Quantum nanostructures in strongly spin-orbit coupled two-dimensional systems

TL;DR

This paper explores how strong spin-orbit coupling significantly alters the energy spectra of electrons in low-dimensional semiconductor nanostructures, revealing new phenomena like soft modes and spin protection.

Contribution

It demonstrates the profound effects of strong spin-orbit coupling on energy spectra in quantum dots and wires, highlighting phenomena not previously detailed.

Findings

Development of a soft mode in circular quantum dots

Spin protection in elongated quantum dots

Nearly flat energy spectrum in quantum wires

Abstract

Recent progress in experimental studies of low-dimensional systems with strong spin-orbit coupling poses a question on the effect of this coupling on the energy spectrum of electrons in semiconductor nanostructures. It is shown in the paper that this effect is profound in the strong coupling limit. In circular quantum dots a soft mode develops, in strongly elongated dots electron spin becomes protected from the effects of the environment, and the lower branch of the energy spectrum of quantum wires becomes nearly flat in a wide region of the momentum space.