Omnidirectional light propagation in a realistic superlattice is investigated. This work complements two previous articles [Phys. Rev. E 59, 3624 (1999); 61, 5802 (2000)] that analyzed the cases of transverse electric (TE) and transverse magnetic (TM) polarization modes, respectively, of the dielectric superlattice modeled by means of Dirac delta functions. We present a quantitative analysis of...

Citation Shu, G. J. et al. " Oxygen nonstoichiometry and the origin of Na ion ordering in P2-Na_{x}CoO_{2}. " Physical Review B 82.5 (2010): 054106. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access ...

With recent advances in epitaxial crystal-growth techniques, it has become possible to grow the semiconductor superlattice systems composed of alternate layers of two different semiconductor materials. This leads the band edges to exhibit a periodic variation with the position along the direction of crystal growth, The most extensively studied superlattice is the one consisting of alternate lay...

SiGe is a good thermoelectric material for high temperature applications. In this paper the fabrication and characterization of single-element SiGe/Si superlattice coolers of both nand p-type devices are described for room temperature applications. Superlattice structures were used to enhance the device performance by reducing the thermal conductivity between the hot and the cold junctions, and...

A recent Faraday wave experiment with two-frequency forcing reports two types of 'superlattice' patterns that display periodic spatial structures having two separate scales [1]. These patterns both arise as secondary states once the primary hexagonal pattern becomes unstable. In one of these patterns (so-called 'superlattice-two') the original hexagonal symmetry is broken in a subharmonic insta...

We investigate electron transmission coefficients through quantum wells and quantum superlattices on topological insulator surfaces. The quantum well or superlattice is not constituted by general electronic potential barriers but by Fermi velocity barriers which originate in the different topological insulator surfaces. It is found that electron resonant modes can be renormalized by quantum wel...

A model has been established for the effective thermal conductivity of a bulk polycrystal made of randomly oriented superlattice grains with anisotropic thermal conductivity. The in-plane and cross-plane thermal conductivities of each superlattice grain are combined using an analytical averaging rule that is verified using finite element methods. The superlattice conductivities are calculated u...

The study of the radiation hardness subterahertz source from a Gunn diode oscillator and multiplier, based on semiconductor superlattice GaAs/AlAs was continued. dependences output power frequency before after neutron irradiation are experimentally measured. dependence to with fluences 3.5·10 12 , 2.85·10 13 10 14 cm -2 has been analytically estimated. Keywords: Radiation hardness, superlattice...