1,382,282 research outputs found
Nonlinear dynamics of polariton scattering in semiconductor microcavity: bistability vs stimulated scattering
We demonstrate experimentally an unusual behavior of the parametric polariton
scattering in semiconductor microcavity under a strong cw resonant excitation.
The maximum of the scattered signal above the threshold of stimulated
parametric scattering does not shift along the microcavity lower polariton
branch with the change of pump detuning or angle of incidence but is stuck
around the normal direction. We show theoretically that such a behavior can be
modelled numerically by a system of Maxwell and nonlinear Schroedinger
equations for cavity polaritons and explained via the competition between the
bistability of a driven nonlinear MC polariton and the instabilities of
parametric polariton-polariton scattering.Comment: 5 pages, 4 Postscript figures; corrected typo
Alpha-decay lifetimes semiempirical relationship including shell effects
A new version of the semiempirical formula based on fission approach of alpha
decay is derived, by using the optimum values of the fitting parameters
determined for even-even nuclei, combined with hindrance factors for even-odd,
odd-even, and odd-odd nuclides. The deviations from experimental data for two
regions of nuclear chart (493 alpha emitters with Z=52-118 and 142 transuranium
nuclei including superheavies (Z=92-118), respectively) are compared with those
obtained by using the universal curve and the Viola-Seaborg semiempirical
relationship.Comment: 11 pages, 3 figures, revtex
Efficient fiber coupling of down-conversion photon pairs
We develop and apply an effective analytic theory of a non-collinear,
broadband type-I parametric down-conversion to study a coupling efficiency of
the generated photon pairs into single mode optical fibers. We derive
conditions necessary for highly efficient coupling for single and double type-I
crystal producing polarization entangled states of light. We compare the
obtained approximate analytic expressions with the exact numerical solutions
and discuss the results for a case of BBO crystals.Comment: 15 pages, 4 figure
Transition Radiation by Standard Model Neutrinos at an Interface
We discuss the transition radiation process at an
interface of two media. The medium fulfills the dual purpose of inducing an
effective neutrino-photon vertex and of modifying the photon dispersion
relation. The transition radiation occurs when at least one of those quantities
have different values in different media. We present a result for the
probability of the transition radiation which is both accurate and analytic.
For MeV neutrino crossing polyethylene-vacuum interface the
transition radiation probability is about and the energy intensity
(deposition) is about eV. At the surface of the neutron stars the
transition radiation probability may be . Our result on three
orders of magnitude is larger than the results of previous calculations.}Comment: invited talk, to appear in the proceedings of the XLVIth Rencontres
de Moriond EW 201
BCS approximation to the effective vector vertex of superfluid fermions
We examine the effective interaction of nonrelativistic fermions with an
external vector field in superfluid systems. In contrast to the complicated
vertex equation, usually used in this case, we apply the approach which does
not employ an explicit form of the pairing interaction. This allows to obtain a
simple analytic expression for the vertex function only in terms of the order
parameter and other macroscopic parameters of the system. We use this effective
vertex to analyze the linear response function of the superfluid medium at
finite temperatures. At the time-like momentum transfer, the imaginary part of
the response function is found to be proportional to the fourth power of small
Fermi velocity, i.e. the energy losses through vector currents are strongly
suppressed. As an application, we calculate the neutrino energy losses through
neutral weak currents caused by the pair recombination in the superfluid
neutron matter at temperatures lower than the critical one for S-wave pairing.
This approach confirms a strong suppression of the neutrino energy losses as
predicted in Ref.[4].Comment: 19 pages, no figure
Magnetic exchange interaction between rare-earth and Mn ions in multiferroic hexagonal manganites
We report a study of magnetic dynamics in multiferroic hexagonal manganite
HoMnO3 by far-infrared spectroscopy. Low-temperature magnetic excitation
spectrum of HoMnO3 consists of magnetic-dipole transitions of Ho ions within
the crystal-field split J=8 manifold and of the triangular antiferromagnetic
resonance of Mn ions. We determine the effective spin Hamiltonian for the Ho
ion ground state. The magnetic-field splitting of the Mn antiferromagnetic
resonance allows us to measure the magnetic exchange coupling between the
rare-earth and Mn ions.Comment: accepted for publication in Physical Review Letter
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