Helical Quantum States in HgTe Quantum Dots with Inverted Band Structures

TL;DR

This paper theoretically explores the unique spin-polarized, ring-like edge states in HgTe quantum dots with inverted band structures, revealing their potential for detecting exotic quantum phenomena.

Contribution

It introduces the theoretical prediction of fully spin-polarized, ring-like edge states in HgTe quantum dots with inverted bands, highlighting their observable magnetic effects.

Findings

Spin-polarized quantum states in HgTe QDs with inverted bands.

Ring-like density distributions near QD boundaries.

Oscillating persistent currents and magnetic moments with magnetic field.

Abstract

We investigate theoretically the electron states in HgTe quantum dots (QDs) with inverted band structures. In sharp contrast to conventional semiconductor quantum dots, the quantum states in the gap of HgTe quantum dot with an inverted band structure are fully spin-polarized, and show ring-like density distributions near the boundary of the QD and spin-angular momentum locking. The persistent charge currents and magnetic moments, i.e., the Aharonov-Bohm effect, can be observed in such QD structure and oscillate with increasing magnetic fields. This feature offers us a practical way to detect these exotic ring-like edge states using the SQUID technique.