Spectral properties and magneto-optical excitations in semiconductor double-rings under Rashba spin-orbit interaction

TL;DR

This paper numerically analyzes the spectral and magneto-optical properties of semiconductor double rings with Rashba spin-orbit interaction, revealing complex energy spectra and quantum state manipulation possibilities.

Contribution

It introduces a numerical approach to study electron dynamics in double rings with Rashba interaction, highlighting control mechanisms for quantum state transitions.

Findings

Multi-zigzag periodic energy spectrum due to Aharonov-Bohm effect

Demonstration of quantum state manipulation via Rabi oscillations

Complete electron transfer using chirped pulses and Landau-Zener dynamics

Abstract

We have numerically solved the Hamiltonian of an electron in a semiconductor double ring subjected to the magnetic flux and Rashba spin-orbit interaction. It is found that the Aharonov-Bohm energy spectrum reveals multi-zigzag periodic structures. The investigations of spin-dependent electron dynamics via Rabi oscillations in two-level and three-level systems demonstrate the possibility of manipulating quantum states. Our results show that the optimal control of photon-assisted inter-ring transitions can be achieved by employing cascade-type and $\Lambda$-type transition mechanisms. Under chirped pulse impulsions, a robust and complete transfer of an electron to the final state is shown to coincide with the estimation of the Landau-Zener formula.