7,743 research outputs found
Measurements of the effect of horizontal variability of atmospheric backscatter on dial measurements
The horizontal variability of atmospheric backscatter may have a substantial effect on how Differential Absorption Lidar (DIAL) data must be taken and analyzed. To minimize errors, lidar pulse pairs are taken with time separations which are short compared to the time scales associated with variations in atmospheric backscatter. To assess the atmospheric variability for time scales which are long compared to the lidar pulse repetition rate, the variance of the lidar return signal in a given channel can be computed. The variances of the on-line, off-line, and ration of the on-line to off-line signals at given altitudes obtained with the dual solid-state Alexandrite laser system were calculated. These evaluations were made for both down-looking aircraft and up-looking ground-based lidar data. Data were taken with 200 microsecond separation between on-line and off-line laser pulses, 30 m altitude resolution, 5 Hz repetition rate, and the signal were normalized for outgoing laser energy
Mott physics, sign structure, ground state wavefunction, and high-Tc superconductivity
In this article I give a pedagogical illustration of why the essential
problem of high-Tc superconductivity in the cuprates is about how an
antiferromagnetically ordered state can be turned into a short-range state by
doping. I will start with half-filling where the antiferromagnetic ground state
is accurately described by the Liang-Doucot-Anderson (LDA) wavefunction. Here
the effect of the Fermi statistics becomes completely irrelevant due to the no
double occupancy constraint. Upon doping, the statistical signs reemerge,
albeit much reduced as compared to the original Fermi statistical signs. By
precisely incorporating this altered statistical sign structure at finite
doping, the LDA ground state can be recast into a short-range antiferromagnetic
state. Superconducting phase coherence arises after the spin correlations
become short-ranged, and the superconducting phase transition is controlled by
spin excitations. I will stress that the pseudogap phenomenon naturally emerges
as a crossover between the antiferromagnetic and superconducting phases. As a
characteristic of non Fermi liquid, the mutual statistical interaction between
the spin and charge degrees of freedom will reach a maximum in a
high-temperature "strange metal phase" of the doped Mott insulator.Comment: 12 pages, 12 figure
-valley electron factor in bulk GaAs and AlAs
We study the Land\'e -factor of conduction electrons in the -valley of
bulk GaAs and AlAs by using a three-band model
together with the tight-binding model. We find that the -valley -factor
is highly anisotropic, and can be characterized by two components,
and . is close to the free electron Land\'e factor but
is strongly affected by the remote bands. The contribution from remote
bands on depends on how the remote bands are treated. However, when
the magnetic field is in the Voigt configuration, which is widely used in the
experiments, different models give almost identical -factor.Comment: 4 pages, 1 figure, To be published in J. App. Phys. 104, 200
Mean-Field Description of Phase String Effect in the Model
A mean-field treatment of the phase string effect in the model is
presented. Such a theory is able to unite the antiferromagnetic (AF) phase at
half-filling and metallic phase at finite doping within a single theoretical
framework. We find that the low-temperature occurrence of the AF long range
ordering (AFLRO) at half-filling and superconducting condensation in metallic
phase are all due to Bose condensations of spinons and holons, respectively, on
the top of a spin background described by bosonic resonating-valence-bond (RVB)
pairing. The fact that both spinon and holon here are bosonic objects, as the
result of the phase string effect, represents a crucial difference from the
conventional slave-boson and slave-fermion approaches. This theory also allows
an underdoped metallic regime where the Bose condensation of spinons can still
exist. Even though the AFLRO is gone here, such a regime corresponds to a
microscopic charge inhomogeneity with short-ranged spin ordering. We discuss
some characteristic experimental consequences for those different metallic
regimes. A perspective on broader issues based on the phase string theory is
also discussed.Comment: 18 pages, five figure
Magnetic Incommensurability in Doped Mott Insulator
In this paper we explore the incommensurate spatial modulation of spin-spin
correlations as the intrinsic property of the doped Mott insulator, described
by the model. We show that such an incommensurability is a direct
manifestation of the phase string effect introduced by doped holes in both one-
and two-dimensional cases. The magnetic incommensurate peaks of dynamic spin
susceptibility in momentum space are in agreement with the neutron-scattering
measurement of cuprate superconductors in both position and doping dependence.
In particular, this incommensurate structure can naturally reconcile the
neutron-scattering and NMR experiments of cuprates.Comment: 12 pages (RevTex), five postscript figure
Strain tuned magnetotransport of Jeff=1/2 antiferromagnetic Sr2IrO4 thin films
In this work, we report observation of strain effect on physical properties
of Sr2IrO4 thin films grown on SrTiO3 (001) and LaAlO3 (001) substrates. It is
found that the film on LaAlO3 with compressive strain has a lower
antiferromagnetic transition temperature (TN~210 K) than the film on SrTiO3
(TN~230 K) with tensile strain, which is probably caused by modified interlayer
coupling. Interestingly, magnetoresistance due to pseudospin-flip of the film
on LaAlO3 is much larger than that of tensile-strained film on SrTiO3, and
robust anisotropic magnetoresistance is observed in the former, but H-driven
reversal behavior is seen in the latter. By performing first principles
calculations, it is revealed that epitaxial strain plays an efficient role in
tuning the canting angle of Jeff=1/2 moments and thus net moment at every IrO2
layer, responsible for the difference in magnetoresistance between the films.
The reversal of anisotropic magnetoresistance in the thin film on SrTiO3 can be
ascribed to stabilization of a metastable stable with smaller bandgap as the
Jeff=1/2 moments are aligned along the diagonal of basal plane by H. However,
theoretical calculations reveal much higher magnetocrystalline anisotropy
energy in the film on LaAlO3. This causes difficulties to drive the Jeff=1/2
moments to reach the diagonal and thereby the metastable state, explaining the
distinct anisotropic magnetoresistance between two samples in a qualitative
sense. Our findings indicate that strain can be a highly efficient mean to
engineer the functionalities of Jeff=1/2 antiferromagnet Sr2IrO4.Comment: 21 pages and 5 figure
Bosonic t-J Model in a stacked triangular lattice and its phase diagram
In this paper, we study phase diagram of a system of two-component hard-core
bosons with nearest-neighbor (NN) pseudo-spin antiferromagnetic (AF)
interactions in a stacked triangular lattice. Hamiltonian of the system
contains three parameters one of which is the hopping amplitude between NN
sites, and the other two are the NN pseudo-spin exchange interaction and
the one that measures anisotropy of pseudo-spin interactions. We investigate
the system by means of the Monte-Carlo simulations and clarify the
low-temperature phase diagram. In particular, we are interested in how the
competing orders, i.e., AF order and superfluidity, are realized, and also
whether supersolid forms as a result of hole doping into the state of the
pseudo-spin pattern with the structure.Comment: 18 pages, 17 figures, Version to appear in J.Phys.Soc.Jp
Disappearance of integer quantum Hall effect
The disappearance of integer quantum Hall effect (IQHE) at strong disorder
and weak magnetic field is studied in a lattice model. A generic sequence by
which the IQHE plateaus disappear is revealed: higher IQHE plateaus always
vanish earlier than lower ones, and extended levels between those plateaus do
not float up in energy but keep merging together after the destruction of
plateaus. All of these features remain to be true in the weak-field limit as
shown by the thermodynamic-localization-length calculation. Topological
characterization in terms of Chern integers provides a simple physical
explanation and suggests a qualitative difference between the lattice and
continuum models.Comment: Revtex, four pages; four figures, postscript fil
- …