publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2001-07-24 | Analytical expressions for the spin-spin local-field factor and the spin-antisymmetric exchange-correlation kernel of a two-dimensional electron gas | We present an analytical expression for the static many-body local field
factor $G_{-}(q)$ of a homogeneous two-dimensional electron gas, which
reproduces Diffusion Monte Carlo data and embodies the exact asymptotic
behaviors at both small and large wave number $q$. This allows us to also
provide a closed-form expressi... | 0107501v1 |
2001-12-29 | Longitudinal spin waves in a dilute Bose gas | We present a kinetic theory for a dilute noncondensed Bose gas of two-level
atoms that predicts the transient spin segregation observed in a recent
experiment. The underlying mechanism driving spin currents in the gas is due to
a mean field effect arising from the quantum interference between the direct
and exchange sc... | 0112487v1 |
2003-08-29 | Magnetic Order and Dynamics in Stripe-Ordered La2-xSrxNiO4 | We have studied magnetic correlations in several compositions of
stripe-ordered La2-xSrxNiO4. In this paper we show how polarized-neutron
scattering has helped uncover important features of the magnetic ordering and
spin dynamics. In particular, polarization analysis has enabled us (1) to
characterize a spin reorientat... | 0308631v1 |
2003-10-01 | Rashba coupling in quantum dots: exact solution | We present an analytic solution to the problem of the Rashba spin-orbit
coupling in semiconductor quantum dots. We calculate the exact energy spectrum,
wave-functions, and spin--flip relaxation times. We discuss various effects
inaccessible via perturbation theory. In particular, we find that the effective
gyromagnetic... | 0310024v2 |
2005-08-31 | Order by disorder and gauge-like degeneracy in quantum pyrochlore antiferromagnet | The (three-dimensional) pyrochlore lattice antiferromagnet with Heisenberg
spins of large spin length $S$ is a highly frustrated model with an macroscopic
degeneracy of classical ground states. The zero-point energy of (harmonic
order) spin wave fluctuations distinguishes a subset of these states. I derive
an approxima... | 0509005v1 |
2006-06-15 | Optical spin pumping of modulation doped electrons probed by a two-color Kerr rotation technique | We report on optical spin pumping of modulation electrons in CdTe-based
quantum wells with low intrinsic electron density (by 10^10 cm^{-2}). Under
continuous wave excitation, we reach a steady state accumulated spin density of
about 10^8 cm^{-2}. Using a two-color Hanle-MOKE technique, we find a spin
relaxation time o... | 0606419v1 |
2006-07-04 | Scattering induced spin orientation and spin currents in gyrotropic structures | It is shown that additional contributions both to current-induced spin
orientation and to the spin Hall effect arise in quantum wells due to gyrotropy
of the structures. Microscopically, they are related to basic properties of
gyrotropic systems, namely, linear in the wave vector terms in the matrix
element of electron... | 0607074v1 |
2006-07-08 | Harper-Hofstadter problem for 2D electron gas with ${\bf k}$-linear Rashba spin-orbit coupling | The Harper-Hofstadter problem for two-dimensional electron gas with Rashba
spin-orbit coupling subject to periodic potential and perpendicular magnetic
field is studied analytically and numerically. The butterfly-like energy
spectrum, spinor wave functions as well as the spin density and average spin
polarization are c... | 0607216v1 |
2007-03-08 | Spin transverse force and quantum transverse transport | We present a brief review on spin transverse force, which exerts on the spin
as the electron is moving in an electric field. This force, analogue to the
Lorentz force on electron charge, is perpendicular to the electric field and
spin current carried by the electron. The force stems from the spin-orbit
coupling of elec... | 0703196v1 |
2001-04-24 | Extra Spin-Rotation Coupling Effect in a Radiating Kerr Space-time | Source-less wave equations are derived for massless scalar, neutrino and
electromagnetic perturbations of a radiating Kerr space-time, and the Hawking
radiation of massless particles with spin $s =0, 1/2$ and 1 in this geometry is
investigated by using a method of the generalized tortoise coordinate
transformation. An ... | 0104074v1 |
2006-04-21 | The Hyperfine Einstein-Infeld-Hoffmann Potential | We use recently developed effective field theory techniques to calculate the
third order post-Newtonian correction to the spin-spin potential between two
spinning objects. This correction represents the first contribution to the
spin-spin interaction due to the non-linear nature of general relativity and
will play an i... | 0604099v1 |
1997-12-11 | Greybody Factors for Black Holes in Four Dimensions: Particles with Spin | We compute the emission spectrum of minimally coupled particles with spin
that are Hawking radiated from four dimensional black holes in string theory.
For a range of the black hole parameters the result has a product structure
that may be interpreted in terms of the respective right- and left-moving
thermal correlatio... | 9712118v1 |
2005-09-13 | The continuous spin limit of higher spin field equations | We show that the Wigner equations describing the continuous spin
representations can be obtained as a limit of massive higher-spin field
equations. The limit involves a suitable scaling of the wave function, the mass
going to zero and the spin to infinity with their product being fixed. The
result allows to transform t... | 0509092v2 |
2005-04-08 | Spin as the Basis for Quantum Mechanics: A New Semiclassical Model for Electron Spin | A simple real-space model for the free-electron wavefunction with spin is
proposed, based on coherent vortices on the scale of h/mc, rotating at mc^2/h.
This reproduces the proper values for electron spin and magnetic moment.
Transformation to a moving reference frame turns this into a wave with the de
Broglie waveleng... | 0504068v1 |
2007-06-13 | Bispinor Formulation of Spin 3/2 Field Theory | In this paper, we investigate an alternative formulation for spin 3/2 field
equation. First we will review equation of motion of Dirac and Maxwell, and
then construct the equation for spin 3/2 in the similar fashion. Our method
actually a generalization of relativistic equation of motion based on spin
operator and Hami... | 0706.1910v4 |
2007-12-07 | Scattering of Spin-Zero and Spin-Half Particles in Momentum-Helicity Basis | Scattering of 2 particles of spin 0 and 1/2 is evaluated based on a basis
constructed from the momentum and the helicity states (the momentum-helicity
basis). This shortly called three-dimensional (3D) technique is a good
alternative to the standard partial wave (PW) technique especially for higher
energies, where PW c... | 0712.1101v1 |
2008-11-11 | Spin susceptibility, phase diagram, and quantum criticality in the electron-doped high Tc Superconductor Ba[Fe(1-x)Co(x)]2As2 | We report a systematic investigation of Ba[Fe(1-x)Co(x)]2As2 based on
transport and 75-As NMR measurements, and establish the electronic phase
diagram. We demonstrate that doping progressively suppresses the uniform spin
susceptibility and low frequency spin fluctuations. The optimum superconducting
phase emerges at x_... | 0811.1617v1 |
2008-11-13 | Cooling into the Spin-Nematic State for a Spin-1 Bose gase in an optical lattice | The possibility of adiabatically cooling a spin-1 polar Bose gas to a
spin-nematic phase is theoretically discussed. The relation between the order
parameter of the final spin-nematic phase and the starting temperature of the
spinor Bose gas is obtained both using the mean-field approach for the high
temperature and sp... | 0811.2054v1 |
2008-11-28 | Effect of Nonlocal Spin-Transfer Torque on Current-Induced Magnetization Dynamics | Using the self-consistent model, we present nonlocal spin-transfer effects
caused by the feedback between inhomogeneous magnetization and spin-transfer
torque on the current-induced magnetization dynamics in nanomagnets. The
nonlocal effects can substantially improve the coherence time of precession in
nanomagnets and ... | 0811.4649v1 |
2009-09-15 | Critical current density for spin transfer torque switching with composite free layer structure | Critical current density of composite free layer (CFL) in magnetic tunneling
junction is investigated. CFL consists of two exchange coupled ferromagnetic
layers, where the coupling is parallel or anti-parallel. Instability condition
of the CFL under the spin transfer torque, which is related with critical
current densi... | 0909.2711v1 |
2009-10-13 | Boltzmann theory of magnetoresistance due to a spin spiral | We studied the magnetoresistance due to a spin spiral by solving the
Boltzmann equation. The scattering rates of conduction electrons are calculated
by using the non-perturbative wave function of the conduction electrons and the
non-equilibrium distribution function is obtained by numerically solving the
Boltzmann equa... | 0910.2308v2 |
2010-08-06 | Ferromagnetic phases in spin-Fermion systems | Spin-Fermion systems which obtain their magnetic properties from a system of
localized magnetic moments being coupled to conducting electrons are
considered. The dynamical degrees of freedom are spin-$s$ operators of
localized spins and spin-1/2 Fermi operators of itinerant electrons.
Renormalized spin-wave theory, whi... | 1008.1148v1 |
2010-10-26 | Spin Fidelity for Three-qubit Greenberger-Horne-Zeilinger and W States Under Lorentz Transformations | Constructing the reduced density matrix for a system of three massive
spin$-\frac{1}{2}$ particles described by a wave packet with Gaussian momentum
distribution and a spin part in the form of GHZ or W state, the fidelity for
the spin part of the system is investigated from the viewpoint of moving
observers in the jarg... | 1010.5330v1 |
2012-03-27 | Spin dynamics in the Kapitza-Dirac effect | Electron spin dynamics in Kapitza-Dirac scattering from a standing laser wave
of high frequency and high intensity is studied. We develop a fully
relativistic quantum theory of the electron motion based on the time-dependent
Dirac equation. Distinct spin dynamics, with Rabi oscillations and complete
spin-flip transitio... | 1204.0239v2 |
2013-02-14 | Spin-Hall Conductivity and Electric Polarization in Metallic Thin Films | We predict theoretically that, when a normal metallic thin film (without bulk
spin-orbit coupling, such as Cu or Al) is sandwiched by two insulators, two
prominent effects arise due to the interfacial spin-orbit coupling: a giant
spin-Hall conductivity due to the surface scattering and a transverse electric
polarizatio... | 1302.3490v2 |
2013-06-25 | Designing a Spin-Seebeck Diode | Using micromagnetic simulations, we have investigated spin dynamics in a
spin-valve bi-layer in the presence of a thermal gradient. The direction and
the intensity of the gradient allow to excite the spin wave modes of each layer
selectively. This permits to synchronize the magnetization precession of the
two layers an... | 1306.5924v2 |
2014-01-27 | Spin chains and classical strings in rotating Rindler-AdS space | In this paper, we study the spin chain and string excitation in the rotating
Rindler-$AdS_3$ proposed in [12]. We obtain a one-parameter deformed $SL(2)$
spin chain at the fast spin limit. Two-spin GKP-like solutions are studied at
short and long string limits. General ansatz for the giant magnons and the
spiky strings... | 1401.6915v1 |
2014-03-17 | Massive twistor particle with spin generated by Souriau-Wess-Zumino term and its quantization | We present new model of D=4 relativistic massive particle with spin and we
describe its quantization. The model is obtained by an extension of standard
relativistic phase space description of massive spinless particle by adding new
topological Souriau-Wess-Zumino term which depends on spin fourvector variable.
We descr... | 1403.4127v1 |
2019-11-05 | Spin chains and classical strings in two parameters $q$-deformed AdS$_3\times$S$^3$ | In this paper, we study the spin chain and string excitation in the
two-parameters $q$-deformed AdS$_3\times$S$^3$ proposed by Hoare. We obtain the
deformed spin chain model at the fast spin limit for choices of deformed
parameters. General ansatz for giant magnons are studied in great detail and
complicated dispersion... | 1911.01567v1 |
2012-09-20 | Quench dynamics in spin crossover induced by high pressure | In this paper we have studied analytically and numerically dynamics of spin
crossover induced by time-dependent pressure. We show that quasi static
pressure, with a slow dependence on time, yields a spin crossover leading to
transition from the state of quantum system with high spin (HS) to the low spin
(LS). However, ... | 1209.4567v1 |
2018-02-21 | Spin-fluctuations drive the inverse magnetocaloric effect in Mn5Si3 | Inelastic neutron scattering measurements were performed on single crystals
of the antiferromagnetic compound Mn5Si3 in order to investigate the relation
between the spin dynamics and the magneto-thermodynamic properties. It is shown
that among the two stable antiferromagnetic phases of this compound, the high
temperat... | 1802.07511v1 |
2019-02-11 | Magnon excitations in $Cs_2CuAl_4O_8$ - a bond alternating S=1/2 spin chain with next nearest neighbor coupling | A recent density functional theory (DFT) based analysis, complemented with
Quantum Monte Carlo calculations revealed a highly spin-frustrating nature of
the one-dimensional spin-$\frac{1}{2}$ compound $Cs_2CuAl_4O_8$ that comprises
of unique bond alternations and relatively strong next nearest neighbor
interactions. Th... | 1902.04008v1 |
2008-06-19 | Anomalous Spin Response in Non-centrosymmetric Compounds | We examine static spin susceptibilities $\chi_{\alpha\beta}({\bf q})$ of spin
components $S_{\alpha}$ and $S_{\beta}$ in the non-centrosymmetric tetragonal
system. These show anomalous momentum dependences like $\chi_{xx}({\bf
q})-\chi_{yy}({\bf q})\sim q_x^2-q_y^2$ and $\chi_{xy}({\bf q})+\chi_{yx}({\bf
q})\sim q_x q_... | 0806.3214v1 |
2019-12-09 | Double-$Q$ Chiral Stripe in the $d$-$p$ Model with Strong Spin-Charge Coupling | We investigate the stability of multiple-$Q$ spiral states in $d$-$p$
electron systems with the strong spin-charge coupling. By using variational
calculations on a square lattice, we find that the double-$Q$ state with the
scalar chirality density wave, which has been studied in the weak spin-charge
coupling regime, be... | 1912.03906v1 |
2022-02-23 | General Spin Sums in Quantum Field Theory | In Quantum Field Theory, scattering amplitudes are computed from propagators
which, for internal lines, are built upon spin/polarization-sum relationships.
In turn, these are normally constructed upon plane-wave solutions of the free
field equations. A question that may now arise is whether such
spin/polarization-sums ... | 2203.04087v3 |
2022-05-30 | Fledgling quantum spin Hall effect in pseudo gap phase of Bi2212 | We study the emergence of the quantum spin Hall (QSH) states for the
pseudo-gap (PG) phase of Bi2212 bilayer system, assumed to be D-density
wave(DDW) ordered, starting with a strong Rashba spin-orbit coupling(SOC)
armed, and the time reversal symmetry (TRS) complaint Bloch Hamiltonian. The
presence of strong SOC gives... | 2205.15010v1 |
2023-06-02 | Chiral electrons and spin selectivity at chiral-achiral interfaces | Chiral molecules can selectively transport electrons of a particular spin
orientation, yet the underlying mechanism remain poorly understood. Here, we
present theoretical evidence that electrons propagating through chiral
materials with screw symmetry exhibit chirality themselves and carry
symmetry-induced pseudo-angul... | 2306.01664v2 |
2023-07-31 | Spin-frame field theory of a three-sublattice antiferromagnet | We present a nonlinear field theory of a three-sublattice hexagonal
antiferromagnet. The order parameter is the spin frame, an orthogonal triplet
of vectors related to sublattice magnetizations and spin chirality. The
exchange energy, quadratic in spin-frame gradients, has three coupling
constants, only two of which ma... | 2307.16853v2 |
2023-08-31 | Schwinger boson symmetric spin liquids of Shastry-Sutherland model | Motivated by recent experimental and numerical evidences of deconfined
quantum critical point and quantum spin-liquid states in spin-$1/2$ Heisenberg
model on Shastry-Sutherland lattice, we studied possible symmetric spin liquid
states and their proximate ordered states under Schwinger boson formalism. We
found a symme... | 2308.16563v3 |
2023-12-13 | Cubic action for Spinning Black Holes from massive higher-spin gauge symmetry | Scattering of two Kerr Black Holes emitting gravitational waves can be
captured by an effective theory of a massive higher-spin field interacting with
the gravitational field. While other compact objects should activate a
multitude of non-minimal interactions it is the black holes that should be
captured by the simples... | 2312.08184v1 |
2012-12-10 | An empirical study on a learning path on wave physics focused on energy | We describe an extracurricular learning path on waves focused on energy
transfer. The advantages of introducing mechanical waves by using the Shive
wave machine and laboratory activities are presented. Laboratories are realized
by inquiry, i.e. students explore waves behavior in qualitative way, guess what
can happen a... | 1212.2174v1 |
2017-11-12 | Double plasma resonance instability as a source of solar zebra emission | The double plasma resonance (DPR) instability plays a basic role in the
generation of solar radio zebras. In the plasma, consisting of the loss-cone
type distribution of hot electrons and much denser and colder background
plasma, this instability generates the upper-hybrid waves, which are then
transformed into the ele... | 1711.04281v1 |
2005-01-26 | High-field ESR studies of the quantum spin magnet CaCu2O3 | We report an electron spin resonance (ESR) study of the s=1/2-Heisenberg
pseudo-ladder magnet CaCu2O3 in pulsed magnetic fields up to 40 T. At
sub-Terahertz frequencies we observe an ESR signal originating from a small
amount of uncompensated spins residing presumably at the imperfections of the
strongly antiferromagne... | 0501647v3 |
2005-12-05 | Twin spin/charge roton mode and superfluid density: primary determining factors of $T_{c}$ in high-$T_{c}$ superconductors observed by neutron, ARPES, and $μ$SR | In the quest for primary factors which determine the transition temperature
$T_{c}$ of high-$T_{c}$ cuprate superconductors (HTSC), we develop a
phenomenological picture combining experimental results from muon spin
relaxation ($\mu$SR), neutron and Raman scattering, and angle-resolved
photoemission (ARPES) measurement... | 0512075v1 |
2007-05-16 | Quantum spin liquid states in the two dimensional kagome antiferromagnets, ZnxCu4-x(OD)6Cl2 | A three-dimensional system of interacting spins typically develops static
long-range order when it is cooled. If the spins are quantum (S = 1/2),
however, novel quantum paramagnetic states may appear. The most highly sought
state among them is the resonating valence bond (RVB) state in which every pair
of neighboring q... | 0705.2279v1 |
2009-05-04 | $T_1$- and $T_2$-spin relaxation time limitations of phosphorous donor electrons near crystalline silicon to silicon dioxide interface defects | A study of donor electron spins and spin--dependent electronic transitions
involving phosphorous ($^{31}$P) atoms in proximity of the (111) oriented
crystalline silicon (c-Si) to silicon dioxide (SiO$_{2}$) interface is
presented for [$^{31}$P] = 10$^{15}$ $\mathrm{cm}^{-3}$ and [$^{31}$P] =
10$^{16}$ $\mathrm{cm}^{-3}... | 0905.0416v1 |
2012-07-16 | Decoherence mechanisms of 209Bi donor electron spins in isotopically pure 28Si | Bismuth (209Bi) is the deepest Group V donor in silicon and possesses the
most extreme characteristics such as a 9/2 nuclear spin and a 1.5 GHz hyperfine
coupling. These lead to several potential advantages for a Si:Bi donor electron
spin qubit compared to the more common phosphorus donor. Previous studies on
Si:Bi hav... | 1207.3776v3 |
2014-08-27 | Dynamics of a mesoscopic nuclear spin ensemble interacting with an optically driven electron spin | The ability to discriminate between simultaneously occurring noise sources in
the local environment of semiconductor InGaAs quantum dots, such as electric
and magnetic field fluctuations, is key to understanding their respective
dynamics and their effect on quantum dot coherence properties. We present a
discriminatory ... | 1408.6437v2 |
2015-02-02 | Two-axis spin squeezing in two cavities | Ultracold atoms in an ultrahigh-finesse optical cavity are a powerful
platform to produce spin squeezing since photon of cavity mode can induce
nonlinear spin-spin interaction and thus generate a one-axis twisting
Hamiltonian $H_{\text{OAT}}=qJ_{x}^{2}$, whose corresponding maximal squeezing
factor scales as $N^{-2/3}$... | 1502.00470v1 |
2015-05-06 | Bipolar polaron pair recombination in P3HT/PCBM solar cells | The unique properties of organic semiconductors make them versatile base
materials for many applications ranging from light emitting diodes to
transistors. The low spin-orbit coupling typical for carbon-based materials and
the resulting long spin lifetimes give rise to a large influence of the
electron spin on charge t... | 1505.01411v1 |
2016-07-14 | Spin dynamics of diamond nitrogen-vacancy centres at the ground state level anti-crossing and all-optical low frequency magnetic field sensing | We investigate the photo-induced spin dynamics of single nitrogen-vacancy
(NV) centres in diamond near the electronic ground state level anti-crossing
(GSLAC), which occurs at an axial magnetic field around 1024 G. Using optically
detected magnetic resonance spectroscopy, we first find that the electron spin
transition... | 1607.04006v1 |
2017-08-09 | Electrically driven electron spin resonance mediated by spin-valley-orbit coupling in a silicon quantum dot | The ability to manipulate electron spins with voltage-dependent electric
fields is key to the operation of quantum spintronics devices, such as
spin-based semiconductor qubits. A natural approach to electrical spin control
exploits the spin-orbit coupling (SOC) inherently present in all materials. So
far, this approach... | 1708.02903v2 |
2018-05-22 | FMR-related phenomena in spintronic devices | Spintronic devices, such as non-volatile magnetic random access memories and
logic devices, have attracted considerable attention as potential candidates
for future high efficient data storage and computing technology. In a heavy
metal or other emerging material with strong spin-orbit coupling (SOC), the
charge current... | 1805.08496v1 |
2014-06-02 | Knight shift and nuclear spin relaxation in Fe/n-GaAs heterostructures | We investigate the dynamically polarized nuclear-spin system in
Fe/\emph{n}-GaAs heterostructures using the response of the electron-spin
system to nuclear magnetic resonance (NMR) in lateral spin-valve devices. The
hyperfine interaction is known to act more strongly on donor-bound electron
states than on those in the ... | 1406.0436v2 |
2019-02-04 | Electron Spin Resonance of P Donors in Isotopically Purified Si Detected by Contactless Photoconductivity | Coherence times of electron spins bound to phosphorus donors have been
measured, using a standard Hahn echo technique, to be up to 20 ms in
isotopically pure silicon with [P]$ = 10^{14}$ cm$^{-3}$ and at temperatures
$\leq 4 $K. Although such times are exceptionally long for electron spins in
the solid state, they are ... | 1902.01343v3 |
2019-06-10 | Room Temperature Initialisation and Readout of Intrinsic Spin Defects in a Van der Waals Crystal | Optically addressable spins in widebandgap semiconductors have become one of
the most prominent platforms for exploring fundamental quantum phenomena. While
several candidates in 3D crystals including diamond and silicon carbide have
been extensively studied, the identification of spindependent processes in
atomically ... | 1906.03774v1 |
2017-06-25 | Robust electric dipole transition at microwave frequencies for nuclear spin qubits in silicon | The nuclear spin state of a phosphorus donor ($^{31}$P) in isotopically
enriched silicon-28 is an excellent host to store quantum information in the
solid state. The spin's insensitivity to electric fields yields a solid-state
qubit with record coherence times, but also renders coupling to other quantum
systems very ch... | 1706.08095v2 |
2019-03-07 | Readout of a dopant spin in the anisotropic quantum dot with a single magnetic ion | Owing to exchange interaction between the exciton and magnetic ion, a quantum
dot embedding a single magnetic ion is a great platform for optical control of
individual spin. In particular, a quantum dot provides strong and sharp optical
transitions, which give experimental access to spin states of an individual
magneti... | 1903.02969v1 |
2019-05-31 | Fingerprints of Kitaev physics in the magnetic excitations of honeycomb iridates | In the quest for realizations of quantum spin liquids, the exploration of
Kitaev materials - spin-orbit entangled Mott insulators with strong
bond-directional exchanges - has taken center stage. However, in these
materials the local spin-orbital j=1/2 moments typically show long-range
magnetic order at low temperature,... | 1905.13590v1 |
2020-03-02 | Cavity quantum electrodynamic readout of a solid-state spin sensor | Robust, high-fidelity readout is central to quantum device performance.
Overcoming poor readout is an increasingly urgent challenge for devices based
on solid-state spin defects, particularly given their rapid adoption in quantum
sensing, quantum information, and tests of fundamental physics. Spin defects in
solids com... | 2003.01104v1 |
2021-02-17 | Optically reconfigurable quantum spin-valley Hall effect of light in coupled nonlinear ring resonator lattice | Scattering immune propagation of light in topological photonic systems may
revolutionarize the design of integrated photonic circuits for information
processing and communications. In optics, various photonic topological circuits
have been developed, which were based on classical emulation of either quantum
spin Hall e... | 2102.08750v1 |
2016-11-23 | X-ray imaging of spin currents and magnetisation dynamics at the nanoscale | Understanding how spins move in time and space is the aim of both fundamental
and applied research in modern magnetism. Over the past three decades, research
in this field has led to technological advances that have had a major impact on
our society, while improving the understanding of the fundamentals of spin
physics... | 1611.07691v2 |
2022-06-08 | Coherent spin dynamics of rare-earth doped crystals in the high-cooperativity regime | Rare-earth doped crystals have long coherence times and the potential to
provide quantum interfaces between microwave and optical photons. Such
applications benefit from a high cooperativity between the spin ensemble and a
microwave cavity -- this motivates an increase in the rare earth ion
concentration which in turn ... | 2206.04027v2 |
2022-06-28 | Strong coupling between a photon and a hole spin in silicon | Spins in semiconductor quantum dots constitute a promising platform for
scalable quantum information processing. Coupling them strongly to the photonic
modes of superconducting microwave resonators would enable fast non-demolition
readout and long-range, on-chip connectivity, well beyond nearest-neighbor
quantum intera... | 2206.14082v2 |
2022-09-06 | Temperature- and field angular-dependent helical spin period characterized by magnetic dynamics in a chiral helimagnet $MnNb_3S_6$ | The chiral magnets with topological spin textures provide a rare platform to
explore topology and magnetism for potential application implementation. Here,
we study the magnetic dynamics of several spin configurations on the monoaxial
chiral magnetic crystal $MnNb_3S_6$ via broadband ferromagnetic resonance (FMR)
techn... | 2209.02266v1 |
2022-11-07 | Room temperature charge-to-spin conversion from q-2DEG at SrTiO3-based interfaces | Interfacial two-dimensional electron gas (2DEG), especially the SrTiO3-based
ones at the unexpected interface of insulators, have emerged to be a promising
candidate for efficient charge-spin current interconversion. In this article,
to gain insight into the mechanism of the charge-spin current interconversion
at the o... | 2211.03383v1 |
2023-01-27 | Realization of valley-spin polarized current via parametric pump in monolayer $\rm MoS_2$ | Monolayer $MoS_2$ is a typical valleytronic material with valley-spin locked
valence bands. We numerically investigate the valley-spin polarized current in
monolayer $\rm MoS_2$ via adiabatic electron pumping. By introducing an
exchange field to break the energy degeneracy of monolayer $MoS_2$, the top of
its valence b... | 2301.11644v1 |
2023-04-25 | Spin-liquid-like state in a square lattice antiferromagnet | Collective behavior of spins, frustration-induced strong quantum fluctuations
and subtle interplay between competing degrees of freedom in quantum materials
can lead to correlated quantum states with fractional excitations that are
essential ingredients for establishing paradigmatic models and have immense
potential fo... | 2304.13116v1 |
2007-11-02 | Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts | Manipulation of the spin-states of a quantum dot by purely electrical means
is a highly desirable property of fundamental importance for the development of
spintronic devices such as spin-filters, spin-transistors and single-spin
memory as well as for solid-state qubits. An electrically gated quantum dot in
the Coulomb... | 0711.0320v1 |
2017-02-01 | Coherent Rabi dynamics of a superradiant spin ensemble in a microwave cavity | We achieve the strong coupling regime between an ensemble of phosphorus donor
spins in a highly enriched $^{28}$Si crystal and a 3D dielectric resonator.
Spins were polarized beyond Boltzmann equilibrium using spin selective optical
excitation of the no-phonon bound exciton transition resulting in $N$ =
$3.6\cdot10^{13... | 1702.00504v1 |
2006-10-17 | QPOs in microquasars: the spin problem | In the Galactic microquasars with double peak kHz quasi-periodic oscillations
(QPOs), the ratio of the two frequencies is 3:2. This supports the suggestion
that double peak kHz QPOs are due to a non-linear resonance between two modes
of accretion disk oscillations. For the microquasars with known mass, we
briefly compa... | 0610497v1 |
1999-07-13 | Nonlinear Spin Dynamics in Ferromagnets with Electron-Nuclear Coupling | Nonlinear spin motion in ferromagnets is considered with nonlinearity due to
three factors: (i) the sample is prepared in a strongly nonequilibrium state,
so that evolution equations cannot be linearized as would be admissible for
spin motion not too far from equilibrium, (ii) the system considered consists
of interact... | 9907188v1 |
2001-07-17 | Cu Nuclear Quadrupole Resonance Study of the Spin-Peierls Compound Cu1-xMgxGeO3: A Possibility of Precursory Dimerization | We report on a zero-field 63Cu nuclear quadrupole resonance (NQR) study of
nonmagnetic Mg impurity substituted Cu1-xMgxGeO3 (single crystals; the
spin-Peierls transition temperature Tsp~14, 13.5, and 11 K for x=0, 0.0043, and
0.020) in a temperature range from 4.2 K to 250 K. We found that below T*~77 K,
Cu NQR spectra... | 0107353v1 |
2001-12-07 | Time Scales of Phonon Induced Decoherence of Semiconductor Spin Qubits | Decoherence of a shallow donor electron spin in silicon caused by
electron-lattice interaction is studied. We find that there are two time scales
associated with the evolution of the electron spin density matrix: the fast but
incomplete decay due to the interaction with non-resonant phonons followed by
slow relaxation ... | 0112135v1 |
2002-06-12 | Spin-spin cross-relaxation in single-molecule magnets | It is shown that dipolar and weak superexchange interactions between the spin
systems of single-molecule magnets (SMM) play an important role in the
relaxation of magnetization. These interactions can reduce or increase resonant
tunneling. The one-body tunnel picture of SMMs is not always sufficient to
explain the meas... | 0206195v1 |
2003-05-14 | Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR | We present electron spin resonance data of Ti$^{3+}$ (3$d^1$) ions in single
crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g
tensor yields direct evidence that the d_{xy} orbital from the t_{2g} set is
predominantly occupied and owing to the occurrence of orbital order a linear
spin chain... | 0305317v2 |
2003-07-28 | Optical Detection of Single-Electron Spin Decoherence in a Quantum Dot | We propose a method based on optically detected magnetic resonance (ODMR) to
measure the decoherence time $T_{2}$ of a single electron spin in a
semiconductor quantum dot. The electron spin resonance (ESR) of a single excess
electron on a quantum dot is probed by circularly polarized laser excitation.
Due to Pauli bloc... | 0307669v2 |
2003-09-19 | Quantum Dissipative Dynamics of the Magnetic Resonance Force Microscope in the Single-Spin Detection Limit | We study a model of a magnetic resonance force microscope (MRFM) based on the
cyclic adiabatic inversion technique as a high-resolution tool to detect single
electron spins. We investigate the quantum dynamics of spin and cantilever in
the presence of coupling to an environment. To obtain the reduced dynamics of
the co... | 0309456v1 |
2004-09-10 | A study of the deep structure of the energy landscape of glassy polystyrene: the exponential distribution of the energy-barriers revealed by high-field Electron Spin Resonance spectroscopy | The reorientation of one small paramagnetic molecule (spin probe) in glassy
polystyrene (PS) is studied by high-field Electron Spin Resonance spectroscopy
at two different Larmor frequencies (190 and 285 GHz). The exponential
distribution of the energy-barriers for the rotational motion of the spin probe
is unambigousl... | 0409258v2 |
2004-11-10 | Dynamical nuclear polarization and nuclear magnetic fields in semiconductor nanostructures | We investigate the dynamic nuclear polarization from the hyperfine
interaction between nonequilibrium electronic spins and nuclear spins coupled
to them in semiconductor nanostructures. We derive the time and position
dependence of the induced nuclear spin polarization and dipolar magnetic
fields. In GaAs/AlGaAs parabo... | 0411277v1 |
2004-11-24 | Spin-charge mixing effects on resonant tunneling in a polarized Luttinger Liquid | We investigate spin-charge mixing effect on resonant tunneling in
spin-polarized Tomonaga-Luttinger liquid with double impurities. The mixing
arises from Fermi velocity difference between two spin species due to Zeeman
effect. Zero bias conductance is calculated as a function of gate voltage
$V_{\rm g}$, gate magnetic ... | 0411600v3 |
2005-12-02 | Electrically detected electron spin resonance in a high mobility silicon quantum well | The resistivity change due to electron spin resonance (ESR) absorption is
investigated in a high-mobility two-dimensional electron system formed in a
Si/SiGe heterostructure. Results for a specific Landau level configuration
demonstrate that the primary cause of the ESR signal is a reduction of the spin
polarization, n... | 0512041v4 |
2006-02-06 | Switching the sign of photon induced exchange interactions in semiconductor microcavities with finite quality factors | We investigate coupling of localized spins in a semiconductor quantum dot
embedded in a microcavity with a finite quality factor. The lowest cavity mode
and the quantum dot exciton are coupled forming a polariton, whereas excitons
interact with localized spins via exchange. The finite quality of the cavity Q
is incorpo... | 0602122v1 |
2006-02-10 | Theory of Electric Dipole Spin Resonance in a Parabolic Quantum Well | A theory of Electric Dipole Spin Resonance (EDSR), that is caused by various
mechanisms of spin-orbit coupling, is developed as applied to free electrons in
a parabolic quantum well. Choosing a parabolic shape of the well has allowed us
to find explicit expressions for the EDSR intensity and its dependence on the
magne... | 0602264v1 |
2006-05-12 | Comment on Frequency response and origin of the spin-1/2 photolumines-cence-detected magnetic resonance in a pi-conjugated polymer | In a recent paper Segal et al. [1] attempted to explain the dynamics of spin
1/2 photoluminescence detected magnetic resonance (PLDMR) in films of a
pi-conjugated polymer, namely a soluble de-rivative of poly(phenylene-vinylene)
[MEH-PPV] using a model (dubbed TPQ), in which the PLDMR is due to spin
dependent triplet-p... | 0605322v1 |
2006-09-01 | Spin dynamics of $Yb Rh_2 Si_2$ observed by Electron Spin Resonance | Below the Kondo temperature $T_{\rm K}$ electron spin resonance (ESR) usually
is not observable from the Kondo-ion itself because the characteristic spin
fluctuation energy results in a huge width of the ESR line. The heavy fermion
metal YbRh$_{2}$Si$_{2}$ seems to be an exceptional case where definite ESR
spectra show... | 0609020v1 |
2006-09-11 | Current-driven ferromagnetic resonance, mechanical torques and rotary motion in magnetic nanostructures | We study theoretically the detection and possible utilization of electric
current-induced mechanical torques in ferromagnetic-normal metal
heterostructures that are generated by spin-flip scattering or the absorption
of transverse spin currents by a ferromagnet. To this end, we analyze the DC
voltage signals over a spi... | 0609258v2 |
2006-10-31 | Resonant magnetoresistance in organic spin-valves | We investigate theoretically the effects of surface states over the
magnetoresistance of Ni-based organic spin-valves. In particular we perform
{\it ab initio} electronic transport calculations for a benzene-thiolate
molecule chemically attached to a Ni [001] surface and contacted either by Te
to another Ni [001] surfa... | 0610866v1 |
2006-11-21 | Resonating Valence Bond States in 2 and 3D: Brief History and Recent Examples | Resonating Valence Bond states are quantum spin liquids, having low energy
spin-half (spinon) or spin-1 excitations. Although spins are `disordered', they
posses subtle topological orders and some times chiral orders. RVB states are
easily appreciated and seem natural in the quantum fluctuation dominated 1D
world. In 2... | 0611553v1 |
2007-01-31 | Nuclear Magnetic Resonance Study of Ultrananocrystalline Diamonds | We report on a nuclear magnetic resonance (NMR) study of ultrananocrystalline
diamond (UNCD) materials produced by detonation technique. Analysis of the 13C
and 1H NMR spectra, spin-spin and spin-lattice relaxation times in purified
UNCD samples is presented. Our measurements show that UNCD particles consist of
a diamo... | 0701771v1 |
2007-08-02 | Spin-Valley Kondo Effect in Multi-electron Silicon Quantum Dots | We study the spin-valley Kondo effect of a silicon quantum dot occupied by $%
\mathcal{N}$ electrons, with $\mathcal{N}$ up to four. We show that the Kondo
resonance appears in the $\mathcal{N}=1,2,3$ Coulomb blockade regimes, but not
in the $\mathcal{N}=4$ one, in contrast to the spin-1/2 Kondo effect, which
only occu... | 0708.0408v1 |
2007-09-04 | Chaotic dynamics of two 1/2 spin-qubit system in the optical cavity | Spin systems are one of the most promising candidates for quantum
computation. At the same time control of a system's quantum state during time
evolution is one of the actual problems. It is usually considered that to hold
well-known resonance condition in magnetic resonance is sufficient to control
spin system. But be... | 0709.0496v1 |
2007-09-27 | Spin-liquid dynamics of pyrochlore magnets Gd2Ti2O7 and Gd2Sn2O7 | The spin-liquid phase of two highly frustrated pyrochlore magnets Gd2Ti2O7
and Gd2Sn2O7 is probed using electron spin resonance in the temperature range
1.3 - 30 K. The deviation of the absorption line from the paramagnetic position
\nu =\gamma H observed in both compounds below the Curie-Weiss temperature
\Theta_CW ~ ... | 0709.4379v1 |
2008-04-29 | Spin-magnetophonon level splitting in semimagnetic quantum wells | Spin-magnetophonon level splitting in a quantum well made of a semimagnetic
wide gap semiconductor is considered. The semimagnetic semiconductors are
characterized by a large effective $g$ factor. The resonance conditions
$\hbar\omega_{\rm LO}=\mu_BgB$ for the spin flip between two Zeeman levels due
to interaction with... | 0804.4654v1 |
2008-09-17 | Enhanced spin Hall effect by resonant skew scattering in orbital-selective Kondo effect | The enhanced spin Hall effect in Au metal due to the resonant skew scattering
is studied with first-principles band structure calculations. Especially the
gigantic spin Hall angle $\gamma_S \cong 0.1$ observed recently (T.Seki et al.,
Nature Materials {\bf 7}, 125 (2008)) is attributed to the orbital-dependent
Kondo ef... | 0809.2921v1 |
2008-10-06 | Testing a possible W and Z structure at the LHC/CERN | One of the first channels to be experimentally analyzed at the LHC is $ p + p
\longrightarrow l^+ + l ^- + X $. A resonance in this channel would be a clear
indication of a new gauge neutral boson, as proposed in many extended models.
In this paper we call attention to the possibility that the new resonance in
this cha... | 0810.1027v2 |
2008-12-12 | Spin diffusion and magnetic eigenoscillations confined to single molecular layers in the organic conductors kappa-(BEDT-TTF)_2Cu[N(CN)_2X (X=Cl, Br) | The layered organic compounds, kappa-(BEDT-TTF)_2Cu[N(CN)_2X (X=Cl, Br) are
metals at ambient temperatures. At low temperatures, the Cl compound is a
weakly ferromagnetic Mott insulator while the isostructural Br compound is a
superconductor. We find by conduction electron spin resonance (CESR) and
antiferromagnetic re... | 0812.2383v1 |
2009-01-09 | Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering | We investigate magnetic excitations in the spin-ladder compound
Sr$_{14}$Cu$_{24}$O$_{41}$ using high-resolution Cu $L_3$-edge Resonant
Inelastic X-ray Scattering (RIXS). Our findings demonstrate that RIXS couples
to collective spin excitations from a quantum spin-liquid ground state. In
contrast to Inelastic Neutron S... | 0901.1331v2 |
2009-04-09 | Resonant tunneling-based spin ratchets | We outline a generic ratchet mechanism for creating directed spin-polarized
currents in ac-driven double well or double dot structures by employing
resonant spin transfer through the system engineered by local external magnetic
fields. We show its applicability to semiconductor nanostructures by
considering coherent tr... | 0904.1518v1 |
2009-06-30 | Cooling a magnetic resonance force microscope via the dynamical back-action of nuclear spins | We analyze the back-action influence of nuclear spins on the motion of the
cantilever of a magnetic force resonance microscope. We calculate the
contribution of nuclear spins to the damping and frequency shift of the
cantilever. We show that, at the Rabi frequency, the energy exchange between
the cantilever and the spi... | 0906.5420v2 |
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