Probing the semiconductor to semimetal transition in InAs/GaSb double quantum wells by magneto-infrared spectroscopy

Abstract

We perform a magneto-infrared spectroscopy study of the semiconductor to semimetal transition of InAs/GaSb double quantum wells from the normal to the inverted state. We show that owing to the low carrier density of our samples (approaching the intrinsic limit), the magneto-absorption spectra evolve from a single cyclotron resonance peak in the normal state to multiple absorption peaks in the inverted state with distinct magnetic field dependence. Using an eight-band Pidgeon-Brown model, we explain all the major absorption peaks observed in our experiment. We demonstrate that the semiconductor to semimetal transition can be realized by manipulating the quantum confinement, the strain, and the magnetic field. Our work paves the way for band engineering of optimal InAs/GaSb structures for realizing novel topological states as well as for device applications in the terahertz regime.

15 pages, 9 figures

References in corpus (4)

• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Electronic States and Cyclotron Resonance in n-type InMnAs
• Spin states in InAs/AlSb/GaSb semiconductor quantum wells
• Anomalous Rashba spin-orbit interaction in InAs/GaSb quantum wells

Cited by in corpus (8)

• Giant $g$-factors and fully spin-polarized states in metamorphic short-period InAsSb/InSb superlattices
• Revealing temperature evolution of the Dirac band in ZrTe${}_5$ via magneto-infrared spectroscopy
• $g$-factor engineering with InAsSb alloys toward zero band gap limit
• Impact of epitaxial strain on the topological-nontopological phase diagram and semimetallic behavior of InAs/GaSb composite quantum wells
• Landau quantization in tilted Weyl semimetals with broken symmetry
• Magneto-optical evidence of tilting effect in coupled Weyl bands
• Antiparticle of exciton in semimetals
• Evidence for an excitonic insulator phase in a zero-gap InAs/GaSb bilayer