Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01988-1
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Funding
- NSF [DMR-1207562, DMR-1508644, DMR-1310138, DMR-1157490]
- DOE [DE-FG02-06ER46274]
- NSFC [11434010]
- State of Florida
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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 similar to 2 meV (or similar to 25 K) with a critical temperature of similar to 10 K in the bulk, together with quantized edge conductance, suggesting the occurrence of a topological excitonic insulator phase.
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