期刊
SCIENCE
卷 374, 期 6573, 页码 1381-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abf1077
关键词
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资金
- Ministry of Science and Technology of China [2019YFA0308600, 2020YFA0309000]
- NSFC [11790313, 11521404, 92065201, 12104292, 11634009, 11874256, 11874258, 12074247, 11861161003]
- DOE Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0018945, DE-SC0019275]
- David and Lucile Packard Foundation
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]
- Science and Technology Commission of Shanghai Municipality [2019SHZDZX01, 19JC1412701, 20QA1405100]
- China Postdoctoral Science Foundation [BX2021184]
This study utilized the proximity effect of the superconductor niobium diselenide (NbSe2) on bismuth telluride (Bi2Te3) thin films to observe a gapless superconducting state with a segmented Fermi surface, proving the strong impact of finite Cooper pair momentum on the quasiparticle spectrum.
A sufficiently large supercurrent can close the energy gap in a superconductor and create gapless quasiparticles through the Doppler shift of quasiparticle energy caused by finite Cooper pair momentum. In this gapless superconducting state, zero-energy quasiparticles reside on a segment of the normal-state Fermi surface, whereas the remaining Fermi surface is still gapped. We use quasiparticle interference to image the field-controlled Fermi surface of bismuth telluride (Bi2Te3) thin films under proximity effect from the superconductor niobium diselenide (NbSe2). A small applied in-plane magnetic field induces a screening supercurrent, which leads to finite-momentum pairing on the topological surface states of Bi2Te3. We identify distinct interference patterns that indicate a gapless superconducting state with a segmented Fermi surface. Our results reveal the strong impact of finite Cooper pair momentum on the quasiparticle spectrum.
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