1,574 research outputs found
Giant Magnetoresistance Oscillations Induced by Microwave Radiation and a Zero-Resistance State in a 2D Electron System with a Moderate Mobility
The effect of a microwave field in the frequency range from 54 to 140
on the magnetotransport in a GaAs quantum well with AlAs/GaAs
superlattice barriers and with an electron mobility no higher than
is investigated. In the given two-dimensional system under
the effect of microwave radiation, giant resistance oscillations are observed
with their positions in magnetic field being determined by the ratio of the
radiation frequency to the cyclotron frequency. Earlier, such oscillations had
only been observed in GaAs/AlGaAs heterostructures with much higher mobilities.
When the samples under study are irradiated with a 140- microwave
field, the resistance corresponding to the main oscillation minimum, which
occurs near the cyclotron resonance, appears to be close to zero. The results
of the study suggest that a mobility value lower than
does not prevent the formation of zero-resistance states in magnetic field in a
two-dimensional system under the effect of microwave radiation.Comment: 4 pages, 2 figur
Nonequilibrium stationary states with ratchet effect
An ensemble of particles in thermal equilibrium at temperature , modeled
by Nos\`e-Hoover dynamics, moves on a triangular lattice of oriented semi-disk
elastic scatterers. Despite the scatterer asymmetry a directed transport is
clearly ruled out by the second law of thermodynamics. Introduction of a
polarized zero mean monochromatic field creates a directed stationary flow with
nontrivial dependence on temperature and field parameters. We give a
theoretical estimate of directed current induced by a microwave field in an
antidot superlattice in semiconductor heterostructures.Comment: 4 pages, 5 figures (small changes added
Directed electron transport through ballistic quantum dot under microwave radiation
Rectification of microwave radiation by asymmetric, ballistic quantum dot is
observed. The directed transport is studied at different frequency (1-40 GHz)
temperatures (0.3K-6K)and magnetic field. Dramatic reduction of the
rectification is found in magnetic fields at which the cyclotron (Larmor)
radius of the electron orbits at Fermi level is smaller than the size of the
quantum dot. It strongly suggests the ballistic nature of the observed
nonlinear phenomena. Both symmetric and anti-symmetric with respect to the
magnetic field contributions to the directed transport are presented. We have
found that the behavior of the symmetric part of the rectified voltage with the
magnetic field is different significantly for microwaves with different
frequencies. A ballistic model of the directed transport is proposed.Comment: 5 pages, 3 figure
Size effects in radiospectroscopy spectra of ferroelectric nanopowders
The theoretical and experimental investigation of ferroelectric nanopowders
is performed. The manifestation in radiospectroscopy spectra of size driven
ferroelectric-paraelectric phase transition at some critical particle average
size was the main goal of the consideration. In theoretical part the size
effect for the materials with ferroelectric tetragonal phase and cubic
paraelectric phase was considered allowing for the spontaneous polarization
inhomogeneity inside a particle and distribution of particle sizes. In ESR the
transformation of the spectra from tetragonal symmetry to cubic symmetry with
decreasing of nanoparticle sizes was calculated. Measurements of Fe3+ ESR
spectra in nanopowder of BaTiO3 were carried out at room temperature. The
decrease of intensity of tetragonal symmetry ESR lines of Fe3+ and appearance
of cubic symmetry line with asymmetry of the shoulders was observed with the
average sizes decrease with complete disappearance of tetragonal spectrum at
average size less or equal 40 nm. The comparison of the theory with experiment
was carried out. The value of critical size Rc = 40 nm was extracted from ESR
data. The asymmetry and broadening of right hand side shoulder of ESR cubic
symmetry line was shown to be related to contribution of paramagnetic centers
in the vicinity of the particles surface. The deconvolution of the cubic line
allowed to show, that this region size is about 3 nm.Comment: 10 pages, 8 figure
Visualizing quantum entanglement and the EPR paradox during the photodissociation of a diatomic molecule using two ultrashort laser pulses
We investigate theoretically the dissociative ionization of a H2+ molecule
using two ultrashort laser (pump-probe) pulses. The pump pulse prepares a
dissociating nuclear wave packet on an ungerade surface of H2+. Next, an UV (or
XUV) probe pulse ionizes this dissociating state at large (R = 20 - 100 bohr)
internuclear distance. We calculate the momenta distributions of protons and
photoelectrons which show a (two-slit-like) interference structure. A general,
simple interference formula is obtained which depends on the electron and
protons momenta, as well as on the pump-probe delay on the pulses durations and
polarizations. This interference can be interpreted as visualization of an
electron state delocalized over the two-centres. This state is an entangled
state of a hydrogen atom with a momentum p and a proton with an opposite
momentum. -p dissociating on the ungerade surface of H2+. This pump-probe
scheme can be used to reveal the nonlocality of the electron which intuitively
should be localized on just one of the protons separated by the distance R much
larger than the atomic Bohr orbit
Semiclassical theory of a quantum pump
In a quantum charge pump, the periodic variation of two parameters that
affect the phase of the electronic wavefunction causes the flow of a direct
current. The operating mechanism of a quantum pump is based on quantum
interference, the phases of interfering amplitudes being modulated by the
external parameters. In a ballistic quantum dot, there is a minimum time before
which quantum interference can not occur: the Ehrenfest time. Here we calculate
the current pumped through a ballistic quantum dot when the Ehrenfest time is
comparable to the mean dwell time. Remarkably, we find that the pumped current
has a component that is not suppressed if the Ehrenfest time is much larger
than the mean dwell time.Comment: 14 pages, 8 figures. Revised version, minor change
On surface plasmon polariton wavepacket dynamics in metal-dielectric heterostructures
The WKB equations for dynamics of the surface plasmon polariton (SPP)
wavepacket are studied. The dispersion law for the SPP in the metal-dielectric
heterostructure with varying thickness of a perforated dielectric layer is
rigorously calculated and investigated using the scattering matrix method. Two
channels of the SPP wavepacket optical losses related to the absorption in a
metal and to the SPP leakage are analyzed. It is shown that change of the
dielectric layer thickness acts on the SPP as an external force leading to
evolution of its quasimomentum and to the wavepacket reversal or even to the
optical Bloch oscillations (BO). Properties of these phenomena are investigated
and discussed. Typical values of the BO amplitude are about tens of microns and
the period is around tens or hundreds of femtoseconds.Comment: 12 pages, 5 figure
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