publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2022-01-30 | Port Reconfigurable Phase-Change Optical Resonator | Active control and manipulation of electromagnetic waves are highly desirable
for advanced photonic device technology, such as optical cloaking, active
camouflage and information processing. Designing optical resonators with high
ease-of-control and reconfigurability remains a open challenge thus far. Here
we propose a... | 2201.12800v1 |
2022-02-01 | Pion axioproduction: The Delta resonance contribution | The process of pion axioproduction, $aN\to\pi N$, with an intermediate
$\Delta$ resonance is analyzed using baryon chiral parturbation theory. The
$\Delta$ resonance is included in two ways: First, deriving the $a\Delta
N$-vertices, the axion is brought into contact with the resonance, and, second,
taking the results o... | 2202.00268v2 |
2022-03-01 | Determination of atomic multiphoton ionization phases by trichromatic multichannel wave packet interferometry | We present a multichannel photoelectron interferometry technique based on
trichromatic pulse shaping for unambiguous determination of quantum phases in
multiphoton ionization (MPI) of potassium atoms. The colors of the laser field
are chosen to produce three energetically separated photoelectron
interferograms in the c... | 2203.00323v2 |
2022-03-21 | Computation of eigenfrequency sensitivities using Riesz projections for efficient optimization of nanophotonic resonators | Resonances are omnipresent in physics and essential for the description of
wave phenomena. We present an approach for computing eigenfrequency
sensitivities of resonances. The theory is based on Riesz projections and the
approach can be applied to compute partial derivatives of the complex
eigenfrequencies of any reson... | 2203.11101v2 |
2022-06-22 | Neolithic stone settlements as locally resonant metasurfaces | We study the dynamic surface response of neolithic stone settlements obtained
with seismic ambient noise techniques near the city of Carnac in French
Brittany. Surprisingly, we find that menhirs (neolithic human size standing
alone granite stones) with an aspect ratio between 1 and 2 periodically
arranged atop a thin l... | 2206.10825v1 |
2022-12-26 | On phase at a resonance in slow-fast Hamiltonian systems | We consider a slow-fast Hamiltonian system with one fast angular variable (a
fast phase) whose frequency vanishes on some surface in the space of slow
variables (a resonant surface). Systems of such form appear in the study of
dynamics of charged particles in inhomogeneous magnetic field under influence
of a high-frequ... | 2212.13293v1 |
2023-04-03 | Improved constraints on minimum length models with a macroscopic low loss phonon cavity | Many theories that attempt to formulate a quantum description of gravity
suggest the existence of a fundamental minimum length scale. A popular method
for incorporating this minimum length is through a modification of the
Heisenberg uncertainty principle known as the generalised uncertainty principle
(GUP). Experimenta... | 2304.00688v2 |
2023-04-09 | Beyond 5 GHz excitation of a ZnO-based high-overtone bulk acoustic resonator on SiC substrate | This work describes the fabrication and characterization of an
Au/ZnO/Pt-based high-overtone bulk acoustic resonator (HBAR) on SiC substrates.
We evaluate its microwave characteristics comparing with Si substrates for
micro-electromechanical applications. Dielectric magnetron sputtering and an
electron beam evaporator ... | 2304.04286v1 |
2023-09-21 | Simultaneous Resonant and Broadband Detection for Dark Sectors | Electromagnetic resonant systems, such as cavities or LC circuits, have
emerged as powerful detectors for probing ultralight boson dark matter and
high-frequency gravitational waves. However, the limited resonant bandwidth of
conventional single-mode resonators, imposed by quantum fluctuations,
necessitates numerous sc... | 2309.12387v1 |
2024-01-08 | Room-Temperature Plasmon-Assisted Resonant THz Detection in Single-layer Graphene Transistors | Frequency-selective or even frequency-tunable Terahertz (THz) photodevices
are critical components for many technological applications that require
nanoscale manipulation, control and confinement of light. Within this context,
gate-tunable phototransistors based on plasmonic resonances are often regarded
as the most pr... | 2401.04005v1 |
2024-02-08 | Extinction of guided light induced by coupled spiral meta-atom resonators at arbitrary order exceptional points | Exceptional points (EPs) in non-Hermitian systems can give rise to intriguing
effects not available in conventional Hermitian systems due to their unusual
properties. Using full-wave simulations, we investigate the scattering,
absorption, and transmission of guided light at arbitrary order exceptional
points in a non-H... | 2402.06686v1 |
1999-08-24 | Spin Dynamics of Rare Earth Ions in Phosphate Laser Glasses | The spin dynamics of rare earth ions (Er, Nd, Sm and Gd) in heavily doped
phosphate glasses have been investigated using 31P NMR. Correlation times in
the range 10^-2 to 10^-12 s have been obtained for temperatures between 4 K and
100 K. No evidence of spin-spin coupling between the ions has been found and
spin relaxat... | 9908333v1 |
2000-07-25 | Spin-lattice relaxation in the mixed state of the high-$T_c$ cuprates: electronic spin-flip scattering versus spin-fluctuations | Recent experimental and theoretical studies have established that the
spin-lattice relaxation rate, $1/T_1$, measured in nuclear magnetic resonance
(NMR) experiments is a site-sensitive probe for the electronic spectrum in the
mixed state of the high-$T_c$ cuprates. While some groups suggested that
$1/T_1$ is solely de... | 0007393v1 |
2001-07-10 | Cu NQR study of host and guest spin dynamics in impurity-doped YBa2Cu4O8 | We present the planar 63Cu nuclear spin-lattice relaxation study of
impurity-doped YBa2(Cu1-xMx)4O8 (M=Ni, Zn) at T=4.2-300 K with Cu nuclear
quadrupole resonance (NQR) spin-echo technique. In the light of an
impurity-induced NQR relaxation theory, we estimated the host Cu nuclear
spin-lattice relaxation time (T1)HOST,... | 0107186v1 |
2002-09-24 | Nonequilibrium spin fluctuations in single-electron transistors | We show that nonequilibrium spin fluctuations significantly influence the
electronic transport in a single-electron transistor, when the spin relaxation
on the island is slow compared to other relaxation processes, and when size
effects play a role. To describe spin fluctuations we generalize the `orthodox'
tunneling t... | 0209559v1 |
2003-02-24 | Detection of electrical spin injection by light-emitting diodes in top- and side-emission configuration | Detection of the degree of circular polarization of the electroluminescence
of a light-emitting diode fitted with a spin injecting contact (a spin-LED)
allows for a direct determination of the spin polarization of the injected
carriers. Here, we compare the detection efficiency of (Al,Ga)As spin-LEDs
fitted with a (Zn,... | 0302477v1 |
2004-01-03 | Spin-lattice relaxation rate of a magnetic impurity in the spin degenerate Anderson model | The renormalization group formalism was applied to calculate the spin-lattice
relaxation rate of a well-defined magnetic moment in the neighborhood of a spin
degenerate Anderson impurity. In the Kondo regime, the spin-lattice relaxation
rate as a function of the temperature presents a peak at the Kondo temperature;
for... | 0401022v1 |
2005-05-02 | Absence of spin superradiance in resonatorless magnets | A spin system is considered with a Hamiltonian typical of molecular magnets,
having dipole-dipole interactions and a single-site magnetic anisotropy. In
addition, spin interactions through the common radiation field are included. A
fully quantum-mechanical derivation of the collective radiation rate is
presented. An ef... | 0505024v1 |
2006-05-08 | Spin-orbit effects in GaAs quantum wells: Interplay between Rashba, Dresselhaus, and Zeeman interactions | The interplay between Rashba, Dresselhaus and Zeeman interactions in a
quantum well submitted to an external magnetic field is studied by means of an
accurate analytical solution of the Hamiltonian, including electron-electron
interactions in a sum rule approach. This solution allows to discuss the
influence of the spi... | 0605199v1 |
2006-10-17 | The spin state transition in LaCoO$_{3}$; revising a revision | Using soft x-ray absorption spectroscopy and magnetic circular dichroism at
the Co-$L_{2,3}$ edge we reveal that the spin state transition in LaCoO$_{3}$
can be well described by a low-spin ground state and a triply-degenerate
high-spin first excited state. From the temperature dependence of the spectral
lineshapes we ... | 0610457v1 |
2007-01-15 | Decoherence induced by anisotropic hyperfine interaction in Si spin qubits | We study Si:P donor electron spin decoherence due to anisotropic hyperfine
(AHF) interaction with the surrounding nuclear spin bath. In particular, we
clarify the electron spin echo envelope modulation (ESEEM) in the Si:P system
and the resonancelike contributions from nuclear spins in various shells away
from the P at... | 0701341v2 |
2004-09-12 | Energy levels and decoherence properties of single electron and nuclear spins in a defect center in diamond | The coherent behavior of the single electron and single nuclear spins of a
defect center in diamond and a 13C nucleus in its vicinity, respectively, are
investigated. The energy levels associated with the hyperfine coupling of the
electron spin of the defect center to the 13C nuclear spin are analyzed.
Methods of magne... | 0409067v1 |
2004-11-18 | Entanglement Assisted Metrology | We propose a new approach to the measurement of a single spin state, based on
nuclear magnetic resonance (NMR) techniques and inspired by the coherent
control over many-body systems envisaged by Quantum Information Processing
(QIP). A single target spin is coupled via the natural magnetic dipolar
interaction to a large... | 0411128v1 |
2007-07-09 | Coherence of an optically illuminated single nuclear spin qubit | We investigate the coherence properties of individual nuclear spin quantum
bits in diamond [Dutt et al., Science, 316, 1312 (2007)] when a proximal
electronic spin associated with a nitrogen-vacancy (NV) center is being
interrogated by optical radiation. The resulting nuclear spin dynamics are
governed by time-dependen... | 0707.1341v2 |
2007-10-11 | Electrically Tunable Spin Polarization in a Carbon-Nanotube Spin Diode | We have studied the current through a carbon nanotube quantum dot with one
ferromagnetic and one normal-metal lead. For the values of gate voltage at
which the normal lead is resonant with the single available non-degenerate
energy level on the dot, we observe a pronounced decrease in the current for
one bias direction... | 0710.2297v1 |
2008-11-25 | Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors | We develop an understanding of the anomalous metal state of the parent
compounds of recently discovered iron based superconductors starting from a
strong coupling viewpoint, including orbital degrees of freedom. On the basis
of an intermediate-spin (S=1) state for the Fe^{2+} ions, we derive a
Kugel-Khomskii spin-orbit... | 0811.4104v1 |
2009-01-05 | Coherence and control of quantum registers based on electronic spin in a nuclear spin bath | We consider a protocol for the control of few-qubit registers comprising one
electronic spin embedded in a nuclear spin bath. We show how to isolate a few
proximal nuclear spins from the rest of the environment and use them as
building blocks for a potentially scalable quantum information processor. We
describe how coh... | 0901.0444v1 |
2009-01-14 | Ab-initio calculations of spin tunneling through an indirect barrier | We use a fully relativistic layer Green's functions approach to investigate
spin-dependent tunneling through a symmetric indirect band gap barrier like
GaAs/AlAs/GaAs heterostructure along [100] direction. The method is based on
Linear Muffin Tin Orbitals and it is within the Density Functional Theory (DFT)
in the Loca... | 0901.2021v1 |
2009-02-19 | Kondo screening suppression by spin-orbit interaction in quantum dots | We study the transport properties of a quantum dot embedded in an
Aharonov-Bohm ring in the presence of spin-orbit interactions. Using a
numerical renormalization group analysis of the system in the Kondo regime, we
find that the competition of Aharonov-Bohm and spin-orbit dynamical phases
induces a strong suppression ... | 0902.3310v1 |
2009-03-11 | Nanomechanical Detection of Itinerant Electron Spin Flip | Spin is an intrinsically quantum property, characterized by angular momentum.
A change in the spin state is equivalent to a change in the angular momentum or
mechanical torque. This spin-induced torque has been invoked as the intrinsic
mechanism in experiments ranging from the measurements of angular momentum of
photon... | 0903.1894v1 |
2009-04-08 | Architecture for high-sensitivity single-shot readout and control of the electron spin of individual donors in silicon | We describe a method to control and detect in single-shot the electron spin
state of an individual donor in silicon with greatly enhanced sensitivity. A
silicon-based Single-Electron Transistor (SET) allows for spin-dependent
tunneling of the donor electron directly into the SET island during the
read-out phase. Simula... | 0904.1271v4 |
2009-12-25 | Faraday Rotation with Single Nuclear Spin Qubit in a High-Finesse Optical Cavity | When an off-resonant light field is coupled with atomic spins, its
polarization can rotate depending on the direction of the spins via a Faraday
rotation which has been used for monitoring and controlling the atomic spins.
We observed Faraday rotation by an angle of more than 10 degrees for a single
1/2 nuclear spin of... | 0912.4948v3 |
2011-04-22 | High spin states of cation vacancies in GaP, GaN, AlN, BN, ZnO and BeO: A first principles study | High spin states of cation vacancies in GaP, GaN, AlN, BN, ZnO and BeO were
analyzed by first principles calculations. The spin-polarized vacancy-induced
level is located in the band gap in GaP, ZnO and BeO. In the nitrides, the
stronger exchange coupling forces the vacancy states to be resonant with
valence bands, for... | 1104.4420v1 |
2012-03-05 | Coherent multi-flavour spin dynamics in a fermionic quantum gas | Microscopic spin interaction processes are fundamental for global static and
dynamical magnetic properties of many-body systems. Quantum gases as pure and
well isolated systems offer intriguing possibilities to study basic magnetic
processes including non-equilibrium dynamics. Here, we report on the
realization of a we... | 1203.0948v1 |
2012-04-02 | Spin dynamics of S-state ions in the filled skutterudites La1-xRx$Pt4Ge12 (R= Gd, Eu) | A detailed study of the spin dynamics of the S-state ions Gd3+ and Eu2+ in
the filled skutterudites La1-xRxPt4Ge12 (R= Gd, Eu) is reported. The spin
dynamics is investigated directly by means of Gd3+ and Eu2+ electron spin
resonance (ESR), performed at X-band (~ 9.4 GHz) and Q-band (~ 34 GHz)
frequencies in the tempera... | 1204.0481v1 |
2012-04-13 | High resolution spectroscopy of single NV defects coupled with nearby $^{13}$C nuclear spins in diamond | We report a systematic study of the hyperfine interaction between the
electron spin of a single nitrogen-vacancy (NV) defect in diamond and nearby
$^{13}$C nuclear spins, by using pulsed electron spin resonance spectroscopy.
We isolate a set of discrete values of the hyperfine coupling strength ranging
from 14 MHz to 4... | 1204.2947v1 |
2012-05-25 | Study of two-spin entanglement in singlet states | We study the entanglement properties of two-spin subsystems in spin-singlet
states. The average entanglement between two spins is maximized in a single
valence-bond (VB) state. On the other hand, $E_v^2$ (the average entanglement
between a subsystem of two spins and the rest of the system) can be maximized
through a ho... | 1205.5667v3 |
2012-08-30 | Generation of spin-polarized current using multi-terminated quantum dot with spin-orbit interaction | We theoretically examine generation of spin-polarized current using
multi-terminated quantum dot with spin-orbit interaction. First, a two-level
quantum dot is analyzed as a minimal model, which is connected to $N$ ($\ge 2$)
external leads via tunnel barriers. When an unpolarized current is injected to
the quantum dot ... | 1208.6084v1 |
2013-01-14 | Spin coherent states in NMR quadrupolar system: experimental and theoretical applications | Working with nuclear magnetic resonance (NMR) in quadrupolar spin systems, in
this paper we transfer the concept of atomic coherent state to the nuclear spin
context, where it is referred to as pseudo-nuclear spin coherent state
(pseudo-NSCS). Experimentally, we discuss the initialization of the
pseudo-NSCSs and also t... | 1301.2862v1 |
2013-05-03 | Dependence of spin pumping spin Hall effect measurements on layer thicknesses and stacking order | Voltages generated from inverse spin Hall and anisotropic magneto-resistance
effects via spin pumping in ferromagnetic (F)/non-magnetic (N) bilayers are
investigated by means of a broadband ferromagnetic resonance approach. Varying
the non-magnetic layer thickness enables the determination of the spin
diffusion length ... | 1305.0745v2 |
2013-05-31 | Enhanced hyperfine-induced spin dephasing in a magnetic-field gradient | Magnetic-field gradients are important for single-site addressability and
electric-dipole spin resonance of spin qubits in semiconductor devices. We show
that these advantages are offset by a potential reduction in coherence time due
to the non-uniformity of the magnetic field experienced by a nuclear-spin bath
interac... | 1305.7506v2 |
2013-07-06 | Probing the Spin Pumping Mechanism: Exchange Coupling with Exponential Decay in Y3Fe5O12/barrier/Pt Heterostructures | Ferromagnetic resonance driven spin pumping of pure spin currents from a
ferromagnet into a nonmagnetic material promises new spin-functional devices
with low energy consumption. The mechanism of spin pumping is under intense
investigation and it is widely believed that exchange interaction between the
ferromagnet and ... | 1307.1816v2 |
2013-10-13 | Optically-driven nuclear-spin-selective Rabi oscillations of single electron spins in diamond | Optically-driven Rabi oscillations of single electron spins in a diamond
nitrogen vacancy center are realized with two Raman-resonant optical pulses
that are detuned from the respective dipole optical transitions. The Rabi
oscillations are nuclear-spin selective and are robust against rapid
decoherence of the underlyin... | 1310.3525v1 |
2013-10-24 | Dynamics in spinor condensates controlled by a microwave dressing field | We experimentally study spin dynamics in a sodium antiferromagnetic spinor
condensate with off-resonant microwave pulses. In contrast to a magnetic field,
a microwave dressing field enables us to explore rich spin dynamics under the
influence of a negative net quadratic Zeeman shift $q_{\rm net}$. We find an
experiment... | 1310.6785v1 |
2013-11-26 | Electrically and mechanically tunable electron spins in silicon carbide color centers | The electron spins of semiconductor defects can have complex interactions
with their host, particularly in polar materials like SiC where electrical and
mechanical variables are intertwined. By combining pulsed spin resonance with
ab-initio simulations, we show that spin-spin interactions within SiC neutral
divacancies... | 1311.6832v1 |
2013-11-28 | Dynamic Spin Fluctuations at $T\rightarrow 0$ in a Spin-1/2 Ferromagnetic Kagome Lattice | We report magnetization, electron spin resonance (ESR), and muon spin
relaxation ($\mu $SR) measurements on single crystals of the $S=1/2$ (Cu$%
^{+2}$) kagom\'{e} compound Cu(1,3-benzendicarboxylate). The $\mu $SR is
carried to temperatures as low as 45 mK. The spin Hamiltonian parameters are
determined from the analy... | 1311.7411v1 |
2013-12-10 | Optical signatures of silicon-vacancy spins in diamond | Colour centres in diamond have emerged as versatile tools for solid-state
quantum technologies ranging from quantum information to metrology, where the
nitrogen-vacancy centre is the most studied to-date. Recently, this toolbox has
expanded to include different materials for their nanofabrication
opportunities, and nov... | 1312.2997v1 |
2013-12-17 | High-fidelity adiabatic inversion of a $^{31}\mathrm{P}$ electron spin qubit in natural silicon | The main limitation to the high-fidelity quantum control of spins in
semiconductors is the presence of strongly fluctuating fields arising from the
nuclear spin bath of the host material. We demonstrate here a substantial
improvement in single-qubit gate fidelities for an electron spin qubit bound to
a $^{31}$P atom in... | 1312.4647v1 |
2013-12-17 | Low energy magnetic excitations in the spin-orbital Mott insulator Sr$_2$IrO$_4$ | We report a high-field electron spin resonance study in the sub-THz frequency
domain of a single crystal of Sr$_2$IrO$_4$ that has been recently proposed as
a prototypical spin-orbital Mott insulator. In the antiferromagnetically (AFM)
ordered state with noncollinear spin structure that occurs in this material at
$T_{\... | 1312.4847v2 |
2013-12-30 | Indirect control of spin precession by electric field via spin-orbit coupling | The spin-orbit coupling (SOC) can mediate electric-dipole spin resonance
(EDSR) in an a.c. electric field. In this letter, the EDSR is essentially
understood as an spin precession under an effective a.c. magnetic field induced
by the SOC in the reference frame, which is exactly following the classical
trajectory of the... | 1312.7635v3 |
2014-01-06 | The empirical Monod-Beuneu relation of spin-relaxation revisited for elemental metals | Monod and Beuneu [Monod and Beuneu, Phys. Rev. B 19, 911 (1979)] established
the validity of the Elliott-Yafet theory for elemental metals through
correlating the experimental electron spin resonance line-width with the
so-called spin-orbit admixture coefficients and the momentum-relaxation theory.
The spin-orbit admix... | 1401.1048v1 |
2014-03-11 | Spin squeezing in an ensemble of quadrupolar nuclei NMR system | We have characterized spin-squeezed states produced at a temperature of
$26^\circ{\mathrm C}$ on a Nuclear Magnetic Resonance (NMR) quadrupolar system.
The implementation is carried out in an ensemble of $^{133}$Cs nuclei with spin
$I=7/2$ of a lyotropic liquid crystal sample. We identify the source of spin
squeezing d... | 1403.2706v1 |
2014-08-11 | Hole spin dynamics and hole $g$ factor anisotropy in coupled quantum well systems | Due to its p-like character, the valence band in GaAs-based heterostructures
offers rich and complex spin-dependent phenomena. One manifestation is the
large anisotropy of Zeeman spin splitting. Using undoped, coupled quantum wells
(QWs), we examine this anisotropy by comparing the hole spin dynamics for high-
and low-... | 1408.2360v1 |
2014-09-02 | Quantum spin coherence in halogen-modified Cr$_7$Ni molecular nanomagnets | Among the factors determining the quantum coherence of the spin in molecular
magnets is the presence and the nature of nuclear spins in the molecule. We
have explored modifying the nuclear spin environment in Cr$_7$Ni-based
molecular nanomagnets by replacing hydrogen atoms with deuterium or the halogen
atoms, fluorine ... | 1409.0821v2 |
2014-09-16 | Phonon-modulated magnetic interactions and spin Tomonaga-Luttinger liquid in the p-orbital antiferromagnet CsO2 | The magnetic response of antiferromagnetic CsO2, coming from the p-orbital
S=1/2 spins of anionic O2- molecules, is followed by 133Cs nuclear magnetic
resonance across the structural phase transition occuring at Ts1=61 K on
cooling. Above Ts1, where spins form a square magnetic lattice, we observe a
huge, nonmonotonic ... | 1409.4818v2 |
2014-09-22 | Donor Spin Qubits in Ge-based Phononic Crystals | We propose qubits based on shallow donor electron spins in germanium.
Spin-orbit interaction for donor spins in germanium is in many orders of
magnitude stronger than in silicon. In a uniform bulk material it leads to very
short spin lifetimes. However the lifetime increases dramatically when the
donor is placed into a... | 1409.6285v1 |
2014-11-28 | Position-dependent spin-orbit coupling for ultracold atoms | We theoretically explore atomic Bose-Einstein condensates (BECs) subject to
position-dependent spin-orbit coupling (SOC). This SOC can be produced by
cyclically laser coupling four internal atomic ground (or metastable) states in
an environment where the detuning from resonance depends on position. The
resulting spin-o... | 1411.7813v2 |
2015-01-19 | Effect of Exchange Interaction on Magnetic Thermal Fluctuation and Spin Susceptibility | The expression of the thermal fluctuation parameter in the stochastic
Landau-Lifshitz-Gilbert equation has been derived from a fundamental quantum
theory of spins and phonons, in which the exchange interaction between nearest
atoms has been included. Our studies show that the thermal fluctuation
decreases exponentially... | 1501.04503v2 |
2015-02-13 | Coherent heteronuclear spin dynamics in an ultracold spin-1 mixture | We report the observation of coherent heteronuclear spin dynamics driven by
inter-species spin-spin interaction in an ultracold spinor mixture, which
manifests as periodical and well correlated spin oscillations between two
atomic species. In particular, we investigate the magnetic field dependence of
the oscillations ... | 1502.03867v1 |
2015-02-13 | Antiferromagnet-Mediated Spin Transfer Between Metal and Ferromagnet | We develop a theory for spin transported by coherent Neel dynamics through an
antiferromagnetic insulator coupled to a ferromagnetic insulator on one side
and a current-carrying normal metal with strong spin-orbit coupling on the
other. The ferromagnet is considered within the mono-domain limit and we assume
its coupli... | 1502.04128v1 |
2015-04-03 | Single-shot measurement of transient nuclear magnetization with spin-noise spectroscopy in n-GaAs microcavities | We exploit spin noise spectroscopy (SNS) to directly observe build-up of
dynamic nuclear polarization and relaxation of a perturbed nuclear spin-system
to its equilibrium state in a single-shot experiment. The SNS experiments were
performed on a layer of bulk $n$-type GaAs embedded into a high-finesse
microcavity with ... | 1504.00799v1 |
2015-05-15 | Direct detection of pure spin-current by x-ray pump-probe measurements | By synchronizing a microwave waveform with the synchrotron x-ray pulses, we
use the ferromagnetic resonance (FMR) of the Py (Ni81Fe19) layer in a
Py/Cu/Cu75Mn25/Cu/Co multilayer to pump a pure spin current into the Cu75Mn25
spacer layer, and then directly probe the spin current in the Cu75Mn25 layer by
a time-resolved ... | 1505.03959v2 |
2015-07-06 | Nuclear spin noise in NMR revisited | The theoretical shapes of nuclear spin-noise spectra in NMR are derived by
considering a receiver circuit with finite, preamplifier input impedance and a
transmission line between the preamplifier and the probe. Using this model, it
becomes possible to reproduce all observed experimental features: variation of
the NMR ... | 1507.01398v2 |
2015-08-11 | Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr$_2$CuO$_3$ | The $S=1/2$ antiferromagnetic Heisenberg spin chain compound Sr$_2$CuO$_3$
doped with $1 \%$ and $2 \%$ of Ni impurities has been studied by means of
$^{63}$Cu nuclear magnetic resonance. A strong decrease of the spin-lattice
relaxation rate $T_1^{-1}$ at low temperatures points toward a spin gap, while
a stretching ex... | 1508.02529v1 |
2015-08-26 | Multistability and spin diffusion enhanced lifetimes in dynamic nuclear polarization in a double quantum dot | The control of nuclear spins in quantum dots is essential to explore their
many-body dynamics and exploit their prospects for quantum information
processing. We present a unique combination of dynamic nuclear spin
polarization and electric-dipole-induced spin resonance in an electrostatically
defined double quantum dot... | 1508.06522v2 |
2015-09-03 | Long-lived states with well-defined spins in spin-$1/2$ homogeneous Bose gases | Many-body eigenfunctions of the total spin operator can be constructed from
the spin and spatial wavefunctions with non-trivial permutation symmetries.
Spin-dependent interactions can lead to relaxation of the spin eigenstates to
the thermal equilibrium. A mechanism that stabilizes the many-body entangled
states is pro... | 1509.01264v3 |
2016-01-20 | Enhanced photonic spin Hall effect with subwavelength topological edge states | Photonic structures offer unique opportunities for controlling light-matter
interaction, including the photonic spin Hall effect associated with the
transverse spin-dependent displacement of light that propagates in specially
designed optical media. However, due to small spin-orbit coupling, the photonic
spin Hall effe... | 1601.05264v1 |
2016-04-10 | Measurement of spin coherence using Raman scattering | Ramsey interferometry provides a natural way to determine the coherence time
of most qubit systems. Recent experiments on quantum dots however, demonstrated
that dynamical nuclear spin polarization can strongly influence the measurement
process, making it difficult to extract the $T_2^*$ coherence time using
optical Ra... | 1604.02685v1 |
2016-04-27 | Spin exchange collision mixing of the K and Rb ac Stark shifts | In a hybrid pumping alkali vapor cell that both K and Rb are filled, K atom
spins are optically pumped by laser and Rb atom spins are polarized by the K
spins through spin exchange. We find that the AC Stark shift of the Rb atoms is
composed of not only the AC Stark shift of the Rb atoms caused by the far off
resonant ... | 1604.07908v1 |
2016-05-16 | Spin-polarization in the vicinity of quantum point contact with spin-orbit interaction | We have developed a novel technique for detection of spin polarization with a
quantum dot weakly coupled to the objective device. The disturbance to the
object in this technique is very small since the detection is performed through
sampling of single electrons in the object with very slow rate. We have applied
the met... | 1605.04685v1 |
2016-07-26 | Spin-orbit signatures in the dynamics of singlet-triplet qubits in double quantum dots | We characterize numerically and analytically the signatures of the spin-orbit
interaction in a two-electron GaAs double quantum dot in the presence of an
external magnetic field. In particular, we obtain the return probability of the
singlet state by simulating Landau-Zener voltage detuning sweeps which traverse
the si... | 1607.07852v3 |
2016-09-07 | Spin excitations in the quasi-two-dimensional charge-ordered insulator $α$-(BEDT-TTF)$_2$I$_3$ probed via $^{13}$C NMR | The spin excitations from the nonmagnetic charge-ordered insulating state of
$\alpha$-(BEDT-TTF)$_2$I$_3$ at ambient pressure have been investigated by
probing the static and low-frequency dynamic spin susceptibilities via
site-selective nuclear magnetic resonance at $^{13}$C sites. The site-dependent
values of the shi... | 1609.01906v1 |
2016-10-07 | Spin-orbit coupling controlled $J=3/2$ electronic ground state in 5$d^{3}$ oxides | Entanglement of spin and orbital degrees of freedom drives the formation of
novel quantum and topological physical states. Discovering new spin-orbit
entangled ground states and emergent phases of matter requires both
experimentally probing the relevant energy scales and applying suitable
theoretical models. Here we re... | 1610.02375v1 |
2017-07-02 | Dynamics of one-dimensional electrons with broken spin-charge separation | Spin-charge separation is known to be broken in many physically interesting
one-dimensional (1D) and quasi-1D systems with spin-orbit interaction because
of which spin and charge degrees of freedom are mixed in collective
excitations. Mixed spin-charge modes carry an electric charge and therefore can
be investigated by... | 1707.00316v3 |
2017-08-14 | Spin-resolved electronic structure of ferroelectric α-GeTe and multiferroic Ge1-xMnxTe | Germanium telluride features special spin-electric effects originating from
spin-orbit coupling and symmetry breaking by the ferroelectric lattice
polarization, which opens up many prospectives for electrically tunable and
switchable spin electronic devices. By Mn doping of the {\alpha}-GeTe host
lattice, the system be... | 1708.04104v1 |
2017-11-17 | Measuring anisotropic spin relaxation in graphene | We compare different methods to measure the anisotropy of the spin-lifetime
in graphene. In addition to out-of-plane rotation of the ferromagnetic
electrodes and oblique spin precession, we present a Hanle experiment where the
electron spins precess around either a magnetic field perpendicular to the
graphene plane or ... | 1711.06472v2 |
2017-12-01 | Coherent spin dynamics of ytterbium ions in yttrium orthosilicate | We investigate the electron and nuclear spin coherence properties of
ytterbium ($\mathrm{Yb}^{3+}$) ions with non-zero nuclear spin, within an
yttrium orthosilicate (Y$_2$SiO$_5$) crystal, with a view to their potential
application in quantum memories or repeaters. We find electron spin-lattice
relaxation times are max... | 1712.00435v1 |
2017-12-14 | Synthesis of antisymmetric spin exchange interaction and entanglement generation with chiral spin states in a superconducting circuit | We have synthesized the anti-symmetric spin exchange interaction (ASI), which
is also called the Dzyaloshinskii-Moriya interaction, in a superconducting
circuit containing five superconducting qubits connected to a bus resonator, by
periodically modulating the transition frequencies of the qubits with different
modulat... | 1712.05261v2 |
2017-12-25 | Coherent states in Magnetic Resonance | In NMR experiments, interaction of quantized radio-frequency (rf) field leads
to entanglement of nuclear spin with the electromagnetic field. In an entangled
state, the nuclear spins are depolarized with no net magnetization, which
cannot give a detectable signal in inductive detection. We show that when the
electromag... | 1712.09060v1 |
2018-01-03 | Negative spin-Hall angle and anisotropic spin-orbit torques in epitaxial IrMn | A spin-torque ferromagnetic resonance study is performed in epitaxial
$\mathrm{Fe / Ir_{15}Mn_{85}}$ bilayers with different Fe thicknesses. We
measure a negative spin-Hall angle of a few percent in the antiferromagnetic
IrMn in contrast to previously reported positive values. A large spin-orbit
field with Rashba symme... | 1801.01065v1 |
2018-05-14 | Electric field control of spins in molecular magnets | Coherent control of individual molecular spins in nano-devices is a pivotal
prerequisite for fulfilling the potential promised by molecular spintronics. By
applying electric field pulses during time-resolved electron spin resonance
measurements, we measure the sensitivity of the spin in several
antiferromagnetic molecu... | 1805.05256v2 |
2018-05-19 | Optically driven spin pumping mediating collective magnetization dynamics in a spin valve structure | We demonstrate spin pumping, i.e. the generation of a pure spin current by
precessing magnetization, without application of microwave radiation commonly
used in spin pumping experiments. We use femtosecond laser pulses to
simultaneously launch the magnetization precession in each of two ferromagnetic
layers of a Galfen... | 1805.07669v1 |
2017-05-10 | Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides | The interplay of Ising spin-orbit coupling and non-trivial band topology in
transition metal dichalcogenides (TMDs) produces anomalous transport and
optical properties that are very different from a regular 2D electron gas. The
spin-momentum locking of optically excited carriers near a valley point can
give rise to an ... | 1705.03909v2 |
2017-05-24 | Spin-singlet superconductivity in doped topological crystalline insulator Sn_{0.96}In_{0.04}Te | The In-doped topological crystalline insulator Sn_{1-x}In_xTe is a candidate
for a topological superconductor, where pseudo-spin-triplet state has been
proposed. To clarify the spin symmetry of Sn_{1-x}In_xTe, we perform
^{125}Te-nuclear magnetic resonance (NMR) measurements in polycrystalline
samples with 0< x <0.15. ... | 1705.08636v2 |
2017-05-30 | Fast optical control of spin in semiconductor interfacial structures | We report on a picosecond-fast optical removal of spin polarization from a
self-confined photo-carrier system at an undoped GaAs/AlGaAs interface
possessing superior long-range and high-speed spin transport properties. We
employed a modified resonant spin amplification technique with unequal
intensities of subsequent p... | 1705.10627v1 |
2018-02-08 | Coherent control of solid state nuclear spin nano-ensembles | Detecting and controlling nuclear spin nano-ensembles is crucial for the
further development of nuclear magnetic resonance (NMR) spectroscopy and for
the emerging solid state quantum technology. Here we present the fabrication of
a $\approx$ 1 nanometre thick diamond layer consisting of $^{13}$C nuclear
spins doped wit... | 1802.02921v1 |
2018-08-01 | Neutrino spin and spin-flavour oscillations in transversal matter currents with standard and non-standard interactions | After a brief history of two known types of neutrino mixing and oscillations,
including neutrino spin and spin-flavour oscillations in the transversal
magnetic field, we perform systematic study of a new phenomenon of neutrino
spin and spin-flavour oscillations engendered by the transversal matter
currents on the bases... | 1808.00302v2 |
2018-08-08 | Analog Quantum Simulation of Extremely Sub-Ohmic Spin-Boson Models | We propose a scheme for the quantum simulation of sub-Ohmic spin--boson
models by color centers in free-standing hexagonal boron nitride (h-BN)
membranes. The electronic spin of a color center that couples to the membrane
vibrational spectrum constitute the physical model. The spin-motion coupling is
provided by an ext... | 1808.02916v1 |
2019-02-10 | Spin asymmetry in single pion production induced by weak interactions of neutrinos with polarized nucleons | The single pion production (SPP) in the charged-current neutrino
(antineutrino) scattering off the polarized nucleon is discussed. The spin
asymmetry is predicted within two approaches. The spin polarizations of the
target nucleon that are longitudinal and perpendicular to the neutrino momentum
are considered. It is sh... | 1902.03671v2 |
2020-08-09 | Reduction of surface spin-induced electron spin relaxations in nanodiamonds | Nanodiamonds (NDs) hosting nitrogen-vacancy (NV) centers are promising for
applications of quantum sensing. Long spin relaxation times ($T_1$ and $T_2$)
are critical for high sensitivity in quantum applications. It has been shown
that fluctuations of magnetic fields due to surface spins strongly influences
$T_1$ and $T... | 2008.03832v1 |
2016-12-06 | Spin-Hall Torques Generated by Rare-Earth (Lanthanide) Thin Films | We report an initial experimental survey of spin-Hall torques generated by
the rare-earth metals Gd, Dy, Ho, and Lu, along with comparisons to
first-principles calculations of their spin Hall conductivities. Using spin
torque ferromagnetic resonance (ST-FMR) measurements and DC-biased ST-FMR, we
estimate lower bounds f... | 1612.01927v1 |
2016-12-21 | Spin transitions driven by electric dipole spin resonance in fluorinated single- and bilayer-graphene quantum dots | Spin transitions driven by a periodically varying electric potential in
dilute fluorinated graphene quantum dots are investigated. Flakes of monolayer
graphene are considered as well as electrostatic electron traps induced in
bilayer graphene. The stationary states are obtained within the tight-binding
approach and are... | 1612.07001v1 |
2017-02-17 | Spin-pumping through a varying-thickness MgO interlayer in Fe/Pt system | The spin-pumping mechanism is probed through a tunnelling MgO interlayer in
Fe/Pt bilayers. We show by ferromagnetic resonance technique and spin-pumping
experiments that spin currents can tunnel through the MgO interlayer for
thickness up to 2~{nm} and can produce significant voltages in the Pt layer.
The electrical d... | 1702.05298v1 |
2017-10-24 | Electrical spin driving by $g$-matrix modulation in spin-orbit qubits | In a semiconductor spin qubit with sizable spin-orbit coupling, coherent spin
rotations can be driven by a resonant gate-voltage modulation. Recently, we
have exploited this opportunity in the experimental demonstration of a hole
spin qubit in a silicon device. Here we investigate the underlying physical
mechanisms by ... | 1710.08690v2 |
2017-10-26 | Itinerant spin fluctuations in iron-based superconductors | Multiband systems, which possess a wide parameter space, allow to explore a
variety of competing ground states. Bright examples are the Fe-based pnictides
and chalcogenides, which demonstrate metallic, superconducting, and various
magnetic phases. Here I discuss only one of the many interesting topics,
namely, spin flu... | 1710.09888v1 |
2019-03-14 | Electrical control of spin mixing conductance in a Y$_3$Fe$_5$O$_{12}$/Platinum bilayer | We report a tunable spin mixing conductance, up to $\pm 22\%$, in a
Y${}_{3}$Fe${}_{5}$O${}_{12}$/Platinum (YIG/Pt) bilayer.This control is
achieved by applying a gate voltage with an ionic gate technique, which
exhibits a gate-dependent ferromagnetic resonance line width. Furthermore, we
observed a gate-dependent spin... | 1903.05865v1 |
2020-09-03 | Odd-spin glueballs, AdS/QCD and information entropy | Odd-spin glueballs in the dynamical AdS/QCD model are scrutinized, in the
paradigm of the configurational entropy (CE). Configurational-entropic Regge
trajectories, that relate the CE underlying odd-spin glueballs to their mass
spectra and spin, are then engendered. They predict the mass spectra of
odd-spin glueballs, ... | 2009.01890v2 |
2020-09-28 | Determination of spin-orbit torques by thickness-dependent spin-orbit torque FMR measurement | Current induced spin-orbit torques (SOTs) in Fe/Pt bilayers have been
investigated utilizing the spin-orbit torque ferromagnetic resonance (SOT-FMR)
measurement. Characterization of thin films with different thicknesses
indicates existence of a sizable field-like spin-orbit torque competing with
the Oersted field induc... | 2009.13162v2 |
2020-11-12 | Edge states in quantum spin chains: the interplay among interaction, gradient magnetic field and Floquet engineering | We explore the edge defects induced by spin-spin interaction in a finite
paradigmatic Heisenberg spin chain. By introducing a gradient magnetic field
and a periodically-modulated spin-exchange strength, the resonance between
modulation frequency and magnetic field gradient can also induce asymmetric
defects at the edge... | 2011.06164v4 |
2019-07-13 | Ab initio modelling of spin relaxation lengths in disordered graphene nanoribbons† | The spin-dependent transport properties of armchair graphene nanoribbons in
the presence of extrinsic spin-orbit coupling induced by a random distribution
of Nickel adatoms is studied. By combining a recursive Green's function
formalism with density functional theory, we explore the influence of ribbon
length and metal... | 1907.05979v1 |
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