Chaotic Wannier-Bloch resonance states

Wannier-bloch Oscillators

We consider a Wannier-Stark problem for small eld f in the one-ladder case. We prove that a generical rst band state is a metastable state (Wannier-Bloch oscillator) with the lifetime determined by the imaginary part of the Wannier-Stark ladder. The innnite resonances of the ladder cause Bloch oscillations as a global beating eeect. For an adiabatic time = ft large enough, but much smaller than...

Bloch oscillations and Wannier Stark Ladder study in Semiconductor Superlattices

Président du jury : François JULIEN Directeur de Recherches(HDR), IEF – Univ. Paris Sud Rapporteurs : Olivier GAUTHIER-LAFAYE Chargé de Recherches(HDR), LAASUniv. Paul Sabatier Dominique COQUILLAT Directeur de Recherches(HDR), L2C –Univ. Montpellier 2 Examinateurs : Robson FERREIRA Directeur de Recherches(HDR), LPA – ENS de Paris Bloch oscillations and Wannier Stark Ladder study in Semiconducto...

Bloch oscillations and Wannier-Stark localization in semiconductor superlattices

Ever since the initial applications of quantum mechanics to the dynamics of electrons in solids, the analysis of Bloch electrons moving in a homogeneous electric field has been of central importance. By employing semiclassical arguments, in 1928 Bloch [1] demonstrated that, a wave packet given by a superposition of single-band states peaked about some quasimomentum, h̄k, moves with a group veloc...

Bloch oscillations, Zener tunneling, and Wannier-Stark ladders in the time domain.

Surface acoustic BLOCH oscillations, the Wannier-Stark ladder, and Landau-Zener tunneling in a solid.

We present the experimental observation of Bloch oscillations, the Wannier-Stark ladder, and Landau-Zener tunneling of surface acoustic waves in perturbed grating structures on a solid substrate. A model providing a quantitative description of our experimental observations, including multiple Landau-Zener transitions of the anticrossed surface acoustic Wannier-Stark states, is developed. The us...