1,188 research outputs found
Spin Hall effect due to intersubband-induced spin-orbit interaction in symmetric quantum wells
We investigate the intrinsic spin Hall effect in two-dimensional electron
gases in quantum wells with two subbands, where a new intersubband-induced
spin-orbit coupling is operative. The bulk spin Hall conductivity
is calculated in the ballistic limit within the standard Kubo
formalism in the presence of a magnetic field and is found to remain finite
in the B=0 limit, as long as only the lowest subband is occupied. Our
calculated exhibits a nonmonotonic behavior and can change its
sign as the Fermi energy (the carrier areal density ) is varied between
the subband edges. We determine the magnitude of for realistic
InSb quantum wells by performing a self-consistent calculation of the
intersubband-induced spin-orbit coupling.Comment: 7 pages, 3 figure
Persistent Skyrmion Lattice of Noninteracting Electrons with Spin-Orbit Coupling
A persistent spin helix (PSH) is a robust helical spin-density pattern
arising in disordered 2D electron gases with Rashba and Dresselhaus
spin-orbit (SO) tuned couplings, i.e., . Here we
investigate the emergence of a Persistent Skyrmion Lattice (PSL) resulting from
the coherent superposition of PSHs along orthogonal directions -- crossed PSHs
-- in wells with two occupied subbands . For realistic GaAs wells we
show that the Rashba and Dresselhaus couplings can be
simultaneously tuned to equal strengths but opposite signs, e.g., and . In this regime and away from band
anticrossings, our {\it non-interacting} electron gas sustains a topologically
non-trivial skyrmion-lattice spin-density excitation, which inherits the
robustness against spin-independent disorder and interactions from its
underlying crossed PSHs. We find that the spin relaxation rate due to the
interband SO coupling is comparable to that of the cubic Dresselhaus term as a
mechanism of the PSL decay. Near anticrossings, the interband-induced spin
mixing leads to unusual spin textures along the energy contours beyond those of
the Rahsba-Dresselhaus bands. Our PSL opens up the unique possibility of
observing topological phenomena, e.g., topological and skyrmion Hall effects,
in ordinary GaAs wells with non-interacting electrons.Comment: 5 pages, 2 figures; changed the presentation and added supplemental
material (17 pages, 1 figure
On the Steady Nature of Line-Driven Disk Winds: Application to Cataclysmic Variables
We apply the semi-analytical analysis of the steady nature of line-driven
winds presented in two earlier papers to disk winds driven by the flux
distribution of a standard Shakura & Sunyaev (1973) disk for typical
cataclysmic variable (CV) parameters. We find that the wind critical point
tends to be closer to the disk surface towards the inner disk regions. Our main
conclusion, however, is that a line-driven wind, arising from a steady disk
flux distribution of a standard Shakura-Sunyaev disk capable of locally
supplying the corresponding mass flow, is steady. These results confirm the
findings of an earlier paper that studied "simple" flux distributions that are
more readily analyzable than those presented here. These results are consistent
with the steady velocity nature of outflows observationally inferred for both
CVs and quasi-stellar objects (QSOs). We find good agreement with the 2.5D CV
disk wind models of Pereyra and collaborators. These results suggest that the
likely scenario to account for the wind outflows commonly observed in CVs is
the line-driven accretion disk wind scenario, as suggested early-on by Cordova
& Mason (1982). For QSOs, these results show that the line-driven accretion
disk wind continues to be a promising scenario to account for the outflows
detected in broad absorption line (BAL) QSOs, as suggested early-on by Turnshek
(1984), and analyzed in detail by Murray et al. (1995).Comment: 35 pages, 20 figure
APRIL: Active Preference-learning based Reinforcement Learning
This paper focuses on reinforcement learning (RL) with limited prior
knowledge. In the domain of swarm robotics for instance, the expert can hardly
design a reward function or demonstrate the target behavior, forbidding the use
of both standard RL and inverse reinforcement learning. Although with a limited
expertise, the human expert is still often able to emit preferences and rank
the agent demonstrations. Earlier work has presented an iterative
preference-based RL framework: expert preferences are exploited to learn an
approximate policy return, thus enabling the agent to achieve direct policy
search. Iteratively, the agent selects a new candidate policy and demonstrates
it; the expert ranks the new demonstration comparatively to the previous best
one; the expert's ranking feedback enables the agent to refine the approximate
policy return, and the process is iterated. In this paper, preference-based
reinforcement learning is combined with active ranking in order to decrease the
number of ranking queries to the expert needed to yield a satisfactory policy.
Experiments on the mountain car and the cancer treatment testbeds witness that
a couple of dozen rankings enable to learn a competent policy
Restriction fragment mass polymorphism (RFMP) analysis based on MALDI-TOF mass spectrometry for detecting antiretroviral resistance in HIV-1 infected patients
AbstractViral genotype assessment is important for effective clinical management of HIV-1 infected patients, especially when access and/or adherence to antiretroviral treatment is reduced. In this study, we describe development of a matrix-assisted laser desorption/ionization-time of flight mass spectrometry-based viral genotyping assay, termed restriction fragment mass polymorphism (RFMP). This assay is suitable for sensitive, specific and high-throughput detection of multiple drug-resistant HIV-1 variants. One hundred serum samples from 60 HIV-1-infected patients previously exposed to nucleoside reverse transcriptase inhibitors (NRTIs), non-nucleoside reverse transcriptase inhibitors (NNRTIs) and protease inhibitors (PIs) were analysed for the presence of drug-resistant viruses using the RFMP and direct sequencing assays. Probit analysis predicted a detection limit of 223.02 copies/mL for the RFMP assay and 1268.11 copies/mL for the direct sequencing assays using HIV-1 RNA Positive Quality Control Series. The concordance rates between the RFMP and direct sequencing assays for the examined codons were 97% (K65R), 97% (T69Ins/D), 97% (L74VI), 97% (K103N), 96% (V106AM), 97% (Q151M), 97% (Y181C), 97% (M184VI) and 94% (T215YF) in the reverse transcriptase coding region, and 100% (D30N), 100% (M46I), 100% (G48V), 100% (I50V), 100% (I54LS), 99% (V82A), 99% (I84V) and 100% (L90M) in the protease coding region. Defined mixtures were consistently and accurately identified by RFMP at 5% relative concentration of mutant to wild-type virus while at 20% or greater by direct sequencing. The RFMP assay based on mass spectrometry proved to be sensitive, accurate and reliable for monitoring the emergence and early detection of HIV-1 genotypic variants that lead to drug resistance
Study of electron anti-neutrinos associated with gamma-ray bursts using KamLAND
We search for electron anti-neutrinos () from long and
short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector
from August 2002 to June 2013. No statistically significant excess over the
background level is found. We place the tightest upper limits on
fluence from GRBs below 7 MeV and place first constraints on
the relation between luminosity and effective temperature.Comment: 16 pages and 5 figure
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