1,051 research outputs found
Symmetry reduction in multiband Hamiltonians for semiconductor quantum dots: The role of interfaces and higher energy bands
The role of interfaces and higher bands on the electronic structure of embedded semiconductor
quantum dots (QDs) was investigated. The term in the multiband k�p Hamiltonian that captures the
effect of interface band mixing was derived starting from the microscopic theory. It was shown,
analytically and numerically, that, with such a term included, the right symmetry of the QD system
can be captured. It leads to splitting of otherwise degenerate energy levels of the order of several
meV. The inclusion of additional higher bands beyond the ones from the standard eight-band model
also leads to the reduction of symmetry from an artificially high one to the true atomistic symmetry
of the system, however their quantitative effect is weaker. These results prove that the multiband
k.p Hamiltonians are fully capable of describing the correct symmetry of a QD
On the interdiffusion-based quantum cascade laser
Design procedure for the active region of current
pumped quantum cascade laser is proposed, so to achieve maximal gain. Starting with an arbitrary smooth potential, a family of isospectral Hamiltonians with predefined energy spectrum is generated using the inverse spectral theory. By varying the relevant control parameter the potential shape is varied, inducing changes
in transition dipole moments and electron–phonon scattering
times, and the optimal potential which gives the largest gain is thus found. For purpose of realization, a simple step quantum-well structure with just a few layers is then designed so that in the post-growth heating-induced layer interdiffusion, it will acquire a shape as close as possible to the optimal smooth potentia
On inhibiting Auger intraband relaxation in InAs/GaAs quantum dot intermediate band solar cells
Electronic structure of III-V’s semiconductors from B3LYP and PBE0 functionals
Published versio
Yugoslavic Agricultural Development Policy: A Comparative Historical Analysis of Aggregate, Social Farm, and Private Farm Productivity
Exact date of working paper unknown.This paper examines the effects of this policy shift on Yugoslavic agricultural Development. During 1955-67 Yugoslavia invested heavily in human capital and physical capital in the social farming sector. However, during 1968-83, a shift in policy brought about a decline in the level of physical investment on the social farms leaving the human capital with little to work with
Coexistence of Superconductivity and Spin Density Wave orderings in the organic superconductor (TMTSF)_2PF_6
The phase diagram of the organic superconductor (TMTSF)_2PF_6 has been
revisited using transport measurements with an improved control of the applied
pressure. We have found a 0.8 kbar wide pressure domain below the critical
point (9.43 kbar, 1.2 K) for the stabilisation of the superconducting ground
state featuring a coexistence regime between spin density wave (SDW) and
superconductivity (SC). The inhomogeneous character of the said pressure domain
is supported by the analysis of the resistivity between T_SDW and T_SC and the
superconducting critical current. The onset temperature T_SC is practically
constant (1.20+-0.01 K) in this region where only the SC/SDW domain proportion
below T_SC is increasing under pressure. An homogeneous superconducting state
is recovered above the critical pressure with T_SC falling at increasing
pressure. We propose a model comparing the free energy of a phase exhibiting a
segregation between SDW and SC domains and the free energy of homogeneous
phases which explains fairly well our experimental findings.Comment: 13 pages, 10 figures, revised v: fig.9 added, section 4.2 rewritten,
accepted v: sections 4&5 improve
Variability and Correlations of Some Investigated Traits of Perennial Ryegrass Populations
Perennial ryegrass (Lolium perenne) is one of the most important perennial forage grasses for temperate climates. It is a highly productive grass with the highest nutritive value (Sokolovi et al., 2002). In Serbia, breeders have developed perennial ryegrass cultivars with high stabile yield and quality with different times of maturity and resistance to drought and frost. The initial breeding material were usually wild populations (Charmet et. al., 1996) with high variability and adaptability. These characteristics lend themselves for selection of superior genotypes. But breeding for some important agronomic traits may influence others. This relationship between traits and breeding population variability is the objective of this article
Influence of Quantum Hall Effect on Linear and Nonlinear Conductivity in the FISDW States of the Organic Conductor (TMTSF)_2PF_6
We report a detailed characterization of quantum Hall effect (QHE) influence
on the linear and non-linear resistivity tensor in FISDW phases of the organic
conductor (TMTSF)2PF6. We show that the behavior at low electric fields,
observed for nominally pure single crystals with different values of the
resistivity ratio, is fully consistent with a theoretical model, which takes
QHE nature of FISDW and residual quasi-particle density associated with
different crystal imperfection levels into account. The non-linearity in
longitudinal and diagonal resistivity tensor components observed at large
electric fields reconciles preceding contradictory results. Our theoretical
model offers a qualitatively good explanation of the observed features if a
sliding of the density wave with the concomitant destruction of QHE, switched
on above a finite electric field, is taken into account.Comment: 8 pages, 6 figures, submitted to EPJ
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