Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.206804
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Funding
- JSPS [KAKENHI 23224010]
- JST-CREST
- MEXT of Japan (Innovative Area Topological Quantum Phenomena)
- AFOSR [AOARD 124038]
- Mitsubishi Foundation
- KEK-PF [2012S2-001]
- UVSOR [24-536]
- Grants-in-Aid for Scientific Research [24654096, 24740237, 23224010, 22103001, 25103701, 25287079, 22103004] Funding Source: KAKEN
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We have performed angle-resolved photoemission spectroscopy on the strongly spin-orbit coupled low-carrier density superconductor Sn1-xInxTe (x = 0.045) to elucidate the electronic states relevant to the possible occurrence of topological superconductivity, as recently reported for this compound based on point-contact spectroscopy. The obtained energy-band structure reveals a small holelike Fermi surface centered at the L point of the bulk Brillouin zone, together with a signature of a topological surface state, indicating that this material is a doped topological crystalline insulator characterized by band inversion and mirror symmetry. A comparison of the electronic states with a band-noninverted superconductor possessing a similar Fermi surface structure, Pb1-xTlxTe, suggests that the anomalous behavior in the superconducting state of Sn1-xInxTe is related to the peculiar orbital characteristics of the bulk valence band and/or the presence of a topological surface state.
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