publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2010-11-22 | Amplitude equations and fast transition to chaos in rings of coupled oscillators | We study the coupling induced destabilization in an array of identical
oscillators coupled in a ring structure where the number of oscillators in the
ring is large. The coupling structure includes different types of interactions
with several next neighbors. We derive an amplitude equation of Ginzburg-Landau
type, which... | 1011.4786v2 |
2010-12-07 | Composite Higgs Boson Pair Production at the LHC | The measurement of the trilinear and quartic Higgs self-couplings is
necessary for the reconstruction of the Higgs potential. This way the Higgs
mechanism as the origin of electroweak symmetry breaking can be tested. The
couplings are accessible in multi-Higgs production processes at the LHC. In
this paper we investiga... | 1012.1562v1 |
2010-12-11 | Nonminimal curvature-matter coupled wormholes with matter satisfying the null energy condition | Recently, exact solutions of wormhole geometries supported by a nonminimal
curvature-matter coupling were found, where the nonminimal coupling minimizes
the violation of the null energy condition of normal matter at the throat. In
this brief report, we present a solution where normal matter satisfies the
energy conditi... | 1012.2443v1 |
2010-12-21 | Kondo effects and shot noise enhancement in a laterally coupled double quantum dot | The spin and orbital Kondo effects and the related shot noise for a laterally
coupled double quantum dot are studied taking account of coherent indirect
coupling via a reservoir. We calculate the linear conductance and shot noise
for various charge states to distinguish between the spin and orbital Kondo
effects. We fi... | 1012.4838v1 |
2010-12-29 | The bulk transition of many-flavour QCD and the search for a UVFP at strong coupling | We explore the nature of the bulk transition observed at strong coupling in
the SU(3) gauge theory with Nf=12 fermions in the fundamental representation.
The transition separates a weak coupling chirally symmetric phase from a strong
coupling chirally broken phase and is compatible with the scenario where
conformality ... | 1012.5971v1 |
2011-01-04 | The quantum description and stimulated emission radiation of coupled metamaterials | In recent years, there has been increasing interest in studying the quantum
characteristics in plasmonic metamaterials. By using the Hamiltonian combined
with second quantization, we have investigated the basic excitation of the
coupled metamaterials and presented a quantum description of them. The
interaction between ... | 1101.0733v1 |
2011-01-11 | Analog of Electromagnetically Induced Transparency Effect for Two Nano/Micro-mechanical Resonators Coupled With Spin Ensemble | We study a hybrid nano-mechanical system coupled to a spin ensemble as a
quantum simulator to favor a quantum interference effect, the
electromagnetically induced transparency (EIT). This system consists of two
nano-mechanical resonators (NAMRs), each of which coupled to a nuclear spin
ensemble. It could be regarded as... | 1101.2115v1 |
2011-01-12 | Dynamics of a driven spin coupled to an antiferromagnetic spin bath | We study the behavior of the Rabi oscillations of a driven central spin
(qubit) coupled to an antiferromagnetic spin bath (environment). It is found
that the decoherence behavior of the central spin depends on the detuning,
driving strength, the qubit-bath coupling and an important factor, associated
with the number of... | 1101.2386v1 |
2011-01-27 | Interfacial thermal transport in atomic junctions | We study ballistic interfacial thermal transport across atomic junctions.
Exact expressions for phonon transmission coefficients are derived for thermal
transport in one-junction and two-junction chains, and verified by numerical
calculation based on a nonequilibrium Green's function method. For a
single-junction case,... | 1101.5225v1 |
2011-02-07 | Ab initio coupled-cluster theory for open-shell nuclei | We develop a new method to describe properties of truly open-shell nuclei.
This method is based on single-reference coupled-cluster theory and the
equation-of-motion method with extensions to nuclei with $A\pm 2$ nucleons
outside a closed shell. We perform proof-of-principle calculations for the
ground states of the he... | 1102.1293v1 |
2011-02-15 | Improvement of BP-Based CDMA Multiuser Detection by Spatial Coupling | Kudekar et al. proved that the belief-propagation (BP) threshold for
low-density parity-check codes can be boosted up to the maximum-a-posteriori
(MAP) threshold by spatial coupling. In this paper, spatial coupling is applied
to randomly-spread code-division multiple-access (CDMA) systems in order to
improve the perfor... | 1102.3061v3 |
2011-02-19 | Strong coupling of two interacting excitons confined in a nanocavity-quantum-dot system | We present a study of the strong coupling between radiation and matter,
considering a system of two quantum dots, which are in mutual interaction and
interacting with a single mode of light confined in a semiconductor nanocavity.
We take into account dissipative mechanisms such as the escape of the cavity
photons, deca... | 1102.4007v2 |
2011-03-03 | Yes-go cross-couplings in collections of tensor fields with mixed symmetries of the type (3,1) and (2,2) | Under the hypotheses of analyticity, locality, Lorentz covariance, and
Poincare invariance of the deformations, combined with the requirement that the
interaction vertices contain at most two space-time derivatives of the fields,
we investigate the consistent cross-couplings between two collections of tensor
fields wit... | 1103.0634v1 |
2011-03-03 | Quantum communication through Jaynes-Cummings-Hubbard arrays | We study the dynamics of an one dimensional array of Jaynes-Cummings-Hubbard
system of arbitrary number of coupled cavities, each containing a two level
atom that interacts with a field mode. In particular, we consider propagation
of a single excitation quantum state for two different couplings of the
photonic modes of... | 1103.0640v1 |
2011-03-07 | Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal phase-transition ferromagnets | The magnetostructural coupling between the structural and the magnetic
transition plays a crucial role in magnetoresponsive effects in a
martensitic-transition system. A combination of various magnetoresponsive
effects based on this coupling may facilitate the multifunctional applications
of a host material. Here, we d... | 1103.1313v2 |
2011-03-11 | Influence of correlations on transitive electron-phonon couplings in cuprate superconductors | We investigate a model for the CuO_2 plane of high-T_c superconductors where
the charge carriers are coupled to A_{1g} and B_{1g} symmetric out-of plane
vibrations of the oxygen atoms in the presence of local Hubbard correlations.
The coupling is implemented via a modulation of the hopping integral and we
calculate the... | 1103.2320v1 |
2011-03-15 | Limits on Anomalous Trilinear Gauge Couplings in Zgamma Events from ppbar Collisions at sqrt{s} = 1.96 TeV | Using \Zg\ candidate events collected by the CDF detector at the Tevatron
Colli\der, we search for potential anomalous (non-standard-model) couplings
between t\he $Z$ boson and the photon. \Zg\ couplings vanish at tree level and
are heavil\y suppressed at higher orders; hence any evidence of couplings
indicates new ph\... | 1103.2990v2 |
2011-03-17 | Exact mean field inference in asymmetric kinetic Ising systems | We develop an elementary mean field approach for fully asymmetric kinetic
Ising models, which can be applied to a single instance of the problem. In the
case of the asymmetric SK model this method gives the exact values of the local
magnetizations and the exact relation between equal-time and time-delayed
correlations.... | 1103.3433v3 |
2011-03-29 | Scalar Decay Constant and Yukawa Coupling in Walking Gauge Theories | We propose an approach for the calculation of the yukawa coupling through the
scalar decay constant and the chiral condensate in the context of the extended
technicolor (ETC). We perform the nonperturbative computation of the yukawa
coupling based on the improved ladder Schwinger-Dyson equation. It turns out
that the y... | 1103.5576v3 |
2011-04-04 | Topological phase transitions between chiral and helical spin textures in a lattice with spin-orbit coupling and a magnetic field | We consider the combined effects of large spin-orbit couplings and a
perpendicular magnetic field in a 2D honeycomb fermionic lattice. This system
provides an elegant setup to generate versatile spin textures propagating along
the edge of a sample. The spin-orbit coupling is shown to induce topological
phase transition... | 1104.0643v2 |
2011-04-14 | Coupled magnetic-ferroelectric metal-insulator transitions in epitaxially-strained SrCoO$_{3}$ from first principles | First-principles calculations of the epitaxial-strain phase diagram of
perovskite SrCoO$_{3}$ are presented. Through combination of the large
spin-phonon coupling with polarization-strain coupling and coupling of the band
gap to the polar distortion, both tensile and compressive epitaxial strain are
seen to drive the b... | 1104.2856v1 |
2011-04-30 | Robustness of spin-coupling distributions for perfect quantum state transfer | The transmission of quantum information between different parts of a quantum
computer is of fundamental importance. Spin chains have been proposed as
quantum channels for transferring information. Different configurations for the
spin couplings were proposed in order to optimize the transfer. As
imperfections in the cr... | 1105.0071v1 |
2011-05-04 | Coupled Graphical Models and Their Thresholds | The excellent performance of convolutional low-density parity-check codes is
the result of the spatial coupling of individual underlying codes across a
window of growing size, but much smaller than the length of the individual
codes. Remarkably, the belief-propagation threshold of the coupled ensemble is
boosted to the... | 1105.0785v1 |
2011-05-04 | Interplay of couplings between antiferrodistortive, ferroelectric, and strain degrees of freedom in monodomain PbTiO$_{3}$/SrTiO$_{3}$ superlattices | We report first-principles calculations on the coupling between epitaxial
strain, polarization, and oxygen octahedra rotations in monodomain
(PbTiO$_{3}$)$_{n}$/(SrTiO$_{3}$)$_{n}$ superlattices. We show how the
interplay between (i) the epitaxial strain and (ii) the electrostatic
conditions, can be used to control the... | 1105.0804v2 |
2011-05-06 | Measuring Top Squark Interactions With The Standard Model Through Associated Production | A new particle's interactions can be measured at colliders, by observing its
associated production with Standard Model particles. We focus on the case of a
collider-stable right-handed top squark and study the LHC sensitivities to its
couplings to the photon, Z, and the Higgs boson. Such measurements determine
the top ... | 1105.1332v2 |
2011-05-07 | Enhanced Coherence of a Quantum Doublet Coupled to Tomonaga-Luttinger Liquid Leads | We use boundary field theory to describe the phases accessible to a
tetrahedral qubit coupled to Josephson junction chains acting as
Tomonaga-Luttinger liquid leads. We prove that, in a pertinent range of the
fabrication and control parameters, an attractive finite coupling fixed point
emerges due to the geometry of th... | 1105.1443v2 |
2011-05-13 | Quantitative reliability of Migdal-Eliashberg theory for strong electron-phonon coupling | We reassess the validity of Migdal-Eliashberg (ME) theory for coupled
electron-phonon systems for large couplings $\lambda$. Although model
calculations have found that ME theory breaks down for $\lambda\sim 0.5$, it is
routinely applied for $\lambda>1$ to strong coupling superconductors. To
resolve this discrepancy it... | 1105.2833v3 |
2011-05-17 | Jaynes Cummings treatment of superconducting resonators with dielectric loss due to two-level systems | We perform a quantum mechanical analysis of superconducting resonators
subject to dielectric loss arising from charged two-level systems. We present
numerical and analytical descriptions of the dynamics of energy decay from the
resonator within the Jaynes-Cummings model. Our analysis allows us to
distinguish the strong... | 1105.3446v1 |
2011-05-20 | Fluxon analogues and dark solitons in linearly coupled Bose-Einstein condensates | Two effectively one-dimensional parallel coupled Bose-Einstein condensates in
the presence of external potentials are studied. The system is modelled by
linearly coupled Gross-Pitaevskii equations. In particular, grey-soliton-like
solutions representing analogues of superconducting Josephson fluxons as well
as coupled ... | 1105.4030v2 |
2011-05-25 | Anomalous Higgs Couplings at the LHC | We discuss the impact and potential discovery of physics beyond the Standard
Model, coupling to the Higgs sector, at the LHC. Using a model-independent
effective Lagrangian approach, pure Higgs and Higgs-gauge operators are
analyzed, and their origin in terms of tree-level exchange of unknown heavy
messengers is system... | 1105.5140v2 |
2011-06-07 | Decoherence of Coupled Quantum Oscillators: Going Beyond the Caldeira-Leggett Approximation | We calculate the reduced density matrix for a system of coupled harmonic
oscillators in a bosonic heat bath using the Born-Markov approximation and show
that the expectation values of position and momentum evolve like classical
quantities. We consider the cases where every oscillator is coupled to its own
reservoir and... | 1106.1371v2 |
2011-06-18 | Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling | We discuss the evolution from BCS to BEC superfluids in the presence of
spin-orbit coupling, and show that this evolution is just a crossover in the
balanced case. The dependence of several thermodynamic properties, such as the
chemical potential, order parameter, pressure, entropy, isothermal
compressibility and spin ... | 1106.3613v1 |
2011-06-20 | Yukawa alignment from natural flavor conservation | We study the charged Higgs couplings to fermions in the "democratic"
three-Higgs-doublet model, in which one doublet couples to down-type quarks,
one to up-type quarks, and one to charged leptons. Flavor-changing neutral
Higgs couplings are absent because the Glashow-Weinberg-Paschos condition for
natural flavor conser... | 1106.4039v3 |
2011-06-21 | Percolation in Interdependent and Interconnected Networks: Abrupt Change from Second to First Order Transition | Robustness of two coupled networks system has been studied only for
dependency coupling (S. Buldyrev et. al., Nature, 2010) and only for
connectivity coupling (E. A. Leicht and R. M. D'Souza, arxiv:09070894). Here we
study, using a percolation approach, a more realistic coupled networks system
where both interdependent... | 1106.4128v1 |
2011-06-22 | Effective axial-vector coupling of gluon as an explanation to the top quark asymmetry | We explore the possibility that the large $t\bar t$ forward-backward
asymmetry measured by the CDF detector at Tevatron could be due to a universal
effective axial-vector coupling of gluon. Using an effective field theory
approach we show model independently how such a log-enhanced coupling occurs at
1-loop level. The ... | 1106.4553v3 |
2011-06-28 | From Strong to Weak Coupling Regime in a Single GaN Microwire up to Room Temperature | Large bandgap semiconductor microwires constitute a very advantageous
alternative to planar microcavities in the context of room temperature strong
coupling regime between exciton and light. In this work we demonstrate that in
a GaN microwire, the strong coupling regime is achieved up to room temperature
with a large R... | 1106.5595v2 |
2011-06-29 | The Top Forward Backward Asymmetry with general Z ' couplings | The measurement of the top forward-backward asymmetry in $\ttbar$ production
measured at the Tevatron shows deviation from the Standard Model prediction. A
$ u \to t$ transition via a flavor changing $Z^{\prime}$ can explain the data.
We show that left handed $t_Lu_LZ^{\prime}$ couplings can be constrained from
$B_{d,s... | 1106.5982v3 |
2011-07-05 | Explaining the t-tbar asymmetry with a light axigluon | We propose an axigluon with mass between 400 and 450 GeV and flavor universal
couplings to quarks to explain the Tevatron t-tbar forward-backward asymmetry.
The model predicts a small negative asymmetry for t-tbar pairs with invariant
mass below 450 GeV and a large positive asymmetry above 450 GeV. The asymmetry
arises... | 1107.0978v2 |
2011-07-08 | Stationary entanglement in strongly coupled qubits | The dynamics of two superconducting flux qubits coupled to each other and to
a common bath is discussed. We focus on the case in which the qubit-qubit
coupling strength dominates over the respective qubit transition frequencies.
We derive the master equation including collective effect by modeling the bath
as 1D open s... | 1107.1587v1 |
2011-07-11 | Dark Matter data and constraints on quartic couplings in IDM | We analyse the thermal evolution of the Universe in the Inert Doublet Model
for three regions of Dark Matter masses: low mass (4-8) GeV, medium mass
(30-80) GeV and high mass (500-1000) GeV. Those three regions of DM mass
exhibit different behaviour, both in the possible types of evolution and in the
energy relic densi... | 1107.1991v1 |
2011-07-21 | Adaptive synchronization in delay-coupled networks of Stuart-Landau oscillators | We consider networks of delay-coupled Stuart-Landau oscillators. In these
systems, the coupling phase has been found to be a crucial control parameter.
By proper choice of this parameter one can switch between different synchronous
oscillatory states of the network. Applying the speed-gradient method, we
derive an adap... | 1107.4197v1 |
2011-07-22 | Large spin-phonon coupling and magnetically-induced phonon anisotropy in Sr$M$O$_3$ perovskites ($M$=V,Cr,Mn,Fe,Co) | First-principles calculations reveal large zone-center spin-phonon coupling
and magnetically-driven phonon anisotropy in cubic perovskites Sr$M$O$_3$
($M$=V,Cr,Mn,Fe,Co). In particular, the frequency and splitting of the polar
Slater mode is found to depend strongly on magnetic ordering. The coupling is
parameterized i... | 1107.4405v1 |
2011-07-25 | Spin-Orbit Coupled Bose-Einstein Condensate under Rotation | We examine the combined effects of Rashba spin-orbit (SO) coupling and
rotation on trapped spinor Bose-Einstein condensates (BECs). Nature of single
particle states is thoroughly examined in the Landau level basis and is shown
to support the formation of half-quantum vortex. In the presence of weak s-wave
interactions,... | 1107.4845v2 |
2011-08-02 | On the Energy Transfer Performance of Mechanical Nanoresonators Coupled with Electromagnetic Fields | We study the energy transfer performance in electrically and magnetically
coupled mechanical nanoresonators. Using the resonant scattering theory, we
show that magnetically coupled resonators can achieve the same energy transfer
performance as for their electrically coupled counterparts, or even outperform
them within ... | 1108.0633v3 |
2011-08-13 | First Principle Study of Magnetism and Magneto-structural Coupling in Gallium Ferrite | We report a first-principles study of the magnetic properties, site disorder
and magneto-structural coupling in multiferroic gallium ferrite (GFO) using
local spin density approximation (LSDA+U) of density functional theory. The
calculations of the ground state A-type antiferromagnetic structure predict
magnetic moment... | 1108.2773v1 |
2011-08-22 | Relaxing the Higgs mass bound in singlet extensions of the MSSM | We show that the upper bound on the lightest Higgs mass in the MSSM is
relaxed by introducing a singlet which couples to the Higgs fields, even at a
large tan beta region, preferable for explaining the muon anomalous magnetic
moment. In the models of a singlet extension, it is known that the upper bound
is relaxed by a... | 1108.4338v2 |
2011-08-25 | Exact dark state solutions of the coupled atomic-molecular Bose-Einstein condensates in an external potential | We consider a coupled nonlinear Schr\"{o}dinger equations describing an
atomic Bose-Einstein condensates coupled to a molecular condensates through the
stimulated Raman adiabatic passage loaded in an external potential. The
existence of dark state are investigated within the full parameter space
accounts for all the no... | 1108.5000v1 |
2011-08-25 | Quantum Langevin equation of a charged oscillator in a magnetic field and coupled to a heat bath through momentum variables | We obtain the quantum Langevin equation (QLE) of a charged quantum particle
moving in a harmonic potential in the presence of a uniform external magnetic
field and linearly coupled to a quantum heat bath through momentum variables.
The bath is modeled as a collection of independent quantum harmonic
oscillators. The QLE... | 1108.5142v2 |
2011-08-26 | Plasmon and coupled plasmon-phonon modes in graphene in the presence of inter-band excitation channels | Plasmon and coupled plasmon-phonon modes in graphene are investigated
the-oretically within the diagrammatic self-consistent field theory. It shows
that two plasmon modes and four coupled plasmon-phonon modes can be excited via
intra-and inter-band transition channels. It is found that with increasing q
and carrier den... | 1108.5265v1 |
2011-09-12 | A general coupled nonlinear oscillator model for event-related (de)synchronization | Changes in the level of synchronization and desynchronization in coupled
oscillator systems due to an external stimulus is called event related
synchronization or desynchronization (ERS/ERD). Such changes occur in real life
systems where the collective activity of the entities of a coupled system is
affected by some ex... | 1109.2422v1 |
2011-09-12 | Inherent Mach-Zehnder interference with "which-way" detection for single particle scattering in one dimension | We study the coherent transport of single photon in a one-dimensional
coupled-resonator-array, "non-locally" coupled to a two-level system. Since its
inherent structure is a Mach-Zehnder interferometer, we explain the destructive
interference phenomenon of the transmission spectrums according to the effect
of which-way... | 1109.2470v1 |
2011-09-13 | Stability of Schwarzschild black hole in f(R) gravity with the dynamical Chern-Simons term | We perform the stability analysis of the Schwarzschild black hole in $f(R)$
gravity with the parity-violating Chern-Simons (CS) term coupled to a dynamical
scalar field $\theta$. For this purpose, we transform the $f(R)$ gravity into
the scalar-tensor theory by introducing a scalaron $\phi$, providing the
dynamical Che... | 1109.2719v2 |
2011-09-13 | Evidence for Interlayer Electronic Coupling in Multilayer Epitaxial Graphene from Polarization Dependent Coherently Controlled Photocurrent Generation | Most experimental studies to date of multilayer epitaxial graphene on C-face
SiC have indicated that the electronic states of different layers are decoupled
as a consequence of rotational stacking. We have measured the third order
nonlinear tensor in epitaxial graphene as a novel approach to probe interlayer
electronic... | 1109.2850v1 |
2011-09-28 | Experimental observation of extreme multistability in an electronic system of two coupled Rössler oscillators | We report the first experimental observation of extreme multistability in a
controlled laboratory investigation. Extreme multistability arises when
infinitely many attractors coexist for the same set of system parameters. The
behavior was predicted earlier on theoretical grounds, supported by numerical
studies of model... | 1109.6267v2 |
2011-09-28 | Interplay between electron-phonon couplings and disorder strength on the transport properties of organic semiconductors | The combined effect of bulk and interface electron-phonon couplings on the
transport properties is investigated in a model for organic semiconductors
gated with polarizable dielectrics. While the bulk electron-phonon interaction
affects the behavior of mobility in the coherent regime below room temperature,
the interfa... | 1109.6342v1 |
2011-10-06 | Long-distance spin-spin coupling via floating gates | The electron spin is a natural two level system that allows a qubit to be
encoded. When localized in a gate defined quantum dot, the electron spin
provides a promising platform for a future functional quantum computer. The
essential ingredient of any quantum computer is entanglement---between electron
spin qubits---com... | 1110.1342v1 |
2011-10-17 | Acoustic phonons mediated non-equilibrium spin current in the presence of Rashba and Dresselhaus spin-orbit couplings | The influence of the electrons interaction with longitudinal acoustic phonons
on magnetoeletric and spin-related transport effects are investigated. The
physical system under consideration has been assumed to be a two dimensional
electron gas system with both Rashba and Dreesselhaus spin-orbit couplings. In
the works w... | 1110.3667v3 |
2011-10-18 | Creation of Matter in the Universe and Groups of Type E7 | We relate the mechanism of matter creation in the universe after inflation to
a simple and universal mathematical property of extended N > 1 supergravities
and related compactifications of superstring theory. We show that in all such
models, the inflaton field may decay into vector fields due to a nonminimal
scalar-vec... | 1110.4048v2 |
2011-10-20 | Holographic non-relativistic fermionic fixed point and bulk dipole coupling | Inspired by the recently discovered non-relativistic fermionic fixed points,
we investigate how the presence of bulk dipole coupling modifies the spectral
function at one of these novel fixed points. As a result, although the infinite
flat band is always visible in the presence of the bulk dipole coupling as well
as ch... | 1110.4559v3 |
2011-10-21 | Spin-orbit-induced strong coupling of a single spin to a nanomechanical resonator | We theoretically investigate the deflection-induced coupling of an electron
spin to vibrational motion due to spin-orbit coupling in suspended carbon
nanotube quantum dots. Our estimates indicate that, with current capabilities,
a quantum dot with an odd number of electrons can serve as a realization of the
Jaynes-Cumm... | 1110.4893v2 |
2011-10-25 | An Argument for Nonminimal Higgs Coupling to Gravity | The coupling of gravity to a scalar field raises a number of interesting
questions of principle since the usual minimal coupling obtained by replacing
ordinary derivatives with covariant derivatives is not available -- they are
the same operation on scalar fields. Conformal couplings in the Lagrangian
proportional to $... | 1110.5549v1 |
2011-10-25 | Light Custodians and Higgs Physics in Composite Models | Composite Higgs models involving partial compositeness of Standard Model
fermions typically require the introduction of fermionic partners which are
relatively light in realistic scenarios. In this paper, we analyze the role of
these light custodian fermions in the phenomenology of the composite Higgs
models and show t... | 1110.5646v2 |
2011-12-01 | Axial Anomaly, Mismatched Fermi Surfaces and Vector Interaction in Dense Neutral Quark Matter | We report on effects of the q-$\bar{\rm q}$ vector interaction and/or the
U(1)$_A$-anomaly-induced chiral-diquark coupling on the charge-neutral quark
matter in $\beta$-equilibrium. We show that when the vector coupling is absent,
there can appear a cross-over region sandwiched by two critical points in the
intermediat... | 1112.0075v2 |
2011-12-06 | Radiative coupling and weak lasing of exciton-polariton condensates | In spite of having finite life-time exciton-polaritons in microcavities are
known to condense at strong enough pumping of the reservoir. We present an
analytical theory of such Bose-condensates on a set of localized one-particle
states: condensation centers. To understand physics of these arrays one has to
supplement t... | 1112.1399v2 |
2011-12-12 | Solving non-Markovian open quantum systems with multi-channel reservoir coupling | We extend the non-Markovian quantum state diffusion (QSD) equation to open
quantum systems which exhibit multi-channel coupling to a harmonic oscillator
reservoir. Open quantum systems which have multi-channel reservoir coupling are
those in which canonical transformation of reservoir modes cannot reduce the
number of ... | 1112.2716v1 |
2011-12-13 | Critical temperature of a Rashba spin-orbit coupled Bose gas in harmonic traps | We investigate theoretically Bose-Einstein condensation of an ideal, trapped
Bose gas in the presence of Rashba spin-orbit coupling. Analytic results for
the critical temperature and condensate fraction are derived, based on a
semi-classical approximation to the single-particle energy spectrum and density
of states, an... | 1112.2799v2 |
2011-12-14 | Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides | We show that inversion symmetry breaking together with spin-orbit coupling
leads to coupled spin and valley physics in monolayers of MoS2 and other
group-VI dichalcogenides, making possible controls of spin and valley in these
2D materials. The spin-valley coupling at the valence band edges suppresses
spin and valley r... | 1112.3144v3 |
2011-12-19 | Exploiting boundary states of imperfect spin chains for high-fidelity state transfer | We study transfer of a quantum state through XX spin chains with static
imperfections. We combine the two standard approaches for state transfer based
on (i) modulated couplings between neighboring spins throughout the spin chain
and (ii) weak coupling of the outermost spins to an unmodulated spin chain. The
combined a... | 1112.4503v2 |
2011-12-23 | Observation of scalar nuclear spin-spin coupling in van der Waals molecules | Scalar couplings between covalently bound nuclear spins are a ubiquitous
feature in nuclear magnetic resonance (NMR) experiments, imparting valuable
information to NMR spectra regarding molecular structure and conformation. Such
couplings arise due to a second-order hyperfine interaction, and, in principle,
the same me... | 1112.5644v1 |
2012-02-09 | Spin-orbit coupling induced fractionalized Skyrmion excitations in rotating and rapidly quenched spin-1 Bose-Einstein condensates | We investigate the fractionalized Skyrmion excitations induced by spin-orbit
coupling in rotating and rapidly quenched spin-1 Bose-Einstein condensates. Our
results show that the fractionalized Skyrmion excitation depends on the
combination of spin-orbit coupling and rotation, and it originates from a
dipole structure ... | 1202.1911v3 |
2012-02-14 | Noise Correlations and Coherent Coupling in Solid-State Qubits | This thesis is devoted to the study of quantum mechanical effects that arise
in systems of reduced dimensionality. Specifically, we investigate coherence
and correlation effects in quantum transport models. In the first part, we
present a theory of Markovian and non- Markovian current correlations in
nanoscopic conduct... | 1202.3161v1 |
2012-02-17 | Competition of different coupling schemes in atomic nuclei | Shell model calculations reveal that the ground and low-lying yrast states of
the $N=Z$ nuclei $^{92}_{46}$Pd and $^{96}$Cd are mainly built upon isoscalar
spin-aligned neutron-proton pairs each carrying the maximum angular momentum
J=9 allowed by the shell $0g_{9/2}$ which is dominant in this nuclear region.
This mode... | 1202.3918v1 |
2012-02-22 | Lossy Source Coding via Spatially Coupled LDGM Ensembles | We study a new encoding scheme for lossy source compression based on
spatially coupled low-density generator-matrix codes. We develop a
belief-propagation guided-decimation algorithm, and show that this algorithm
allows to approach the optimal distortion of spatially coupled ensembles.
Moreover, using the survey propag... | 1202.4959v1 |
2012-02-23 | Photon-assisted entanglement creation by minimum-error generalized quantum measurements in the strong coupling regime | We explore possibilities of entangling two distant material qubits with the
help of an optical radiation field in the regime of strong quantum
electrodynamical coupling with almost resonant interaction. For this purpose
the optimum generalized field measurements are determined which are capable of
preparing a two-qubit... | 1202.5192v2 |
2012-02-29 | Coherence transition in degenerate diffusion equations with mean field coupling | We introduce non-linear diffusion in a classical diffusion advection model
with non local aggregative coupling on the circle, that exhibits a transition
from an uncoherent state to a coherent one when the coupling strength is
increased. We show first that all solutions of the equation converge to the set
of equilibria,... | 1202.6521v1 |
2012-03-01 | Pionic couplings to the lowest heavy-light mesons of positive and negative parity | We present the method and compute the strong couplings of the lowest and
first orbitally excited heavy-light mesons to a soft pion in the static heavy
quark limit on the lattice. Besides the usual g^ and \~g couplings, we were
able to make the first computation of the coupling h using the relevant radial
distributions.... | 1203.0167v1 |
2012-03-02 | Magnetic Interaction between Surface Engineered Rare-earth Atomic Spins | We report the ab initio study of rare-earth adatoms (Gd) on an insulating
surface. This surface is of interest because of previous studies by scanning
tunneling microscopy showing spin excitations of transition metal adatoms. The
present work is the first study of rare-earth spin-coupled adatoms, as well as
the geometr... | 1203.0418v1 |
2012-03-08 | Nonequilibrium phases in hybrid arrays with flux qubits and NV centers | We propose a startling hybrid quantum architecture for simulating a
localization-delocalization transition. The concept is based on an array of
superconducting flux qubits which are coupled to a diamond crystal containing
nitrogen-vacancy (NV) centers. The underlying description is a
Jaynes-Cummings-lattice in the stro... | 1203.1857v2 |
2012-03-22 | Cluster and group synchronization in delay-coupled networks | We investigate the stability of synchronized states in delay-coupled networks
where synchronization takes place in groups of different local dynamics or in
cluster states in networks with identical local dynamics. Using a master
stability approach, we find that the master stability function shows a discrete
rotational ... | 1203.4916v2 |
2012-03-22 | Constraints on the Universal Varying Yukawa Couplings: from SM-like to Fermiophobic | Varying the Standard Model (SM) fermion Yukawa couplings universally by a
generic positive scale factor ($F_{Yu}$), we study the phenomenological fit to
the current available experimental results for the Higgs boson search at hadron
colliders. We point out that the Higgs production cross section and its decay
branching... | 1203.5083v3 |
2012-03-28 | Nonperturbative master equation solution of central spin dephasing dynamics | We solve the long-standing central spin problem for a general set of
inhomogeneous bath couplings and a large class of initial bath states. We
compute the time evolution of the coherence of a central spin coupled to a spin
bath by resumming all orders of the time-convolutionless master equation, thus
avoiding the need ... | 1203.6355v2 |
2012-06-05 | Photon Blockade in the Ultrastrong Coupling Regime | We explore photon coincidence counting statistics in the ultrastrong-coupling
regime where the atom-cavity coupling rate becomes comparable to the cavity
resonance frequency. In this regime usual normal order correlation functions
fail to describe the output photon statistics. By expressing the electric-field
operator ... | 1206.0944v2 |
2012-06-08 | Probing Color Octet Couplings at the Large Hadron Collider | Color-octet resonances arise in many well motivated theories beyond the
standard model. As colored objects they are produced copiously at the LHC and
can be discovered in early searches for new physics in dijet final states. Once
they are discovered it will be important to measure the couplings of the new
resonances to... | 1206.1661v2 |
2012-06-08 | Shining Light on Modifications of Gravity | Many modifications of gravity introduce new scalar degrees of freedom, and in
such theories matter fields typically couple to an effective metric that
depends on both the true metric of spacetime and on the scalar field and its
derivatives. Scalar field contributions to the effective metric can be
classified as conform... | 1206.1809v2 |
2012-06-14 | Controllable exchange coupling between two singlet-triplet qubits | We study controllable exchange coupling between two singlet-triplet qubits.
We start from the original second quantized Hamiltonian of a quadruple quantum
dot system and obtain the effective spin-spin interaction between the two
qubits using the projection operator method. Under a strong uniform external
magnetic field... | 1206.3112v4 |
2012-06-13 | Phantom Divide Crossing with General Non-minimal Kinetic Coupling | We propose a model of dark energy consists of a single scalar field with a
general non-minimal kinetic couplings to itself and to the curvature. We study
the cosmological dynamics of the equation of state in this setup. The coupling
terms have the form $\xi_{1} R f(\phi)\partial_{\mu}\phi\partial^{\mu}\phi$ and
$\xi_{2... | 1206.3299v1 |
2012-06-25 | Strong coupling between mechanical modes in a nanotube resonator | We report on the nonlinear coupling between the mechanical modes of a
nanotube resonator. The coupling is revealed in a pump-probe experiment where a
mode driven by a pump force is shown to modify the motion of a second mode
measured with a probe force. In a second series of experiments, we actuate the
resonator with o... | 1206.5610v1 |
2012-07-06 | Global Analysis of the Higgs Candidate with Mass ~ 125 GeV | We analyze the properties of the Higgs candidate with mass ~ 125 GeV
discovered by the CMS and ATLAS Collaborations, constraining the possible
deviations of its couplings from those of a Standard Model Higgs boson. The
CMS, ATLAS and Tevatron data are compatible with Standard Model couplings to
massive gauge bosons and... | 1207.1693v2 |
2012-07-20 | Slot-mode-coupled optomechanical crystals | We present a design methodology and analysis of a cavity optomechanical
system in which a localized GHz frequency mechanical mode of a nanobeam
resonator is evanescently coupled to a high quality factor (Q>10^6) optical
mode of a separate nanobeam optical cavity. Using separate nanobeams provides
flexibility, enabling ... | 1207.5020v1 |
2012-07-26 | Thermodynamics and phase diagram of anisotropic Chern-Simons deformed gauge theories | We consider 3+1-dimensional gauge theories at finite temperature and a finite
density of charges which couple to a 2+1-dimensional Chern-Simons operator,
giving rise to a theta-term with constant spatial gradient of theta. The
strong-coupling limit of thermal N=4 super-Yang-Mills theory with this kind of
anisotropic de... | 1207.6283v2 |
2012-07-27 | Nonequilibrium Multi-Band Spin Quantum Transport Equations: Spin, Pseudo-Spin, and Total Charge Coupling | Using the superfield nonequilibrium Greens function technique, we derive the
spatio-temporal spin magnetization quantum transport equations (SMQTEs) for a
two-band model of semiconductors. The relevant variables are the real
(Pauli-Dirac) spin, pseudo-spin, and the total charge. The results show that
the multi-band rea... | 1207.6647v1 |
2012-07-31 | Mass anomalous dimension from Dirac eigenmode scaling in conformal and confining systems | The mode number of the Dirac operator scales with an exponent related to the
mass anomalous dimension gamma_m. This relation holds both in IR-conformal
systems, as well as in confining systems for large enough eigenvalues. We
investigate the Nf=4, 8 and 12 flavor SU(3) systems at several couplings near
the chiral limit... | 1207.7162v1 |
2012-08-03 | Optical nonlinearity for few-photon pulses on a quantum dot-pillar cavity device | Giant optical nonlinearity is observed under both continuous-wave and pulsed
excitation in a deterministically-coupled quantum dot-micropillar system, in a
pronounced strong-coupling regime. Using absolute reflectivity measurements we
determine the critical intracavity photon number as well as the input and
output coup... | 1208.0850v1 |
2012-08-05 | The Yang-Mills gradient flow in finite volume | The Yang-Mills gradient flow is considered on the four dimensional torus T^4
for SU(N) gauge theory coupled to N_f flavors of massless fermions in arbitrary
representations. The small volume dynamics is dominated by the constant gauge
fields. The expectation value of the field strength tensor squared is
calculated for ... | 1208.1051v2 |
2012-08-08 | Accretion of non-minimally coupled generalized Chaplygin gas into black holes | The mass evolution of Schwarzschild black holes by the absorption of scalar
fields is investigated in the scenario of the generalized Chaplygin gas (GCG).
The GCG works as a unification picture of dark matter plus dark energy that
naturally accelerates the expansion of the Universe. Through elements of the
quasi-statio... | 1208.1572v1 |
2012-08-15 | Electrical modulation of the edge channel transport in topological insulators coupled to ferromagnetic leads | The counterpropagating edge states of a two-dimensional topological insulator
(TI) carry electrons of opposite spins. We investigate the transport properties
of edge states in a two-dimensional TI which is contacted to ferromagnetic
leads. The application of a side-gate voltage induces a constriction or quantum
point c... | 1208.3031v1 |
2012-08-20 | A Simple Proof of Threshold Saturation for Coupled Vector Recursions | Convolutional low-density parity-check (LDPC) codes (or spatially-coupled
codes) have now been shown to achieve capacity on binary-input memoryless
symmetric channels. The principle behind this surprising result is the
threshold-saturation phenomenon, which is defined by the belief-propagation
threshold of the spatiall... | 1208.4080v3 |
2012-08-23 | Coupling of fermionic fields with mass dimensions one to the O'Raifeartaigh model | The objective of this article is to discuss the coupling of fermionic fields
with mass dimension one to the O'Raifeartaigh model to study supersymmetry
breaking for fermionic fields with mass dimension one.
We find that the coupled model has two distinct solutions. The first solution
represents a local minimum of the... | 1208.4674v1 |
2012-08-26 | Dissipation and detection of polaritons in ultrastrong coupling regime | We have investigated theoretically a dissipative polariton system in the
ultrastrong light-matter coupling regime without using the rotating-wave
approximation on system-reservoir coupling. Photons in a cavity and excitations
in matter respectively couple two large ensembles of harmonic oscillators
(photonic and excito... | 1208.5181v1 |
2012-08-29 | Optically mediated nonlinear quantum optomechanics | We consider theoretically the optomechanical interaction of several
mechanical modes with a single quantized cavity field mode for linear and
quadratic coupling. We focus specifically on situations where the optical
dissipation is the dominant source of damping, in which case the optical field
can be adiabatically elim... | 1208.5821v1 |
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