publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2022-11-07 | Mirror-coupled plasmonic bound states in the continuum for tunable perfect absorption | Tailoring critical light-matter coupling is a fundamental challenge of
nanophotonics, impacting diverse fields from higher harmonic generation and
energy conversion to surface-enhanced spectroscopy. Plasmonic perfect absorbers
(PAs), where resonant antennas couple to their mirror images in adjacent metal
films, have be... | 2211.03673v1 |
2022-11-18 | Normalized solution to coupled nonhomogeneous nonlinear elliptic system with three wave interaction under unbounded potentials | In this paper, we use the variational method to find the normalized solutions
of the quadratic coupled three wave Schrodinger equation with asymmetric
coercive potential. We prove the existence of solutions for the system with
2-norm constraints. | 2211.10110v1 |
2022-12-12 | A universal and stable metasurface for photonic quasi bound state in continuum coupled with two dimensional semiconductors | Strong coupling of excitons to optical cavity modes is of immense importance
to understanding the fundamental physics of quantum electrodynamics at the
nanoscale as well as for practical applications in quantum information
technologies. There have been several attempts at achieving strong coupling
between excitons in t... | 2212.05951v1 |
2022-12-12 | Efficient simulation of open quantum systems coupled to a reservoir through multiple channels | The simulation of open quantum systems coupled to a reservoir through
multiple channels remains a substantial challenge. This kind of open quantum
system arises when considering the radiationless decay of excited states that
are coupled to molecular vibrations, for example. We use the chain mapping
strategy in the inte... | 2212.06099v1 |
2023-01-05 | A Minimization Problem with Free Boundary for $p$-Laplacian weakly coupled System | In this paper we consider a weakly coupled $p$-Laplacian system of a
Bernoulli type free boundary problem, through minimization of a corresponding
functional. We prove various properties of any local minimizer and the
corresponding free boundary. | 2301.02236v1 |
2023-02-17 | Multi-scalar theories of gravity with direct matter couplings and their parametrized post-Newtonian parameters | We study theories of gravity including, in addition to the metric, several
scalar fields in the gravitational sector. The particularity of this work is
that we allow for direct couplings between these gravitating scalars and the
matter sector, which can generally be different for the source and the probe of
gravity, in... | 2302.08941v2 |
2023-03-12 | Banach Couples. I. Elementary Theory | This note is an (exact) copy of the report of Jaak Peetre, "Banach Couples.
I. Elementary Theory". Published as Technical Report, Lund (1971). Some more
recent general references have been added and some references updated though | 2303.06622v1 |
2023-03-13 | Modifying the magnetoelectric coupling in TbMnO$_3$ by low-level Fe$^{3+}$ substitution | We report a comprehensive study of the low-level substitution of Mn$^{3+}$ by
Fe$^{3+}$ effect on the static and dynamic magnetoelectric coupling in
TbMn$_{1-x}$Fe$_x$O$_3$ ($x=0$, 0.02 and 0.04). The cationic substitution has a
large impact on the balance between competitive magnetic interactions and, as a
result, on ... | 2303.07029v1 |
2023-03-15 | ROSE: A Neurocomputational Architecture for Syntax | A comprehensive model of natural language processing in the brain must
accommodate four components: representations, operations, structures and
encoding. It further requires a principled account of how these components
mechanistically, and causally, relate to each another. While previous models
have isolated regions of... | 2303.08877v1 |
2023-03-17 | One-loop beta-functions of quartic enhanced tensor field theories | Enhanced tensor field theories (eTFT) have dominant graphs that differ from
the melonic diagrams of conventional tensor field theories. They therefore
describe pertinent candidates to escape the so-called branched polymer phase,
the universal geometry found for tensor models. For generic order $d$ of the
tensor field, ... | 2303.09829v3 |
2023-04-11 | Investigation of the concurrent effects of ALP-photon and ALP-electron couplings in Collider and Beam Dump Searches | Axion-like particles (ALPs) have been studied in numerous experiments to
search for their interactions, but most studies have focused on deriving bounds
for the single coupling. However, in ultraviolet (UV) models, these couplings
can appear simultaneously, and their interplay could have important
implications for coll... | 2304.05435v2 |
2023-04-16 | Analysis of strong coupling constant with machine learning and its application | In this work, we investigate the nature of the strong coupling constant and
related physics. Through the analysis of accumulated experimental data from
around the world, we employ the ability of machine learning to unravel its
physical laws. The result of our efforts is a formula that captures the
expansive panorama of... | 2304.07682v4 |
2023-05-07 | Higher-Order Network Interactions through Phase Reduction for Oscillators with Phase-Dependent Amplitude | Coupled oscillator networks provide mathematical models for interacting
periodic processes. If the coupling is weak, phase reduction -- the reduction
of the dynamics onto an invariant torus -- captures the emergence of collective
dynamical phenomena, such as synchronization. While a first-order approximation
of the dyn... | 2305.04277v2 |
2023-05-27 | Flavor Violating Di- Higgs Coupling | Di-Higgs couplings to fermions of the form $h^{2}\overline{f}f$ are absent in
the Standard Model, however, they are present in several physics Beyond
Standard Model (BSM) extensions, including those with vector-like fermions. In
Effective Field Theories (EFTs), such as the Standard Model Effective Field
Theory (SMEFT) ... | 2305.17362v1 |
2023-06-16 | System-bath entanglement of noninteracting fermionic impurities: Equilibrium, transient, and steady-state regimes | We investigate the behavior of entanglement between a single fermionic level
and a fermionic bath in three distinct thermodynamic regimes. First, in thermal
equilibrium, we analyze the dependence of entanglement on the considered
statistical ensemble: for the grand canonical state, it is generated only for a
sufficient... | 2306.09680v3 |
2023-07-21 | Observation of strong coupling between a mechanical oscillator and a cavity-magnon polariton | Cavity magnomechanics (CMM) is an emerging field and has received much
attention in the past decade. It deals with coherent couplings among microwave
cavity photons, magnons and vibration phonons. So far, all previous CMM
experiments have been operated in the weak-coupling regime. This considerably
limits prospective v... | 2307.11328v2 |
2023-08-03 | Microscopic Gyration with Dissipative Coupling | Microscopic gyrators, including Brownian gyrators (BGs), require anisotropic
fluctuations to perform gyration. It produces a finite current, driving the
system out of equilibrium. In a typical BG set-up with an isotropic colloidal
particle, the anisotropy sets in by the coupling among space dimensions via an
externally... | 2308.02085v1 |
2023-08-09 | Understanding the Nature of Vibro-Polaritonic States in Water and Heavy Water | One of the most popular subjects now being researched in molecular science is
strong light-matter coupling. The introduction of vibrational strong coupling
and the formation vibro-polaritonic states tend to modify chemical reactivity,
energy transfer, and many other physical properties of the coupled system. This
is ac... | 2308.04777v1 |
2023-08-09 | Strong Exciton-Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr | The layered, air-stable van der Waals antiferromagnetic compound CrSBr
exhibits pronounced coupling between its optical, electronic, and magnetic
properties. As an example, exciton dynamics can be significantly influenced by
lattice vibrations through exciton-phonon coupling. Using low-temperature
photoluminescence spe... | 2308.04895v2 |
2023-09-25 | Observational constraints on interactions between dark energy and dark matter with momentum and energy transfers | We place observational constraints on a dark energy (DE) model in which a
quintessence scalar field $\phi$ is coupled to dark matter (DM) through
momentum and energy exchanges.The momentum transfer is weighed by an
interaction between the field derivative and DM four velocity with a coupling
constant $\beta$, whereas t... | 2309.13946v2 |
2023-10-12 | A note on balance laws of coupled surface and bulk fluid flows | Balance laws of coupled bulk-surface-bulk fluid flows are considered. We
carefully investigate how do the interface conditions influence the total mass,
total momentum and total energy of the system. | 2310.08688v1 |
2023-10-31 | Experimental probes and theoretical concepts for BSM trilinear couplings: a case study for scalar top quarks | After the possible discovery of new particles, it will be crucial to
determine the properties, and in particular the couplings, of the new states.
Here, we focus on scalar trilinear couplings, employing as an example the case
of the trilinear coupling of scalar top quarks (stops) to the Higgs boson in
the Minimal Super... | 2310.20655v1 |
2023-11-01 | Analysis of the Single Reference Coupled Cluster Method for Electronic Structure Calculations: The Discrete Coupled Cluster Equations | Coupled cluster methods are widely regarded as the gold standard of
computational quantum chemistry as they are perceived to offer the best
compromise between computational cost and a high-accuracy resolution of the
ground state eigenvalue of the electronic Hamiltonian -- an unbounded,
self-adjoint operator acting on a... | 2311.00637v2 |
2023-11-05 | Topological spin-orbit-coupled fermions beyond rotating wave approximation | The realization of spin-orbit-coupled ultracold gases has driven a wide range
of researches and is typically based on the rotating wave approximation (RWA).
By neglecting the counter-rotating terms, RWA characterizes a single
near-resonant spin-orbit (SO) coupling in a two-level system. Here, we propose
and experimenta... | 2311.02584v1 |
2023-11-24 | Coupled Twiss Parameters Estimation from TbT Data | Linear optics parameters are often estimated using readily available
turn-by-turn (TbT) data. In-plane beta functions, which are the most common
measurement objectives, can be estimated from the amplitudes or phases of TbT
data, providing an overall characterization of the linear lattice. In addition
to estimating unco... | 2311.14287v2 |
2023-12-08 | Enhanced quantum sensing mediated by a cavity in open systems | We simulate the dynamics of systems with $N$ = 1-20 qubits coupled to a
cavity in order to assess their potential for quantum metrology of a parameter
in the open systems limit. The qubits and the cavity are both allowed to have
losses and the system is studied under various coupling strength regimes. The
focus is prim... | 2312.04766v1 |
2024-01-03 | Single-photon scattering in giant-atom waveguide systems with chiral coupling | We study single-photon scattering spectra of a giant atom chirally coupled to
a one-dimensional waveguide at multiple connection points, and examine
chirality induced effects in the scattering spectra by engineering the
chirality of the coupling strengths. We show that the transmission spectra
typically possess an anti... | 2401.01592v1 |
2024-01-09 | Electronic effects in radiation-induced collision cascades in nickel | The accurate treatment of electronic effects in multi-million atom
simulations of radiation-induced collision cascades is crucial for reliable
predictions of primary radiation damage. In this work, we explore the
performance of a recently developed two-temperature molecular dynamics model
implementing an electron densi... | 2401.04404v1 |
2023-12-24 | Deep Pulse-Coupled Neural Networks | Spiking Neural Networks (SNNs) capture the information processing mechanism
of the brain by taking advantage of spiking neurons, such as the Leaky
Integrate-and-Fire (LIF) model neuron, which incorporates temporal dynamics and
transmits information via discrete and asynchronous spikes. However, the
simplified biologica... | 2401.08649v1 |
2024-01-19 | An Experimental Estimation Method of Diffusion Coefficients in Ternary and Multicomponent Systems from a Single Diffusion Couple Profile | Until recently, it was textbook knowledge that the diffusion coefficients
could not be estimated in a multi-component system following the widely
practised diffusion couple method. The recently proposed constrained diffusion
couple methods need two intersecting diffusion paths in a multi-component space
with very well-... | 2401.10684v1 |
2024-01-22 | Gravitational collapse of matter in the presence of non-minimally coupled Quintessence and Phantom-like scalar fields | This paper explores the evolution of the over-dense region of dark matter in
the presence of a non-minimally coupled scalar field which is used to model
quintessence and phantom-like dark energy. We focus on algebraic coupling,
where the interaction Lagrangian is independent of the derivatives of the
scalar field. To m... | 2401.11957v1 |
2024-02-19 | Description of ultrastrong light-matter interaction through coupled harmonic oscillator models and their connection with cavity-QED Hamiltonians | Classical coupled harmonic oscillator models have been proven capable to
describe successfully the spectra of many nanophotonic systems where an optical
mode couples to a molecular or matter excitation. Although models with distinct
coupling terms have been proposed, they are used interchangeably due to their
similar r... | 2402.11944v1 |
2024-02-26 | Strong coupling yields abrupt synchronization transitions in coupled oscillators | Coupled oscillator networks often display transitions between qualitatively
different phase-locked solutions -- such as synchrony and rotating wave
solutions -- following perturbation or parameter variation. In the limit of
weak coupling, these transitions can be understood in terms of commonly studied
phase approximat... | 2402.16471v1 |
2024-03-10 | Coupled Dislocations and Fracture dynamics at finite deformation: model derivation, and physical questions | A continuum mechanical model of coupled dislocation based plasticity and
fracture at finite deformation is proposed. Motivating questions and target
applications of the model are sketched. | 2403.06061v2 |
2024-03-26 | Shape Optimization of Geometrically Nonlinear Modal Coupling Coefficients: An Application to MEMS Gyroscopes | Micro- and nanoelectromechanical system (MEMS and NEMS) resonators can
exhibit rich nonlinear dynamics as they are often operated at large amplitudes
with high quality factors and possess a high mode density with a variety of
nonlinear modal couplings. Their impact is strongly influenced by internal
resonance condition... | 2403.17679v1 |
2024-04-05 | Nonlocally coupled moisture model for convective self-aggregation | Clouds play a central role in climate physics by interacting with
precipitation, radiation, and circulation. Although the self-aggregation of
clouds is a fundamental problem in convective organization, a theoretical
explanation of how it occurs has not been established owing to its complexity.
Here, we introduce an ide... | 2404.04146v1 |
2024-04-08 | On a port-Hamiltonian formulation and structure-preserving numerical approximations for thermodynamic compressible fluid flow | The high volatility of renewable energies calls for more energy efficiency.
Thus, different physical systems need to be coupled efficiently although they
run on various time scales. Here, the port-Hamiltonian (pH) modeling framework
comes into play as it has several advantages, e.g., physical properties are
encoded in ... | 2404.05358v1 |
1999-02-08 | Non-linear coupling of spiral waves in disk galaxies: a numerical study | We present the results of two-dimensional numerical simulations of stellar
galactic disks, aimed at studying the non-linear coupling between bar and
spiral waves and modes, in disks with realistically peaked rotation profiles.
The power spectrum analysis of the perturbed density in the disk, for azimuthal
numbers rangi... | 9902125v1 |
1999-08-03 | Coupled Quintessence | A new component of the cosmic medium, a light scalar field or ''quintessence
'', has been proposed recently to explain cosmic acceleration with a dynamical
cosmological constant. Such a field is expected to be coupled explicitely to
ordinary matter, unless some unknown symmetry prevents it. I investigate the
cosmologic... | 9908023v1 |
2001-04-30 | Perturbation evolution with a non-minimally coupled scalar field | We recently proposed a simple dilaton-derived quintessence model in which the
scalar field was non-minimally coupled to cold dark matter, but not to
`visible' matter. Such couplings can be attributed to the dilaton in the low
energy limit of string theory, beyond tree level. In this paper we discuss the
implications of... | 0104464v4 |
2002-04-30 | Quintessence, super-quintessence and observable quantities in Brans-Dicke and non-minimally coupled theories | The different definitions for the equation of state of a non-minimally
coupled scalar field that have been introduced in the literature are analyzed.
Particular emphasis is made upon those features that could yield to an
observable way of distinguishing non-minimally coupled theories from General
Relativity, with the s... | 0204504v2 |
2006-01-16 | Constraints on the coupled quintessence from cosmic microwave background anisotropy and matter power spectrum | We discuss the evolution of linear perturbations in a quintessence model in
which the scalar field is non-minimally coupled to cold dark matter. We
consider the effects of this coupling on both cosmic microwave background
temperature anisotropies and matter perturbations. Due to the modification of
the scale of cold da... | 0601333v1 |
1994-11-06 | M-furcations in coupled maps | We study the scaling behavior of $M$-furcation $(M\!=\!2, 3, 4,\dots)$
sequences of $M^n$-period $(n=1,2,\dots)$ orbits in two coupled one-dimensional
(1D) maps. Using a renormalization method, how the scaling behavior depends on
$M$ is particularly investigated in the zero-coupling case in which the two 1D
maps become... | 9411003v1 |
1996-12-05 | Synchronization of Spatiotemporal Chaos: The regime of coupled Spatiotemporal Intermittency | Synchronization of spatiotemporally chaotic extended systems is considered in
the context of coupled one-dimensional Complex Ginzburg-Landau equations
(CGLE). A regime of coupled spatiotemporal intermittency (STI) is identified
and described in terms of the space-time synchronized chaotic motion of
localized structures... | 9612011v1 |
1994-04-26 | Relation of Extended Van Hove Singularities to High-Temperature Superconductivity within Strong-Coupling Theory | Recent angle-resolved photoemission (ARPES) experiments have indicated that
the electronic dispersion in some of the cuprates possesses an extended saddle
point near the Fermi level which gives rise to a density of states that
diverges like a power law instead of the weaker logarithmic divergence usually
considered. We... | 9404081v1 |
1994-05-16 | Spin Gaps in Coupled t-J Ladders | Spin gaps in coupled $t$-$J$ ladders are investigated by exact
diagonalization of small clusters up to 4$\times$8 sites. At half-filling, the
numerical results for the triplet excitation spectrum are in very good
agreement with a second order perturbation expansion in term of small
inter-ladder and intra-ladder exchang... | 9405045v1 |
1995-10-06 | Van Hove Exciton-Cageons and High-T$_c$ Superconductivity: XB: Polaronic Coupling in the Doped Material | A purely ionic interpretation of the tilting mode instabilities in
La$_{2-x}$A$ _x$CuO$_4$ (A=Sr,Ba) is shown to be not self-consistent: the
dominant factor influencing the doping dependence of the interlayer mismatch is
the large change in the Cu-O bond length, which in turn leads to a strong
electron-phonon coupling.... | 9510034v1 |
1995-10-26 | Properties of lightly doped t-J two-leg ladders | We have numerically investigated the doped t-J ladder using exact
diagonalization. We have studied both the limit of strong inter-chain coupling
and isotropic coupling. The ladder scales to the Luther-Emery liquid regime in
the strong inter-chain coupling limit. In this strong coupling limit there is a
simple picture o... | 9510150v1 |
1997-10-16 | Hole doping and disorder effects on the one-dimensional Kondo lattice, for ferromagnetic Kondo couplings | We investigate the one-dimensional Kondo lattice model (1D KLM) for
ferromagnetic Kondo couplings. The so-called ferromagnetic 2-leg spin ladder
and the S=1 antiferromagnet occur as new one-dimensional Kondo insulators. Both
exhibit a spin gap. But, in contrast to the strong coupling limit, the Haldane
state which char... | 9710166v1 |
1998-05-04 | A Renormalization Group Study of Asymetrically Coupled Minimal Models | We investigate the renormalization group flows and fixed point structure of
many coupled minimal models. The models are coupled two by two by energy-energy
couplings. We take the general approach where the bare couplings are all taken
to be independent. New fixed points are found for N models (N>3). At these
fixed poin... | 9805026v1 |
1998-07-06 | The XY Spin-Glass with Slow Dynamic Couplings | We investigate an XY spin-glass model in which both spins and couplings
evolve in time: the spins change rapidly according to Glauber-type rules,
whereas the couplings evolve slowly with a dynamics involving spin correlations
and Gaussian disorder. For large times the model can be solved using replica
theory. In contra... | 9807082v1 |
1998-07-23 | The optical response of Ba_{1-x}K_xBiO_3: Evidence for an unusual coupling mechanism of superconductivity? | We have analysed optical reflectivity data for Ba_{1-x}K_xBiO_3 in the
far-infrared region using Migdal-Eliashberg theory and found it inconsistent
with standard electron-phonon coupling: Whereas the superconducting state data
could be explained using moderate coupling, \lambda=0.7, the normal state
properties indicate... | 9807314v1 |
1998-08-27 | Mean-Field Theory for Spin Ladders Using Angular-Momentum Coupled Bases | We study properties of two-leg Heisenberg spin ladders in a mean-field
approximation using a variety of angular-momentum coupled bases. The mean-field
theory proposed by Gopalan, Rice, and Sigrist, which uses a rung basis, assumes
that the mean-field ground state consists of a condensate of spin-singlets
along the rung... | 9808310v1 |
1999-09-09 | Superexchange via Cluster States: Calculations of Spin-Phonon Coupling Constants for CuGeO3 | Calculations for spin-phonon coupling constants in CuGeO3 are presented,
applying fourth order superexchange perturbation theory to an extended Hubbard
model. In our treatment, the intermediate oxygen ligand states are described by
band-like cluster states, due to the presence of significant O(p)-O(p) hopping.
We also ... | 9909134v1 |
1999-10-07 | Spin interactions and switching in vertically tunnel-coupled quantum dots | We determine the spin exchange coupling J between two electrons located in
two vertically tunnel-coupled quantum dots, and its variation when magnetic (B)
and electric (E) fields (both in-plane and perpendicular) are applied. We
predict a strong decrease of J as the in-plane B field is increased, mainly due
to orbital ... | 9910105v1 |
1999-11-29 | Spike-train responses of a pair of Hodgkin-Huxley neurons coupled by excitatory and inhibitory synapses and axons with time delay | Numerical calculations have been made on the spike-train response of a pair
of Hodgkin-Huxley (HH) neurons coupled by synapses and axons with time delay.
The recurrent excitatory-excitatory, inhibitory-inhibitory,
excitatory-inhibitory, and inhibitory-excitatory couplings are adopted. The
coupled, excitable HH neurons ... | 9911472v1 |
1999-12-23 | Phonon-Coupled Electron Tunneling in Two and Three-Dimensional Tunneling Configurations | We treat a tunneling electron coupled to acoustical phonons through a
realistic electron phonon interaction: deformation potential and piezoelectric,
in two or three-dimensional tunneling configurations. Making use of slowness of
the phonon system compared to electron tunneling, and using a Green function
method for im... | 9912427v1 |
2001-05-21 | Calculation of mode coupling for quadrupole excitations in a Bose-Einstein condensate | In this paper we give a theoretical description of resonant coupling between
two collective excitations of a Bose condensed gas (BEC) on, or close, to a
second harmonic resonance. Using analytic expressions for the quasi-particle
wavefunctions we show that the coupling between quadrupole modes is strong,
leading to a c... | 0105394v1 |
2001-09-19 | Synchronous phase clustering in a network of neurons with spatially decaying excitatory coupling | Synchronization is studied in a spatially-distributed network of
weekly-coupled, excitatory neurons of Hodgkin-Huxley type. All neurons are
coupled to each other synaptically with a fixed time delay and a coupling
strength inversely proportional to the distance between two neurons. We found
that a robust, noise-resista... | 0109332v1 |
2002-02-08 | BEDT-TTF organic superconductors: the entangled role of phonons | We calculate the lattice phonons and the electron-phonon coupling of the
organic superconductor \kappa-(BEDT-TTF)_2 I_3, reproducing all available
experimental data connected to phonon dynamics. Low-frequency intra-molecular
vibrations are strongly mixed to lattice phonons. Both acoustic and optical
phonons are appreci... | 0202141v3 |
2003-02-11 | Peierls transition in the presence of finite-frequency phonons in the one-dimensional extended Peierls-Hubbard model at half-filling | We report quantum Monte Carlo (stochastic series expansion) results for the
transition from a Mott insulator to a dimerized Peierls insulating state in a
half-filled, 1D extended Hubbard model coupled to optical bond phonons. Using
electron-electron (e-e) interaction parameters corresponding approximately to
polyacetyl... | 0302220v1 |
2003-02-17 | Structural Aspects of Magnetic Coupling in CaCu3Mn4O12 and CaCu3Ti4O12 | Two perovskite-derived materials, CaCu3Mn4O12 and CaCu3Ti4O12, have drawn
much recent interest due to their magnetoresistive, dielectric, and
magnetoelectronic characteristics. Here we present initial theoretical insights
into each of these points, based on first principles, density functional based
calculations. Our r... | 0302343v1 |
2003-05-28 | Strong Coupling Expansion for the Pairing Hamiltonian | The paper is devoted to the effects of superconducting pairing in small
metallic grains. It turns out that at strong superconducting coupling and in
the limit of large Thouless conductance one can explicitly determine the low
energy spectrum of the problem. We start with the strong coupling limit and
develop a systemat... | 0305635v1 |
2003-06-11 | Density matrix renormalization group study of the charging of a quantum dot strongly coupled to a single lead | A new application of the density matrix renormalization group (DMRG) method
to a system composed of an interacting dot coupled to a infinite one
dimensional lead is presented. This method enables one to study the influence
of the coupling to an external lead on the thermodynamical properties of the
dot. It is shown tha... | 0306284v1 |
2003-07-07 | Quasistates in a ring coupled to a reservoir and their relation to the Dicke effect | We study the energy spectrum and the persistent current in an ideal
one-dimensional mesoscopic ring coupled to an external fermionic reservoir. The
contact between ring and reservoir is described by a tunneling operator, which
causes an indirect coupling between different ring states via states in the
reservoir. For st... | 0307136v1 |
2003-07-30 | Neel to spin-Peierls transition in the ground state of a quasi-1D Heisenberg model coupled to bond phonons | The spin-Peierls transition in the ground state of a quasi-one-dimensional
spin-1/2 Heisenberg model coupled to adiabatic bond phonons is studied using a
quantum Monte Carlo (QMC) method. The transition from a gapless Neel state to a
spin-gapped Peierls state is explored in the parameter space spanned by the
spatial an... | 0307746v1 |
2004-01-15 | Ferrimagnetic mixed-spin ladders in weak and strong coupling limits | We study two similar spin ladder systems with the ferromagnetic leg coupling.
First model includes two sorts of spins, s= 1/2 and s= 1, and the second model
comprises only s=1/2 legs coupled by a "triangular" rung exchange. The
antiferromagnetic (AF) rung coupling destroys the long-range order and
eventually makes the ... | 0401264v2 |
2004-04-01 | Electronic Structure and Electron-Phonon Coupling in the 18K Superconductor Y2C3 | The electronic structure and electron-phonon coupling in Y2C3 is investigated
using density functional calculations. We find that the Fermi level falls in a
manifold of mixed character derived from Y d states and antibonding states
associated with the C dimers in the structure. Calculations of the
electron-phonon coupl... | 0404031v1 |
2004-05-26 | Vortex in Maxwell-Chern-Simons models coupled to external backgrounds | We consider Maxwell-Chern-Simons models involving different non-minimal
coupling terms to a non relativistic massive scalar and further coupled to an
external uniform background charge. We study how these models can be
constrained to support static radially symmetric vortex configurations
saturating the lower bound for... | 0405605v1 |
2004-06-08 | Enhancing complex-network synchronization | Heterogeneity in the degree (connectivity) distribution has been shown to
suppress synchronization in networks of symmetrically coupled oscillators with
uniform coupling strength (unweighted coupling). Here we uncover a condition
for enhanced synchronization in directed networks with weighted coupling. We
show that, in... | 0406207v1 |
2004-07-26 | Quantum computation with Josephson-qubits by using a current-biased information bus | We propose an effective scheme for manipulating quantum information stored in
a superconducting nanocircuit. The Josephson qubits are coupled via their
separate interactions with an information bus, a large current-biased Josephson
junction treated as an oscillator with adjustable frequency. The bus is
sequentially cou... | 0407667v2 |
2004-10-08 | van der Waals coupling in atomically doped carbon nanotubes | We have investigated atom-nanotube van der Waals (vdW) coupling in atomically
doped carbon nanotubes (CNs). Our approach is based on the perturbation theory
for degenerated atomic levels, thus accounting for both weak and strong
atom-vacuum-field coupling. The vdW energy is described by an integral equation
represented... | 0410216v1 |
2005-01-07 | Long Josephson Junction in a Resonant Cavity | We present a model to describe an underdamped long Josephson junction coupled
to a singlemode electromagnetic cavity, and carry out numerical calculations
using this model in various regimes. The coupling may occur through either the
electric or the magnetic eld of the cavity mode. When a current is injected
into the j... | 0501147v1 |
2005-01-18 | Phase diagram of the one-dimensional, two-channel Kondo lattice model | Employing the density matrix renormalization group method and strong-coupling
perturbation theory, we study the phase diagram of the SU(2)xSU(2) Kondo
lattice model in one dimension. We show that, at quarter filling, the system
can exist in two phases depending on the coupling strength. The weak-coupling
phase is domin... | 0501430v1 |
2005-01-22 | Asymmetrically coupled directed percolation systems | We introduce a dynamical model of coupled directed percolation systems with
two particle species. The two species $A$ and $B$ are coupled asymmetrically in
that $A$ particles branch $B$ particles whereas $B$ particles prey on $A$
particles. This model may describe epidemic spreading controlled by reactive
immunization ... | 0501542v1 |
2005-05-30 | Charge order induced by electron-lattice interaction in NaV2O5 | We present Density Matrix Renormalization Group calculations of the
ground-state properties of quarter-filled ladders including static
electron-lattice coupling. Isolated ladders and two coupled ladders are
considered, with model parameters obtained from band-structure calculations for
$\alpha^\prime$-NaV$_2$O$_5$. The... | 0505685v1 |
2005-06-10 | Extension of Frohlich's method to 4-fermion interactions | Higher order terms of the transformed electron-phonon Hamiltonian, obtained
by performing the Frohlich's transformation, are investigated. The influence of
terms discarded by Frohlich (in particular those proportional to the third
power of electron-phonon coupling) on the effective Hamiltonian is examined. To
this end ... | 0506248v2 |
2005-07-18 | Coupled ferro-antiferromagnetic Heisenberg bilayers investigated by many-body Green's function theory | A theory of coupled ferro- and antiferromagnetic Heisenberg layers is
developed within the framework of many-body Green's function theory (GFT) that
allows non-collinear magnetic arrangements by introducing sublattice
structures. As an example, the coupled ferro- antiferromagnetic (FM-AFM)
bilayer is investigated. We c... | 0507408v1 |
2006-02-23 | Ion implanted Si:P double-dot with gate tuneable interdot coupling | We report on millikelvin charge sensing measurements of a silicon double-dot
system fabricated by phosphorus ion implantation. An aluminum single-electron
transistor (SET) is capacitively coupled to each of the implanted dots enabling
the charging behavior of the double-dot system to be studied independently of
current... | 0602538v1 |
2006-02-23 | Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots | We theoretically investigate electron transport through an Aharonov-Bohm
interferometer containing laterally coupled double quantum dots. We introduce
the indirect coupling parameter $\alpha$, which characterizes the strength of
the coupling via the reservoirs between two quantum dots. $|\alpha|=1$
indicates the strong... | 0602539v2 |
2006-03-02 | Vertically coupled double quantum rings at zero magnetic field | Within local-spin-density functional theory, we have investigated the
`dissociation' of few-electron circular vertical semiconductor double quantum
ring artificial molecules at zero magnetic field as a function of inter-ring
distance. In a first step, the molecules are constituted by two identical
quantum rings. When t... | 0603040v1 |
2006-06-21 | Strong Electron-Phonon Coupling in Yttrium under Pressure | Linear response methods are applied to identify the increase in
electron-phonon coupling in elemental yttrium that is responsible for its high
superconducting critical temperature Tc, which reaches nearly 20 K at 115 GPa.
While the evolution of the band structure and density of states is smooth and
seemingly modest, th... | 0606538v1 |
2006-07-03 | Transport through two-level quantum dots weakly coupled to ferromagnetic leads | Spin-dependent transport through a two-level quantum dot in the sequential
tunneling regime is analyzed theoretically by means of a real-time diagrammatic
technique. It is shown that the current, tunnel magnetoresistance, and shot
noise (Fano factor) strongly depend on the transport regime, providing a
detailed informa... | 0607039v3 |
2006-07-07 | Controllable Coupling between Flux Qubit and Nanomechanical Resonator by Magnetic Field | We propose an active mechanism for coupling the quantized mode of a
nanomechanical resonator to the persistent current in the loop of a
superconducting Josephson junction (or phase slip) flux qubit. This coupling is
independently controlled by an external coupling magnetic field. The whole
system forms a novel solid-st... | 0607180v2 |
2006-10-19 | ARPES Spectra of Bi2212 give the Coulomb Coupling $λ^{C}\approx 1$ and the Electron-Phonon Coupling $λ^{EP}=2-3$ | We show that the double kink-structure in the electronic self-energy of
Bi2212 near the nodal point at low energy $\omega_{1}\approx 50-70$ $meV$ and
at high energy at $\omega_{2}\approx 350$ $meV$, observed recently in the ARPES
measurements by Valla et al \cite{Valla-2006}, gives that the electron-phonon
(EPI) coupli... | 0610549v2 |
2006-10-23 | Strong vs. Weak Coupling Duality and Coupling Dependence of the Kondo Temperature in the Two-Channel Kondo Model | We perform numerical renormalization group (NRG) as well as analytical
calculations for the two-channel Kondo model to obtain the dependence of the
Kondo temperature $T_K$ on the dimensionless (bare) spin exchange coupling $g$
over the complete parameter range from $g\ll 1$ to $g\gg 1$. We show that there
exists a dual... | 0610631v2 |
2007-03-11 | Strong electron-phonon coupling in the rare-earth carbide superconductor La2C3 | We present the results of a crystal structure determination using neutron
powder diffraction as well as the superconducting properties of the rare-earth
sesquicarbide La2C3 (Tc ~ 13.4 K) by means of specific heat and upper critical
field measurements. From the detailed analysis of the specific heat and a
comparison wit... | 0703279v1 |
2007-03-23 | Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior | We study Landau-Zener transitions in a qubit coupled to a bath at zero
temperature. A general formula is derived that is applicable to models with a
non-degenerate ground state. We calculate exact transition probabilities for a
qubit coupled to either a bosonic or a spin bath. The nature of the baths and
the qubit-bath... | 0703596v2 |
2006-12-07 | Decentralized Maximum Likelihood Estimation for Sensor Networks Composed of Nonlinearly Coupled Dynamical Systems | In this paper we propose a decentralized sensor network scheme capable to
reach a globally optimum maximum likelihood (ML) estimate through
self-synchronization of nonlinearly coupled dynamical systems. Each node of the
network is composed of a sensor and a first-order dynamical system initialized
with the local measur... | 0612042v1 |
2005-11-16 | Non-Abelian Einstein-Born-Infeld-Dilaton Cosmology | The non-abelian Einstein-Born-Infeld-Dilaton theory, which rules the dynamics
of tensor-scalar gravitation coupled to a $su(2)$-valued gauge field ruled by
Born-Infeld lagrangian, is studied in a cosmological framework. The microscopic
energy exchange between the gauge field and the dilaton which results from a
non-uni... | 0511090v2 |
2005-11-30 | Coupling of spacetime atoms and spin foam renormalisation from group field theory | We study the issue of coupling among 4-simplices in the context of spin foam
models obtained from a group field theory formalism. We construct a
generalisation of the Barrett-Crane model in which an additional coupling
between the normals to tetrahedra, as defined in different 4-simplices that
share them, is present. T... | 0512002v1 |
2006-02-24 | Dynamics of Scalar Field in Polymer-like Representation | In recent twenty years, loop quantum gravity, a background independent
approach to unify general relativity and quantum mechanics, has been widely
investigated. We consider the quantum dynamics of a real massless scalar field
coupled to gravity in this framework. A Hamiltonian operator for the scalar
field can be well ... | 0602101v1 |
2006-06-19 | Loop cosmological implications of a non-minimally coupled scalar field | Non-minimal actions with matter represented by a scalar field coupled to
gravity are considered in the context of a homogeneous and isotropic universe.
The coupling is of the form $-\xi/2 \phi^2 R$. The possibility of successful
inflation is investigated taking into account features of loop cosmology. For
that end a co... | 0606082v1 |
2005-12-15 | Search for Anomalous Couplings in Top Decay at Hadron Colliders | We present a quantitative study on sensitivities to the top-decay anomalous
couplings, taking into account realistic experimental conditions expected at
Tevatron and LHC. A double angular distribution of W and charged lepton in the
top decay is analyzed, using ttbar events in the lepton+jets channel. In order
to improv... | 0512037v1 |
1992-10-19 | Fermion-Higgs model with strong Wilson-Yukawa coupling in two dimensions | The fermion mass spectrum is studied in the quenched approximation in the
strong coupling vortex phase (VXS) of a globally U(1)$_L \otimes$U(1)$_R$
symmetric scalar-fermion model in two dimensions. In this phase fermion
doublers can be completely removed from the physical spectrum by means of a
strong Wilson-Yukawa cou... | 9210022v1 |
1994-06-02 | Radiative Corrections to the Kinetic Couplings in Nonrelativistic Lattice QCD | The heavy-quark mass and wave function renormalizations, energy shift, and
radiative corrections to two important couplings, the so-called kinetic
couplings, in nonrelativistic lattice QCD are determined to leading order in
tadpole-improved perturbation theory. The scales at which to evaluate the
running QCD coupling f... | 9406002v1 |
1994-12-04 | How to Accurately Extract the Running Coupling of QCD from Lattice Potential Data | By (a) using an expression for the LATTICE potential of QCD in terms of a
CONTINUUM running coupling and (b) globally parameterizing this coupling to
interpolate between 2- (or higher-) loop QCD in the UV and the flux tube
prediction in the IR, we can perfectly fit lattice data for the potential down
to ONE lattice spa... | 9412022v1 |
1995-06-01 | Four-point renormalized coupling constant in O(N) models | The renormalized zero-momentum four-point coupling $g_r$ of O(N)-invariant
scalar field theories in $d$ dimensions is studied by applying the 1/N
expansion and strong coupling analysis. The O(1/N) correction to the
$\beta$-function and to the fixed point value $g_r^*$ are explictly computed.
Strong coupling series for ... | 9506002v1 |
1995-09-05 | Four-point renormalized coupling constant in O(N) models | The renormalized zero-momentum four-point coupling $g_r$ of $O(N)$-invariant
scalar field theories in $d$ dimensions is studied by applying the $1/N$
expansion and strong coupling analysis. The $O(1/N)$ correction to the
$\beta$-function and to the fixed point value $g_r^*$ are explictly computed.
Strong coupling serie... | 9509005v1 |
1997-09-30 | The Schrödinger functional running coupling with staggered fermions and its application to many flavor QCD | We discuss the Schr\"odinger functional in lattice QCD with staggered
fermions and relate it, in the classical continuum limit, to the Schr\"odinger
functional regularized with Wilson fermions. We compute the strong coupling
constant defined via the Schr\"odinger functional with staggered fermions at
one loop and show ... | 9709159v1 |
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