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2014-04-21 | Graphene with wedge disclination in the presence of intrinsic and Rashba spin orbit couplings | In this article, the modified Kane-Mele Hamiltonian is derived for graphene
with wedge disclination and spin orbit couplings (intrinsic and Rashba). The
wedge disclination changes the flat lattice into the conical lattice and hence
modifies the spin orbit couplings. The Hamiltonian is exactly solved for the
intrinsic s... | 1404.5150v2 |
2014-09-09 | Electron-spin dynamics in elliptically polarized light waves | We investigate the coupling of the spin angular momentum of light beams with
elliptical polarization to the spin degree of freedom of free electrons. It is
shown that this coupling, which is of similar origin as the well-known
spin-orbit coupling, can lead to spin precession. The spin-precession frequency
is proportion... | 1409.2647v2 |
2014-09-17 | Arbitrary Spin Galilean Oscillator | The so-called Dirac oscillator was proposed as a modification of the free
Dirac equation which reproduces many of the properties of the simple harmonic
oscillator but accompanied by a strong spin-orbit coupling term. It has yet to
be extended successfully to the arbitrary spin S case primarily because of the
unwieldine... | 1409.5101v1 |
2015-04-08 | Spin Seebeck Power Conversion | Spin caloritronics is the science and technology to control spin, charge, and
heat currents in magnetic nanostructures. The spin degree of freedom provides
new strategies for thermolelectric power generation that have not yet been
fully explored. After an elementary introduction into conventional
thermoelectrics and sp... | 1504.02002v1 |
2015-04-20 | Emergent topological properties in interacting one-dimensional systems with spin-orbit coupling | We present analysis of a single channel interacting quantum wire problem in
the presence of spin-orbit interaction. The spin-orbit coupling breaks the
spin-rotational symmetry from SU(2) to U(1) and breaks inversion symmetry. The
low-energy theory is then a two band model with a difference of Fermi
velocities $\delta v... | 1504.05016v2 |
2015-09-20 | Spin-axion coupling | We establish a new covariant phenomenological model, which describes an
influence of pseudoscalar (axion) field on spins of test massive particles. The
model includes general relativistic equations of particle motion and spin
evolution in background pseudoscalar (axion), electromagnetic and gravitational
fields. It des... | 1509.06058v2 |
2016-01-05 | Dynamics of interacting fermions in spin-dependent potentials | Recent experiments with dilute trapped Fermi gases observed that weak
interactions can drastically modify spin transport dynamics and give rise to
robust collective effects including global demagnetization, macroscopic spin
waves, spin segregation, and spin self-rephasing. In this work we develop a
framework for studyi... | 1601.01004v3 |
2016-04-15 | Determining the spin-orbit coupling via spin-polarized spectroscopy of magnetic impurities | We study the spin-resolved spectral properties of the impurity states
associated to the presence of magnetic impurities in two-dimensional, as well
as one-dimensional systems with Rashba spin-orbit coupling. We focus on Shiba
bound states in superconducting materials, as well as on impurity states in
metallic systems. ... | 1604.04623v3 |
2016-07-19 | Electrical detection of spiral spin structures in Pt|Cu_2OSeO_3 heterostructures | The interaction between the itinerant spins in metals and localized spins in
magnetic insulators thus far has only been explored in collinear spin systems,
such as garnets. Here, we report the spin-Hall magnetoresistance (SMR)
sensitive to the surface magnetization of the spin-spiral material, Cu_2OSeO_3.
We experiment... | 1607.05630v1 |
2017-08-28 | Observation of quantum spin noise in a 1D light-atoms quantum interface | We observe collective quantum spin states of an ensemble of atoms in a
one-dimensional light-atom interface. Strings of hundreds of cesium atoms
trapped in the evanescent fiel of a tapered nanofiber are prepared in a
coherent spin state, a superposition of the two clock states. A weak quantum
nondemolition measurement ... | 1708.08387v2 |
2017-11-20 | Precessional dynamics of black hole triples: binary mergers with near-zero effective spin | The binary black hole mergers detected by Advanced LIGO/Virgo have shown no
evidence of large black hole spins. However, because LIGO/Virgo best measures
the effective combination of the two spins along the orbital angular momentum
($\chi_{\rm eff}$), it is difficult to distinguish between binaries with
slowly-spinning... | 1711.07142v2 |
2018-09-20 | Entangling Distant Spin qubits via a Magnetic Domain Wall | The scalability of quantum networks based on solid-state spin qubits is
hampered by the short range of natural spin-spin interactions. Here, we propose
a scheme to entangle distant spin qubits via the soft modes of an
antiferromagnetic domain wall (DW). As spin qubits, we focus on quantum
impurities (QI's) placed in th... | 1809.07785v1 |
2018-10-29 | Superconductivity in the Hubbard model: a hidden-order diagnostics from the Luther-Emery phase on ladders | Short-range antiferromagnetic correlations are known to open a spin gap in
the repulsive Hubbard model on ladders with $M$ legs, when $M$ is even. We show
that the spin gap originates from the formation of correlated pairs of
electrons with opposite spin, captured by the hidden ordering of a spin-parity
operator. Since... | 1810.12268v2 |
2014-06-05 | Electric control of spin injection into a ferroelectric semiconductor | Electric-field control of spin-dependent properties has become one of the
most attractive phenomena in modern materials research due the promise of new
device functionalities. One of the paradigms in this approach is to
electrically toggle the spin polarization of carriers injected into a
semiconductor using ferroelect... | 1406.1434v1 |
2020-03-14 | Position and spin in relativistic quantum mechanics | The problem of the position and spin in relativistic quantum mechanics is
analyzed in detail. It is definitively shown that the position and spin
operators in the Foldy-Wouthuysen representation (but not in the Dirac one) are
quantum-mechanical counterparts of the classical position and spin variables.
The probabilisti... | 2003.06572v2 |
2021-02-18 | Spin distribution of binary black holes formed in open clusters | We performed direct N-body simulations of open clusters with four different
metallicities. To investigate the effective spins of merging binary black holes
(BBHs) originated from these open clusters, we calculated the spin evolution of
Wolf-Rayet (WR) stars with close companion stars (BBH progenitors), taking into
acco... | 2102.09323v1 |
2021-10-21 | Extrinsic spin angular momentum carried by plasmonic vortex in terahertz cylindrical corrugated waveguide | An electromagnetic surface wave carrying orbital angular momentum (AM) is
called plasmonic vortex that also carries spin AM originating from evanescent
field. In this study, spin and orbital AM of plasmonic vortex in a terahertz
cylindrical corrugated waveguide (CCW) are analyzed. We report the extrinsic
spin AM of the... | 2110.10893v1 |
2021-05-20 | Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering | Odd-parity magnetic and magnetic toroidal multipoles in the absence of both
spatial-inversion and time-reversal symmetries are sources of multiferroic and
nonreciprocal optical phenomena. We investigate electronic states caused by an
emergent odd-parity magnetic quadrupole (MQ) as a representative example of
magnetic o... | 2105.09444v1 |
2021-05-28 | Spin-orbit interactions of transverse sound | Spin-orbit interactions (SOIs) endow light with intriguing properties and
applications such as photonic spin-Hall effects and spin-dependent vortex
generations. However, it is counterintuitive that SOIs can exist for sound,
which is a longitudinal wave that carries no intrinsic spin. Here, we
theoretically and experime... | 2105.13558v1 |
2021-09-16 | Ground States of Heisenberg Spin Clusters from Projected Hartree-Fock Theory | We apply Projected Hartree-Fock theory (PHF) for approximating ground states
of Heisenberg spin clusters. Spin-rotational, point-group and
complex-conjugation symmetry are variationally restored from a broken-symmetry
mean-field reference, where the latter corresponds to a product of local spin
states. A fermionic form... | 2109.08041v1 |
2021-12-21 | Spin accumulation without spin current | The spin Hall (SH) effect is a phenomenon in which the spin current flows
perpendicular to an applied electric field and causes the spin accumulation at
the boundaries. However, in the presence of spin-orbit couplings, the spin
current is not well defined. Here, we calculate the spin response to an
electric-field gradi... | 2112.11043v3 |
2022-04-11 | Curvilinear spin-wave dynamics beyond the thin-shell approximation: Magnetic nanotubes as a case study | Surface curvature of magnetic systems can lead to many static and dynamic
effects which are not present in flat systems of the same material. These
emergent magnetochiral effects can lead to frequency nonreciprocity of spin
waves, which has been shown to be a bulk effect of dipolar origin and is
related to a curvature-... | 2204.05065v1 |
2004-08-26 | Orbital ordering, Jahn-Teller distortion, and resonant x-ray scattering in KCuF3 | The orbital, lattice, and spin ordering phenomena in KCuF3 are investigated
by means of LDA+U calculations, based on ab-initio pseudopotentials.We examine
the Cu-3d orbital ordering and the associated Jahn-Teller distortion in several
different spin-ordered structures of KCuF3. The ground state is correctly
predicted t... | 0408568v1 |
2013-08-01 | Electronic superlattice revealed by resonant scattering from random impurities in Sr3Ru2O7 | Resonant elastic x-ray scattering (REXS) is an exquisite element-sensitive
tool for the study of subtle charge, orbital, and spin superlattice orders
driven by the valence electrons, which therefore escape detection in
conventional x-ray diffraction (XRD). Although the power of REXS has been
demonstrated by numerous st... | 1308.0185v1 |
2013-08-02 | Strong coupling behavior of the neutron resonance mode in unconventional superconductors | We analyze whether and how the neutron resonance mode in unconventional
superconductors is affected by higher order corrections in the coupling between
spin excitations and fermionic quasiparticles and find that in general such
corrections cannot be ignored. In particular, we find that in two spatial
dimensions (d=2) t... | 1308.0427v3 |
2016-04-25 | Frequency-based nanoparticle sensing over large field ranges using the ferromagnetic resonances of a magnetic nanodisc | Using finite element micromagnetic simulations, we study how resonant
magnetisation dynamics in thin magnetic discs with perpendicular anisotropy are
influenced by magnetostatic coupling to a magnetic nanoparticle. We identify
resonant modes within the disc using direct magnetic eigenmode calculations and
study how the... | 1604.07277v2 |
2023-04-27 | Asymmetric Chiral Coupling in a Topological Resonator | Chiral light-matter interactions supported by topological edge modes at the
interface of valley photonic crystals provide a robust method to implement the
unidirectional spin transfer. The valley topological photonic crystals possess
a pair of counterpropagating edge modes. The edge modes are robust against the
sharp b... | 2304.13904v1 |
2023-09-19 | Capacitive crosstalk in gate-based dispersive sensing of spin qubits | In gate-based dispersive sensing, the response of a resonator attached to a
quantum dot gate is detected by a reflected radio-frequency signal. This
enables fast readout of spin qubits and tune up of arrays of quantum dots, but
comes at the expense of increased susceptibility to crosstalk, as the resonator
can amplify ... | 2309.10473v1 |
2024-01-26 | Low loss hybrid Nb/Au superconducting resonators for quantum circuit applications | Superconducting resonators play a crucial role in developing forthcoming
quantum computing schemes. The complete integration of molecular spin-based
quantum bits with superconducting resonators still requires further
developments, notably in maintaining low-loss resonances and high quality
factors. In this work, we hav... | 2401.14764v1 |
2024-01-28 | Long-Term Evolution of the Saturnian System | Here we present the current state of knowledge on the long-term evolution of
Saturn's moon system due to tides within Saturn. First we provide some
background on tidal evolution, orbital resonances and satellite tides. Then we
address in detail some of the present and past orbital resonances between
Saturn's moons (inc... | 2401.15797v1 |
2001-10-18 | Dominant mode in the cuprates: electronic vs. phononic scenario | We make the case for an electronic origin of the strong mode, recently seen
in ARPES experiments, and, in this regard, further discuss the physics of the
spin resonance peak. | 0110368v2 |
2002-11-08 | Comment on "Correlation of Tunneling Spectra in Bi2212 with the Resonance Spin Excitation" | The interpretation of tunneling data in a recent Letter by Zasadzinski et al.
is incorrect. | 0211148v2 |
2002-10-31 | A Strong Electroweak Sector at Future Colliders | A brief overview of the production at future colliders of two new triplets of
spin one resonances from a strong electroweak breaking is presented. | 0210438v1 |
2007-05-08 | Controllability of the coupled spin-half harmonic oscillator system | We present a control-theoretic analysis of the system consisting of a
two-level atom coupled with a quantum harmonic oscillator. We show that by
applying external fields with just two resonant frequencies, any desired
unitary operator can be generated. | 0705.1055v1 |
2008-08-26 | Magnetic field modification of ultracold molecule-molecule collisions | We present an accurate quantum mechanical study of molecule-molecule
collisions in the presence of a magnetic field. The work focusses on the
analysis of elastic scattering and spin relaxation in collisions of
O2(3Sigma_g) molecules at cold (~0.1 K) and ultracold (~10^{-6} K)
temperatures. Our calculations show that ma... | 0808.3592v2 |
2009-04-30 | Spin and model identification of Z' bosons at the LHC | Heavy resonances appearing in the clean Drell-Yan channel may be the first
new physics to be observed at the proton-proton CERN LHC. If a new resonance is
discovered at the LHC as a peak in the dilepton invariant mass distribution,
the characterization of its spin and couplings will proceed via measuring
production rat... | 0904.4857v1 |
2010-08-27 | Spin-transfer-torque resonant switching and injection locking in presence of a weak external microwave field for spin valves with perpendicular materials | The effects of a weak microwave field in the magnetization dynamics driven by
spin-transfer-torque in spin-valves with perpendicular materials have been
systematically studied by means of full micromagnetic simulations. In the
system we studied, depending on the working point (bias field and current) in
the dynamical s... | 1008.4746v1 |
2013-02-27 | Hidden charm N and Delta resonances with heavy-quark symmetry | We develop a model to describe odd parity baryon resonances generated
dynamically through a unitary baryon-meson coupled-channels approach. The
scheme applies to channels with light and/or heavy quark content. Distinct
features of the model are that, i) the interaction is an S-wave contact one,
ii) it reduces to the SU... | 1302.6938v1 |
2017-02-17 | Quantum dimer models emerging from large-spin ultracold atoms | We propose an experimental protocol for using cold atoms to create and probe
quantum dimer models, thereby exploring the Pauling-Anderson vision of a
macroscopic collection of resonating bonds. This process can allow the study of
exotic crystalline phases, fractionalization, topological spin liquids, and the
relationsh... | 1702.05514v3 |
2017-10-10 | Magnetic and superconducting properties on S-type single-crystal CeCu$_2$Si$_2$ probed by $^{63}$Cu nuclear magnetic resonance and nuclear quadrupole resonance | We have performed $^{63}$Cu nuclear magnetic resonance/nuclear quadrupole
resonance measurements to investigate the magnetic and superconducting (SC)
properties on a "superconductivity dominant" ($S$-type) single crystal of
CeCu$_2$Si$_2$. Although the development of antiferromagnetic (AFM)
fluctuations down to 1~K ind... | 1710.03364v1 |
2017-10-24 | Hyperfine interactions of $\text{Er}^{3+}$ ions in $\text{Y}_2\text{SiO}_{5}$: electron paramagnetic resonance in a tunable microwave cavity | The hyperfine structure of the ground state of erbium doped yttrium
orthosilicate is analyzed with the use of electron paramagnetic resonance
experiments in a tunable microwave resonator. This work was prompted by the
disagreement between the measurements made in zero magnetic field [Phys. Rev.
B, 94, 075117, (2016)] a... | 1710.09014v2 |
2017-10-30 | Temperature and polarization dependence of low-energy magnetic fluctuations in nearly-optimal-doped NaFe$_{0.9785}$Co$_{0.0215}$As | We use unpolarized and polarized neutron scattering to study the temperature
and polarization dependence of low-energy magnetic fluctuations in
nearly-optimal-doped NaFe$_{0.9785}$Co$_{0.0215}$As, with coexisting
superconductivity ($T_{\rm c}\approx19$ K) and weak antiferromagnetic order
($T_{\rm N}\approx30$ K, ordere... | 1710.11083v1 |
2022-02-15 | Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe$_2$ | Quantum spin liquids (QSLs) are highly entangled, disordered magnetic states
that arise in frustrated Mott insulators and host exotic fractional excitations
such as spinons and chargons. Despite being charge insulators some QSLs are
predicted to exhibit gapless itinerant spinons that yield metallic behavior in
the spin... | 2202.07224v1 |
2023-11-07 | Coupling nitrogen-vacancy centre spins in diamond to a grape dimer | Two grapes irradiated inside a microwave (MW) oven typically produce a series
of sparks and can ignite a violent plasma. The underlying cause of the plasma
has been attributed to the formation of morphological-dependent resonances
(MDRs) in the aqueous dielectric dimers that lead to the generation of a strong
evanescen... | 2311.03951v1 |
1993-09-29 | A Bosonic Mean-Field Theory for Frustrated Heisenberg Antiferromagnets in Two Dimensions | We use a recently developed bosonic mean-field theory (MFT) to study the
ordered ground states of frustrated Heisenberg antiferromagnets (FHAFM) in two
dimensions. We emphasize the role of condensates in satisfying the MF
variational equations and their relation to spin correlation functions at low
temperatures. Our re... | 9309054v1 |
1997-02-05 | Landau Theory of Stripe Phases in Cuprates and Nickelates | We consider a Landau theory of coupled charge and spin-density wave order
parameters as a simple model for the ordering that has been observed
experimentally in the La_2NiO_4 and La_2CuO_4 families of doped
antiferromagnets. The period of the charge-density wave is generically half
that of the spin-density wave, or equ... | 9702055v1 |
1997-03-25 | Phase Diagram of the Half-Filled Extended Hubbard Model in Two Dimensions | We consider an extended Hubbard model of interacting fermions on a lattice.
The fermion kinetic energy corresponds to a tight binding Hamiltonian with
nearest neighbour (-t) and next nearest neighbour (t') hopping matrix elements.
In addition to the onsite Hubbard interaction (U) we also consider a nearest
neighbour re... | 9703213v1 |
1999-02-10 | Low Temperature Static and Dynamic Behavior of the Two-Dimensional Easy-Axis Heisenberg Model | We apply the self-consistent harmonic approximation (SCHA) to study static
and dynamic properties of the two-dimensional classical Heisenberg model with
easy-axis anisotropy. The static properties obtained are magnetization and spin
wave energy as functions of temperature, and the critical temperature as a
function of ... | 9902149v1 |
1999-02-11 | Neutron Scattering Study of Spin Density Wave Order in the Superconducting State of Excess-Oxygen-Doped La2CuO4+y | We report neutron scattering measurements of spin density wave order within
the superconducting state of a single crystal of predominately stage-4
La2CuO4+y with a Tc(onset) of 42 K. The low temperature elastic magnetic
scattering is incommensurate with the lattice and is characterized by
long-range order in the copper... | 9902157v2 |
2000-01-04 | Roton Instability of the Spin Wave Excitation in the Fully Polarized Quatum Hall State and the Phase Diagram at $ν= 2$ | We consider the effect of interactions on electrons confined to two
dimensions at Landau level filling $\nu=2$, with the specific aim to determine
the range of parameters where the fully polarized state is stable. We calculate
the charge and the spin density collective modes in random phase approximation
(RPA) includin... | 0001036v1 |
2005-06-24 | Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4 | We study dynamical properties of the anisotropic triangular quantum
antiferromagnet Cs_2CuCl_4. Inelastic neutron scattering measurements have
established that the dynamical spin correlations cannot be understood within a
linear spin wave analysis. We go beyond linear spin wave theory by taking
interactions between mag... | 0506667v1 |
2006-01-02 | Three--body Correlation Effects on the Spin Dynamics of Double--Exchange Ferromagnets | We present a variational calculation of the spin wave excitation spectrum of
double--exchange ferromagnets in different dimensions. Our theory recovers the
Random Phase approximation and 1/S expansion results as limiting cases and can
be used to study the intermediate exchange coupling and electron concentration
regime... | 0601025v2 |
2006-02-02 | Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2 | The spin wave excitations of the ideal S=5/2 Kagome lattice antiferromagnet
KFe3(OH)6(SO4)2 have been measured using high-resolution inelastic neutron
scattering. We directly observe a flat mode which corresponds to a lifted "zero
energy mode," verifying a fundamental prediction for the Kagome lattice. A
simple Heisenb... | 0602036v2 |
2007-02-21 | Spin waves throughout the Brillouin zone and magnetic exchange coupling in ferromagnetic metallic manganites La$_{1-x}$Ca$_{x}$MnO$_3$ ($x=0.25,0.30$) | Using time-of-flight and triple-axis inelastic neutron spectroscopy, we
determine spin wave excitations throughout the Brillouin zone for ferromagnetic
manganites La$_{1-x}$Ca$_x$MnO$_3$ ($x=0.25,0.3$) in their low temperature
metallic states. While spin wave excitations in the long wavelength limit (spin
stiffness $D$... | 0702504v1 |
2003-11-04 | Avoiding superluminal propagation of higher spin waves via projectors onto W^2 invariant subspaces | We propose to describe higher spins as invariant subspaces of the Casimir
operators of the Poincar\'{e} Group, P^{2}, and the squared Pauli-Lubanski
operator, W^{2}, in a properly chosen representation, \psi(p) (in momentum
space), of the Homogeneous Lorentz Group. The resulting equation of motion for
any field with s\... | 0311055v2 |
2001-11-27 | Parity Doubling, Zitterbewegung, and Rest Mass for Spin 1 | A 6-component "wave function" (not field, but S-matrix interpretable) for a
massive spin-1 particle parallels the Dirac "chirality-doubled" 4-component
wave function for a spin-1/2 particle, by pairing two wave functions for same
spin but opposite "handedness". The correlated "opposite-parity" pair of
complex 3-vectors... | 0111250v1 |
2004-02-21 | Topological spin transport of photons: the optical Magnus Effect and Berry Phase | The paper develops a modified geometrical optics (GO) of smoothly
inhomogeneous isotropic medium, which takes into account two topological
phenomena: Berry phase and the optical Magnus effect. By using the analogy
between a quasi-classical motion of a quantum particle with a spin and GO of an
electromagnetic wave in sm... | 0402110v1 |
2010-01-06 | Photonic Phase Gate via an Exchange of Fermionic Spin Waves in a Spin Chain | We propose a new protocol for implementing the two-qubit photonic phase gate.
In our approach, the pi phase is acquired by mapping two single photons into
atomic excitations with fermionic character and exchanging their positions. The
fermionic excitations are realized as spin waves in a spin chain, while photon
storag... | 1001.0968v3 |
2010-06-07 | Theory of spin waves in ferromagnetic (Ga,Mn)As | The collective behavior of spins in a dilute magnetic semiconductor is
determined by their mutual interactions and influenced by the underlying
crystal structure. Hence, we begin with the atomic quantum-mechanical
description of this system using the proposed variational-perturbation
calculus, and then turn to the emer... | 1006.1271v4 |
2010-10-04 | Anisotropic surface transport in topological insulators in proximity to a helical spin density wave | We study the effects of spatially localized breakdown of time reversal
symmetry on the surface of a topological insulator (TI) due to proximity to a
helical spin density wave (HSDW). The HSDW acts like an externally applied
one-dimensional periodic(magnetic) potential for the spins on the surface of
the TI, rendering t... | 1010.0683v2 |
2010-11-03 | Temporal behavior of the inverse spin Hall voltage in a magnetic insulator-nonmagnetic metal structure | It is demonstrated that upon pulsed microwave excitation, the temporal
behavior of a spin-wave induced inverse spin Hall voltage in a magnetic
insulator-nonmagnetic metal structure is distinctly different from the temporal
evolution of the directly excited spin-wave mode from which it originates. The
difference in temp... | 1011.0889v2 |
2011-06-27 | Effect of intraband Coulomb repulsion on the excitonic spin-density wave | We present a study of the magnetic ground state of a two-band model with
nested electron and hole Fermi surfaces and both interband and intraband
Coulomb interactions. Our aim is to understand how the excitonic
spin-density-wave (ESDW) state induced by the interband Coulomb repulsion is
affected by the intraband intera... | 1106.5315v2 |
2011-10-03 | A novel nonlinear spin wave theory for the spin 1/2 antiferromagnetic Heisenberg model on a triangular lattice | We extend the nonlinear spin wave theory (NLSWT) for the spin 1/2
antiferromagnetic Heisenberg model on a triangular lattice (TAFHM). This novel
NLSWT considers the corrections one order higher in 1/S than the linear spin
wave theory (LSWT). It also distinguishes in which circumstance the negative
energy excitation, th... | 1110.0377v2 |
2012-06-27 | Discrete antiferromagnetic spin-wave excitations in the giant ferric wheel Fe18 | The low-temperature elementary spin excitations in the AFM molecular wheel
Fe18 were studied experimentally by inelastic neutron scattering and
theoretically by modern numerical methods, such as dynamical density matrix
renormalization group or quantum Monte Carlo techniques, and analytical
spin-wave theory calculation... | 1206.6203v1 |
2012-08-17 | Routes to heavy-fermion superconductivity | Superconductivity in lanthanide- and actinide-based heavy-fermion metals can
have different microscopic origins. Among others, Cooper pair formation based
on fluctuations of the valence, of the quadrupole moment or of the spin of the
localized 4f/5f shell have been proposed. Spin-fluctuation mediated
superconductivity ... | 1208.3684v1 |
2013-06-08 | Systematic Effective Field Theory Analysis of the D=2+1 Quantum XY Model at Low Temperatures | The low-temperature properties of the (2+1)-dimensional quantum XY model are
studied within the framework of effective Lagrangians up to three-loop order.
At zero temperature, the system is characterized by a spontaneously broken spin
rotation symmetry, O(2) $\to$ 1, where the corresponding Goldstone bosons are
the spi... | 1306.1944v1 |
2013-09-19 | Wave packet dynamics in the one-dimensional extended Hubbard model | Using time-dependent density-matrix renormalization group, we study the time
evolution of electronic wave packets in the one-dimensional extended Hubbard
model with on-site and nearest neighbor repulsion, U and V, respectively. As
expected, the wave packets separate into spin-only and charge-only excitations
(spin-char... | 1309.5119v1 |
2014-01-17 | Nonreciprocal spin-wave channeling along textures driven by the Dzyaloshinskii-Moriya interaction | Ultrathin metallic ferromagnets on substrates with strong spin-orbit coupling
can exhibit induced chiral interactions of the Dzyaloshinskii-Moriya (DM) form.
For systems with perpendicular anisotropy, the presence of DM interactions has
important consequences for current-driven domain-wall motion and underpins
possible... | 1401.4439v3 |
2014-07-13 | A Renormalization-Group Study of the Symmetry-Breaking Order Parameters in Spin-Orbit Coupled Iridates and Related Systems | We study the competition between various forms of density-wave-like order
parameters that may arise in multi-orbital correlated materials with strong
spin-orbit coupling (SOC) within a renormalization-group (RG) approach. The
calculations are restricted to models with two spin-orbit split bands having
strong inter-band... | 1407.3440v1 |
2014-09-04 | Electron with arbitrary pseudo spins in multilayer graphene | Using the low-energy effective Hamiltonian of the ABC-stacked multilayer
graphene, pseudo spin coupling to real orbital angular momentum of electron in
multilayer graphene is investigated. We show that electron wave function in
N-layer graphene mimics behavior of particle with spin of N/2. It is said that
for N greater... | 1409.1426v3 |
2014-12-30 | Detecting crystal symmetry fractionalization from the ground state: Application to $\mathbb Z_2$ spin liquids on the kagome lattice | In quantum spin liquid states, the fractionalized spinon excitations can
carry fractional crystal symmetry quantum numbers, and this symmetry
fractionalization distinguishes different topologically ordered spin liquid
states. In this work we propose a simple way to detect signatures of such
crystal symmetry fractionali... | 1501.00009v2 |
2015-05-28 | Incommensurate spin density wave at a ferromagnetic quantum critical point in a three-dimensional parabolic semimetal | We explore the ferromagnetic quantum critical point in a three-dimensional
semimetallic system with upward- and downward-dispersing bands touching at the
Fermi level. Evaluating the static spin susceptibility to leading order in the
coupling between the fermions and the fluctuating ferromagnetic order
parameter, we fin... | 1505.07685v1 |
2015-06-17 | Partial-wave and helicity operators for the scattering of two hadrons in lattice QCD | Partial-wave operators for lattice QCD are developed in order to facilitate
the identification of the spins of two-hadron scattering states corresponding
to zero total momentum. Taking the periodic boundary conditions for lattice
states into account, orthogonal sets of partial-wave operators for orbital
angular momentu... | 1506.05492v1 |
2016-05-30 | Gauge invariant gluon spin operator for spinless non-linear wave solutions | We consider non-linear wave type solutions with mass scale parameter and
vahished canonical spin density operator in a pure SU(2) quantum chtomodynamics
(QCD). A new stationary solution which can be treated as a system of static
Wu-Yang monopole dressed in off-diagonal gluon field is proposed. A remarkable
feature of s... | 1605.09154v4 |
2016-06-06 | Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus Anisotropic Dzyaloshinskii-Moriya Interaction | High resolution inelastic neutron scattering reveals that the elementary
magnetic excitations in multiferroic MnWO4 consist of low energy dispersive
electromagnons in addition to the well-known spin-wave excitations. The latter
can well be modeled by a Heisenberg Hamiltonian with magnetic exchange coupling
extending to... | 1606.01954v1 |
2016-10-10 | Spin-Wave Spectrum in Magnetic Nanodot with Continuous Transition between Vortex, Bloch-type Skyrmion and Néel-type Skyrmion States | We study spin-wave excitations in a circular ferromagnetic nanodot in
different inhomogeneous, topologically non-trivial magnetization states,
specifically, vortex and skyrmion states. Gradual change in the strength of the
out-of-plane magnetic anisotropy and the Dzyaloshinskii-Moriya exchange
interaction leads to cont... | 1610.02859v1 |
2017-11-06 | Quantum gap and spin-wave excitations in the Kitaev model on a triangular lattice | We study the effects of quantum fluctuations on the dynamical generation of a
gap and on the evolution of the spin-wave spectra of a frustrated magnet on a
triangular lattice with bond-dependent Ising couplings, analog of the Kitaev
honeycomb model. The quantum fluctuations lift the subextensive degeneracy of
the class... | 1711.02016v1 |
2017-11-22 | Irreversible Markov chains in spin models: Topological excitations | We analyze the convergence of the irreversible event-chain Monte Carlo
algorithm for continuous spin models in the presence of topological
excitations. In the two-dimensional XY model, we show that the local nature of
the Markov-chain dynamics leads to slow decay of vortex-antivortex correlations
while spin waves decor... | 1711.08375v1 |
2018-10-23 | Magnonic Analogue of Black/White Hole Horizon in Superfluid $^3$He-B | We report on theoretical model and experimental results of the experiment
made in a limit of absolute zero temperature ($\sim$ 600\,$\mu$K) studying the
spin wave analogue of black/white hole horizon using spin (magnonic)
superfluidity in superfluid $^3$He-B. As an experimental tool simulating the
properties of the bla... | 1810.09890v2 |
2016-12-26 | Magnetic excitations in a three-orbital model for the strongly spin-orbit coupled iridates: Effect of mixing between the J=1/2 and 3/2 sectors | A three-orbital-model approach for studying spin wave excitations in the
strongly spin-orbit coupled layered perovskite iridates is presented which
provides a unified description of magnetic excitations as well as the
electronic band structure. The calculated spin wave dispersions with realistic
three-band parameters a... | 1612.08360v1 |
2017-06-20 | Optical Momentum, Spin, and Angular Momentum in Dispersive Media | We examine the momentum, spin, and orbital angular momentum of structured
monochromatic optical fields in dispersive inhomogeneous isotropic media. There
are two bifurcations in this general problem: the Abraham-Minkowski dilemma and
the kinetic (Poynting-like) versus canonical (spin-orbital) pictures. We show
that the... | 1706.06406v2 |
2021-02-24 | Quantum hydrodynamics of the spinor Bose-Einstein condensate at non-zero temperatures | Finite temperature hydrodynamic model is derived for the spin-1 ultracold
bosons by the many-particle quantum hydrodynamic method. It is presented as the
two fluid model of the BEC and normal fluid. The linear and quadratic Zeeman
effects are included. Scalar and spin-spin like short-range interactions are
considered i... | 2102.12538v1 |
2019-01-24 | Spin and orbital angular momenta of acoustic beams | We analyze spin and orbital angular momenta in monochromatic acoustic wave
fields in a homogeneous medium. Despite being purely longitudinal (curl-free),
inhomogeneous acoustic waves generically possess nonzero spin angular momentum
density caused by the local rotation of the vector velocity field. We show that
the int... | 1901.08962v3 |
2019-07-10 | How to search for gravitational waves from $r$-modes of known pulsars | Searches for continuous gravitational waves from known pulsars so far have
been targeted at or near the spin frequency or double the spin frequency of
each pulsar, appropriate for mass quadrupole emission. But some neutron stars
might radiate strongly through current quadrupoles via $r$-modes, which
oscillate at about ... | 1907.04946v1 |
2019-07-16 | Singular spin-flip interactions for the 1D Schrödinger operator | We consider singular self-adjoint extensions for one-dimensional
Schr\"{o}dinger operator for two-component wave function within the framework
of the distribution theory for discontinuous test functions
\cite{funcan_deltadistr_kurasov_jmathan1996}. We show that among
$\mathds{C}^{4}$-parameter set of boundary condition... | 1907.06893v4 |
2019-10-08 | Spatial coherence of spin-orbit-coupled Bose gases | Spin-orbit-coupled Bose-Einstein condensates (SOBECs) exhibit two new phases
of matter, now known as the stripe and plane-wave phases. When two interacting
spin components of a SOBEC spatially overlap, density modulations with
periodicity given by the spin-orbit coupling strength appear. In equilibrium,
these component... | 1910.03613v1 |
2021-01-12 | Temperature dependent appearance of exotic matter makes nascent neutron stars spin faster | Neutron stars offer the opportunity to study the behaviour of matter at
densities and temperatures inaccessible to terrestrial experiments.
Gravitational-wave observations of binary neutron star coalescences can
constrain the neutron-star equation of state before and after merger. After the
neutron star binary merges, ... | 2101.04782v1 |
2021-12-08 | Topological Doping and Superconductivity in Cuprates: An Experimental Perspective | Hole doping into a correlated antiferromagnet leads to topological stripe
correlations, involving charge stripes that separate antiferromagnetic spin
stripes of opposite phase. Topological spin stripe order causes the spin
degrees of freedom within the charge stripes to feel a geometric frustration
with their environme... | 2112.04557v1 |
2022-01-13 | Gravitational radiation from inspiralling compact objects: Spin effects to fourth Post-Newtonian order | The linear- and quadratic-in-spin contributions to the binding potential and
gravitational-wave flux from binary systems are derived to
next-to-next-to-leading order in the Post-Newtonian (PN) expansion of general
relativity, including finite-size and tail effects. The calculation is carried
out through the worldline e... | 2201.05138v1 |
2023-03-22 | Classification and emergence of quantum spin liquids in chiral Rydberg models | We investigate the nature of quantum phases arising in chiral interacting
Hamiltonians recently realized in Rydberg atom arrays. We classify all possible
fermionic chiral spin liquids with $\mathrm{U}(1)$ global symmetry using parton
construction on the honeycomb lattice. The resulting classification includes
six disti... | 2303.12829v2 |
2023-04-27 | Coherent magnetization dynamics in strongly quenched Ni thin films | The remagnetization process after ultrafast demagnetization can be described
by relaxation mechanisms between the spin, electron, and lattice reservoirs.
Thereby, collective spin excitations in form of spin waves and their angular
momentum transfer play an important role on the longer timescales. In this
work, we addre... | 2304.14325v1 |
2023-10-09 | Ordered phases and superconductivity in two-dimensional electron systems subject to pair spin-orbit interaction | Pair spin-orbit interaction can emerge in strongly-interacting systems
characterized by a large spin-orbit coupling. Here we study the role of this
interaction in stabilizing ordered and unconventional superconducting phases.
We find that, if the system avoids superconductivity, the order realized is a
combination of c... | 2310.06190v1 |
2023-11-17 | Superradiance in the Kerr-Taub-NUT spacetime | Superradiance is the effect of field waves being amplified during reflection
from a charged or rotating black hole. In this paper, we study the low-energy
dynamics of super-radiant scattering of massive scalar and massless higher spin
field perturbations in a generic axisymmetric stationary Kerr-Taub-NUT
(Newman-Unti-T... | 2311.10559v1 |
2023-11-25 | Spin pumping in YIG-Pt structures: the role of the van Hove singularities | Spin pumping by surface and backward volume magnetostatic waves in YIG/Pt
structures is experimentally studied and analyzed. It is shown that at
frequencies corresponding to van Hove singularities in the density of states of
the spin wave spectrum, an increase in the efficiency of electron-magnon
scattering and spin cu... | 2311.15096v1 |
2023-11-27 | Evidence of spin density waves in La$_3$Ni$_2$O$_{7-δ}$ | The recently discovered superconductivity with critical temperature $T_{c}$
up to 80 K in the Ruddlesden-Popper phases La$_3$Ni$_2$O$_{7-\delta}$ under
pressure has drawn great attention. Here we report the positive muon spin
relaxation ($\mu^+$SR) study of polycrystalline La$_3$Ni$_2$O$_{7-\delta}$
under ambient press... | 2311.15717v1 |
2024-01-28 | Magnetic interactions and excitations in SrMnSb$_2$ | The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal
candidate SrMnSb$_2$ are investigated using \textit{ab initio} linear response
theory and inelastic neutron scattering (INS). Our calculations reveal that the
first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature,
indicatin... | 2401.15572v1 |
2024-02-02 | THz spin-wave excitations in the transverse conical phase of BiFeO$_3$ | Although BiFeO$_3$ is one of the most studied multiferroic materials, recent
magnetization and neutron scattering studies have revealed a new magnetic phase
in this compound - the transverse conical phase. To study the collective spin
excitations of this phase, we performed THz spectroscopy in magnetic fields up
to 17 ... | 2402.01417v1 |
2008-02-07 | Spin-wave interaction in two-dimensional ferromagnets with dipolar forces | We discuss the spin-wave interaction in two-dimensional (2D) Heisenberg
ferromagnet (FM) with dipolar forces at $T_C\gg T\ge0$ using 1/S expansion. A
comprehensive analysis is carried out of the first 1/S corrections to the
spin-wave spectrum. In particular, similar to 3D FM discussed in our previous
paper A.V. Syromya... | 0802.0958v1 |
1998-05-05 | Thermally Activated Resonant Magnetization Tunneling in Molecular Magnets: Mn_12Ac and others | The dynamical theory of thermally activated resonant magnetization tunneling
in uniaxially anisotropic magnetic molecules such as Mn_12Ac (S=10) is
developed.The observed slow dynamics of the system is described by master
equations for the populations of spin levels.The latter are obtained by the
adiabatic elimination ... | 9805057v1 |
1998-12-17 | Resonant Processes in a Frozen Gas | We present a theory of resonant processes in a frozen gas of atoms
interacting via dipole-dipole potentials that vary as $r^{-3}$, where $r$ is
the interatomic separation. We supply an exact result for a single atom in a
given state interacting resonantly with a random gas of atoms in a different
state. The time develo... | 9812313v2 |
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