The chaotic behavior of high-field transport in weakly-coupled narrow-miniband GaAs/AlAs superlattices (SL) under ac + dc biases has been numerically studied within a self-consistent discrete model. It is shown that the regions of entrainment and quasiperiodicity form the Arnol'd tongues on the driv
Localization of electronic states in semiconductor superlattices
β Scribed by M. Waki; K. Watari
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 211 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0749-6036
No coin nor oath required. For personal study only.
β¦ Synopsis
In this work we have studied systematically the effect of fluctuations in thickness and depth of the well, as well as in the thickness of the barrier in semiconductor superlattices. Our results show that the main effect of fluctuations is to break down the whole superlattice into subsets. Localization occurs when there are no degenerate states among the subsets, regardless of symmetry considerations.
π SIMILAR VOLUMES
Lateral superstructures with honeycomb or square symmetries, as a model for the two-dimensional \(\pi\) electron sea in organic crystals or atomistic quantum dot arrays, are shown to be classified, with a simple criterion, into semimetals with gapless \(k\)-linear dispersions, semiconductors and met
We discuss some of the basic theoretical aspects of current-carrying states in superconducting superlattices with tunnel barriers in the mesoscopic regime, when p -1 0 a ΞΎ 0 (a is the superconducting layer thickness, p 0 is the Fermi momentum, ΞΎ 0 is the BCS coherence length and = 1). We establish t
We investigate the dephasing dynamics in semiconductor superlattices using timeresolved four-wave mixing. The signals show a periodic modulation which can be related to Bloch oscillations in the superlattice miniband. The oscillation frequency is strongly dependent on the applied field, in agreement