Evidence for a topological excitonic insulator in InAs/GaSb bilayers
Abstract
Electron–hole pairing can occur in a dilute semimetal, transforming the system into an excitonic insulator state in which a gap spontaneously appears at the Fermi surface, analogous to a Bardeen–Cooper–Schrieffer (BCS) superconductor. Here, we report optical spectroscopic and electronic transport evidence for the formation of an excitonic insulator gap in an inverted InAs/GaSb quantum-well system at low temperatures and low electron–hole densities. Terahertz transmission spectra exhibit two absorption lines that are quantitatively consistent with predictions from the pair-breaking excitation dispersion calculated based on the BCS gap equation. Low-temperature electronic transport measurements reveal a gap of ~2 meV (or ~25 K) with a critical temperature of ~10 K in the bulk, together with quantized edge conductance, suggesting the occurrence of a topological excitonic insulator phase.
- Authors:
-
- Rice Univ., Houston, TX (United States)
- Chinese Academy of Sciences (CAS), Beijing (China)
- Teledyne Scientific and Imaging, Thousand Oaks, CA (United States)
- Rice Univ., Houston, TX (United States); Peking Univ., Beijing (China)
- Publication Date:
- Research Org.:
- Rice Univ., Houston, TX (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1499925
- Grant/Contract Number:
- FG02-06ER46274
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
Citation Formats
Du, Lingjie, Li, Xinwei, Lou, Wenkai, Sullivan, Gerard, Chang, Kai, Kono, Junichiro, and Du, Rui-Rui. Evidence for a topological excitonic insulator in InAs/GaSb bilayers. United States: N. p., 2017.
Web. doi:10.1038/s41467-017-01988-1.
Du, Lingjie, Li, Xinwei, Lou, Wenkai, Sullivan, Gerard, Chang, Kai, Kono, Junichiro, & Du, Rui-Rui. Evidence for a topological excitonic insulator in InAs/GaSb bilayers. United States. https://doi.org/10.1038/s41467-017-01988-1
Du, Lingjie, Li, Xinwei, Lou, Wenkai, Sullivan, Gerard, Chang, Kai, Kono, Junichiro, and Du, Rui-Rui. Thu .
"Evidence for a topological excitonic insulator in InAs/GaSb bilayers". United States. https://doi.org/10.1038/s41467-017-01988-1. https://www.osti.gov/servlets/purl/1499925.
@article{osti_1499925,
title = {Evidence for a topological excitonic insulator in InAs/GaSb bilayers},
author = {Du, Lingjie and Li, Xinwei and Lou, Wenkai and Sullivan, Gerard and Chang, Kai and Kono, Junichiro and Du, Rui-Rui},
abstractNote = {Electron–hole pairing can occur in a dilute semimetal, transforming the system into an excitonic insulator state in which a gap spontaneously appears at the Fermi surface, analogous to a Bardeen–Cooper–Schrieffer (BCS) superconductor. Here, we report optical spectroscopic and electronic transport evidence for the formation of an excitonic insulator gap in an inverted InAs/GaSb quantum-well system at low temperatures and low electron–hole densities. Terahertz transmission spectra exhibit two absorption lines that are quantitatively consistent with predictions from the pair-breaking excitation dispersion calculated based on the BCS gap equation. Low-temperature electronic transport measurements reveal a gap of ~2 meV (or ~25 K) with a critical temperature of ~10 K in the bulk, together with quantized edge conductance, suggesting the occurrence of a topological excitonic insulator phase.},
doi = {10.1038/s41467-017-01988-1},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {Thu Dec 07 00:00:00 EST 2017},
month = {Thu Dec 07 00:00:00 EST 2017}
}
Web of Science
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