期刊
SCIENCE
卷 357, 期 6348, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aai8142
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) through the Collaborative Research Center [SFB 1170, SPP 1666, SCHA1510/5]
- European Research Council (ERC) through starting grant [ERC-StG-Thomale-336012]
Quantum spin Hall materials hold the promise of revolutionary devices with dissipationless spin currents but have required cryogenic temperatures owing to small energy gaps. Here we show theoretically that a room-temperature regime with a large energy gap may be achievable within a paradigm that exploits the atomic spin-orbit coupling. The concept is based on a substrate-supported monolayer of a high-atomic number element and is experimentally realized as a bismuth honeycomb lattice on top of the insulating silicon carbide substrate SiC(0001). Using scanning tunneling spectroscopy, we detect a gap of similar to 0.8 electron volt and conductive edge states consistent with theory. Our combined theoretical and experimental results demonstrate a concept for a quantum spin Hall wide-gap scenario, where the chemical potential resides in the global system gap, ensuring robust edge conductance.
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