Resonant carrier dynamics in strongly biassed superlattices

TL;DR

This paper investigates the coherent electron dynamics in biased superlattices, focusing on energy level anticrossings, Rabi oscillations, and resonant tunnelling, providing insights relevant for microwave generation and quantum control.

Contribution

It offers a detailed analysis of electron wavepacket behavior near energy anticrossings, linking Rabi and Zener resonances, and introduces an approach to study superlattice electron levels.

Findings

Dependence of wavepacket dynamics on electric field detuning

Identification of mixed regimes with Rabi oscillations and resonant tunnelling

Enhanced understanding of interminiband resonances

Abstract

We study coherent electron dynamics in a biassed undriven ideal semiconductor superlattice coupled to the continuum, near energy level anticrossings. In particular, we examine the dependence of wavepacket dynamical characteristics on electric field detuning, and investigate mixed regimes involving a superposition of energy level anticrossings showing both Rabi oscillations and resonant tunnelling. In earlier work [Phys. Rev. B 75 165421 (2007)], Rabi and Zener resonances were shown to have a common origin, and a criteria for the occurrence of either was proposed. The present results allow a better understanding of the nature of an interminiband resonance, which can be useful in the areas of microwave radiation generation and matter manipulation on the particle level, as well as demonstrate an alternative approach to examining electron level structure of a finite superlattice.