Helical Quantum States in HgTe Quantum Dots with Inverted Band Structures

Details Helical Quantum States in HgTe Quantum Dots with Inverted Band Structures Helical Quantum States in HgTe Quantum Dots with Inverted Band Structures

2010-10-20

arxiv.org/abs/1010.4153v2

Phys. Rev. Lett. 106, 206802 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.106.206802

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.

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