Related Experiment Video
Updated: May 28, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Evidence for helical edge modes in inverted InAs/GaSb quantum wells
Ivan Knez1, Rui-Rui Du, Gerard Sullivan
1Department of Physics and Astronomy, Rice University, Houston, Texas 77251-1892, USA.
Abstract:
We present an experimental study of low temperature electronic transport in the hybridization gap of inverted InAs/GaSb composite quantum wells. An electrostatic gate is used to push the Fermi level into the gap regime, where the conductance as a function of sample length and width is measured. Our analysis shows strong evidence for the existence of helical edge modes proposed by Liu et al [Phys. Rev. Lett. 100, 236601 (2008)]. Edge modes persist in spite of sizable bulk conduction and show only a weak magnetic field dependence-a direct consequence of a gap opening away from the zone center.
Related Concept Videos
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Atomic Nuclei: Nuclear Spin State Overview
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

