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2023-10-18 | Chiral spin textures creation and dynamics in a rectangular nanostructure | Controlled creation of stable chiral spin textures is required to use them as
an energy-efficient information carrier in spintronics. Here we have studied
the stable creation of isolated chiral spin texture (skyrmion and antiskyrmion)
and its pair through the magnetization reversal of a rectangular nanostructure
using ... | 2310.12129v1 |
2023-12-21 | Generation of femtosecond spin-polarized current pulses at Fe/MgO interface by quasi-static voltage | The generation of short spin-current pulses is essential for fast spintronic
devices. So far, spin current pulses are generated by femtosecond laser pulses
which drive spins from a ferromagnetic metal layer. However, the need for
miniaturization, simplicity and energy efficiency favour electric-field control
of spintro... | 2312.13698v1 |
2023-12-29 | Quantum-grade nanodiamonds for ultrabright spin detection in live cells | Optically accessible spin-active nanomaterials are promising as quantum
nanosensors for probing biological samples. However, achieving bioimaging-level
brightness and high-quality spin properties for these materials is challenging
and hinders their application in quantum biosensing. Here, we demonstrate
ultrabright flu... | 2312.17603v2 |
2024-01-10 | Narrowly avoided spin-nematic phase in BaCdVO(PO$_4$)$_2$: NMR evidence | We present a $^{31}$P nuclear magnetic resonance (NMR) investigation of
BaCdVO(PO$_4$)$_2$ focusing on the nearly saturated regime between
$\mu_0H_{c1}$ = 4.05 T and $\mu_0H_{c2}$ = 6.5 T, used to be considered as a
promising candidate for a spin-nematic phase. NMR spectra establish the absence
of any dipolar order the... | 2401.05269v1 |
2024-03-04 | Multidimensional spectroscopy of nuclear spin clusters in diamond | Optically active spin defects in solids offer promising platforms to
investigate nuclear spin clusters with high sensitivity and atomic-site
resolution. To leverage near-surface defects for molecular structure analysis
in chemical and biological contexts using nuclear magnetic resonance (NMR),
further advances in spect... | 2403.02114v1 |
2024-03-21 | Realizing topological quantum magnets with atomic spins on surfaces | Artificial quantum systems have emerged as indispensable platforms to realize
exotic topological matter in a well-controlled manner. Here, we demonstrate
topological quantum Heisenberg spin lattices, engineered with spin chains and
two-dimensional spin arrays using spin 1/2 atoms on insulating films in a
scanning tunne... | 2403.14145v1 |
2024-03-26 | Nuclear spin-spin interactions in CdTe probed by zero and ultra-low-field optically detected NMR | Nuclear magnetic resonance (NMR) is particularly relevant for studies of
internuclear spin coupling at zero and ultra-low fields (ZULF), where spin-spin
interactions dominate over Zeeman ones. Here we report on ZULF NMR in CdTe. In
this semiconductor all magnetic isotopes have spin $I = 1/2$, so that
internuclear inter... | 2403.17593v1 |
2024-04-11 | Dynamical Reorientation of Spin Multipoles in Silicon Carbide by Transverse Magnetic Fields | The long-lived and optically addressable high-spin state of the negatively
charged silicon vacancy ($\mathrm{V_{Si}}$) in silicon carbide makes it a
promising system for applications in quantum technologies. Most studies of its
spin dynamics have been performed in external magnetic fields applied along the
symmetry axi... | 2404.07915v1 |
2020-03-14 | Enhanced longevity of the spin helix in low-symmetry quantum wells | In a semiconductor, collective excitations of spin textures usually decay
rather fast due to D'yakonov-Perel' spin relaxation. The latter arises from
spin-orbit coupling, which induces wave-vector-dependent spin rotations that,
in conjunction with random disorder scattering, generate spin decoherence.
However, symmetri... | 2003.06544v2 |
2020-01-17 | Thermal spin transport and spin in thermoelectrics | This article reviews the principles that govern the combined transport of
spin, heat, and charge. The extensive thermodynamic quantity associated with
spin transport is the magnetization; its Onsager-conjugate force is in general
the derivative of the free energy with respect to the magnetization. Spins are
carried in ... | 2001.06366v1 |
1996-07-11 | Exact results for resonating valence bonds states on 2D (narrow) systems | It is shown that the problem of calculating spin-spin correlation functions,
in the dimers RVB states, on a possibly diluted 2D square lattice, can be
formulated in terms of a transfer matrix. The transfer matrix is used for exact
numerical calculations of spin-spin correlation functions on ladders up to four
units wid... | 9607076v2 |
1997-10-29 | Relaxation Regimes of Spin Maser | Spin relaxation in a microscopic model of spin maser is studied
theoretically. Seven qualitatively different regimes are found: free induction,
collective induction, free relaxation, collective relaxation, weak
superradiance, pure superradiance, and triggered superradiance. The initiation
of relaxation can be originate... | 9710311v1 |
1999-05-18 | Spin-orbit scattering in d-wave superconductors | When non-magnetic impurities are introduced in a d-wave superconductor, both
thermodynamic and spectral properties are strongly affected if the impurity
potential is close to the strong resonance limit. In addition to the scalar
impurity potential, the charge carriers are also spin-orbit coupled to the
impurities. Here... | 9905262v1 |
2000-01-10 | SIN and SIS tunneling in cuprates | We calculate the SIN and SIS tunneling conductances for the spin-fermion
model. We argue that at strong spin-fermion coupling, relevant to cuprates,
both conductances have dip features near the threshold frequencies when a
tunneling electron begin emitting propagating spin excitation. We argue that
the resonance spin f... | 0001125v1 |
2000-09-21 | Dynamics of spin correlations in the spin-1/2 isotropic XY chain in a transverse field | Dynamic xx spin pair correlation functions for the isotropic spin-1/2 XY
chain are calculated numerically for long open chains in the presence of a
transverse magnetic field at finite temperature. As an application we discuss
the temperature dependence of the spin-spin relaxation time in PrCl_3. | 0009334v1 |
2000-10-10 | Optical manipulation of nuclear spin by a two-dimensional electron gas | Conduction electrons are used to optically polarize, detect and manipulate
nuclear spin in a (110) GaAs quantum well. Using optical Larmor magnetometry,
we find that nuclear spin can be polarized along or against the applied
magnetic field, depending on field polarity and tilting of the sample with
respect to the optic... | 0010139v1 |
2001-07-10 | Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa2Cu4O8 | We studied low-frequency spin dynamics near the impurity-induced
superconductor-to-insulator transition for underdoped high-Tc superconductor
YBa2(Cu1-xMx)4O8 (M=Ni, Zn) using the Cu nuclear quadrupole resonance (NQR)
spin-echo technique. We observed remarkable suppression of the normal-state
pseudo spin-gap and a loss... | 0107187v1 |
2002-10-02 | Local Magnetic Susceptibility of the Positive Muon in the Quasi 1D S=1/2 Antiferromagnet KCuF$_3$ | We report muon spin rotation measurements of the local magnetic
susceptibility around a positive muon in the paramagnetic state of the quasi
one-dimensional spin 1/2 antiferromagnet KCuF$_3$. Signals from two distinct
sites are resolved which have a temperature dependent frequency shift which is
different than the magn... | 0210060v1 |
2002-11-13 | Test for Pairing Symmetry Based on Spin Fluctuations in Organic Superconductors $κ$-(BEDT-TTF)$_{2}$X | We propose that the superconducting pairing symmetry of organic
superconductors $\kappa$-(BEDT-TTF)$_{2}$X can be determined by measuring the
position in momentum space of the incommensurate peaks of the spin
susceptibility. We show that the positions of these peaks are uniquely
determined by the symmetry of the superc... | 0211256v1 |
2003-02-17 | Theory of spin density profile in the magnetization plateaus of SrCu_2(BO_3)_2 | The two-dimensional spin-gap system ${\rm SrCu_2(BO_3)_2}$ shows unique
physical properties due to the low-dimensionality character and the strong
quantum fluctuations. Experimentally, 1/8-, 1/4-, and 1/3-plateaus have been
observed in the magnetization curve under magnetic fields up to 70 Tesla, and
the 1/2-plateau is... | 0302332v1 |
2003-03-01 | Electron Spin-Relaxation Times of Phosphorus Donors in Silicon | Pulsed electron paramagnetic resonance measurements of donor electron spins
in natural phosphorus-doped silicon (Si:P) and isotopically-purified 28Si:P
show a strongly temperature-dependent longitudinal relaxation time, T1, due to
an Orbach process with DeltaE = 126 K. The 2-pulse echo decay is exponential in
28Si:P, w... | 0303006v1 |
2003-05-23 | A realization of Yangian and its applications to the bi-spin system | Yangian $Y(sl(2))$ is realized in the bi-spin system coupled with a
time-dependent external magnetic field. It is shown that $Y(sl(2))$ generators
can describe the transitions between the ``spin triplet'' and the ``spin
singlet'' that evolve with time. Furthermore, new transition operators between
the states with Berry... | 0305550v1 |
2004-02-10 | Spin-lattice NMR relaxation by anomalous translational diffusion | A model-free theoretical framework for a phenomenological description of
spin-lattice relaxation by anomalous translational diffusion in inhomogeneous
systems based on the fractional diffusion equation is developed. The dependence
of the spin-lattice relaxation time on the size of the pores in porous glass
Vycor is exp... | 0402274v2 |
2004-02-12 | Impurity-induced tuning of quantum well states in spin-dependent resonant tunneling | We report exact model calculations of the spin-dependent tunneling in double
magnetic tunnel junctions in the presence of impurities in the well. We show
that the impurity can tune selectively the spin channels giving rise to a wide
variety of interesting and novel transport phenomena. The tunneling
magnetoresistance, ... | 0402324v1 |
2004-04-21 | Spin state readout by quantum jump technique: for the purpose of quantum computing | Utilizing the Pauli-blocking mechanism we show that shining circular
polarized light on a singly-charged quantum dot induces spin dependent
fluorescence. Employing the quantum-jump technique we demonstrate that this
resonance luminescence, due to a spin dependent optical excitation, serves as
an excellent readout mecha... | 0404494v1 |
2004-04-24 | Spin and Charge Pumping by Ferromagnetic-Superconductor Order Parameters | We study transport in ferromagnetic-superconductor/normal-metal systems. It
is shown that charge and spin currents are pumped from ferromagnetic
superconductors into adjacent normal metals by adiabatic changes in the order
parameters induced by external electromagnetic fields. Spin and charge pumping
identify the symme... | 0404591v2 |
2004-04-26 | Spin filtering through a double-bend structure | We propose a simple scheme for the spin filter by studying the coherent
transport of electrons through a double-bend structure in a quantum wire with a
weak lateral magnetic potential which is much weaker than the Fermi energy of
the leads. {\em Extremely large} spin polarized current in the order of {\em
micro-Ampere}... | 0404605v1 |
2005-01-03 | Electron Spin-Lattice Relaxation of doped Yb3+ ions in YBa2Cu3Ox | The electron spin-lattice relaxation (SLR) times T1 of Yb3+‡ ions were
measured from the temperature dependence of electron spin resonance linewidth
in Y0.99Yb0.01Ba2Cu3Ox with different oxygen contents. Raman relaxation
processes dominate the electron SLR. Derived from the temperature dependence of
the SLR rate, ... | 0501017v1 |
2005-11-28 | Spin susceptibility of underdoped cuprates: the case of Ortho-II YBa_2Cu_3O_{6.5} | Recent inelastic neutron scattering measurements found that the spin
susceptibility of detwinned and highly ordered ortho-II YBa_2Cu_3O_{6.5}
exhibits, in both the normal and superconducting states, one-dimensional
incommensurate modulations at low energies which were interpreted as a
signature of dynamic stripes. We p... | 0511661v1 |
2006-01-13 | Spin tunneling through an indirect barrier | Spin-dependent tunneling through an indirect bandgap barrier like the
GaAs/AlAs/GaAs heterostructure along [001] direction is studied by the
tight-binding method. The tunneling is characterized by the proportionality of
the Dresselhaus Hamiltonians at $\Gamma $ and $X$ points in the barrier and by
Fano resonances. The ... | 0601297v1 |
2006-03-27 | Visualizing high-temperature spin dynamics in La1-xCaxMnO3 from a mapping of EPR linewidth and g factor | This paper presents an analysis of electron paramagnetic resonance
parameters, i.e., g factor, linewidth, and intensity on powder samples of
La1-xCaxMnO3 at the commensurate carrier concentrations of x = N/8 (N = 1, 2,
3, 4, 5, 6, and 7). We demonstrate that the mapping of EPR parameters offers a
powerful tool to inves... | 0603705v2 |
2006-09-13 | Nonlinear Rashba Model and Spin Relaxation in Quantum Wells | We find that the Rashba spin splitting is intrinsically a nonlinear function
of the momentum, and the linear Rasha model may overestimate it significantly,
especially in narrow-gap materials. A nonlinear Rashba model is proposed, which
is in good agreement with the numerical results from the eight-band kp theory.
Using... | 0609311v1 |
2006-10-01 | Odd-frequency pairing and Josephson effect at superconducting interfaces | We demonstrate that, quite generally, the spin-singlet even-parity
(spin-triplet odd-parity) pair potential in a superconductor induces the
odd-frequency pairing component with spin-singlet odd-parity (spin-triplet
even-parity) near interfaces. The magnitude of the induced odd-frequency
component is enhanced in the pre... | 0610017v3 |
2007-02-09 | Spin-dependent transport properties in GaMnAs-based spin hot-carrier transistors | We have investigated the spin-dependent transport properties of GaMnAs-based
three-terminal semiconductor spin hot-carrier transistor (SSHCT) structures.
The emitter-base bias voltage VEB dependence of the collector current IC,
emitter current IE, and base current IB shows that the current transfer ratio
alpha (= IC / ... | 0702239v1 |
2003-06-27 | New effects in neutrino oscillations in matter and electromagnetic fields | Within the recently developed Lorentz invariant approach to neutrino spin and
flavour oscillations the following four new effects are discussed: 1) neutrino
spin oscillations in different electromagnetic field configurations, 2)
neutrino spin precession and oscillations stimulated by weak interaction with
background ma... | 0306280v1 |
2001-05-25 | Spin-vibrational 1+ states in 140Ce | The properties of collective I^$\Pi$=1+ states in double even semimagic
nucleus 140Ce are investigated in random phase approximation(RPA). The
calculation of the B(M1) strength, elastic gamma-scattering cross section
$\sigma_(gamma)(\omega)$ and gamma-decay width $\Sigma_(gamma)(\omega_i)$ show
that in 140Ce the isovec... | 0105065v1 |
2003-06-18 | Generation of Superposition Spin States in an Atomic Ensemble | A method for generating a mesoscopic superposition state of the collective
spin variable of a gas of atoms is proposed. The state consists of a
superposition of the atomic spins pointing in two slightly different
directions. It is obtained by using off resonant light to carry out Quantum Non
Demolition Measurements of ... | 0306121v1 |
2005-09-18 | The ultra-sensitive electrical detection of spin Rabi oscillation at paramagnetic defects | A short review of the pulsed electrically detected magnetic resonance (pEDMR)
experiment is presented. PEDMR allows the highly sensitive observation of
coherent electron spin motion of charge carriers and defects in semiconductors
by means of transient current measurements. The theoretical foundations, the
experimental... | 0509120v1 |
2005-12-12 | Fast polarimetry system for the application to spin quantum non-demolition measurement | We report the development of a fast pulse polarimeter for the application to
quantum non-demolition measurement of atomic spin (Spin QND). The developed
system was tunable to the atomic resonance of ytterbium atom and has narrow
laser linewidth suitable for spin QND. Using the developed polarimeter, we
successfully dem... | 0512089v2 |
2007-07-13 | Multiphoton antiresonance in large-spin systems | We study nonlinear response of a spin $S>1/2$ with easy-axis anisotropy. The
response displays sharp dips or peaks when the modulation frequency is
adiabatically swept through multiphoton resonance. The effect is a consequence
of a special symmetry of the spin dynamics in a magnetic field for the
anisotropy energy $\pr... | 0707.2107v1 |
2007-07-27 | Leakage-induced decoherence during single electron spin manipulation in a double quantum dot | Coherent single electron spin oscillation in a double quantum dot system
driven by a magnetic electron spin resonance field is studied theoretically
using a Bloch-type rate equation approach. The oscillation frequency and
relaxation time obtained using typical model parameters are consistent with
experiment findings. T... | 0707.4040v1 |
2007-10-06 | Spin Anisotropy in ZnCu_3(OH)_6Cl_2 | The spin anisotropic exchange interaction is suggested to contribute
significantly to the abnormal upturn of the magnetic susceptibility in the
ZnCu$_3$(OH)$_6$Cl$_2$. The saturation of the magnetic susceptibility below 300
mK observed in the muon spin resonance ($\mu$SR) experiment is the quantum
effect of the spin fl... | 0710.1334v3 |
2007-11-26 | Kondo Resonance in the Presence of Spin-Polarized Currents | We propose an improved method of the equation of motion approach to study the
Kondo problem in spin-dependent non-equilibrium conditions. We find that the
previously introduced additional renormalization for non-equilibrium Kondo
effects is not required when we use a proper decoupling scheme. Our improved
formulation i... | 0711.4121v1 |
2008-01-18 | Selective Spin Injection Controlled by Electrical way in Ferromagnet/Quantum Dot/Semiconductor system | Selective and large polarization of current injected into semiconductor (SC)
is predicted in Ferromagnet (FM)/Quantum Dot (QD)/SC system by varying the gate
voltage above the Kondo temperature. In addition, spin-dependent Kondo effect
is also revealed below Kondo temperature. It is found that Kondo resonances for
up sp... | 0801.2922v1 |
2008-01-30 | Enhanced thermal stability and spin-lattice relaxation rate of N@C60 inside carbon nanotubes | We studied the temperature stability of the endohedral fullerene molecule,
N@C60, inside single-wall carbon nanotubes using electron spin resonance
spectroscopy. We found that the nitrogen escapes at higher temperatures in the
encapsulated material as compared to its pristine, crystalline form. The
temperature dependen... | 0801.4783v1 |
2008-07-15 | Dynamics of dissipative coupled spins: decoherence and relaxation | We study the reduced dynamics of interacting spins, each coupled to its own
bath of bosons. We derive the solution in analytic form in the white-noise
limit and analyze the rich behaviors in diverse limits ranging from weak
coupling and/or low temperature to strong coupling and/or high temperature. We
also view the one... | 0807.2342v1 |
2008-10-24 | Polarization and entanglement in spin systems | We established important relationships between entanglement measures and the
order parameter (spin polarization) in nuclear spin systems controlled by the
nuclear magnetic resonance (NMR) technique. Since spin polarization can be
easily manipulated by the NMR technique, experimentalists are presented with an
opportunit... | 0810.4388v1 |
2008-11-25 | Theory of electric field induced one-magnon resonance in cycloidal spin magnets | We propose a new mechanism to induce a novel one-magnon excitation by the
electric component of light in cycloidal spin states, i.e. so called
electromagnon process. We calculated optical spectra in the cycloidal spin
structures as observed in multiferroic perovskite manganites RMnO3 where novel
magnetic excitations in... | 0811.4082v1 |
2009-03-13 | Spin-Exchange-Relaxation-Free Magnetometry Using Elliptically-Polarized Light | Spin-exchange relaxation free alkali-metal magnetometers typically operate in
the regime of high optical density, presenting challenges for simple and
efficient optical pumping and detection. We describe a high-sensitivity Rb
magnetometer using a single elliptically-polarized off-resonant laser beam.
Circular component... | 0903.2447v1 |
2009-04-22 | Current-induced nuclear-spin activation in a two-dimensional electron gas | Electrically detected nuclear magnetic resonance was studied in detail in a
two-dimensional electron gas as a function of current bias and temperature. We
show that applying a relatively modest dc-current bias, I_dc ~ 0.5 microAmps,
can induce a re-entrant and even enhanced nuclear spin signal compared with the
signal ... | 0904.3405v1 |
2009-05-08 | Hyperfine tensors of nitrogen-vacancy center in diamond from \emph{ab initio} calculations | We determine and analyze the charge and spin density distributions of
nitrogen-vacancy (N-V) center in diamond for both the ground and excited states
by \emph{ab initio} supercell calculations. We show that the hyperfine tensor
of $^{15}$N nuclear spin is negative and strongly anisotropic in the excited
state, in contr... | 0905.1169v1 |
2009-06-04 | Quark-Hadron Duality in Neutron Spin-Structure and g_2 moments at intermediate Q**2 | Jefferson Lab experiment E01-012 measured the He-3 spin-structure functions
and virtual photon asymmetries in the resonance region in the momentum transfer
range 1.0<Q**2<4.0(GeV/c)**2. Our data, when compared with existing deep
inelastic scattering data, were used to test quark-hadron duality in g_1 and
A_1 for He-3 a... | 0906.0928v1 |
2009-09-15 | The effective spin concept to analyze coherent charge transport in mesoscopic systems | An effective spin concept is introduced to examine the mathematical and
physical analogy between phase coherent charge transport in mesoscopic systems
and quantum operations on spin based qubits. When coupled with the Bloch sphere
concept, this isomorphism allows formulation of transport problems in a
language more fam... | 0909.2892v1 |
2010-04-01 | Phenomenological Model of Longitudinal Spin Fluctuations in Itinerant Antiferromagnets | We present the phenomenological analysis of the spectrum of longitudinal spin
fluctuations in isotropic itinerant electron antiferromagnets with account of
spin anharmonicity giving rise to coupling of transverse and longitudinal
normal modes. The spectrum consists of a quasielastic part forming a central
peak or a dip... | 1004.0136v1 |
2010-05-17 | QND Measurement of Large-Spin Ensembles by Dynamical Decoupling | Quantum non-demolition (QND) measurement of collective variables by
off-resonant optical probing has the ability to create entanglement and
squeezing in atomic ensembles. Until now, this technique has been applied to
real or effective spin one-half systems. We show theoretically that the
build-up of Raman coherence pre... | 1005.2807v1 |
2010-06-28 | Eliashberg Analysis of Optical Spectra Reveals Strong Coupling of Charge Carriers to Spin Fluctuations in Superconducting Iron Pnictides | The temperature and frequency dependences of the optical conductivity of Co
and Ni-doped BaFe2As2 are analyzed and the electron-boson spectral density
a2F(w) extracted using Eliashberg's formalism. The characteristic energy of a
large peak in the spectrum around 10 meV coincide with the resonance peak in
the spin excit... | 1006.5468v1 |
2011-04-28 | Spin and Orbital Characters of Excitations in Iron Arsenide Superconductors Revealed by Simulated Fe L-Edge RIXS | We theoretically examine the orbital excitations coupled to the spin degree
of freedom in the parent state of the iron-arsenide superconductor, based on
the calculation in a five-band itinerant model. The calculated Fe $L_3$-edge
resonant inelastic x-ray scattering (RIXS) spectra disclose the presence of
spin-flip exci... | 1104.5424v2 |
2011-07-04 | Minimization of the Switching Time of a Synthetic Free Layer in Thermally Assisted Spin Torque Switching | We theoretically studied the thermally assisted spin torque switching of a
synthetic free layer and showed that the switching time is minimized if the
condition H_J=|H_s|/(2 alpha) is satisfied, where H_J, H_s and alpha are the
coupling field of two ferromagnetic layers, the amplitude of the spin torque,
and the Gilber... | 1107.0753v2 |
2011-07-14 | Coherent control of two nuclear spins using the anisotropic hyperfine interaction | We demonstrate coherent control of two nuclear spins mediated by the magnetic
resonance of a hyperfine-coupled electron spin. This control is used to create
a double nuclear coherence in one of the two electron spin manifolds, starting
from an initial thermal state, in direct analogy to the creation of an
entangled (Be... | 1107.2884v2 |
2011-08-09 | Evidence for spin memory in the electron phase coherence in graphene | We measure the dependence of the conductivity of graphene as a function of
magnetic field, temperature and carrier density and discover a saturation of
the dephasing length at low temperatures that we ascribe to spin memory
effects. Values of the spin coherence length up to eight microns are found to
scale with the mea... | 1108.2067v1 |
2011-09-19 | Storage and Retrieval of a Microwave Field in a Spin Ensemble | We report the storage and retrieval of a small microwave field from a
superconducting resonator into collective excitations of a spin ensemble. The
spins are nitrogen-vacancy centers in a diamond crystal. The storage time of
the order of 30 ns is limited by inhomogeneous broadening of the spin ensemble. | 1109.3960v1 |
2011-09-22 | Probing the spin states of three interacting electrons in quantum dots | We observe a low-lying sharp spin mode of three interacting electrons in an
array of nanofabricated AlGaAs/GaAs quantum dots by means of resonant inelastic
light scattering. The finding is enabled by a suppression of the inhomogeneous
contribution to the excitation spectra obtained by reducing the number of
optically-p... | 1109.4758v1 |
2011-10-24 | Spin-orbital Kondo effect in a parallel double quantum dot | Transport properties of the two-orbital Kondo effect involving both spin and
orbital (pseudospin) degrees of freedom were examined in a parallel double
quantum dot with a sufficient interdot Coulomb interaction and negligibly small
interdot tunneling. The Kondo effect was observed at the interdot Coulomb
blockade regio... | 1110.5130v1 |
2012-06-15 | Optical control of the spin state of two Mn atoms in a quantum dot | We report on the optical spectroscopy of the spin of two magnetic atoms (Mn)
embedded in an individual quantum dot interacting with either a single
electron, a single exciton and single trion. As a result of their interaction
to a common entity, the Mn spins become correlated. The dynamics of this
process is probed by ... | 1206.3491v1 |
2012-10-18 | Enhanced Inverse Spin-Hall Effect in Ultrathin Ferromagnetic/Normal Metal Bilayers | We measure electrically detected ferromagnetic resonance in microdevices
patterned from ultra-thin Co/Pt bilayers. Spin pumping and rectification
voltages are observed and distinguished via their angular dependence. The
spin-pumping voltage shows an unexpected increase as the cobalt thickness is
reduced below 2 nm. Thi... | 1210.5230v1 |
2012-11-12 | Spin polarization and magnetoresistance through a ferromagnetic barrier in bilayer graphene | We study spin dependent transport through a magnetic bilayer graphene
nanojunction configured as two dimensional normal/ferromagnetic/normal
structure where the gate-voltage is applied on the layers of ferromagnetic
graphene. Based on the fourband Hamiltonian, conductance is calculated by using
Landauer Butikker formul... | 1211.2701v1 |
2012-11-29 | Pumping $ac$ Josephson current in the Single Molecular Magnets by spin nutation | We demonstrate that an {\it ac} Josephson current is pumped through the
Single Molecular Magnets (SMM) by the spin nutation. The spin nutation is
generated by applying a time dependent magnetic field to the SMM. We obtain the
flowing charge current through the junction by working in the tunneling limit
and employing Gr... | 1211.6879v1 |
2012-12-18 | Spin system trajectory analysis under optimal control pulses | Several methods are proposed for the analysis, visualization and
interpretation of high-dimensional spin system trajectories produced by quantum
mechanical simulations. It is noted that expectation values of specific
observables in large spin systems often feature fast, complicated and
hard-to-interpret time dynamics a... | 1212.4454v1 |
2013-06-18 | Ultrasensitive Detection of Majorana Fermions via Spin-based Optomechanics with Carbon Nanotubes | We propose a novel optical method to detect the existence of Majorana
fermions at the ends of the semiconductor nanowire via the coupling to an
electron spin trapped on a carbon nanotube resonator under the control of a
strong pump field and a weak probe field. The coupling strength of Majorana
fermion to the spin in t... | 1306.4102v1 |
2014-02-13 | Inhomogeneous slowing down of spin fluctuations induced by charge stripe order in 1/8-doped lanthanum cuprates | We report $^{139}$La nuclear magnetic resonance (NMR) measurements on
La$_{2-x}$Sr$_x$CuO$_4$ ($0.07\leq x \leq 0.15$) and La$_{2-x}$Ba$_x$CuO$_4$
($x=1/8$) single crystals, focusing on the spin freezing observed in 1/8-doped
lanthanum cuprates. Charge stripe order seems to induce the inhomogeneous
slowing down of spin... | 1402.3077v3 |
2014-03-18 | 31P NMR Investigation of the Superconductor LiFeP (Tc = 5 K) | We investigate the static and dynamic spin susceptibility of the 111 type
Fe-based superconductor LiFeP with Tc ~ 5 K through the measurement of Knight
shift 31K and the spin-lattice relaxation rate 1/T1 at 31P site by nuclear
magnetic resonance. The constant 31K, small magnitudes of 1/T1T, along with the
resistivity r... | 1403.4458v1 |
2014-09-16 | Sensitivity to small perturbations in systems of large quantum spins | We investigate the sensitivity of nonintegrable large-spin quantum lattices
to small perturbations with a particular focus on the time reversal experiments
known in statistical physics as "Loschmidt echoes" and in nuclear magnetic
resonance (NMR) as "magic echoes". Our numerical simulations of quantum
spin-$7\frac{1}{2... | 1409.4763v1 |
2014-09-22 | All optical control of a single electron spin in diamond | Precise coherent control of the individual electronic spins associated with
atom-like impurities in the solid state is essential for applications in
quantum information processing and quantum metrology. We demonstrate
all-optical initialization, fast coherent manipulation, and readout of the
electronic spin of the nega... | 1409.6372v1 |
2015-02-24 | Spin rectification for collinear and non-collinear magnetization and external magnetic field configurations | Spin rectification in a single crystal Fe/Au/Fe sandwich is electrically
detected for collinear and non-collinear magnetization and external magnetic
field configurations. The line shape, line width and signal polarity are
analysed. The spin rectication theory has been much extended by taking the
magneto-crystalline an... | 1502.06859v1 |
2015-04-08 | Electron spin polarization by isospin ordering in correlated two-layer quantum Hall systems | Enhancement of the electron spin polarization in a correlated two-layer
two-dimensional electron system at a total Landau level filling factor of one
is reported. Using resistively detected nuclear magnetic resonance, we
demonstrate that the electron spin polarization of two closely-spaced
two-dimensional electron syst... | 1504.02007v1 |
2015-09-14 | Spin measurement using cycling transitions of a two-electron quantum dot molecule | Two-electron charged self-assembled quantum dot molecules exhibit a
decoherence-avoiding singlet-triplet qubit subspace and an efficient
spin-photon interface. Here, we demonstrate that the cycling transitions
originating from auxiliary ground states in the same system allow for an
efficient optical read-out of a singl... | 1509.04171v1 |
2018-06-21 | Pulse sequences for controlled 2- and 3-qubit gates in a hybrid quantum register | We propose and demonstrate a quantum control scheme for hybrid quantum
registers that can reduce the operation time, and therefore the effects of
relaxation, compared to existing implementations. It combines resonant
excitation pulses with periods of free precession under the internal
Hamiltonian of the qubit system. W... | 1806.08408v1 |
2018-09-07 | Optimal Spin Squeezed Steady State induced by the dynamics of non-hermtian hamiltonians | In this work, we study the time evolution of a coherent spin state under the
action of a non-hermitian hamiltonian. The hamiltonian is modeled by a one-axis
twisting term plus a Lipkin-type interaction. We show that when the Lipkin
interaction is switched on, depending on the relative values of the coupling
constants, ... | 1809.02683v1 |
2012-09-12 | Coherent spin control by electrical manipulation of the magnetic anisotropy | High-spin paramagnetic manganese defects in polar piezoelectric zinc oxide
exhibit a simple almost axial anisotropy and phase coherence times of the order
of a millisecond at low temperatures. The anisotropy energy is tunable using an
externally applied electric field. This can be used to control electrically the
phase... | 1209.2745v2 |
2012-09-19 | Dynamical evolution of an inverted spin ensemble in a cavity: Inhomogeneous broadening as a stabilizing mechanism | We study the evolution of an inverted spin ensemble coupled to a cavity. The
inversion itself presents an inherent instability of the system; however, the
inhomogeneous broadening of spin-resonance frequencies presents a stabilizing
mechanism, and a stability criterion is derived. The detailed behavior of mean
values a... | 1209.4167v1 |
2018-12-30 | Entangling and squeezing atoms by weak measurement | A weak measurement approach is proposed to entangle and squeeze atoms. We
show that even for very small coupling strength between light and atoms, one
can achieve large squeezing unattainable with normal measurement-based
squeezing. Post-selecting the photons interacting with spins via a weak
off-resonant quantum nonde... | 1812.11548v1 |
2017-02-24 | Elucidation of the helical spin structure of FeAs | We present the results of resonant x-ray scattering measurements and
electronic structure calculations on the monoarsenide FeAs. We elucidate
details of the magnetic structure, showing the ratio of ellipticity of the spin
helix is larger than previously thought, at 2.58(3), and reveal both a
right-handed chirality and ... | 1702.07660v1 |
2018-04-04 | Independence of spin-orbit torques from the exchange bias direction in Ni$_{81}$Fe$_{19}$/IrMn bilayers | We investigated a possible correlation between spin Hall angles and exchange
bias in Ni$_{81}$Fe$_{19}$/IrMn samples by performing spin torque ferromagnetic
resonance measurements. This correlation is probed by patterning of
Ni$_{81}$Fe$_{19}$/IrMn bilayers in different relative orientations with
respect to the exchang... | 1804.01612v1 |
2019-03-29 | Adiabatic population transfer of dressed spin states with quantum optimal control | We report theoretical studies of adiabatic population transfer using dressed
spin states. Quantum optimal control using the algorithm of Chopped Random
Basis (CRAB) has been implemented in a negatively charged diamond nitrogen
vacancy center that is coupled to a strong and resonant microwave field. We
show that the dre... | 1903.12651v1 |
2021-08-02 | Trapping the carrier in the spin-locked MoS2 atomic valley by absorption of chiral L-cysteine | This work, demonstrate enhanced valley contrasting spin-momentum locked
chiral states at van der Waal interface of chiral L-cysteine and
mono-atomically thin MoS2 placed at Si/SiO2 substrate at ambient condition.
Helicity dependent photoluminescence and resonance Raman measurement highlights
spin-locked transitions for... | 2108.01106v2 |
2008-06-24 | Spin-vortex nucleation in a Bose-Einstein condensate by a spin-dependent rotating trap | A method to produce a spin-dependent rotating potential using near-resonant
circularly polarized laser beams is proposed. It is shown that half-quantum
vortices are nucleated in a spinor Bose-Einstein condensate with an
antiferromagnetic interaction. In contrast to the vortex nucleation in a scalar
BEC, the spin-vortex... | 0806.3840v1 |
2019-01-29 | Electron interferometry and quantum spin Hall phase in silicene | We discuss devices for detection of the topological insulator phase based on
the two-path electron interference. For that purpose we consider buckled
silicene for which a local energy gap can be opened by vertical electric field
to close one of the paths and for which the quantum spin Hall insulator
conditions are cont... | 1901.10161v1 |
2021-01-20 | Twisted light-induced spin-spin interaction in a chiral helimagnet | We theoretically investigate how the orbital angular momentum of light can
affect a chiral magnetic order. Here, we consider a metallic chiral helimagnet,
which is under stationary radiation of a resonant optical vortex beam. We
propose a novel interaction between local spins considering microscopic
interactions betwee... | 2101.10131v2 |
2021-11-09 | Parametric mechanism of magnetization reversal in FeCoB nanomagnet by a magnetic field of spin-accumulated electrons | Spin-polarized electrons are accumulated at nanomagnet boundaries due to the
Spin Hall effect. The small magnetic field, which is induced by the spin
accumulation, is able to reverse the nanomagnet magnetization when the
conditions of parametric resonance are met. The features of this parametric
mechanism of magnetizat... | 2111.05438v1 |
2021-12-22 | Observation of quantum phase-synchronization in a nuclear spin-system | We report an experimental study of phase-synchronization in a pair of
interacting nuclear spins subjected to an external drive in nuclear magnetic
resonance architecture. A weak transition-selective radio-frequency field
applied on one of the spins is observed to cause phase-localization, which is
experimentally establ... | 2112.12088v2 |
2022-01-28 | Theory of spin-excitation anisotropy in the nematic phase of FeSe obtained from RIXS measurements | Recent resonant inelastic x-ray scattering (RIXS) experiments have detected a
significant high-energy spin-excitation anisotropy in the nematic phase of the
enigmatic iron-based superconductor FeSe, whose origin remains controversial.
We apply an itinerant model previously used to describe the spin-excitation
anisotrop... | 2201.12008v2 |
2022-07-15 | Target normal single-spin asymmetry in inclusive electron-nucleon scattering with two-photon exchange: Analysis using $1/N_c$ expansion | We calculate the target normal single-spin asymmetry caused by two-photon
exchange in inclusive electron-nucleon scattering in the resonance region. Our
analysis uses the $1/N_c$ expansion of low-energy QCD and combines $N$ and
$\Delta$ intermediate and final states using the contracted $SU(4)$ spin-flavor
symmetry. Th... | 2207.07588v1 |
2023-11-24 | Plasmonically engineered nitrogen-vacancy spin readout | Ultra-precise readout of single nitrogen-vacancy (NV) spins hold promise for
major advancements in quantum sensing and computing technologies. We predict
significant brightness and contrast enhancements in NV spin qubit readout and
optically detected magnetic resonance (ODMR) arising from plasmonic
interaction. We pres... | 2311.14266v1 |
1999-05-20 | Spin dynamics simulation of the three-dimensional XY model: Structure factor and transport properties | We present extensive Monte-Carlo spin dynamics simulations of the classical
XY model in three dimensions on a simple cubic lattice with periodic boundary
conditions. A recently developed efficient integration algorithm for the
equations of motion is used, which allows a substantial improvement of
statistics and large i... | 9905295v1 |
2000-12-01 | Magnetic and orbital ordering in cuprates and manganites | The mechanisms of magnetic and orbital interactions due to double exchange
(DE) and superexchange (SE) in transition metal oxides with degenerate e_g
orbitals are presented. Specifically, we study the effective spin-orbital
models derived for the d^9 ions as in KCuF_3, and for the d^4 ions as in
LaMnO_3, for spins S=1/... | 0012013v1 |
2005-08-08 | Site dilution of quantum spins in the honeycomb lattice | We discuss the effect of site dilution on both the magnetization and the
density of states of quantum spins in the honeycomb lattice, described by the
antiferromagnetic Heisenberg spin-S model. For this purpose a real-space
Bogoliubov-Valatin transformation is used. In this work we show that for the
S>1/2 the system ca... | 0508204v1 |
2007-02-01 | Intensity of Brillouin light scattering from spin waves in magnetic multilayers with noncollinear spin configurations: Theory and experiment | The scattering of photons from spin waves (Brillouin light scattering -- BLS)
is a well-established technique for the study of layered magnetic systems. The
information about the magnetic state and properties of the sample is contained
in the frequency position, width, and intensity of the BLS peaks. Previously
[Phys. ... | 0702021v1 |
2013-11-11 | Three-dimensional light-matter interface for collective spin squeezing in atomic ensembles | We study the three-dimensional nature of the quantum interface between an
ensemble of cold, trapped atomic spins and a paraxial laser beam, coupled
through a dispersive interaction. To achieve strong entanglement between the
collective atomic spin and the photons, one must match the spatial mode of the
collective radia... | 1311.2328v2 |
2018-03-23 | Direct observation of incommensurate magnetism in Hubbard chains | The interplay between magnetism and doping is at the origin of exotic
strongly correlated electronic phases and can lead to novel forms of magnetic
ordering. One example is the emergence of incommensurate spin-density waves
with a wave vector that does not match the reciprocal lattice. In one dimension
this effect is a... | 1803.08892v1 |
2020-11-09 | Classical many-body chaos with and without quasiparticles | We study correlations, transport and chaos in a Heisenberg magnet as a
classical model many-body system. By varying temperature and dimensionality, we
can tune between settings with and without symmetry breaking and accompanying
collective modes or quasiparticles. We analyse both conventional and
out-of-time-ordered sp... | 2011.04700v1 |
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