publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2013-11-21 | Wave patterns generated by a flow of two-component Bose-Einstein condensate with spin-orbit interaction past a localized obstacle | It is shown that spin-orbit interaction leads to drastic changes in wave
patterns generated by a flow of two-component Bose-Einstein condensate (BEC)
past an obstacle. The combined Rashba and Dresselhaus spin-orbit interaction
affects in different ways two types of excitations---density and polarization
waves---which c... | 1311.5387v1 |
2013-12-19 | Gravitational waves from spinning compact object binaries: New post-Newtonian results | We report on recent results obtained in the post-Newtonian framework for the
modelling of the gravitational waves emitted by binary systems of spinning
compact objects (black holes and/or neutron stars). These new results are
obtained at the spin-orbit (linear-in-spin) level and solving Einstein's field
equations itera... | 1312.5375v1 |
2014-02-25 | Linear spin wave theory for single-Q incommensurate magnetic structures | Linear spin wave theory provides the leading term in the calculation of the
excitation spectra of long-range ordered magnetic systems as a function of
$1/\sqrt{S}$. This term is acquired using the Holstein-Primakoff approximation
of the spin operator and valid for small $\delta S$ fluctuations of the ordered
moment. We... | 1402.6069v4 |
2015-04-01 | Direct observation and imaging of a spin-wave soliton with $p-$like symmetry | The prediction and realization of magnetic excitations driven by electrical
currents via the spin transfer torque effect, enables novel magnetic
nano-devices where spin-waves can be used to process and store information. The
functional control of such devices relies on understanding the properties of
non-linear spin-wa... | 1504.00144v1 |
2015-05-07 | Flat-band ferromagnetism in a topological Hubbard model | We study the flat-band ferromagnetic phase of a topological Hubbard model
within a bosonization formalism and, in particular, determine the spin-wave
excitation spectrum. We consider a square lattice Hubbard model at 1/4-filling
whose free-electron term is the \pi-flux model with topologically nontrivial
and nearly fla... | 1505.01685v1 |
2015-08-09 | Spin contamination and noncollinearity in general complex Hartree-Fock wave functions | An expression for the square of the spin operator expectation value,
\textless{} S^2\textgreater{}, is obtained for a general complex Hartree-Fock
(GCHF) wave function and decomposed into four contributions: The main one whose
expression is formally identical to the restricted (open-shell) Hartree-Fock
expression. A sp... | 1508.02058v2 |
2017-12-09 | Magnonic waveguide based on exchange-spring magnetic structure | We propose to use a soft/hard exchange-spring coupling bilayer magnetic
structure to introduce a narrow channel for spin-wave propagation. We show by
micromagnetic simulations that broad-band Damon-Eshbach geometry spin waves can
be strongly localized into the channel and propagate effectively with a proper
high group ... | 1712.03392v1 |
2018-07-30 | Topological spin excitations in honeycomb ferromagnet CrI$_3$ | In two dimensional honeycomb ferromagnets, bosonic magnon quasiparticles
(spin waves) may either behave as massless Dirac fermions or form topologically
protected edge states. The key ingredient defining their nature is the
next-nearest neighbor Dzyaloshinskii-Moriya (DM) interaction that breaks the
inversion symmetry ... | 1807.11452v3 |
2018-02-26 | Unusual spin-wave dynamics in core-shell magnetic nanodisks | We investigated the spin dynamics of a vortex state in a core-shell magnetic
nanodisk driven by an oscillating field applied perpendicular to the disk plane
by means of micromagnetic simulations. The nanodisk comprises a Py (Fe0.2Ni0.8)
core of 100 nm in radius, surrounded by a 50 nm thick Fe shell. Fourier
transform a... | 1802.09181v1 |
2018-12-20 | Tunable Angle Dependent Magnetization Dynamics in Ni80Fe20 Nano-cross Structures of Varying Size | We demonstrate a large angular dependence of magnetization dynamics in
Ni80Fe20 nano-cross arrays of varying sizes. By subtle variation of the
azimuthal angle of an in-plane bias magnetic field, the spin configuration and
the ensuing spin-wave dynamics, including mode softening, mode splitting, mode
crossover and mode ... | 1812.08393v1 |
2016-12-08 | Damped spin-wave excitations in the itinerant antiferromagnet $γ$-Fe$_{0.7}$Mn$_{0.3}$ | The collective spin-wave excitations in the antiferromagnetic state of
$\gamma$-Fe$_{0.7}$Mn$_{0.3}$ were investigated using the inelastic neutron
scattering technique. The spin excitations remain isotropic up to the high
excitation energy, ${\hbar\omega}= 78$ meV. The excitations gradually become
broad and damped abov... | 1612.02515v2 |
2017-02-26 | Magnon-photon coupling in antiferromagnets | Magnon-photon coupling in antiferromagnets has many attractive features that
do not exist in ferro- or ferrimagnets. We show quantum-mechanically that, in
the absence of an external field, one of the two degenerated spin wave bands
couples with photons while the other does not. The photon mode anticrosses with
the coup... | 1702.07977v1 |
2017-06-02 | Coherent Terahertz Spin-Wave Emission Associated with Ferrimagnetic Domain Wall Dynamics | We theoretically study the dynamics of ferrimagnetic domain walls in the
presence of Dzyaloshinskii-Moriya interaction. We find that an application of a
DC magnetic field can induce terahertz spin-wave emission by driving
ferrimagnetic domain walls, which is not possible for ferromagnetic or
antiferromagnetic domain wa... | 1706.00549v1 |
2021-08-08 | Shock-wave-like emission of spin waves induced by interfacial Dzyaloshinskii-Moriya interaction | We investigated spin wave (SW) propagation and emission in thin film systems
with strong interfacial Dzyaloshinskii-Moriya interaction (DMI) utilizing
micromagnetic simulation. The effect of DMI on SW propagation is analogous to
the flow of magnetic medium leading to the spin Doppler effect, and a
spin-polarized curren... | 2108.03686v1 |
2019-10-25 | Nutation Wave as a Platform for Ultrafast Spin Dynamics in Ferromagnets | At short time scales the inertia term becomes relevant for the magnetization
dynamics of ferromagnets and leads to nutation for the magnetization vector.
For the case of spatially extended magnetic systems, for instance Heisenberg
spin chains with isotropic spin-exchange interaction, this leads to the
appearance of a n... | 1910.11897v3 |
2020-05-21 | Non-Hermitian coherent coupling of nanomagnets by exchange spin waves | Non-Hermitian physics has recently attracted much attention in optics and
photonics. Less explored is non-Hermitian magnonics that provides opportunities
to take advantage of the inevitable dissipation of magnons or spin waves in
magnetic systems. Here we demonstrate non-Hermitian coherent coupling of two
distant nanom... | 2005.10452v1 |
2020-05-22 | Dipolar spin waves in uniaxial easy-axis antiferromagnets: A natural topological nodal-line semimetal | The existence of the magnetostatic surface spin waves in ferromagnets, known
as Damon-Eshbach mode, was recently demonstrated to originate from the topology
of the dipole-dipole interaction. In this work, we study the topological
characteristics of magnons in easy-axis antiferromagnets with uniaxial
anisotropy. The dip... | 2005.10971v1 |
2023-04-21 | Magnetic Structures and Spin-wave Excitations in Rare-Earth Iron Garnets near the Compensation Temperature | We introduce a simple model for the ferrimagnetic non-collinear ``magnetic
umbrella" states of rare-earth iron garnets (REIG), common when the rare-earth
moments have non-zero orbital angular momentum. The spin-wave excitations are
calculated within linear spin wave theory and temperature effects via
mean-field theory.... | 2304.10695v1 |
2023-10-01 | Spin and orbital angular momenta of electromagnetic waves in classical and quantum electrodynamics | A plane, monochromatic electromagnetic wave propagating in free space can
have a certain amount of spin angular momentum but cannot possess any orbital
angular momentum. Even the spin angular momentum of the plane-wave is difficult
to evaluate without resort to certain mathematical limit arguments. Both spin
and orbita... | 2310.00575v1 |
2024-01-16 | Spin Waves in Ferrimagnets near the Angular Magnetization Compensation Temperature: A Micromagnetic Study | Spin wave propagation along a ferrimagnetic strip with out-of-plane
magnetization is studied by means of micromagnetic simulations. The
ferrimagnetic material is considered as formed by two antiferromagnetically
coupled sublattices. Two critical temperatures can be defined for such systems:
that of magnetization compen... | 2401.08235v1 |
2011-05-25 | Gravito-electromagnetic resonances | The interaction between gravitational and electromagnetic radiation has a
rather long research history. It is well known, in particular, that
gravity-wave distortions can drive propagating electromagnetic signals. Since
forced oscillations provide the natural stage for resonances to occur,
gravito-electromagnetic reson... | 1105.5103v2 |
2018-03-30 | Ioffe-Regel criterion of Anderson localization in the model of resonant point scatterers | We establish a phase diagram of a model in which scalar waves are scattered
by resonant point scatterers pinned at random positions in the free
three-dimensional (3D) space. A transition to Anderson localization takes place
in a narrow frequency band near the resonance frequency provided that the
number density of scat... | 1803.11479v2 |
2016-12-28 | Temporal Solitons in Microresonators driven by Optical Pulses | Continuous-wave laser driven Kerr-nonlinear, optical microresonators have
enabled a variety of novel applications and phenomena including the generation
of optical frequency combs, ultra-low noise microwaves, as well as, ultra-short
optical pulses. In this work we break with the paradigm of the continuous-wave
optical ... | 1612.08993v1 |
2019-08-06 | Mitigation of seismic waves: metabarriers and metafoundations bench tested | The article analyses two potential metamaterial designs, the metafoundation
and the metabarrier, capable to attenuate seismic waves on buildings or
structural components in a frequency band between 3.5 to 8 Hz. The
metafoundation serves the dual purpose of reducing the seismic response and
supporting the superstructure... | 1908.02056v2 |
2020-01-28 | A Self-Matched Leaky-Wave Antenna for Ultrahigh-Field MRI with Low SAR | The technology of magnetic resonance imaging is developing towards higher
magnetic fields to improve resolution and contrast. However, whole-body imaging
at 7 T or even higher fields remains challenging due to wave interference,
tissue inhomogneities and high RF power deposition. Nowadays, proper RF
excitation of a hum... | 2001.10410v1 |
2021-03-06 | The Solution of the Long-Wave Equation for Various Nonlinear Depth and Breadth Profiles in the Power-Law Form | Long waves bring many important challenges in the ocean and coastal
engineering, including but are not limited to harbor resonance and run-up.
Therefore, understanding and modeling their dynamics is crucially important.
Although their dynamics over various types of geometries are well-studied in
the literature, the stu... | 2103.04153v2 |
2023-09-12 | Non-reciprocal absorption and zero reflection in physically separated dual photonic resonators by traveling-wave-induced indirect coupling | We experimentally explored novel behaviors of non-reciprocal absorption and
almost zero reflection in a dual photon resonator system, which is physically
separated and composed of two inverted split ring resonators (ISRRs) with
varying inter-distances. We also found that an
electromagnetically-induced-transparency (EIT... | 2309.06035v1 |
2001-04-25 | Electron Spin Resonance of Ni-doped CuGeO$_3$ in the paramagnetic, spin-Peierls and antiferromagnetic states: Comparison with non-magnetic impurities | We have performed Electron Spin Resonance measurements on single crystals of
the doped spin-Peierls compounds CuGe$_{1-y}$Si$_y$O$_3$ and
Cu$_{1-x}$M$_x$GeO$_3$ with M = Zn, Mg, Ni ($x, y\leq 0.1$). The first part of
our experiments was performed in the paramagnetic and spin-Peierls phases at
9.5, 95 and 190 GHz. All n... | 0104498v2 |
2012-10-10 | Bodily tides near the 1:1 spin-orbit resonance. Correction to Goldreich's dynamical model | Spin-orbit coupling is often described in the "MacDonald torque" approach
which has become the textbook standard. Within this method, a concise
expression for the additional tidal potential, derived by MacDonald (1964; Rev.
Geophys. 2, 467), is combined with an assumption that the Q factor is
frequency-independent (i.e... | 1210.2923v3 |
2021-08-02 | Dynamics of Colombo's Top: Tidal Dissipation and Resonance Capture, With Applications to Oblique Super-Earths, Ultra-Short-Period Planets and Inspiraling Hot Jupiters | We present a comprehensive theoretical study on the spin evolution of a
planet under the combined effects of tidal dissipation and gravitational
perturbation from an external companion. Such a "spin + companion" system
(called Colombo's top) appears in many [exo]planetary contexts. The competition
between the tidal tor... | 2108.01082v2 |
1998-02-13 | The Matrix Product Approach to Quantum Spin Ladders | We present a manifestly rotational invariant formulation of the matrix
product method valid for spin chains and ladders. We apply it to 2 legged spin
ladders with spins 1/2, 1 and 3/2 and different magnetic structures labelled by
the exchange coupling constants, which can be ferromagnetic or
antiferromagnetic along the... | 9802150v1 |
2001-07-02 | Thermodynamics and Spin Tunneling Dynamics in Ferric Wheels with Excess Spin | We study theoretically the thermodynamic properties and spin dynamics of a
class of magnetic rings closely related to ferric wheels, antiferromagnetic
ring systems, in which one of the Fe (III) ions has been replaced by a dopant
ion to create an excess spin. Using a coherent-state spin path integral
formalism, we deriv... | 0107025v1 |
2003-03-10 | Rashba-effect-induced spin dephasing in n-typed InAs quantum wells | We perform a many-body investigation of the spin dephasing in $n$-typed InAs
quantum wells under moderate magnetic fields in the Voigt configuration by
constructing and numerically solving the kinetic Bloch equations. We obtain the
spin dephasing time due to the Rashba effect together with the spin conserving
scatterin... | 0303169v1 |
2005-09-05 | Spin dynamics in HTSC cuprates: The singlet--correlated band (or t-J-V) model and its applications | So far calculations of the spin susceptibility in the superconducting state
of cuprates have been performed in the framework of weak-coupling
approximations. However, it is known that cuprates belong to Mott-Hubbard doped
materials where electron correlations are important. In this paper an
analytical expression for th... | 0509110v1 |
2005-11-16 | Magnetization and spin-spin energy diffusion in the XY model: a diagrammatic approach | It is shown that the diagrammatic cluster expansion technique for equilibrium
averages of spin operators may be straightforwardly extended to the calculation
of time-dependent correlation functions of spin operators. We use this
technique to calculate exactly the first two non-vanishing moments of the
spin-spin and ene... | 0511399v1 |
2007-01-25 | Polynomially scaling spin dynamics simulation algorithm based on adaptive state space restriction | The conventional spin dynamics simulations are performed in direct products
of state spaces of individual spins. In a general system of n spins, the total
number of elements in the state basis is >4^n. A system propagation step
requires an action by an operator on the state vector and thus requires >4^2n
multiplication... | 0701294v1 |
2008-01-07 | Magnetization reversal driven by spin-injection : a mesoscopic spin-transfer effect | A mesoscopic description of spin-transfer effect is proposed, based on the
spin-injection mechanism occurring at the junction with a ferromagnet. The
effect of spin-injection is to modify locally, in the ferromagnetic
configuration space, the density of magnetic moments. The corresponding
gradient leads to a current-de... | 0801.1019v1 |
2008-04-09 | Quenching Spin Decoherence in Diamond through Spin Bath Polarization | We experimentally demonstrate that the decoherence of a spin by a spin bath
can be completely eliminated by fully polarizing the spin bath. We use electron
paramagnetic resonance at 240 gigahertz and 8 Tesla to study the spin coherence
time $T_2$ of nitrogen-vacancy centers and nitrogen impurities in diamond from
room ... | 0804.1537v1 |
2008-07-04 | Quantum interference and spin polarization on Rashba double quantum dots | We report on the quantum interference and spin accumulation on double quantum
dots with Rashba spin-orbit coupling and electron-electron interaction, based
on the Keldysh nonequilibrium Green function formalism. It is shown that Rashba
spin-orbit interaction can strongly affect the conductance spectrum. By
gradually in... | 0807.0670v1 |
2008-09-23 | Electrical detection of spin pumping: dc voltage generated by ferromagnetic resonance at ferromagnet/nonmagnet contact | We describe electrical detection of spin pumping in metallic nanostructures.
In the spin pumping effect, a precessing ferromagnet attached to a normal-metal
acts as a pump of spin-polarized current, giving rise to a spin accumulation.
The resulting spin accumulation induces a backflow of spin current into the
ferromagn... | 0809.3859v1 |
2009-04-03 | Ultrafast optical spin echo for electron spins in semiconductors | Spin-based quantum computing and magnetic resonance techniques rely on the
ability to measure the coherence time, T2, of a spin system. We report on the
experimental implementation of all-optical spin echo to determine the T2 time
of a semiconductor electron-spin system. We use three ultrafast optical pulses
to rotate ... | 0904.0632v1 |
2009-06-19 | Spin Filtering in a Nonuniform Quantum Wire with Rashba Spin-Orbit Interaction | We investigate theoretically the spin-polarized electron transport for a
wide-narrow-wide (WNW) quantum wire under the modulation of Rashba spin-orbit
interaction (SOI). The influence of both the structure of the quantum wire and
the interference between different pairs of subbands on the spin-polarized
electron transp... | 0906.3561v1 |
2009-09-14 | "Listening" to the spin noise of conduction electrons in bulk n:GaAs | We report a comprehensive study of stochastic electron spin fluctuations --
spin noise -- in lightly doped ($n$-type) bulk GaAs, which are measured using
sensitive optical magnetometry based on off-resonant Faraday rotation.
Frequency spectra of electron spin noise are studied as a function of electron
density, magneti... | 0909.2680v1 |
2010-08-11 | Gaussian approximation and single-spin measurement in OSCAR MRFM with spin noise | A promising technique for measuring single electron spins is magnetic
resonance force microscopy (MRFM), in which a microcantilever with a permanent
magnetic tip is resonantly driven by a single oscillating spin. If the quality
factor of the cantilever is high enough, this signal will be amplified over
time to the poin... | 1008.2012v1 |
2011-01-18 | Generating Entanglement and Squeezed States of Nuclear Spins in Quantum Dots | Entanglement generation and detection are two of the most sought-after goals
in the field of quantum control. Besides offering a means to probe some of the
most peculiar and fundamental aspects of quantum mechanics, entanglement in
many-body systems can be used as a tool to reduce fluctuations below the
standard quantu... | 1101.3370v2 |
2011-02-17 | Designing spin-spin interactions with one and two dimensional ion crystals in planar micro traps | We discuss the experimental feasibility of quantum simulation with trapped
ion crystals, using magnetic field gradients. We describe a micro structured
planar ion trap, which contains a central wire loop generating a strong
magnetic gradient of about 20 T/m in an ion crystal held about 160 \mu m above
the surface. On t... | 1102.3645v2 |
2011-04-19 | Spin relaxation mechanism in Silver nanowires covered with MgO protection layer | Spin-flip mechanism in Ag nanowires with MgO surface protection layers has
been investigated by means of nonlocal spin valve measurements using
Permalloy/Ag lateral spin valves. The spin flip events mediated by surface
scattering are effectively suppressed by the MgO capping layer. The spin
relaxation process was found... | 1104.3718v2 |
2011-05-13 | Consistent interactions for high-spin fermion fields | We address the issue of consistent interactions for off-shell fermion fields
of arbitrary spin. These interactions play a crucial role in the quantum
hadrodynamical description of high-spin baryon resonances in hadronic
processes. The Rarita-Schwinger description of high-spin fermion fields
involves unphysical degrees ... | 1105.2688v3 |
2011-09-03 | Measurement of heavy-hole spin dephasing in (InGa)As quantum dots | We measure the spin dephasing of holes localized in self-assembled (InGa)As
quantum dots by spin noise spectroscopy. The localized holes show a distinct
hyperfine interaction with the nuclear spin bath despite the p-type symmetry of
the valence band states. The experiments reveal a short spin relaxation time
{\tau}_{fa... | 1109.0610v2 |
2011-09-18 | Nuclear Spin Dynamics of Ionized Phosphorus Donors in Silicon | We demonstrate the coherent control and electrical readout of the nuclear
spins of ionized phosphorus donors in natural silicon. By combining pulsed
illumination with coherent electron spin manipulation, we selectively ionize
the donor depending on its nuclear spin state, exploiting a spin-dependent
recombination proce... | 1109.3864v2 |
2011-11-15 | Spin Coherence During Optical Excitation of a Single NV Center in Diamond | We examine the quantum spin state of a single nitrogen-vacancy (NV) center in
diamond at room temperature as it makes a transition from the orbital
ground-state (GS) to the orbital excited-state (ES) during non-resonant optical
excitation. While the fluorescence read-out of NV-center spins relies on
conservation of the... | 1111.3687v1 |
2012-03-26 | Measuring central-spin interaction with a spin bath by pulsed ENDOR: Towards suppression of spin diffusion decoherence | We present pulsed electron-nuclear double resonance (ENDOR) experiments which
enable us to characterize the coupling between bismuth donor spin qubits in Si
and the surrounding spin bath of 29Si impurities which provides the dominant
decoherence mechanism (nuclear spin diffusion) at low temperatures (< 16 K).
Decouplin... | 1203.5607v4 |
2012-04-29 | Sensing remote nuclear spins | Sensing single nuclear spins is a central challenge in magnetic resonance
based imaging techniques. Although different methods and especially diamond
defect based sensing and imaging techniques in principle have shown sufficient
sensitivity, signals from single nuclear spins are usually too weak to be
distinguished fro... | 1204.6513v1 |
2013-02-19 | Optical spin orientation and depolarization in Ge | Optical spin orientation and depolarization phenomena in semiconductors are
of overwhelming importance for the development of spin-optoelectronics. In this
paper we employ Ge-based spin-photodiodes to investigate the room temperature
spectral dependence of optical spin orientation in Germanium, in the range
400-1550 nm... | 1302.4675v1 |
2013-02-27 | Optimization of the yttrium iron garnet/platinum interface for spin pumping-based applications | The dependence of the spin pumping efficiency and the spin mixing conductance
on the surface processing of yttrium iron garnet (YIG) before the platinum (Pt)
deposition has been investigated quantitatively. The ferromagnetic resonance
driven spin pumping injects a spin polarized current into the Pt layer, which
is tran... | 1302.6697v1 |
2013-06-11 | Decay of spin coherences in one-dimensional spin systems | Strategies to protect multi-qubit states against decoherence are difficult to
formulate because of their complex many-body dynamics. A better knowledge of
the decay dynamics would help in the construction of decoupling control
schemes. Here we use solid-state nuclear magnetic resonance techniques to
experimentally inve... | 1306.2620v1 |
2014-03-03 | Faraday rotation echo spectroscopy and detection of quantum fluctuations | Central spin decoherence is useful for detecting many-body physics in
environments and moreover, the spin echo control can remove the effects of
static thermal fluctuations so that the quantum fluctuations are revealed. The
central spin decoherence approach, however, is feasible only in some special
configurations and ... | 1403.0420v1 |
2014-03-27 | Resonant optical control of the electrically-induced spin polarization by periodic excitation | We show that the electron spin polarization generated by an electrical
current may have its direction controlled and magnitude amplified by periodic
optical excitation. The electrical and optical spin control methods were
combined and implemented in a two-dimensional electron gas. By Kerr rotation in
an external transv... | 1403.7176v2 |
2014-04-23 | Semiclassical spin-spin dynamics and feedback control in transport through a quantum dot | We present a theory of magnetotransport through an electronic orbital, where
the electron spin interacts with a (sufficiently) large external spin via an
exchange interaction. Using a semiclassical approximation, we derive a set of
equations of motions for the electron density matrix and the mean value of the
external ... | 1404.5831v3 |
2014-05-07 | Probing individual split Cooper-pairs using the spin qubit toolkit | A superconductor is a natural source of spin-entangled spatially separated
electron pairs. Although the first Cooper-pair splitter devices have been
realized recently, an experimental confirmation of the spin state and the
entanglement of the emitted electron pairs is lacking up to now. In this paper
a method is propos... | 1405.1567v1 |
2014-10-22 | Spin current generation from sputtered Y3Fe5O12 films | Spin current injection from sputtered yttrium iron garnet (YIG) films into an
adjacent platinum layer has been investigated by means of the spin pumping and
the spin Seebeck effects. Films with a thickness of 83 and 96 nanometers were
fabricated by on-axis magnetron rf sputtering at room temperature and
subsequent post... | 1410.5987v1 |
2014-11-12 | Dependence of the Efficiency of Spin Hall Torque on the Transparency of Pt-Ferromagnetic Layer Interfaces | We report that spin current transport across Pt-ferromagnet (FM) interfaces
is strongly dependent on the type and the thickness of the FM layer and on
post-deposition processing protocols. By employing both harmonic voltage
measurements and spin-torque ferromagnetic resonance measurements, we find that
the efficiency o... | 1411.3379v1 |
2014-11-19 | Dynamical spin injection at a quasi-one-dimensional ferromagnet-graphene interface | We present a study of dynamical spin injection from a three-dimensional
ferromagnet into two-dimensional single-layer graphene. Comparative
ferromagnetic resonance (FMR) studies of ferromagnet/graphene strips buried
underneath the central line of a coplanar waveguide show that the FMR linewidth
broadening is the larges... | 1411.5339v2 |
2015-03-26 | Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effect | The spin dynamics of the strongly localized, donor-bound electrons in
fluorine-doped ZnSe epilayers is studied by pump-probe Kerr rotation
techniques. A method exploiting the spin inertia is developed and used to
measure the longitudinal spin relaxation time, $T_1$, in a wide range of
magnetic fields, temperatures, and... | 1503.07684v1 |
2016-08-01 | Extended pump-probe Faraday rotation spectroscopy of the submicrosecond electron spin dynamics in n-type GaAs | We develop an extended pump-probe Faraday rotation technique to study the
submicrosecond electron spin dynamics with picosecond time resolution in a wide
range of magnetic fields. The electron spin dephasing time $T_2^*$ and the
longitudinal spin relaxation time $T_1$, both approaching $250$ ns in weak
fields, are meas... | 1608.00314v4 |
2016-09-24 | Field-like spin orbit torque in ultra-thin polycrystalline FeMn films | Field-like spin orbit torque in FeMn/Pt bilayers with ultra-thin
polycrystalline FeMn has been characterized through planar Hall effect
measurements. A large effective field is obtained for FeMn in the thickness
range of 2 to 5 nm. The experimental observations can be reasonably accounted
for by using a macro-spin mode... | 1609.07564v1 |
2016-10-22 | Enhanced spin-orbit torque via modulation of spin current absorption | The magnitude of spin-orbit torque (SOT), exerted to a ferromagnet (FM) from
an adjacent heavy metal (HM), strongly depends on the amount of spin currents
absorbed in the FM. We exploit the large spin absorption at the Ru interface to
manipulate the SOTs in HM/FM/Ru multilayers. While the FM thickness is smaller
than i... | 1610.06989v1 |
2017-07-09 | Nuclear spin cooling by helicity-alternated optical pumping at weak magnetic fields in $n$-GaAs | The spin dynamics of localized donor-bound electrons interacting with the
nuclear spin ensemble in $n$-doped GaAs epilayers is studied using nuclear spin
polarization by light with modulated circular polarization. We show that the
observed build-up of the nuclear spin polarization is a result of competition
between nuc... | 1707.02658v2 |
2017-09-18 | Spin-selectable, region-tunable negative differential resistance in graphene double ferromagnetic barriers | We propose a graphene device that can generate spin-dependent negative
differential resistance (NDR). The device is composed of a sufficiently wide
and short graphene and two gated EuO strips deposited on top of it. This scheme
avoids graphene edge tailors required by previous proposals. More importantly,
we find clear... | 1709.06038v2 |
2018-06-08 | Optically-detected long-lived spin coherence in multilayer systems: Double and triple quantum wells | In this contribution, we investigated the spin coherence of high-mobility
dense two-dimensional electron gases confined in multilayer systems. The
dynamics of optically-induced spin polarization was experimentally studied
employing the time-resolved Kerr rotation and resonant spin amplification
techniques. For both the... | 1806.03092v1 |
2018-10-26 | Superfluid Transport in Quantum Spin Chains | Spin superfluids enable long-distance spin transport through classical
ferromagnets by developing topologically stable magnetic textures. For small
spins at low dimensions, however, the topological protection suffers from
strong quantum fluctuations. We study the remanence of spin superfluidity
inherited from the class... | 1810.11470v1 |
2019-06-07 | Angle resolved relaxation of spin currents by antiferromagnets in spin valves | We observe and analyze tunable relaxation of a pure spin current by an
antiferromagnet in spin-valves. This is achieved by carefully controlling the
angle between a resonantly excited ferromagnetic layer pumping the spin current
and the N\'eel vector of the antiferromagnetic layer. The effect is observed as
an angle-de... | 1906.03124v3 |
2020-04-17 | Spectroscopic signatures of next-nearest-neighbor hopping in the charge and spin dynamics of doped one-dimensional antiferromagnets | We study the impact of next-nearest-neighbor (nnn) hopping on the low-energy
collective excitations of strongly correlated doped antiferromagnetic cuprate
spin chains. Specifically, we use exact diagonalization and the density matrix
renormalization group method to study the single-particle spectral function,
the dynam... | 2004.08435v1 |
2020-04-20 | Optical detection of electron spin dynamics driven by fast variations of a magnetic field: a simple method to measure $T_1$, $T_2$, and $T_2^*$ in semiconductors | We develop a simple method for measuring the electron spin relaxation times
$T_1$, $T_2$ and $T_2^*$ in semiconductors and demonstrate its exemplary
application to $n$-type GaAs. Using an abrupt variation of the magnetic field
acting on electron spins, we detect the spin evolution by measuring the Faraday
rotation of a... | 2004.09408v1 |
2016-03-02 | Spin Manipulation in Graphene by Chemically-Induced Sublattice Pseudospin Polarization | Spin manipulation is one of the most critical challenges to realize
spin-based logic devices and spintronic circuits. Graphene has been heralded as
an ideal material to achieve spin manipulation but so far new paradigms and
demonstrators are limited. Here we show that certain impurities such as
fluorine ad-atoms, which... | 1603.00834v1 |
2016-12-14 | How to control Spin-Seebeck current in a metal-quantum dot-magnetic insulator junction | The control of the spin-Seebeck current is still a challenging task for the
development of spin caloritronic devices. Here, we construct a spin-Seebeck
device by inserting a strongly correlated quantum dot (QD) between the metal
lead and magnetic insulator. Using the slave-particle approach and non-crossing
approximati... | 1612.05595v1 |
2016-12-29 | Spin-Pairing Correlations and Spin Polarization of Majorana Bound States in Two-Dimensional Topological Insulator Systems | We demonstrate that zero-energy Majorana bound state, in the ferromagnetic
insulator (FI)-superconductor (SC) junction formed on the edge of
two-dimensional topological insulator, exhibits three types of spin-triplet
pairing correlations and its spin polarization direction is position
independent in ferromagnetic insul... | 1612.09127v1 |
2020-09-11 | Spin entanglement via STM current | We consider a system of two spins under a scanning tunneling microscope bias
and derive its master equation. We find that the tunneling elements to the
electronic contacts (tip and substrate) generate an exchange interaction
between the spins, as well as a Dzyaloshinskii-Moriya interaction in the
presence of spin-orbit... | 2009.05452v2 |
2020-11-03 | Intensity equations for birefringent spin lasers | Semiconductor spin lasers are distinguished from their conventional
counterparts by the presence of spin-polarized carriers. The transfer of
angular momentum of the spin-polarized carriers to photons provides important
opportunities for the operation of lasers. With the injection of spin-polarized
carriers, which lead ... | 2011.01486v1 |
2021-02-24 | Realization of exciton-mediated optical spin-orbit interaction in organic microcrystalline resonators | The ability to control the spin-orbit interaction of light in optical
microresonators is of fundamental importance for future photonics. Organic
microcrystals, due to their giant optical anisotropy, play a crucial role in
spin-optics and topological photonics. Here we realize controllable and
wavelength-dependent Rashb... | 2102.12200v1 |
2021-08-03 | Atomic scale control of spin current transmission at interfaces | Spin transmission at ferromagnet/heavy metal interfaces is of vital
importance for many spintronic devices. Usually the spin current transmission
is limited by the spin mixing conductance and loss mechanisms such as spin
memory loss. In order to understand these effects, we study the interface
transmission when an insu... | 2108.01770v1 |
2017-01-02 | Important role of magnetization precession angle measurement in inverse spin Hall effect induced by spin pumping | Here, we investigate spin Hall angle of Pt in Ni80Fe20/Pt bilayer system by
using a broadband spin pumping and inverse spin Hall effect measurement. An
out-of-plane excitation geometry with application of external magnetic field
perpendicular to the charge current direction is utilized in order to suppress
unwanted gal... | 1701.00412v1 |
2017-01-24 | Coherent control of the silicon-vacancy spin in diamond | Spin impurities in diamond have emerged as a promising building block in a
wide range of solid-state-based quantum technologies. The negatively charged
silicon-vacancy centre combines the advantages of its high-quality photonic
properties with a ground-state electronic spin, which can be read out
optically. However, fo... | 1701.06848v1 |
2019-08-14 | Quantum trajectories in spin-exchange collisions reveal the nature of spin-noise correlations in multi-species alkali vapors | Spin-exchange collisions in alkali vapors have been at the basis of several
fundamental and applied investigations, like nuclear structure studies and
tests of fundamental symmetries, ultra-sensitive atomic magnetometers, magnetic
resonance and bio-magnetic imaging. Spin-exchange collisions cause loss of spin
coherence... | 1908.05194v3 |
2020-06-10 | Atomic-scale spin-polarization maps using functionalized superconducting probes | A scanning tunneling microscope (STM) with a magnetic tip that has a
sufficiently strong spin-polarization can be used to map the sample's spin
structure down to the atomic scale but usually lacks the possibility to
absolutely determine the value of the sample's spin-polarization. Magnetic
impurities in superconducting... | 2006.05770v1 |
2020-06-29 | Electronic charge transfer driven by spin cycloidal structure | Muon spin rotation and resonant soft X-ray scattering experiments on
prototype multiferroics RMn2O5 (R = Y, Sm) are used to demonstrate that the
local electric displacements are driven by the spin-current (SC) mechanism.
Small local electric displacements were evaluated by observing spin
polarization at ligand O ions, ... | 2006.15834v2 |
2021-12-16 | Towards exact predictions of spin-phonon relaxation times: an ab initio implementation of open quantum systems theory | Spin-phonon coupling is the main drive of spin relaxation and decoherence in
solid-state semiconductors at finite temperature. Controlling this interaction
is a central problem for many disciplines, ranging from magnetic resonance to
quantum technologies. Spin relaxation theories have been developed for almost a
centur... | 2112.09236v1 |
2022-02-18 | Electron spins interaction in the spin-Peierls phase of the organic spin chain (o -DMTTF) 2 X (X = Cl, Br, I) | We investigate the electron spin resonance of the organic spin-Peierls chain
(o-DMTTF)2X with X = Cl, Br and I. We describe the temperature dependence of
the spin gap during the phase transition and quantify the dimerization
parameter $\delta$. At the lowest temperatures, the susceptibility is governed
by defects in th... | 2202.09071v1 |
2022-03-26 | Nonequilibrium dynamics in a spin valve with noncollinear magnetization | We utilize a hybrid quantum-classical equation of motion approach to
investigate the spin dynamics and spin-transfer torque in a spin valve under
bias voltage. We show that the interplay between localized classical magnetic
moments and conduction electrons induces a complex effective exchange coupling
between the magne... | 2203.14068v2 |
2022-04-04 | Inverse Orbital Torque via Spin-Orbital Entangled States | While current-induced torque by orbital current has been experimentally found
in various structures, evidence for its reciprocity has been missing so far.
Here, we report experimental evidence of strong inverse orbital torque in
YIG/Pt/CuOx (YIG = Y3Fe5O12) mediated by spin-orbital entangled electronic
states in Pt. By... | 2204.01825v2 |
2022-09-25 | Suppressing the decoherence of alkali-metal spins at low magnetic fields | Interactions of electron spins with rotational degrees of freedom during
collisions or with external fields are fundamental processes that limit the
coherence time of spin gases. We experimentally study the decoherence of warm
cesium spins dominated by spin rotation-interaction during binary collisions
with N$_2$ molec... | 2209.12236v1 |
2023-05-16 | Terahertz spin conductance probes of coherent and incoherent spin tunneling through MgO tunnel junctions | We study femtosecond spin currents through MgO tunneling barriers in CoFeB(2
nm)|MgO($d$)|Pt(2 nm) stacks by terahertz emission spectroscopy. To obtain
transport information independent of extrinsic experimental factors, we
determine the complex-valued spin conductance $\tilde{G}_d (\omega)$ of the MgO
layer (thickness... | 2305.09074v2 |
2023-06-14 | Coherent scattering from coupled two level systems | We study the resonance fluorescence properties of an optically active spin
1/2 system, elucidating the effects of a magnetic field on the coherence of the
scattered light. We derive a master equation model for this system that
reproduces the results of a two level system (TLS) while also being applicable
to a spin syst... | 2306.08439v1 |
2023-08-30 | Magnetization and Polarization of Coupled Nuclear Spin Ensembles | In magnetic resonance, the bulk magnetization of a sample that is being
measured is typically defined as a quantity proportional to spin polarization.
The fact that all spins of the same type contribute equally to measurable
signals is considered obvious. By focusing on nuclear spin ensembles, we prove
the high-field t... | 2308.15837v1 |
2023-09-06 | Topological spin texture and d-vector rotation in spin-triplet superconductors: A case of UTe2 | A novel spin texture formed by Cooper pair spins is found theoretically with
a phase string attached by half-quantized vortices at both ends in a unit cell
and characterized by its topologically rich vortex structure in a spin-triplet
pairing. It is stable at an intermediate field region sandwiched by two
conventional ... | 2309.02918v1 |
2024-02-16 | Spin projection noise and the magnetic sensitivity of optically pumped magnetometers | Present protocols for obtaining the ultimate magnetic sensitivity of
optically pumped magnetometers (OPMs) utilizing alkali-metal ensembles rely on
uncorrelated atoms in stretched states. A new approach for calculating the spin
projection noise (SPN)-limited signal to noise ratio (SNR) and the magnetic
sensitivity of O... | 2402.10746v2 |
2001-03-05 | Kondo resonant spectra in coupled quantum dots | The Kondo effect in coupled quantum dots is investigated from the viewpoint
of transmission spectroscopy using the slave-boson formalism of the Anderson
model. The antiferromagnetic spin-spin coupling $J$ between the dots is taken
into account. Conductance $G$ through the dots connected in a series is
characterized by ... | 0103093v1 |
2016-07-18 | Robust Upward Dispersion of the Neutron Spin Resonance in the Heavy Fermion Superconductor Ce$_{1-x}$Yb$_{x}$CoIn$_5$ | The neutron spin resonance is a collective magnetic excitation that appears
in copper oxide, iron pnictide, and heavy fermion unconventional
superconductors. Although the resonance is commonly associated with a
spin-exciton due to the $d$($s^{\pm}$)-wave symmetry of the superconducting
order parameter, it has also been... | 1607.05326v1 |
2016-07-25 | Optically Detected Ferromagnetic Resonance in Metallic Ferromagnets via Nitrogen Vacancy Centers in Diamond | We report quantitative measurements of optically detected ferromagnetic
resonance (ODFMR) of ferromagnetic thin films that use nitrogen-vacancy (NV)
centers in diamonds to transduce FMR into a fluorescence intensity variation.
To uncover the mechanism responsible for these signals, we study ODFMR as we 1)
vary the sepa... | 1607.07485v1 |
2016-03-01 | Magnetic field dependence of the neutron spin resonance in CeB6 | In zero magnetic field, the famous neutron spin resonance in the f-electron
superconductor CeCoIn5 is similar to the recently discovered exciton peak in
the non-superconducting CeB6. Magnetic field splits the resonance in CeCoIn5
into two components, indicating that it is a doublet. Here we employ inelastic
neutron sca... | 1603.00383v2 |
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