-crystal optical fiber using a blue-detuned
Laguerre-Gaussian beam. In contrast to the use of a red-detuned Gaussian beam
to couple the atoms, the blue-detuned hollow-beam can confine cold atoms to the
darkest regions... | 1107.4746v1 |
2011-09-12 | The role of the indirect tunneling processes and asymmetry in couplings in orbital Kondo transport through double quantum dots | System of two quantum dots attached to external electrodes is considered
theoretically in orbital Kondo regime. In general, the double dot system is
coupled via both Coulomb interaction and direct hoping. Moreover, the indirect
hopping processes between the dots (through the leads) are also taken into
account. To inves... | 1109.2621v1 |
2011-10-27 | Couplings of light I=0 scalar mesons to simple operators in the complex plane | The flavour and glue structure of the light scalar mesons in QCD are probed
by studying the couplings of the I=0 mesons $\sigma(600)$ and $f_0(980)$ to the
operators $\bar{q}q$, $\alpha_s G^2$ and to two photons. The Roy dispersive
representation for the $\pi\pi$ amplitude $t_0^0(s)$ is used to determine the
pole posit... | 1110.6074v1 |
2011-10-27 | Disentangling multi-level systems: averaging, correlations and memory | We consider two weakly coupled systems and adopt a perturbative approach
based on the Ruelle response theory to study their interaction. We propose a
systematic way to parametrize the effect of the coupling as a function of only
the variables of a system of interest. Our focus is on describing the impacts
of the coupli... | 1110.6113v1 |
2012-07-06 | SU(3) Spin-Orbit Coupling in Systems of Ultracold Atoms | Motivated by the recent experimental success in realizing synthetic
spin-orbit coupling in ultracold atomic systems, we consider N-component atoms
coupled to a non-Abelian SU(N) gauge field. More specifically, we focus on the
case, referred to here as "SU(3) spin-orbit-coupling," where the internal
states of three-comp... | 1207.1728v2 |
2012-07-18 | Structural transitions in vertically and horizontally coupled parabolic channels of Wigner crystals | Structural phase transitions in two vertically or horizontally coupled
channels of strongly interacting particles are investigated. The particles are
free to move in the $x$-direction but are confined by a parabolic potential in
the $y$-direction. They interact with each other through a screened power-law
potential ($r... | 1207.4315v1 |
2012-10-26 | Surface superconductivity in rhombohedral graphite | We show that rhombohedral graphite may support surface superconductivity with
an unusual relation between the BCS coupling constant and the order parameter.
This feature results from the properties of the states localized on the
graphite surfaces. In a description including only the nearest neighbour
coupling of the gr... | 1210.7075v2 |
2013-01-11 | Gravitationally Coupled Dirac Equation for Antimatter | The coupling of antimatter to gravity is of general interest because of
conceivable cosmological consequences ("surprises") related to dark energy and
the cosmological constant. Here, we revisit the derivation of the
gravitationally coupled Dirac equation and find that the prefactor of a result
given previously in [D.R... | 1301.2442v4 |
2013-01-31 | Zero-lag synchronization in coupled time-delayed piecewise linear electronic circuits | We investigate and report an experimental confirmation of zero-lag
synchronization (ZLS) in a system of three coupled time-delayed piecewise
linear electronic circuits via dynamical relaying with different coupling
configurations, namely mutual and subsystem coupling configurations. We have
observed that when there is ... | 1301.7588v1 |
2013-02-26 | Bulk Stabilization, the Extra-Dimensional Higgs Portal and Missing Energy in Higgs Events | To solve the hierarchy problem, extra-dimensional models must explain why the
new dimensions stabilize to the right size, and the known mechanisms for doing
so require bulk scalars that couple to the branes. Because of these couplings
the energetics of dimensional stabilization competes with the energetics of the
Higgs... | 1302.6486v1 |
2013-03-28 | Synchronization of Weakly Coupled Oscillators: Coupling, Delay and Topology | There are three key factors of a system of coupled oscillators that
characterize the interaction among them: coupling (how to affect), delay (when
to affect) and topology (whom to affect). For each of them, the existing work
has mainly focused on special cases. With new angles and tools, this paper
makes progress in re... | 1303.7248v1 |
2013-04-22 | Displacement Convexity, A Useful Framework for the Study of Spatially Coupled Codes | Spatial coupling has recently emerged as a powerful paradigm to construct
graphical models that work well under low-complexity message-passing
algorithms. Although much progress has been made on the analysis of spatially
coupled models under message passing, there is still room for improvement, both
in terms of simplif... | 1304.6026v2 |
2013-05-14 | Planck constraints on single-field inflation | We place observational constraints on slow-variation single-field
inflationary models by carrying out the cosmological Monte Carlo simulation
with the recent data of Planck combined with the WMAP large-angle polarization,
baryon acoustic oscillations, and ACT/SPT temperature data. Our analysis covers
a wide variety of ... | 1305.3044v2 |
2013-05-27 | Energy Coupled Mode Theory for an arbitrary number of resonators | There is recent interest in the inter and intra element interactions of
metamaterial unit cells. To calculate the effects of these interactions which
can be substantial, an ab initio general coupled mode equation, in the form of
an eigenvalue problem, is derived. The solution of the master equation gives
the coupled fr... | 1305.6085v4 |
2013-05-29 | Epitaxial strain effects on magnetic ordering and spin-phonon couplings in the (SrMnO$_3$)$_1$/(LaMnO$_3$)$_1$ superlattice from first principles | We have studied the influence of epitaxial strain on magnetic orderings and
the couplings between the spin and polar phonons in the 1:1 SrMnO$_3$/LaMnO$_3$
superlattice from first principles. Magnetic phase transitions of the
superlattice induced by epitaxial strain are observed, consistent with previous
reports. We fi... | 1305.6943v1 |
2013-07-18 | Driven nonlinear dynamics of two coupled exchange-only qubits | Inspired by creation of a fast exchange-only qubit (Medford et al., Phys.
Rev. Lett., 111, 050501 (2013)), we develop a theory describing the nonlinear
dynamics of two such qubits that are capacitively coupled, when one of them is
driven resonantly at a frequency equal to its level splitting. We include
conditions of s... | 1307.5075v2 |
2013-10-17 | Tunable Quantum Phase Transitions in a Resonant Level Coupled to Two Dissipative Baths | We study tunneling through a resonant level connected to two dissipative
bosonic baths: one is the resistive environment of the source and drain leads,
while the second comes from coupling to potential fluctuations on a resistive
gate. We show that several quantum phase transitions (QPT) occur in such a
model, transiti... | 1310.4773v2 |
2013-10-22 | Large Hadron Collider constraints on a light baryon number violating sbottom coupling to a top and a light quark | We investigate a model of R-parity violating (RPV) supersymmetry in which the
right-handed sbottom is the lightest supersymmetric particle, and a baryon
number violating coupling involving a top is the only non-negligible RPV
coupling. This model evades proton decay and flavour constraints. We consider
in turn each of ... | 1310.6016v2 |
2013-10-24 | Microscopic approach to coupled-channels effects on fusion | Background: Near-barrier fusion can be strongly affected by the coupling
between relative motion and internal degrees of freedom of the collision
partners. The time-dependent Hartree-Fock (TDHF) theory and the
coupled-channels (CC) method are standard approaches to investigate this aspect
of fusion dynamics. However, b... | 1310.6500v2 |
2013-10-29 | Self-Quenching of Nuclear Spin Dynamics in Central Spin Problem | We consider, in the framework of the central spin $s=1/2$ model, driven
dynamics of two electrons in a double quantum dot subject to hyperfine
interaction with nuclear spins and spin-orbit coupling. The nuclear subsystem
dynamically evolves in response to Landau-Zener singlet-triplet transitions of
the electronic subsy... | 1310.7847v1 |
2014-01-15 | Monte Carlo Study of a wide range of Molecular Spintronics Devices | Molecular spintronics devices (MSDs) are highly promising candidates for
enabling quantum computation and revolutionizing computer logic and memory. An
advanced MSD will require the placement of magnetic molecules between the two
ferromagnetic (FM) electrodes. Recent experimental studies showed that some
magnetic molec... | 1401.3422v1 |
2014-01-28 | Insensitizing exact controls for the scalar wave equation and exact controllability of $2$-coupled cascade systems of PDE's by a single control | We study the exact controllability, by a reduced number of controls, of
coupled cascade systems of PDE's and the existence of exact insensitizing
controls for the scalar wave equation. We give a necessary and sufficient
condition for the observability of abstract coupled cascade hyperbolic systems
by a single observati... | 1401.7323v1 |
2014-02-05 | Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures | We investigate the proximity effect in diffusive superconducting hybrid
structures with a spin-orbit (SO) coupling. Our study is focused on the
singlet-triplet conversion and the generation of long-range superconducting
correlations in ferromagnetic elements. We derive the quasiclassical equations
for the Green's funct... | 1402.1025v3 |
2014-02-20 | Synchronization and phase ordering in globally coupled chaotic maps | We investigate the processes of synchronization and phase ordering in a
system of globally coupled maps possessing bistable, chaotic local dynamics.
The stability boundaries of the synchronized states are determined on the space
of parameters of the system. The collective properties of the system are
characterized by m... | 1402.4870v1 |
2014-04-02 | Stabilizing Electroweak Vacuum in a Vector-like Fermion Model | To avoid possible electroweak vacuum instability in the vector-like fermion
model, we introduce a new singlet scalar to the model, which couples to the
vector-like fermion, and also mixes with the Higgs boson after spontaneous
symmetry breaking. We investigate the vector-like fermion predominantly coupled
to the third ... | 1404.0681v2 |
2014-04-03 | Constraining couplings of the top quarks to the Z boson in ttbar+Z production at the LHC | We study top quark pair production in association with a Z boson at the Large
Hadron Collider (LHC) and investigate the prospects of measuring the couplings
of top quarks to the Z boson. To date these couplings have not been constrained
in direct measurements. Such a determination will be possible for the first
time at... | 1404.1005v2 |
2014-04-27 | Pinning dynamic systems of networks with Markovian switching couplings and controller-node set | In this paper, we study pinning control problem of coupled dynamical systems
with stochastically switching couplings and stochastically selected
controller-node set. Here, the coupling matrices and the controller-node sets
change with time, induced by a continuous-time Markovian chain. By constructing
Lyapunov function... | 1404.6793v1 |
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