publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
|---|---|---|---|
2014-06-12 | Gyratonic pp-waves and their impulsive limit | We investigate a class of gravitational pp-waves which represent the exterior
vacuum field of spinning particles moving with the speed of light. Such exact
spacetimes are described by the original Brinkmann form of the pp-wave metric
including the often neglected off-diagonal terms. We put emphasis on a clear
physical ... | 1406.3227v2 |
2004-05-27 | Excitation of magnetostatic spin waves in ferromagnetic films | The torque equation of nonlinear spin dynamics is considered in the
magnetostatic approximation. In this framework, exact expressions for
propagator of linear magnetostatic waves in ferromagnetic film between two
antennas and corresponding mutual impedance of the antennas are derived, under
conditions of uniform but ar... | 0405640v1 |
2023-07-05 | Lifshitz model in the presence of spin-orbit coupling | Wave function of a localized state created by a short-range impurity in two
dimensions falls off with distance, r, from the impurity as r^{-1/2}exp(-r/a),
where "a" is the localization radius. With randomly positioned identical
impurities with low concentration, n<<a^{-2}, the level smears into a band due
to the overla... | 2307.01971v1 |
2023-10-26 | Spontaneously sliding multipole spin density waves in cold atoms | We report on the observation of spontaneously drifting coupled spin and
quadrupolar density waves in the ground state of laser driven Rubidium atoms.
These laser-cooled atomic ensembles exhibit spontaneous magnetism via light
mediated interactions when submitted to optical feedback by a retro-reflecting
mirror. Drift d... | 2310.17305v2 |
2024-01-16 | Wave packet treatment of neutrino flavour and spin oscillations in galactic and extragalactic magnetic fields | We consider neutrino flavour and spin oscillations in a magnetic field using
formalism of wave packets. Decoherence effects due to neutrino wave packets
separation are studied. The considered effects are especially important for
describing astrophysical neutrino oscillations, since they propagate on
kiloparsec scale an... | 2401.08724v2 |
2013-03-01 | Generation of Electrostatic Waves via Parametric Instability and Heating of Solar Corona | In the upper layers of the solar atmosphere the temperature increases
sharply. We studied possibility of the transfer of neutrals motion energy into
the electrostatic waves.Electrostatic waves could damp in the upper layers of
the solar atmosphere and their energy could be transformed into the thermal
energy of the sol... | 1303.0151v1 |
2018-05-31 | Bending Waves in the Milky Way's disc from halo substructure | We use $N$-body simulations to investigate the excitation of bending waves in
a Milky Way-like disc-bulge-halo system. The dark matter halo consists of a
smooth component and a population of subhaloes while the disc is composed of
thin and thick components. Also considered is a control simulation where all of
the halo ... | 1805.12449v2 |
2020-11-20 | Whistler Waves in the foot of Quasi-Perpendicular Super-Critical Shocks | Whistler waves are thought to play an essential role in the dynamics of
collisionless shocks. We use the magnetospheric multiscale (MMS) spacecraft to
study whistler waves around the lower hybrid frequency, upstream of 11
quasi-perpendicular super-critical shocks. We apply the 4-spacecraft timing
method to unambiguousl... | 2011.10593v4 |
2021-04-06 | Modeling interactions of narrowband large amplitude whistler-mode waves with electrons in the solar wind inside ~.3 AU and at 1 AU using a particle tracing code | The discovery of large-amplitude narrowband whistler-mode waves at
frequencies of tenths of the electron cyclotron frequency in large numbers both
inside ~.3 AU and at ~1 AU provides an answer to longstanding questions about
scattering and energization of solar wind electrons. The waves can have rapid
nonlinear interac... | 2104.02824v1 |
2022-11-10 | Intense whistler-mode waves at foreshock transients: characteristics and regimes of wave-particle resonant interaction | Thermalization and heating of plasma flows at shocks result in unstable
charged-particle distributions which generate a wide range of electromagnetic
waves. These waves, in turn, can further accelerate and scatter energetic
particles. Thus, the properties of the waves and their implication for
wave-particle interaction... | 2211.05398v1 |
2023-03-17 | Nonlinear dynamics of small-scale Alfvén waves | We study the nonlinear evolution of very oblique small-scale Alfv\'en waves
with $k_\perp d_i\gtrsim 1$. At these scales, the waves become significantly
compressive, unlike in MHD, due to the Hall term in the equations. We
demonstrate that when frequencies are small compared to the ion gyrofrequency
and amplitudes smal... | 2303.10192v1 |
2004-05-28 | Hyperfine interaction in a quantum dot: Non-Markovian electron spin dynamics | We have performed a systematic calculation for the non-Markovian dynamics of
a localized electron spin interacting with an environment of nuclear spins via
the Fermi contact hyperfine interaction. This work applies to an electron in
the s -type orbital ground state of a quantum dot or bound to a donor impurity,
and is ... | 0405676v2 |
1995-08-16 | Stochastic Particle Acceleration near Accreting Black Holes | We consider the stochastic acceleration of particles which results from
resonant interactions with plasma waves in black hole magnetospheres. We
calculate acceleration rates and escape time scales for protons and electrons
resonating with Alfv\'en waves, and for electrons resonating with whistlers.
Assuming either a Ko... | 9508069v1 |
2005-11-01 | Disk heating by more than one spiral density wave | We consider a differentially rotating, 2D stellar disk perturbed by two
steady state spiral density waves moving at different patterns speeds. Our
investigation is based on direct numerical integration of initially circular
test-particle orbits. We examine a range of spiral strengths and spiral speeds
and show that sta... | 0511037v1 |
2006-04-09 | Three-dimensional strong localization of matter waves by scattering from atoms in a lattice with a confinement-induced resonance | The possibility of using ultracold atoms to observe strong localization of
matter waves is now the subject of a great interest, as undesirable decoherence
and interactions can be made negligible in these systems. It was proposed that
a static disordered potential can be realized by trapping atoms of a given
species in ... | 0604232v2 |
2005-10-28 | Radial disk heating by more than one spiral density wave | We consider a differentially rotating, 2D stellar disk perturbed by two
steady state spiral density waves moving at different patterns speeds. Our
investigation is based on direct numerical integration of initially circular
test-particle orbits. We examine a range of spiral strengths and spiral speeds
and show that sta... | 0510074v1 |
2009-09-27 | Space-time symmetry violation of the fields in quasi-2D ferrite particles with magnetic-dipolar-mode oscillations | In magnetic systems with reduced dimensionality, the effects of dipolar
interactions allow the existence of long-range ordered phases. Long-range
magnetic-dipolar interactions are at the heart of the explanation of many
peculiar phenomena observed in nuclear magnetic resonance, ferromagnetic
resonance, and Bose-Einstei... | 0909.4920v1 |
2015-06-30 | Resonant Absorption of Transverse Oscillations and Associated Heating in a Solar Prominence. I- Observational aspects | Transverse magnetohydrodynamic (MHD) waves have been shown to be ubiquitous
in the solar atmosphere and can in principle carry sufficient energy to
generate and maintain the Sun's million-degree outer atmosphere or corona.
However, direct evidence of the dissipation process of these waves and
subsequent heating has not... | 1506.08965v1 |
2017-11-01 | Realization of a Contactless Acoustic Levitation Motor via Doublet Mode Control and Autoresonance | This paper demonstrates analytically and experimentally an acoustic
levitation motor which has the ability to levitate and rotate an object in the
air without mechanical contact. To realize such a device two core methods are
applied simultaneously; (i) resonance tracking with an Autoresonance feedback
loop, (ii) genera... | 1711.00380v1 |
2018-03-29 | The linear theory of tidally excited spiral density waves: application to CV and circumplanetary disks | We revisit linear tidal excitation of spiral density waves in the disks of
cataclysmic variables (CVs), focusing on scalings with orbital Mach number in
order to bridge the gap between numerical simulations and real systems. If an
inner Lindblad resonance (ILR) lies within the disk, ingoing waves are robustly
excited, ... | 1803.10921v1 |
2019-11-01 | Free and forced wave propagation in beam lattice metamaterials with viscoelastic resonators | Beam lattice materials are characterized by a periodic microstructure
realizing a geometrically regular pattern of elementary cells. In these
microstructured materials, the dispersion properties governing the free dynamic
propagation of elastic waves can be studied by formulating parametric
lagrangian models and applyi... | 1911.00455v1 |
2018-08-14 | Wave propagation in infinite nonlinear acoustic metamaterial beam by considering the third harmonic generation | Nonlinear acoustic metamaterial (NAM) initiates new fields for controlling
elastic waves. In this work, the flexural wave propagation in the half-infinite
NAM beam consisting of periodic Duffing resonators is reported by considering
the third harmonic generation (THG). Different analytical methods are proposed
to descr... | 1808.04682v2 |
2017-06-15 | Resonant drag instability of grains streaming in fluids | We show that grains streaming through a fluid are generically unstable if
their velocity, projected along some direction, matches the phase velocity of a
fluid wave (linear oscillation). This can occur whenever grains stream faster
than any fluid wave. The wave itself can be quite general--sound waves,
magnetosonic wav... | 1706.05020v5 |
2017-10-25 | Electromagnetic waves propagating in the string axiverse | It is widely believed that axions are ubiquitous in string theory and could
be the dark matter. The peculiar features of the axion dark matter are coherent
oscillations and a coupling to the electromagnetic field through the
Chern-Simons term. In this paper, we study consequences of these two features
of the axion with... | 1710.09198v2 |
2017-03-21 | Two-body Wave Functions, Compositeness, And The Internal Structure Of Dynamically Generated Resonances | Recently, the compositeness, defined as the norm of a two-body wave function
for bound and resonance states, has been investigated to discuss the internal
structure of hadrons in terms of hadronic molecular components. From the
studies of the compositeness, it has been clarified that the two-body wave
function of a bou... | 1703.07176v1 |
2019-04-10 | The role of resonance and bandgaps in high $k_\textrm{eff}^2$ transducers | Bandgaps formed in a piezoelectric transducer with large coupling,
$k_\textrm{eff}^2$, qualitatively modify its electrical response. This regime
in which electrical loading strongly couples forward and backward waves occurs
in thin-film lithium niobate which has recently become available and amenable
to nanopatterning.... | 1904.04981v1 |
2019-12-22 | Scattering from compact objects: Regge poles and the complex angular momentum method | We calculate the Regge poles of the scattering matrix for a gravitating
compact body, for scalar fields and for gravitational waves in the axial
sector. For a neutron-starlike body, the spectrum exhibits two distinct
branches of poles, labeled surface waves and broad resonances; for ultracompact
objects, the spectrum a... | 1912.11348v2 |
2022-01-09 | Acoustics of a partially partitioned narrow slit connected to a half-plane: case study for exponential quasi-bound states in the continuum and their resonant excitation | Localised wave oscillations in an open system that do not decay or grow in
time, despite their frequency lying within a continuous spectrum of radiation
modes carrying energy to or from infinity, are known as bound states in the
continuum (BIC). Small perturbations from the typically delicate conditions for
BIC almost ... | 2201.03554v1 |
2023-07-14 | A resonant Lyapunov centre theorem with an application to doubly periodic travelling hydroelastic waves | We present a Lyapunov centre theorem for an antisymplectically reversible
Hamiltonian system exhibiting a nondegenerate $1:1$ or $1:-1$ semisimple
resonance as a detuning parameter is varied. The system can be finite- or
infinite dimensional (and quasilinear) and have a non-constant symplectic
structure. We allow the o... | 2307.07194v1 |
2024-02-27 | A computational method for angle-resolved photoemission spectra from repeated-slab band structure calculations | A versatile method for angle-resolved photoemission spectra (ARPES)
calculations is reported within the one-step model of photoemission. The
initial states are obtained from a repeated-slab calculation using the
projector-augmented wave (PAW) method. ARPES final states are constructed by
matching the repeated-slab eige... | 2402.17199v1 |
2004-12-29 | An analytic study of the gravitational wave pulsar signal with spin down effects | In this work, we present the analytic treatment of the Fourier Transform (FT)
of the Gravitational Wave (GW) signal from a pulsar including spin down
corrections in a parametrized model discussed by Brady et. al. The formalism
lends itself to a development of the FT in terms of well known special
functions and integral... | 0412646v1 |
1992-11-24 | Possible Quantum Spin Liquid States on the Triangular and Kagome Lattices | The frustrated spin-one-half Heisenberg model on triangualr and Kagome
Lattices is mapped onto a single specis of fermion carrying statistical flux.
The corresponding Chern-Simons gauge theory is analyzed at the Gaussian level
and found to be massive. This provides a new motivation for the spin-liquid
Kalmeyer-Laughlin... | 9211017v1 |
1993-10-11 | Half-Integral Spin-Singlet Quantum Hall Effect | We provide numerical evidence that the ground state of a short range
interaction model at $\nu=1/2$ is incompressible and spin-singlet for a wide
range of repulsive interactions. Furthermore it is accurately described by a
trial wave function studied earlier. For the Coulomb interaction we find that
this wave function ... | 9310020v1 |
1994-04-18 | Intensity correlations in electronic wave propagation in a disordered medium: the influence of spin-orbit scattering | We obtain explicit expressions for the correlation functions of transmission
and reflection coefficients of coherent electronic waves propagating through a
disordered quasi-one-dimensional medium with purely elastic diffusive
scattering in the presence of spin-orbit interactions. We find in the metallic
regime both lar... | 9404054v1 |
1997-09-26 | Scaling relation of spin wave lifetime in double-exchange systems | Spin excitation spectrum of CMR manganites are studied from both theoretical
and experimental sides. Scaling relations for the spin wave lifetime in the
electronic model with double-exchange interaction is observed, which is
consistent with results for neutron inelastic scattering experiments for
(La,Y)$_{0.8}$Sr$_{0.2... | 9709294v1 |
1998-03-20 | Transitions between Phases with Equal Wave Numbers in a Double Ising Spin Model. Application to Betaine Calcium Chloride Dihydrate | A Double Ising Spin model for uniaxially structurally modulated materials
exhibits as a special feature phase transitions between phases with equal wave
numbers but different pseudo spin configurations. The character of these
`internal' transitions is investigated in mean field approximation, with the
mean field transf... | 9803252v1 |
1999-04-26 | Magnon Damping by magnon-phonon coupling in Manganese Perovskites | Inelastic neutron scattering was used to systematically investigate the
spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In
spite of the large differences in the Curie temperatures ($T_C$s) of different
manganites, their low-temperature spin waves were found to have very similar
dispersions with ... | 9904372v1 |
1999-07-12 | Quantum Hall Transitions in Field Induced Spin Density Wave Systems | Field Induced Spin Density Wave (FISDW) systems exhibit coexistence phases
between well defined quantum Hall plateau phases with even integers 2N and 2N'.
We show that a disordered coexistence region accounts for the observed peaks in
the longitudinal resistivity as the field varies between plateaux. It also
results in... | 9907170v1 |
1999-07-19 | Spin waves in a two dimensional p-wave superconductor: Sr$_2$RuO$_4$ | We study spin excitations in a two dimensional p-wave superconductor with
${\vec \Delta} = {\hat d}({\hat k}_1 \pm i {\hat k}_2)$ symmetry in the context
of the newly discovered superconducting Sr$_2$RuO$_4$. The polarization and
spectrum of spin wave excitations are identified and their experimental
consequences are d... | 9907276v2 |
2001-05-31 | Phase transition and spin-wave dispersion in quantum Hall bilayers at filling factor nu=1 | We present an effective Hamiltonian for a bilayer quantum Hall system at
filling factor $\nu=1$ neglecting charge fluctuations. Our model is formulated
in terms of spin and pseudospin operators and is an exact representation of the
system within the above approximation. We analyze its low-lying excitations in
terms of ... | 0105625v2 |
2001-08-24 | Influence of disorder on the ferromagnetism in diluted magnetic semiconductors | Influence of disorder on the ferromagnetic phase transition in diluted
(III,Mn)V semiconductors is investigated analytically. The regime of small
disorder is addressed, and the enhancement of the critical temperature by
disorder is found both in the mean field approximation and from the analysis of
the zero temperature... | 0108396v2 |
2001-10-16 | Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets | We study a classical double exchange magnet with direct antiferromagnetic
superexchange coupling, J, between the localized spins. It is shown that the
de-stabilization of the ferromagnetic ground state with increasing J leads to
phase separation; the latter always preempts the spin-wave instability
(softening of the ma... | 0110322v2 |
2002-05-08 | Superconductor-to-Spin-Density-Wave Transition in Quasi-One-Dimensional Metals with Ising Anisotropy | We study a mechanism for superconductivity in quasi-one-dimensional materials
with Ising anisotropy. In an isolated chain Ising anisotropy opens a spin gap;
if inter-chain coupling is sufficiently weak, single particle hopping is
suppressed and the physics of coupled chains is controlled by a competition
between pair h... | 0205166v1 |
2002-09-23 | Rigorous Proof of Pseudospin Ferromagnetism in Two-Component Bosonic Systems with Component-Independent Interactions | For a two-component bosonic system, the components can be mapped onto a
pseudo-spin degree of freedom with spin quantum number S=1/2. We provide a
rigorous proof that for a wide-range of real Hamiltonians with component
independent mass and interaction, the ground state is a ferromagnetic state
with pseudospin fully po... | 0209529v1 |
2003-02-24 | Study of low-energy magnetic excitations in single-crystalline CeIn3 by inelastic neutron scattering | Inelastic neutron scattering experiments were performed on single crystals of
the heavy-fermion compound CeIn$_{3}$ for temperatures below and above the
N\'eel temperature, $T_N$. In the antiferromagnetically ordered phase,
well-defined spin-wave excitations with a bandwidth of 2 meV are observed. The
spin waves coexis... | 0302487v1 |
2003-04-02 | Current-induced transverse spin wave instability in a thin nanomagnet | We show that an unpolarized electric current incident perpendicular to the
plane of a thin ferromagnet can excite a spin-wave instability transverse to
the current direction if source and drain contacts are not symmetric. The
instability, which is driven by the current-induced ``spin-transfer torque'',
exists for one c... | 0304069v2 |
2003-06-30 | A chiral spin liquid wave function and the Lieb-Schulz-Mattis theorem | We study a chiral spin liquid wave function defined as a Gutwziller projected
BCS state with a complex pairing function. After projection, spontaneous
dimerization is found for any odd but finite number of chains, thus satisfying
the Lieb-Schultz-Mattis theorem, whereas for even number of chains there is no
dimerizatio... | 0306732v1 |
2003-07-09 | Photoemission study of the spin-density wave state in thin films of Cr | Angle-resolved photoemission (PE) was used to characterize the spin-density
wave (SDW) state in thin films of Cr grown on W(110). The PE data were analysed
using results of local spin density approximation layer-Korringa-Kohn-Rostoker
calculations. It is shown that the incommensurate SDW can be monitored and
important ... | 0307196v1 |
2004-01-24 | Static and Dynamic Properties of Antiferromagnetic Heisenberg Ladders: Fermionic versus Bosonic Approaches | In terms of spinless fermions via the Jordan-Wigner transformation along a
snake-like path and spin waves modified so as to restore the sublattice
symmetry, we investigate static and dynamic properties of two-leg
antiferromagnetic Heisenberg ladders. The specific heat is finely reproduced by
the spinless fermions, wher... | 0401477v1 |
2004-06-05 | Perturbative calculation of the spin-wave dispersion in a disordered double-exchange model | We study the spin-wave dispersion of localized spins in a disordered
double-exchange model using the perturbation theory with respect to the
strength of the disorder potential. We calculate the dispersion upto the
next-leading order, and extensively examine the case of one-dimension. We show
that in that case, disorder... | 0406134v1 |
2005-04-26 | Spin-Polarized Standing Waves in the Fermi Surface of a Ferromagnetic Thin Film | The spin-selective electron reflection at a ferromagnetic-paramagnetic
interface is investigated using Fe films on a W(110) substrate. Angle-resolved
photoemission of the majority and minority Fermi surfaces of the Fe film is
used to probe standing wave formation. Intense quantum well states resulting
from interfacial ... | 0504670v1 |
2006-06-07 | Pseudogap enhancement due to magnetic impurities in d-density waves | We study the effect of quantum magnetic impurities on d-wave spin density
waves (d-SDW). The impurity spins are aligned coherently according to the spin
space anisotropy of the condensate. Both the order parameter and transition
temperature increases due to the coherent interplay between magnetic scatterers
and d-SDW. ... | 0606176v1 |
2006-09-13 | Spin-wave dispersion in half-doped LaSrNiO | Recent neutron scattering measurements reveal spin and charge ordering in the
half-doped nickelate, La$_{3/2}$ Sr$_{1/2}$ NiO$_4$. Many of the features of
the magnetic excitations have been explained in terms of the spin waves of
diagonal stripes with weak single-ion anisotropy. However, an optical mode
dispersing away... | 0609300v1 |
1999-10-12 | Gravity Waves, Chaos, and Spinning Compact Binaries | Spinning compact binaries are shown to be chaotic in the Post-Newtonian
expansion of the two body system. Chaos by definition is the extreme
sensitivity to initial conditions and a consequent inability to predict the
outcome of the evolution. As a result, the spinning pair will have
unpredictable gravitational waveform... | 9910040v3 |
1994-09-23 | Motion of Spin-1/2 Particles in External Gravitational and Electromagnetic Fields | (Talk presented at the 7th Marcel Grossmann Meeting on General Relativity,
Stanford, CA, July 24-30, 1994) We study the semi-classical limit of the
solution of the Dirac equation in a background electromagnetic/gravitational
plane wave. We show that the exact solution corresponding to an asymptotically
fixed incoming m... | 9409147v1 |
2003-06-28 | On Equations for a Spin-2 Particle in External Gravitational Field | 30-component, of the first order, equation for a spin 2 particle, equivalent
to the second order Pauli-Fierz one, is generalized to presence of an external
electromagnetic field as well as a curved background space-time geometry. The
essential property of the generally covariant wave equation obtained is that
here from... | 0306286v1 |
2004-08-05 | The novel aspect of hydrogen atom: the fine structure and spin can be derived by single component wavefunction | The fine structure of hydrogen energy was calculated by using the usual
momentum-wavefunction relation directly, rather than establishing the
well-known Dirac wave equation. As the results, the energy levels are
completely the same as that of the Dirac wave equation, while the wavefunction
is single component that is q... | 0408025v1 |
2007-06-14 | Spin-waves in a complex magnetic system: nonextensive approach | In this paper we analyze the spin-wave excitations (magnons) of an
inhomogeneous spin system within the Boltzmann-Gibbs framework and then connect
the results with the nonextensive approach (in the sense of Tsallis
statistics). Considering an equivalence between those two frameworks, we could
connect the entropic param... | 0706.2201v2 |
2009-06-30 | Quantum phase transition of the 103mRh spin-density wave | We induce a quantum phase transition of the 103mRh excitation at the critical
density of 10^{12} cm^{-3} by bremsstrahlung pumping at 300 K. A massive 103mRh
spin-density wave carrying a spin current moves on the identical 103Rh matrix
like a quantum fluid. The collapse-and-revival spectral evolution indicates
that the... | 0906.5417v1 |
2009-10-15 | Dixon's extended bodies and impulsive gravitational waves | The "reaction" of an extended body to the passage of an exact plane
gravitational wave is discussed following Dixon's model. The analysis performed
shows several general features, e.g. even if initially absent, the body
acquires a spin induced by the quadrupole structure, the center of mass moves
from its initial posit... | 0910.2846v1 |
2010-11-04 | Spin wave calculation of the field-dependent magnetization pattern around an impurity in Heisenberg antiferromagnets | We consider the magnetic-field dependent spatial magnetization pattern around
a general impurity embedded in a Heisenberg antiferromagnet using both an
analytical and a numerical spin wave approach. The results are compared to
quantum Monte Carlo simulations. The decay of the magnetization pattern away
from the impurit... | 1011.1271v1 |
2010-11-15 | Study of the Spin-weighted Spheroidal Equation in the Case of s=1 | We present series study of using the method of super-symmetric quantum
mechanics(SUSYQM) solving the spin-weighted spheroidal wave equation. In this
paper, we obtain the first four terms of super-potential of the spin-weighted
spheroidal wave equation in the case of s=1. These results may help summary the
general form ... | 1011.4045v1 |
2010-11-19 | Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling | We theoretically describe the spin excitation spectrum of a two dimensional
electron gas embedded in a quantum well with localized magnetic impurities.
Compared to the previous work, we introduce equations that allow to consider
the interplay between the Coulomb interaction of delocalized electrons and the
$sd$ exchang... | 1011.4422v1 |
2011-04-01 | Spin waves cause non-linear friction | Energy dissipation is studied for a hard magnetic tip that scans a soft
magnetic substrate. The dynamics of the atomic moments are simulated by solving
the Landau-Lifshitz-Gilbert (LLG) equation numerically. The local energy
currents are analysed for the case of a Heisenberg spin chain taken as
substrate. This leads to... | 1104.0197v2 |
2011-07-05 | Magnetic field and quark matter in the core | Magnetic properties of quark matter are discussed in the light of the
observation of pulsars. Our works about spontaneous spin polarization and spin
density wave are reviewed and their implications on compact-star phenomena are
discussed. In particular, the former subject may be directly related to the
origin of strong... | 1107.0807v2 |
2011-09-02 | Gravitational Waves and the Maximum Spin Frequency of Neutron Stars | In this Letter we re-examine the idea that gravitational waves are required
as a braking mechanism to explain the observed maximum spin-frequency of
neutron stars. We show that for millisecond X-ray pulsars, the existence of
spin equilibrium as set by the disk/magnetosphere interaction is sufficient to
explain the obse... | 1109.0536v1 |
2011-12-13 | Spectral properties of one-dimensional spiral spin density wave states | We provide a full characterization of the spectral properties of spiral spin
density wave (SSDW) states which emerge in one-dimensional electron systems
coupled to localized magnetic moments or quantum wires with spin-orbit
interactions. We derive analytic results for the spectral function, local
density of states and ... | 1112.3045v2 |
2012-03-07 | Temperature Induced Spin Density Wave in Magnetic Doped Topological Insulators | We study the magnetic properties of topological insulators doped with
isoelectronic magnetic impurities. We obtain that at zero temperature the
impurities order ferromagnetically, but when raising the temperature the
topological insulator undergoes a first order phase transition to a spin
density wave phase before the ... | 1203.1436v2 |
2012-03-13 | Spin induced multipole moments for the gravitational wave amplitude from binary inspirals to 2.5 Post-Newtonian order | Using the NRGR effective field theory formalism we calculate the remaining
source multipole moments necessary to obtain the spin contributions to the
gravitational wave amplitude to 2.5 Post-Newtonian (PN) order. We also
reproduce the tail contribution to the waveform linear in spin at 2.5PN arising
from the nonlinear ... | 1203.2962v2 |
2012-06-15 | Kinks and waterfalls as signatures of competing order in angle-resolved photoemission spectra of La_{2-x}Sr_xCuO_4 | We show that the so-called kinks and waterfalls observed in angle-resolved
photoemission spectra of La2-xSrxCuO4, a prototypical high-Tc superconducting
cuprate, result from the coupling of quasiparticles with two distinct nearly
critical collective modes with finite characteristic wave vectors, typical of
charge and s... | 1206.3427v1 |
2012-12-17 | Electromagnetic soliton-particle with spin and magnetic moment | Electromagnetic soliton-particle with both quasi-static and quick-oscillating
wave parts is considered. Its mass, spin, charge, and magnetic moment appear
naturally when the interaction with distant solitons is considered. The
substantiation of Dirac equation for the wave part of the interacting
soliton-particle is giv... | 1212.4468v1 |
2013-03-31 | Semi classical modeling of isotropic Non-Heisenberg magnets for spin S=1 and linear quadrupole excitation dynamics | In this paper, equations describing one-dimensional Non-Heisenberg model are
studied by use of generalized coherent states in real parameterization and then
dissipative spin wave equation for dipole and quadrupole branches is obtained
if there is a small linear excitation from the ground state. Finally, it is
shown tha... | 1304.0245v1 |
2013-04-02 | Asymptotic spectrum of the oblate spin-weighted spheroidal harmonics: a WKB analysis | Spin-weighted spheroidal harmonics play a central role in the mathematical
description of diverse physical phenomena, including black-hole perturbation
theory and wave scattering. We present a novel and compact derivation of the
asymptotic eigenvalues of these important functions. Our analysis is based on a
simple tric... | 1304.0529v1 |
2013-09-19 | Equivariant and self-similar standing waves for a Hamiltonian hyperbolic-hyperbolic spin-field system | In this paper we study the existence of special symmetric solutions to a
Hamiltonian hyperbolic-hyperbolic coupled spin-field system, where the spins
are maps from $\mathbb R^{2+1}$ into the sphere $\S^2$ or the pseudo-sphere
$\H^2$. This model was introduced in \cite{Martina} and it is also known as the
{\it hyperboli... | 1309.5066v2 |
2013-10-12 | Inversion Phenomena of the Anisotropies of the Hamiltonian and the Wave Function in Quantum Spin Chains | We investigate the inversion phenomena between the XXZ anisotropies of the
Hamiltonian and the wave function in quantum spin chains. We focus on the S=1/2
geometrically frustrated 3-leg ladder system with the XXZ interaction
anisotropy. By use of the degenerate perturbation theory from the strong rung
coupling limit, w... | 1310.3394v1 |
2014-05-07 | Spin structure factor and quantum phases of frustrated spin-1/2 chains | The static structure factor S(q) of frustrated spin-1/2 chains with isotropic
exchange and a singlet ground state (GS) diverges at wave vector q_m when the
GS has quasi-long-range order (QLRO) with periodicity 2\pi/q_m but S(q_m) is
finite in bond-order-wave (BOW) phases with finite-range spin correlations.
Exact diago... | 1405.1578v1 |
2014-08-21 | Scattering by an electromagnetic radiation field | Motion of test particles in the gravitational field associated with an
electromagnetic plane wave is investigated. The interaction with the radiation
field is modeled by a force term {\it \`a la} Poynting-Robertson entering the
equations of motion given by the 4-momentum density of radiation observed in
the particle's ... | 1408.4958v1 |
2014-11-14 | Magnetic order and spin excitations in layered Heisenberg antiferromagnets with compass-model anisotropies | The spin-wave excitation spectrum, the magnetization, and the N\'{e}el
temperature for the quasi-two-dimensional spin-1/2 antiferromagnetic Heisenberg
model with compass-model interaction in the plane proposed for iridates are
calculated in the random phase approximation. The spin-wave spectrum agrees
well with data of... | 1411.3920v2 |
2015-04-03 | Solitons in a continuous classical Haldane-Shastry spin chain | Motivated by Polychronakos' discovery that solitons exist in the hydrodynamic
equations of continuum version of the Calogero model, we seek solitons in the
classical dynamics of a continuum version of the Haldane-Shastry spin chain. We
have obtained analytic multi-lump solitary wave solutions for our spin-field
equatio... | 1504.00873v1 |
2016-01-30 | Low-Temperature Spin-Wave Approximation for the Heisenberg Ferromagnet | We study the low temperature thermodynamics of the quantum Heisenberg
ferromagnet in three dimension for any value of the spin $ S \geq 1/2 $. We
report on a rigorous proof of the validity of the spin-wave approximation for
the excitation spectrum, at the level of the first non-trivial contribution to
the free energy a... | 1602.00155v1 |
2019-09-10 | Enhanced Detectability of Spinning Primordial Black Holes | Primordial black holes which are produced during an epoch of matter
domination are expected to spin rapidly. It is shown that this leads to an
enhancement of the detectability of the stochastic gravitational-wave
background from their mergers. For a specific model, we explicitly demonstrate
that this yields a $50\,\%$ ... | 1909.04742v2 |
2020-07-30 | Derivation of the Half-Wave Maps Equation from Calogero--Moser Spin Systems | We prove that the energy-critical half-wave maps equation \[ \partial_t
\mathbf{S} =\mathbf{S} \times |\nabla| \mathbf{S}, \quad (t,x) \in \mathbb{R}
\times \mathbb{T} \] arises as an effective equation in the continuum limit of
completely integrable Calogero-Moser classical spin systems with inverse square
$1/r^2$ int... | 2007.15323v1 |
2020-12-02 | Effects of exchange distortions in the magnetic Kagome lattice | This study examines the effect of distorted triangular magnetic interactions
in the Kagome lattice. Using a Holstein-Primakoff expansion, we determine the
analytical solutions for classical energies and the spin-wave modes for various
magnetic configurations. By understanding the magnetic phase diagram, we
characterize... | 2012.00910v1 |
2021-01-18 | Quantum fluctuation effects on the ordered Moments in a two dimensional frustrated ferrimagnet | We propose a novel two-dimensional (2D)frustrated quantum spin-1/2
anisotropic Heisenberg model with alternating ferromagnetic and
antiferromagnetic magnetic chains along one direction and antiferromagnetic
interactions along the other. The (mean-field) ground state is ferrimagnetic in
certain range of the interaction ... | 2101.07300v1 |
2021-12-27 | Penrose limit of MNa solution and spin chains in three-dimensional field theories | In three dimensions, a theory with spontaneous breaking of supersymmetry was
described holographically by the Maldacena-Nastase (MNa) solution. We revisit
the issue of its Penrose limit, and compare the resulting pp wave and its
string eigenstates to a sector of the theory on 5-branes reduced on $S^3$, and
a spin chain... | 2112.13802v2 |
2022-04-19 | Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation | Single crystal elastic and inelastic neutron scattering experiments are
performed on the frustrated ferro-antiferromagnet SrZnVO(PO4)2 in high magnetic
fields. The fully polarized state, the presaturation phase and the
columnar-antiferromagnetic phase just bellow the presaturation phase were
investigated. The observed ... | 2204.08778v2 |
2023-03-20 | Electron Wave Spin in Excited States | The wave spin of an electron can be fully characterized by the current
density calculated from the exact four-spinor solution of the Dirac equation.
In the excited states of the electron in a magnetic field-free quantum well,
the current density has a multiple vortex topology. The interaction of the
current with a magn... | 2303.10855v1 |
2023-09-09 | Teukolsky-like equations with various spins in spherically symmetric spacetime | We study the wave equations with various spins on the background of the
general spherically symmetric spacetime. We obtain the unified expression of
the Teukolsky-like master equations and the corresponding radial equations with
the general spins. We also discuss the gauge dependence in the
gravitational-wave equations... | 2309.04758v2 |
2015-12-24 | Shedding Light on Diphoton Resonances | The experimental and theoretical implications of heavy digauge boson
resonances that couple to, or are comprised of, new charged and strongly
interacting matter are investigated. Observation and measurement of ratios of
the resonant digauge boson channels $WW$, $ZZ$, $\gamma \gamma$, $Z \gamma$,
and $gg$ in the form of... | 1512.07733v3 |
2008-05-05 | On-chip Integration of High-Frequency Electron Paramagnetic Resonance Spectroscopy and Hall-Effect Magnetometry | A sensor that integrates high sensitivity micro-Hall effect magnetometry and
high-frequency electron paramagnetic resonance spectroscopy capabilities on a
single semiconductor chip is presented. The Hall-effect magnetometer was
fabricated from a two dimensional electron gas GaAs/AlGaAs heterostructure in
the form of a ... | 0805.0565v1 |
2021-07-12 | Avalanches and many-body resonances in many-body localized systems | We numerically study both the avalanche instability and many-body resonances
in strongly-disordered spin chains exhibiting many-body localization (MBL). We
distinguish between a finite-size/time MBL regime, and the asymptotic MBL
phase, and identify some "landmarks" within the MBL regime. Our first landmark
is an estim... | 2107.05642v3 |
1998-10-14 | Spin relaxation in Mn12-acetate | We present a comprehensive derivation of the magnetization relaxation in a
Mn12-acetate crystal based on thermally assisted spin tunneling induced by
quartic anisotropy and weak transverse magnetic fields. The overall relaxation
rate as function of the magnetic field is calculated and shown to agree well
with data incl... | 9810156v3 |
2000-02-01 | Resonant Spin Excitation in an Overdoped High Temperature Superconductor | An inelastic neutron scattering study of overdoped Bi_2Sr_2CaCu_2O_{8+\delta}
$ (T_c = 83 K) has revealed a resonant spin excitation in the superconducting
state. The mode energy is E_res=38 meV, significantly lower than in optimally
doped Bi_2Sr_2CaCu_2O_{8+\delta} (T_c = 91 K, E_ res =43 meV). This
observation, which... | 0002013v3 |
2000-09-05 | Where is the pi particle? | We discuss the interplay of particle-particle and particle-hole spin-triplet
channels in high-T_c superconductors using a quasiparticle dispersion motivated
by angle-resolved photoemission. Within a generalized RPA, we find a well
defined antibound state of two holes, the pi resonance of Demler and Zhang, as
well as a ... | 0009072v1 |
2005-07-29 | Resonant Pair Exchange and Percolation in the Disordered Hubbard Model | We show that the effect of disorder on a Mott-Hubbard insulator of
interacting electrons produces a quantum phase transition from an
antiferromagnetic to a paramagnetic phase governed by a percolation of the
singly occupied weakly disordered sites. Near the transition, we propose that a
new type of defect, formed by th... | 0507701v1 |
1998-12-16 | Effects of magnetohydrodynamics matter density fluctuations on the solar neutrino resonant spin-flavor precession | Taking into account the stringent limits from helioseismology observations on
possible matter density fluctuations described by magnetohydrodynamics theory,
we find the corresponding time variations of solar neutrino survival
probability due to the resonant spin-flavor precession phenomenon with
amplitude of order O(10... | 9812390v1 |
1999-06-28 | Influence of Non-Resonant Effects on the Dynamics of Quantum Logic Gates at Room Temperature | We study numerically the influence of non-resonant effects on the dynamics of
a single $\pi$-pulse quantum CONTROL-NOT (CN) gate in a macroscopic ensemble of
fo ur-spin molecules at room temperature. The four nuclear spins in each
molecule r epresent a four-qubit register. The qubits are ``labeled'' by the
characterist... | 9906109v1 |
2007-10-22 | Microwave band on-chip coil technique for single electron spin resonance in a quantum dot | Microwave band on-chip microcoils are developed for the application to single
electron spin resonance measurement with a single quantum dot. Basic properties
such as characteristic impedance and electromagnetic field distribution are
examined for various coil designs by means of experiment and simulation. The
combined ... | 0710.3986v2 |
2008-10-10 | Deciphering the spin of new resonances in Higgsless models | We study the potential of the CERN Large Hadron Collider (LHC) to probe the
spin of new massive vector boson resonances predicted by Higgsless models. We
consider its production via weak boson fusion which relies only on the coupling
between the new resonances and the weak gauge bosons. We show that the LHC will
be abl... | 0810.1952v3 |
2009-01-31 | Density of States in the Magnetic Ground State of the Friedel-Anderson Impurity | By applying a magnetic field whose Zeeman energy exceeds the Kondo energy by
an order of magnitude the ground state of the Friedel-Anderson impurity is a
magnetic state. In recent years the author introduced the Friedel Artificially
Inserted Resonance (FAIR) method to investigate impurity properties. Within
this FAIR a... | 0902.0033v1 |
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