Effective g-factors of carriers in inverted InAs/GaSb bilayers

Abstract

We perform tilt-field transport experiment on inverted InAs/GaSb which hosts quantum spin Hall insulator. By means of coincidence method, Landau level (LL) spectra of electron and hole carriers are systematically studied at different carrier densities tuned by gate voltages. When Fermi level stays in the conduction band, we observe LL crossing and anti-crossing behaviors at odd and even filling factors respectively, with a corresponding g-factor of 11.5. It remains nearly constant for varying filling factors and electron densities. On the contrary, for GaSb holes only a small Zeeman splitting is observed even at large tilt angles, indicating a g-factor of less than 3.

16 pages containing 4 figures

References in corpus (2)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges

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