publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2016-12-16 | Scheme variations of the QCD coupling and tau decays | The QCD coupling, $\alpha_s$, is not a physical observable since it depends
on conventions related to the renormalization procedure. Here we discuss a
redefinition of the coupling where changes of scheme are parametrised by a
single parameter $C$. The new coupling is denoted $\hat \alpha_s$ and its
running is scheme in... | 1612.05558v1 |
2016-12-20 | The mean field analysis for the Kuramoto model on graphs I. The mean field equation and transition point formulas | In his classical work on synchronization, Kuramoto derived the formula for
the critical value of the coupling strength corresponding to the transition to
synchrony in large ensembles of all-to-all coupled phase oscillators with
randomly distributed intrinsic frequencies. We extend the Kuramoto's result to
a large class... | 1612.06493v1 |
2016-12-20 | Time evolution of coupled spin systems in a generalized Wigner representation | Phase-space representations as given by Wigner functions are a powerful tool
for representing the quantum state and characterizing its time evolution in the
case of infinite-dimensional quantum systems and have been widely used in
quantum optics and beyond. Continuous phase spaces have also been studied for
finite-dime... | 1612.06777v2 |
2016-12-29 | Ultrastrong-coupling quantum-phase-transition phenomena in a few-qubit circuit QED system | We study ultrastrong-coupling quantum-phase-transition phenomena in a
few-qubit system. In the one-qubit case, three second-order transitions occur
and the Goldstone mode emerges under the condition of ultrastrong-coupling
strength. Moreover, a first-order phase transition occurs between two different
superradiant phas... | 1612.09119v2 |
2016-12-30 | Impurity-Induced Environmental Quantum Phase Transitions in the Quadratic-Coupling Spin-Boson Model | We study the zero temperature properties of the sub-Ohmic spin-boson model
with quadratic spin-boson coupling. This model describes experimental set ups
at the optimal working point where the linear-coupling between the qubit (spin)
and the environmental noise (bosons) is zero and the leading coupling is
quadratic. In ... | 1612.09437v2 |
2017-07-05 | Universal stabilization of a parametrically coupled qubit | We autonomously stabilize arbitrary states of a qubit through parametric
modulation of the coupling between a fixed frequency qubit and resonator. The
coupling modulation is achieved with a tunable coupler design, in which the
qubit and the resonator are connected in parallel to a superconducting quantum
interference d... | 1707.01491v1 |
2017-07-10 | Strong 4-mode coupling of nanomechanical string resonators | We investigate mechanical mode coupling between the four fundamental flexural
modes of two doubly-clamped, high-Q silicon-nitride nanomechanical string
resonators. Strong mechanical coupling between the strings is induced by the
strain mediated via a shared clamping point, engineered to increase the
exchange of oscilla... | 1707.02926v3 |
2017-07-13 | Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension | Using the Density Matrix Renormalization Group technique we study the effect
of spin-orbit coupling on a three-orbital Hubbard model in the $(t_{2g})^{4}$
sector and in one dimension. Fixing the Hund coupling to a robust value
compatible with some multiorbital materials, we present the phase diagram
varying the Hubbard... | 1707.04313v1 |
2017-07-19 | Coupled DM heating in SCDEW cosmologies | Strongly Coupled Dark Energy plus Warm dark matter (SCDEW) cosmologies admit
the stationary presence of $\sim 1\, \%$ of coupled-DM and DE, since
inflationary reheating. Coupled-DM fluctuations therefore grow up to
non-linearity even in the early radiative expansion. Such early non-linear
stages are modelized here thro... | 1707.06004v2 |
2017-07-21 | Exact Cancellation of Emittance Due to Coupled Transverse Dynamics in Solenoids and RF Couplers | Small, stray magnetic and RF fields in electron guns and injectors can
perturb an electron beam and introduce correlations between the otherwise
orthogonal transverse trajectories. These correlations couple the x and y
dynamics which increases the transverse emittance. If the correlation becomes
"diluted" or randomized... | 1707.07015v1 |
2017-11-01 | Negative differential thermal conductance and heat amplification in a nonequilibrium triangle-coupled spin-boson system at strong coupling | We investigate the nonequilibrium quantum heat transfer in a triangle-coupled
spin-boson system within a three-terminal setup. By including the
nonequilibrium noninteracting blip approximation approach combined with the
full counting statistics, we analytically obtain the steady state populations
and heat currents. The... | 1711.00204v1 |
2017-11-03 | Coupling of nanoparticle dynamics to polymer center-of-mass motion in semidilute polymer solutions | We investigate the dynamics of nanoparticles in semidilute polymer solutions
when the nanoparticles are comparably sized to the polymer coils using
explicit- and implicit-solvent simulation methods. The nanoparticle dynamics
are subdiffusive on short time scales before transitioning to diffusive motion
on long time sca... | 1711.01014v3 |
2017-11-05 | Multi-mode superconducting circuits for realizing strongly coupled multi-qubit processor units | Inter-qubit coupling and qubit connectivity in a processor are crucial for
achieving high fidelity multi-qubit gates and efficient implementation of
quantum algorithms. Typical superconducting processors employ relatively weak
transverse inter-qubit coupling which are activated via frequency tuning or
microwave drives.... | 1711.01658v3 |
2017-11-06 | Coherent spin-qubit photon coupling | Electron spins hold great promise for quantum computation due to their long
coherence times. An approach to realize interactions between distant
spin-qubits is to use photons as carriers of quantum information. We
demonstrate strong coupling between single microwave photons in a NbTiN high
impedance cavity and a three-... | 1711.01932v1 |
2017-11-06 | Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits | In addition to magnetic field and electric charge noise adversely affecting
spin qubit operations, performing single-qubit gates on one of multiple coupled
singlet-triplet qubits presents a new challenge---crosstalk, which is
inevitable (and must be minimized) in any multiqubit quantum computing
architecture. We develo... | 1711.02092v2 |
2017-11-07 | Spin-Orbit Coupling and Magnetic Anisotropy in Iron-Based Superconductors | We determine theoretically the effect of spin-orbit coupling on the magnetic
excitation spectrum of itinerant multi-orbital systems, with specific
application to iron-based superconductors. Our microscopic model includes a
realistic ten-band kinetic Hamiltonian, atomic spin-orbit coupling, and
multi-orbital Hubbard int... | 1711.02460v1 |
2017-11-16 | Yu-Shiba-Rusinov screening of spins in double quantum dots | A magnetic impurity coupled to a superconductor gives rise to a
Yu-Shiba-Rusinov (YSR) state inside the superconducting energy gap. With
increasing exchange coupling the excitation energy of this state eventually
crosses zero and the system switches to a YSR groundstate with bound
quasiparticles screening the impurity ... | 1711.06081v1 |
2017-11-17 | Enhancement of Electromagnetically Induced Transparency in Metamaterials Using Long Range Coupling Mediated by a Hyperbolic Material | Near-field coupling is a fundamental physical effect, which plays an
important role in the establishment of classical analog of electromagnetically
induced transparency (EIT). However, in a normal environment the coupling
length between the bright and dark artificial atoms is very short and far less
than one wavelength... | 1711.06522v2 |
2017-11-18 | Topological edge states and pumping in a chain of coupled superconducting qubits | Topological insulators have inspired the study with various quantum
simulators. Exploiting the tunability of the qubit frequency and qubit-qubit
coupling, we show that a superconducting qubit chain can simulate various
topological band models. When the system is restricted to the single-spin
excitation subspace, the Su... | 1711.06829v1 |
2017-11-23 | Herring-Flicker coupling and thermal quantum correlations in bipartite system | In this letter we study thermal quantum correlations as quantum discord and
entanglement in bipartite system imposed by external magnetic field with
Herring-Flicker coupling ie. $J(R)=1.642 e^{-2 R} R^{5/2}+O(R^{2}e^{-2R})$. The
Herring-Flicker coupling strength is the function of $R$, which is the distance
between spi... | 1711.08620v3 |
2017-11-27 | Reaching the optomechanical strong coupling regime with a single atom in a cavity | A major goal within the field of optomechanics is to achieve the
single-photon strong coupling regime, wherein even a mechanical displacement as
small as the zero-point uncertainty is enough to shift an optical cavity
resonance by more than its linewidth. This goal is difficult, however, due to
the small zero-point mot... | 1711.09619v2 |
2017-11-29 | Production of gravitational waves during preheating with nonminimal coupling | We study the preheating and the in-process production of gravitational waves
(GWs) after inflation in which the inflaton is nonminimally coupled to the
curvature in a self-interacting quartic potential with the method of lattice
simulation. We find that the nonminimal coupling enhances the amplitude of the
density spec... | 1711.10888v3 |
2018-10-10 | Collective modes of two-dimensional classical Coulomb fluids | Molecular dynamics simulations have been performed to investigate in detail
collective modes spectra of two-dimensional Coulomb fluids in a wide range of
coupling. The obtained dispersion relations are compared with theoretical
approaches based on quasi-crystalline approximation (QCA), also known as the
quasi-localized... | 1810.04435v1 |
2018-10-13 | Dynamical properties of the finite-size Dicke model coupled to a thermal reservoir | We investigate the dynamical properties of the finite-size Dicke model
coupled to a photon reservoir in the dispersive regime. The system-reservoir
coupling in our Hamiltonian includes counter-rotating terms, which are relevant
in the strong atom-cavity coupling. Because the dispersive regime is
considered, the dynamic... | 1810.05888v1 |
2018-10-22 | Dynamics of a quantum oscillator coupled with a three-level Lambda-type emitter | We investigate the quantum dynamics of a quantum oscillator coupled with the
most upper state of a three-level $\Lambda-$ type system. The two transitions
of the three-level emitter, possessing orthogonal dipole moments, are
coherently pumped with a single or two electromagnetic field sources,
respectively. We have fou... | 1810.09264v2 |
2018-10-22 | Matching renormalisable couplings: simple schemes and a plot | We discuss different choices that can be made when matching a general
high-energy theory -- with the restriction that it should not contain heavy
gauge bosons -- onto a general renormalisable effective field theory at one
loop, with particular attention to the quartic scalar couplings and Yukawa
couplings. This include... | 1810.09388v2 |
2018-10-27 | Anomalous triple gauge boson couplings in $ZZ$ production at the LHC and the role of $Z$ boson polarizations | We study anomalous couplings among neutral gauge bosons in $ZZ$ production at
the LHC for $\sqrt{s}=13$ TeV in $4$-lepton final state. We use the cross
section and polarization asymmetries of the $Z$ boson to estimate simultaneous
limits on anomalous coupling using Markov-Chain--Monte-Carlo (MCMC) method for
luminositi... | 1810.11657v3 |
2018-10-30 | Top-bottom-tau Yukawa coupling unification in the MSSM+1VF and fermion masses as IR fixed points | In the MSSM extended by a complete vectorlike family, precise top, bottom and
tau Yukawa coupling unification can be achieved assuming SUSY threshold
corrections which are typical for comparable superpartner masses. Furthermore,
the unification is possible with a large unified coupling, implying that all
three fermion ... | 1810.12474v2 |
2018-10-31 | Minimal Surfaces and Generalized Einstein-Maxwell-dilaton Theory | We present novel classes of non-stationary solutions to the five-dimensional
generalized Einstein-Maxwell-dilaton theory with cosmological constant, in
which the Maxwell's filed and the cosmological constant couple to the dilaton
field. In the first class of solutions, the two non-zero coupling constants are
different ... | 1810.13051v2 |
2019-05-02 | Subradiance dynamics in a singly-excited chiral-coupled atomic chain | We theoretically investigate the subradiance dynamics in a nonreciprocal
chiral-coupled atomic chain, in which infinite-range dipole-dipole interaction
emerges in the dissipation. We find that super- and subradiance are both
present in the dissipation process following single photon excitation, and the
decay dynamics s... | 1905.00558v2 |
2019-05-03 | Mott polaritons in cavity-coupled quantum materials | We show that strong electron-electron interactions in cavity-coupled quantum
materials can enable collectively enhanced light-matter interactions with
ultrastrong effective coupling strengths. As a paradigmatic example we consider
a Fermi-Hubbard model coupled to a single-mode cavity and find that resonant
electron-cav... | 1905.02044v1 |
2019-05-14 | The Dark Matter Phonon Coupling | Generically, the effective coupling between the dark matter and an atom
scales with the number of constituents in the atom, resulting in the effective
coupling being proportional to the mass of the atom. In this limit, when the
momentum transfer is also small, we show that the leading term in the
scattering of a partic... | 1905.05575v2 |
2019-05-15 | Hybrid plasmonic waveguide coupling of photons from a single molecule | We demonstrate the emission of photons from a single molecule into a hybrid
gap plasmon waveguide (HGPW). Crystals of anthracene, doped with
dibenzoterrylene (DBT), are grown on top of the waveguides. We investigate a
single DBT molecule coupled to the plasmonic region of one of the guides, and
determine its in-plane o... | 1905.06321v1 |
2019-05-17 | Observation of Multimode Strong Coupling of Cold Atoms to a 30-m Long Optical Resonator | We report on the observation of multimode strong coupling of a small ensemble
of atoms interacting with the field of a 30-m long fiber resonator containing a
nanofiber section. The collective light--matter coupling strength exceeds the
free spectral range and the atoms couple to consecutive longitudinal resonator
modes... | 1905.07353v1 |
2019-05-21 | Effective Spin-2 Quasi-particles at Linear Dispersive Five-fold Degenerate Points with Tunable Topological Chern Numbers | In this work, which is based on spin-2 vectors and traceless spin-2 tensors,
an effective Hamiltonian is constructed with a linearly dispersive five-fold
degenerate point with spin-2 vector-momentum couplings. For the model without
spin-2 vector-tensor coupling, the topological Chern numbers of five bands are
calculate... | 1905.08435v1 |
2019-05-21 | Induced spin-orbit coupling in twisted graphene-TMDC heterobilayers: twistronics meets spintronics | We propose an interband tunneling picture to explain and predict the
interlayer twist angle dependence of the induced spin-orbit coupling in
heterostructures of graphene and monolayer transition metal dichalcogenides
(TMDCs). We obtain a compact analytic formula for the induced valley Zeeman and
Rashba spin-orbit coupl... | 1905.08688v1 |
2019-05-27 | On the impact of Majorana masses in gravity-matter systems | We investigate the Higgs-Yukawa system with Majorana masses of a fermion
within asymptotically safe quantum gravity. Using the functional
renormalization group method we derive the beta functions of the Majorana
masses and the Yukawa coupling constant and discuss the possibility of a
non-trivial fixed point for the Yuk... | 1905.11114v2 |
2019-05-29 | Entanglement and quantum discord in optically coupled coherent Ising machines | We present analytical and numerical simulation results for squeezing,
entanglement, and quantum discord in a dissipatively coupled coherent Ising
machine (CIM). Both analytical solutions and numerical simulation results,
which are obtained with positive-P, truncated-Wigner and truncated-Husimi
representations for the d... | 1905.12348v2 |
2019-05-29 | Higgs Parity Grand Unification | The vanishing of the Higgs quartic coupling of the Standard Model at high
energies may be explained by spontaneous breaking of Higgs Parity. Taking Higgs
Parity to originate from the Left-Right symmetry of the $SO(10)$ gauge group,
leads to a new scheme for precision gauge coupling unification that is
consistent with p... | 1905.12722v1 |
2019-05-31 | Aspects of wave turbulence in preheating II: Rebirth of the nonminimal coupled models | We study the nonlinear stage of preheating in a model consisting of a single
inflaton field $\phi$ nonminimally coupled to the spacetime curvature and
considering a self-coupling quartic potential V ($\phi$) = $\lambda \phi^4/4$.
As the first motivation, we mention that this nonminimally coupled model agrees
with the o... | 1905.13647v1 |
2020-05-30 | Complex Sequential Understanding through the Awareness of Spatial and Temporal Concepts | Understanding sequential information is a fundamental task for artificial
intelligence. Current neural networks attempt to learn spatial and temporal
information as a whole, limited their abilities to represent large scale
spatial representations over long-range sequences. Here, we introduce a new
modeling strategy cal... | 2006.00212v1 |
2020-06-14 | Efficient Approximate Minimum Entropy Coupling of Multiple Probability Distributions | Given a collection of probability distributions $p_{1},\ldots,p_{m}$, the
minimum entropy coupling is the coupling $X_{1},\ldots,X_{m}$ ($X_{i}\sim
p_{i}$) with the smallest entropy $H(X_{1},\ldots,X_{m})$. While this problem
is known to be NP-hard, we present an efficient algorithm for computing a
coupling with entrop... | 2006.07955v2 |
2020-06-16 | Generating Giant Vortex in a Fermi Superfluid via Spin-Orbital-Angular-Momentum Coupling | Spin-orbital-angular-momentum (SOAM) coupling has been realized in recent
experiments of Bose-Einstein condensates [Chen et al., Phys. Rev. Lett. 121,
113204 (2018) and Zhang et al., Phys. Rev. Lett. 122, 110402 (2019)], where the
orbital angular momentum imprinted upon bosons leads to quantized vortices. For
fermions,... | 2006.08898v2 |
2020-06-16 | Multipole analysis of substrate-supported dielectric nanoresonator arrays with T-matrix method | Substrates, and layered media in general, are ubiquitous, affect the
properties of whatever is in their vicinity, and their influence is, in an
arbitrary framework, challenging to quantify analytically, especially for large
arrays which escape explicit numerical treatment due to the computational
burden. In this work, ... | 2006.09137v1 |
2020-06-20 | Tunable magnon-magnon coupling in synthetic antiferromagnets | In this work, we study magnon-magnon coupling in synthetic antiferromagnets
(SyAFs) using microwave spectroscopy at room temperature. Two distinct
spin-wave modes are clearly observed and are hybridised at degeneracy points.
We provide a phenomenological model that captures the coupling phenomena and
experimentally dem... | 2006.11633v2 |
2020-06-21 | Forces and Torques Near to Impact in the Golf Swing | Motivated by MacKenzie's observation of a negative force couple near to
impact, this paper explores a model for how the golf club moves near to impact.
It assumes the golf club is moving as the distal arm of a double pendulum. At
impact the club head is moving straight down the target line, at its maximum
speed, on a p... | 2006.11778v1 |
2020-06-22 | Effective coupling conditions for arbitrary flows in Stokes-Darcy systems | Boundary conditions at the interface between the free-flow region and the
adjacent porous medium is a key issue for physically consistent modeling and
accurate numerical simulation of flow and transport processes in coupled
systems due to the interface driven nature of such processes. Interface
conditions available in ... | 2006.12096v1 |
2020-06-24 | Optimal storage time for $N$ qubits coupled to a one-dimensional waveguide | Symmetry-protected subradiance is known to guarantee high qubit storage times
in free space. We show that in one-dimensional waveguides, this is also true,
but that even longer qubit storage times can be identified by considering the
eigenspectrum of the qubit-qubit coupling matrix. In the process, we introduce
three t... | 2006.14020v1 |
2020-06-27 | A Comprehensible Review: Magnonic Magnetoelectric Coupling in Ferroelectric/ Ferromagnetic Composites | Composite materials consisting of coupled magnetic and ferroelectric layers
hold the promise for new emergent properties such as controlling magnetism with
electric fields. Obviously, the interfacial coupling mechanism plays a crucial
role and its understanding is the key for exploiting this material class for
technolo... | 2006.15290v2 |
2020-09-02 | Perfect coherent transfer in an on-chip reconfigurable nanoelectromechanical network | Realizing a controllable network with multiple degrees of interaction is a
challenge to physics and engineering. Here, we experimentally report an on-chip
reconfigurable network based on nanoelectromechanical resonators with
nearest-neighbor (NN) and next-nearest-neighbor (NNN) strong couplings. By
applying different p... | 2009.00798v2 |
2020-09-03 | Quantum Zeno effects across a parity-time symmetry breaking transition in atomic momentum space | We experimentally study quantum Zeno effects in a parity-time (PT) symmetric
cold atom gas periodically coupled to a reservoir. Based on the
state-of-the-art control of inter-site couplings of atoms in a momentum
lattice, we implement a synthetic two-level system with passive PT symmetry
over two lattice sites, where a... | 2009.01419v1 |
2020-09-04 | Spectroscopy and critical quantum thermometry in the ultrastrong coupling regime | We present an exact analytical solution of the anisotropic Hopfield model,
and we use it to investigate in detail the spectral and thermometric response
of two ultrastrongly coupled quantum systems. Interestingly, we show that
depending on the initial state of the coupled system, the vacuum Rabi splitting
manifests sig... | 2009.01994v2 |
2020-09-09 | Effect of dipolar interactions on cavity magnon-polaritons | The strong photon-magnon coupling between an electromagnetic cavity and two
yttrium iron garnet (YIG) spheres has been investigated in the context of a
strong mutual dipolar interaction between the spheres. A decrease in the
coupling strength between the YIG spheres and the electromagnetic cavity is
observed, along wit... | 2009.04557v1 |
2020-09-15 | Lattice N=4 super Yang-Mills at Strong Coupling | In this paper we present results from numerical simulations of N=4 super
Yang-Mills for two color gauge theory over a wide range of 't Hooft coupling
$0<\lambda\le 30$ using a supersymmetric lattice action
\cite{Catterall:2009it}. Numerical study of this lattice theory has been
stymied until recently by both sign probl... | 2009.07334v2 |
2020-09-19 | Koopman analysis in oscillator synchronization | Synchronization is an important dynamical phenomenon in coupled nonlinear
systems, which has been studied extensively in recent years. However, analysis
focused on individual orbits seems hard to extend to complex systems while a
global statistical approach is overly cursory. Koopman operator technique seems
to well ba... | 2009.09227v1 |
2020-09-26 | Holograhic two-currents model with coupling and its conductivites | We implement a holographic gravity model of two gauge fields with a coupling
between them, which is dual to a two-currents model. An analytical black brane
solution is obtained. In particular, we work out the expressions of
conductivities with coupling and find that the expressions of conductivities
are directly relate... | 2009.12556v1 |
2020-09-30 | Rashba coupling and spin switching through surface states of Dirac semimetals | We study the effect of the Rashba spin-orbit coupling on the Fermi arcs of
topological Dirac semimetals. The Rashba coupling is induced by breaking the
inversion symmetry at the surface. Remarkably, this coupling could be enhanced
by the interaction with the substrate and controlled by an external electric
field. We st... | 2009.14753v2 |
2021-02-09 | Axion induced spin effective couplings | Detecting axionic dark matter induced electron or nucleon oscillating
electric dipole moment (OEDM) has become a new way for dark matter searches. We
re-examine such axion-spin couplings in external electromagnetic fields. We
point out that axion-photon interaction induces an electron spin effective
coupling, which is ... | 2102.04669v1 |
2021-02-02 | Chimeras and clusters emerging from robust-chaos dynamics | We show that dynamical clustering, where a system segregates into
distinguishable subsets of synchronized elements, and chimera states, where
differentiated subsets of synchronized and desynchronized elements coexist, can
emerge in networks of globally coupled robust-chaos oscillators. We describe
the collective behavi... | 2102.06087v1 |
2021-02-17 | Sharp Boundaries for the Swampland | We reconsider the problem of bounding higher derivative couplings in
consistent weakly coupled gravitational theories, starting from general
assumptions about analyticity and Regge growth of the S-matrix. Higher
derivative couplings are expected to be of order one in the units of the UV
cutoff. Our approach justifies t... | 2102.08951v2 |
2021-02-18 | Subgrid multiscale stabilized finite element analysis of non-Newtonian Power-law model fully coupled with Advection-Diffusion-Reaction equations | This article presents stability and convergence analyses of subgrid
multiscale stabilized finite element formulation of non-Newtonian power-law
fluid flow model strongly coupled with variable coefficients
Advection-Diffusion-Reaction ($VADR$) equation. Considering the highly
non-linear viscosity coefficient as solute c... | 2102.09170v1 |
2021-02-19 | Axion-matter coupling in multiferroics | Multiferroics (MFs) are materials with two or more ferroic orders, like
spontaneous ferroelectric and ferromagnetic polarizations. Such materials can
exhibit a magnetoelectric effect whereby magnetic and ferroelectric
polarizations couple linearly, reminiscent of, but not identical to the
electromagnetic $\boldsymbol{E... | 2102.10171v2 |
2021-02-23 | Limit on Higgs boson trilinear self-coupling in coupled technicolor models | The trilinear self-coupling of the Higgs boson, in a theory in which this
boson is composite, is compared to the experimental bound of this quantity
obtained by the CMS experiment. In the case of a model where technicolor (TC)
is coupled to QCD, we find that the experimental result already constrain the
dynamics of the... | 2102.11709v3 |
2021-02-23 | Tunable Cooperativity in Coupled Spin--Cavity Systems | We experimentally study the tunability of the cooperativity in coupled
spin--cavity systems by changing the magnetic state of the spin system via an
external control parameter. As model system, we use the skyrmion host material
Cu$_2$OSeO$_3$ coupled to a microwave cavity resonator. In the different
magnetic phases we ... | 2102.11713v1 |
2013-06-11 | Estimates for the Thermal Width of Heavy Quarkonia in Strongly Coupled Plasmas from Holography | The gauge/gravity duality is used to investigate the imaginary part of the
heavy quark potential (defined via the rectangular Wilson loop) in strongly
coupled plasmas. This quantity can be used to estimate the width of heavy
quarkonia in a plasma at strong coupling. In this paper the thermal worldsheet
fluctuation meth... | 1306.2613v2 |
2013-06-12 | Atomic spin-orbit coupling synthesized with magnetic-field-gradient pulses | We discuss a general scheme for creating atomic spin-orbit coupling (SOC)
such as the Rashba or Dresselhaus types using magnetic-field-gradient pulses.
In contrast to conventional schemes based on adiabatic center-of-mass motion
with atomic internal states restricted to a dressed-state subspace, our scheme
works for th... | 1306.2829v1 |
2013-06-12 | Dissipative dynamics of a driven quantum spin coupled to a bath of ultracold fermions | We explore the dynamics and the steady state of a driven quantum spin coupled
to a bath of fermions, which can be realized with a strongly imbalanced mixture
of ultracold atoms using currently available experimental tools.
Radio-frequency driving can be used to induce tunneling between the spin
states. The Rabi oscilla... | 1306.2947v2 |
2013-06-14 | Localized modes in dense repulsive and attractive Bose-Einstein condensates with spin-orbit and Rabi couplings | We consider a binary Bose-Einstein condensate with linear and nonlinear
interactions between its components, which emulate the spinor system with
spin-orbit (SO) and Rabi couplings. For a relatively dense condensate, 1D
coupled equations with the nonpolynomial nonlinearity of both repulsive and
attractive signs are der... | 1306.3402v1 |
2013-06-19 | Spin-Orbit Coupling Induced Coherent Production of Feshbach Molecules in a Degenerate Fermi Gas | In this work we demonstrate a dynamic process in which SO coupling can
coherently produce s-wave Feshbach molecules from a fully polarized Fermi gas,
and can induce a coherent oscillation between Feshbach molecules and spin
polarized gas. For comparison, we also show that such phenomena are absent if
the inter-componen... | 1306.4568v2 |
2015-07-01 | Controlling photon transport in the single-photon weak-coupling regime of cavity optomechanics | We study the photon statistics properties of few-photon transport in an
optomechanical system where an optomechanical cavity couples to two empty
cavities. By analytically deriving the one- and two-photon currents in terms of
a zero-time-delayed two-order correlation function, we show that a photon
blockade can be achi... | 1507.00178v1 |
2015-07-01 | Dynamical spin-density waves in a spin-orbit-coupled Bose-Einstein condensate | Synthetic spin-orbit (SO) coupling, an important ingredient for quantum
simulation of many exotic condensed matter physics, has recently attracted
considerable attention. The static and dynamic properties of a SO coupled
Bose-Einstein condensate (BEC) have been extensively studied in both theory and
experiment. Here we... | 1507.00318v1 |
2015-07-07 | Approximating electronically excited states with equation-of-motion linear coupled-cluster theory | A new perturbative approach to canonical equation-of-motion coupled-cluster
theory is presented using coupled-cluster perturbation theory. A second-order
M{\o}ller-Plesset partitioning of the Hamiltonian is used to obtain the well
known equation-of-motion many-body perturbation theory (EOM-MBPT(2)) equations
and two ne... | 1507.01969v1 |
2015-07-13 | Coupling quantum circuits to magnetic molecular qubits | This thesis explores the coupling of magnetic systems to quantum circuits in
the context of quantum computing applications. In particular we study the
coupling of superconducting coplanar waveguide resonators to Single Molecule
Magnets (SMMs) . The combination of approaches from the fields of Cavity
Quantum electrodyna... | 1507.03579v2 |
2015-12-04 | Isotropy of Angular Frequencies and Weak Chimeras With Broken Symmetry | The notion of a weak chimeras provides a tractable definition for chimera
states in networks of finitely many phase oscillators. Here we generalize the
definition of a weak chimera to a more general class of equivariant dynamical
systems by characterizing solutions in terms of the isotropy of their angular
frequency ve... | 1512.01321v4 |
2015-12-08 | Multi-orbital quantum antiferromagnetism in iron pnictides --- effective spin couplings and quantum corrections to sublattice magnetization | Towards understanding the multi-orbital quantum antiferromagnetism in iron
pnictides, effective spin couplings and spin fluctuation induced quantum
corrections to sublattice magnetization are obtained in the $(\pi,0)$ AF state
of a realistic three band interacting electron model involving $xz$, $yz$, and
$xy$ Fe 3d orb... | 1512.02398v1 |
2015-12-09 | Ground-state cooling of dispersively coupled optomechanical system in unresolved sideband regime via dissipatively coupled oscillator | In the optomechanical cooling of a dispersively coupled oscillator, it is
only possible to reach the oscillator ground state in the resolved sideband
regime, where the cavity-mode line width is smaller than the resonant frequency
of the mechanical oscillator being cooled. In this paper, we show that the
dispersively co... | 1512.02795v2 |
2015-12-14 | Anderson Localization in Degenerate Spin-Orbit Coupled Fermi Gases with Disorder | Competition between superconductivity and disorder plays an essential role in
understanding the metal-insulator transition. Based on the Bogoliubov-de Gennes
equation, we studied an s-wave superconductor with both spin-orbit coupling and
disorder are presented. With increasing the strength of disorder, the mean
superco... | 1512.04211v2 |
2015-12-16 | Escaping in couples facilitates evacuation: Experimental study and modeling | In this paper, the impact of escaping in couples on the evacuation dynamics
has been investigated via experiments and modeling. Two sets of experiments
have been implemented, in which pedestrians are asked to escape either in
individual or in couples. The experiments show that escaping in couples can
decrease the avera... | 1512.05120v1 |
2015-12-18 | Gravitational Collapse of a Homogeneous Scalar Field Coupled Kinematically to Einstein Tensor | We study the gravitational collapse of a homogeneous time-dependent scalar
field that, besides its coupling to curvature, it is also kinematically coupled
to the Einstein tensor. This coupling is a part of the Horndeski theory and we
investigate its effect on the collapsing process. We find that the time
required for t... | 1512.05934v4 |
2015-12-18 | Geodesic acoustic modes with poloidal mode couplings ad infinitum | Geodesic acoustic modes (GAMs) are studied, for the first time, including all
poloidal mode $(m)$ couplings using drift reduced fluid equations. The nearest
neighbor coupling pattern, due to geodesic curvature, leads to a semi-infinite
chain model of the GAM with the mode-mode coupling matrix elements proportional
to t... | 1512.06066v1 |
2015-12-20 | Semi-Holography for Heavy Ion Collisions: Self-Consistency and First Numerical Tests | We present an extended version of a recently proposed semi-holographic model
for heavy-ion collisions, which includes self-consistent couplings between the
Yang-Mills fields of the Color Glass Condensate framework and an infrared
AdS/CFT sector, such as to guarantee the existence of a conserved
energy-momentum tensor f... | 1512.06445v2 |
2015-12-22 | Dark matter from gravitational particle production at reheating | We show that curvature induced particle production at reheating generates
adiabatic dark matter if there are non-minimally coupled spectator scalars
weakly coupled to visible matter. The observed dark matter abundance implies an
upper bound on spectator masses $m$ and non-minimal coupling values $\xi$. For
example, ass... | 1512.07288v4 |
2015-12-23 | Bose-Einstein condensate in an optical lattice with Raman-assisted two-dimensional spin-orbit coupling | In a recent experiment by Wu {\textit et al.} (arXiv:1511.08170), a
Raman-assisted two-dimensional spin-orbit coupling has been realized for a
Bose-Einstein condensate in an optical lattice potential. In light of this
exciting progress, we study in detail key properties of the system. As the
Raman lasers inevitably cou... | 1512.07448v3 |
2015-12-24 | Stabilizing coherence with nested environments: a numerical study using kicked Ising models | We study a tripartite system of coupled spins, where a first set of one or
two spins is our central system which is coupled to another set considered, the
near environment, in turn coupled to the third set, the far environment. The
dynamics considered are those of a generalized kicked spin chain in the regime
of quantu... | 1512.07683v1 |
2015-12-26 | Classical and Quantum Stability in Putative Landscapes | Landscape analyses often assume the existence of large numbers of fields,
$N$, with all of the many couplings among these fields (subject to constraints
such as local supersymmetry) selected independently and randomly from simple
(say Gaussian) distributions. We point out that unitarity and perturbativity
place signifi... | 1512.08125v3 |
2015-12-30 | Higher-Derivative Gravity with Non-minimally Coupled Maxwell Field | We construct higher-derivative gravities with a non-minimally coupled Maxwell
field. The Lagrangian consists of polynomial invariants built from the Riemann
tensor and the Maxwell field strength in such a way that the equations of
motion are second order for both the metric and the Maxwell potential. We also
generalize... | 1512.09153v1 |
2015-12-31 | Optimised multi-ion cavity coupling | Recent technological advances in cavity quantum electrodynamics (CQED) are
paving the way to utilise multiple quantum emitters confined in a single
optical cavity. In such systems it is crucially important to control the
quantum mechanical coupling of individual emitters to the cavity mode. In this
regard, combining io... | 1512.09346v1 |
2016-09-02 | Influence of coupling on thermal forces and dynamic friction in plasmas with multiple ion species | The recently proposed effective potential theory [Phys. Rev. Lett. 110,
235001 (2013)] is used to investigate the influence of coupling on
inter-ion-species diffusion and momentum exchange in multi-component plasmas.
Thermo-diffusion and the thermal force are found to diminish rapidly as strong
coupling onsets. For the... | 1609.00742v4 |
2016-09-05 | Landau-Zener transitions in an open multilevel quantum system | We consider the Landau-Zener problem for a multilevel quantum system that is
coupled to an external environment. In particular, we consider a number of
cases of three-level systems coupled to a harmonic oscillator that represents
the external environment. We find that, similar to the case of the Landau-Zener
problem wi... | 1609.01150v2 |
2016-09-06 | Multiple Rabi Splittings under Ultra-Strong Vibrational Coupling | From the high vibrational dipolar strength offered by molecular liquids, we
demonstrate that a molecular vibration can be ultra-strongly coupled to
multiple IR cavity modes, with Rabi splittings reaching $24\%$ of the vibration
frequencies. As a proof of the ultra-strong coupling regime, our experimental
data unambiguo... | 1609.01520v1 |
2016-09-06 | Possible Explanation of the Electron Positron Anomaly at 17 MeV in $^8Be$ Transitions Through a Light Pseudoscalar | We estimate the values of Yukawa couplings of a light pseudoscalar A with a
mass of about 17 MeV, which would explain the $^8Be$ anomaly observed in the
Atomki pair spectrometer experiment. The resulting couplings of A to up and
down type quarks are about 0.3 times the coupling of the standard Higgs boson.
Then constra... | 1609.01669v2 |
2016-09-07 | Bifurcations observed in the spectra of coupled electron-phonon modes in multiferroic $PrFe_3(BO_3)_4$ subjected to a magnetic field | We report on bifurcations effect mediated by the electron-phonon coupling in
a concentrated rare-earth-containing antiferromagnet, observed in the spectra
of coupled $4f$-electron-phonon modes under the influence of an external
magnetic field. The effect was observed in the low-temperature far-infrared
(terahertz) refl... | 1609.02125v1 |
2016-09-08 | Principal modes in multimode fibers: exploring the crossover from weak to strong mode coupling | We present experimental and numerical studies on principal modes in a
multimode fiber with mode coupling. By applying external stress to the fiber
and gradually adjusting the stress, we have realized a transition from weak to
strong mode coupling, which corresponds to the transition from single
scattering to multiple s... | 1609.02516v1 |
2016-09-08 | Fate of the one-dimensional Ising quantum critical point coupled to a gapless boson | The problem of a quantum Ising degree of freedom coupled to a gapless bosonic
mode appears naturally in many one dimensional systems, yet surprisingly little
is known how such a coupling affects the Ising quantum critical point. We
investigate the fate of the critical point in a regime, where the weak coupling
renormal... | 1609.02599v3 |
2016-09-14 | Inhibitory loop robustly induces anticipated synchronization in neuronal microcircuits | We investigate the synchronization properties between two excitatory coupled
neurons in the presence of an inhibitory loop mediated by an interneuron.
Dynamical inhibition together with noise independently applied to each neuron
provide phase diversity in the dynamics of the neuronal motif. We show that the
interplay b... | 1609.04419v1 |
2016-09-15 | Diffused vorticity and moment of inertia of a spin-orbit coupled Bose-Einstein condensate | By developing the hydrodynamic theory of spinor superfluids we calculate the
moment of inertia of a harmonically trapped Bose-Einstein condensate with
spin-orbit coupling. We show that the velocity field associated with the
rotation of the fluid exhibits diffused vorticity, in contrast to the
irrotational behavior char... | 1609.04694v2 |
2016-09-20 | Exclusive Weak Radiative Higgs Decays in the Standard Model and Beyond | We perform a detailed study of the exclusive Higgs decays $h\to MZ$ and $h\to
MW$, where $M$ is a pseudoscalar or vector meson, using the QCD factorization
approach. We allow for the presence of new-physics effects in the form of
modified Higgs couplings to gauge bosons and fermions, including the
possibility of flavor... | 1609.06310v2 |
2016-09-28 | Measuring the trilinear neutral Higgs boson couplings in the MSSM at $e^+ e^-$ colliders | We consider the measurement of the trilinear couplings of the neutral Higgs
bosons~($H^0, h^0$) in the minimal supersymmetric standard model~(MSSM) at a
high energy $e^+$ $e^-$ linear collider in the light of the discovery of a
Higgs boson at the CERN Large Hadron Collider~(LHC). We identify the state
observed at the L... | 1609.08796v1 |
2016-09-30 | Transition moments between excited electronic states from the Hermitian formulation of the coupled cluster quadratic response function | We introduce a new method for the computation of the transition moments
between the excited electronic states based on the expectation value formalism
of the coupled cluster theory [B. Jeziorski and R. Moszynski, Int. J. Quant.
Chem. 48, 161 (1993)]. The working expressions of the new method solely employ
the coupled c... | 1609.09769v2 |
2016-11-02 | Topological Quantum Liquids with Long-Range Couplings | Very few topological systems with long-range couplings have been considered
so far due to our lack of analytic approaches. Here we extend the Kitaev chain,
a 1D quantum liquid, to infinite-range couplings and study its topological
properties. We demonstrate that, even though topological phases are intimately
linked to ... | 1611.00796v2 |
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