Topological surface states of strained Mercury-Telluride probed by ARPES

TL;DR

This paper reports high-resolution ARPES measurements revealing the Dirac cone surface states in strained HgTe, showing their dispersion, origin, and circular dichroism characteristics, advancing understanding of topological insulators.

Contribution

It provides detailed experimental characterization of the topological surface states in strained HgTe using ARPES, highlighting their dispersion and dichroism properties.

Findings

Dirac cone surface states observed in strained HgTe

Surface states originate near the top of the ext{GH} band

Circular dichroism measured for all bands

Abstract

The topological surface states of strained HgTe have been measured using high-resolution ARPES measurements. The dispersion of surface states form a Dirac cone, which origin is close to the top of the \ghh band: the top half of the Dirac cone is inside the stress-gap while the bottom half lies within the heavy hole bands and keeps a linear dispersion all the way to the X-point. The circular dichroism of the photo-emitted electron intensity has also been measured for all the bands.