期刊
COMMUNICATIONS PHYSICS
卷 5, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s42005-022-00992-2
关键词
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资金
- National Research Foundation [NRF-2020R1A4A3079707, NRF-2021R1A2C1093060]
- European Research Council (ERC) under the European Union [771537]
- Institute for Basic Science in the Republic of Korea [IBS-R024-D1]
This study theoretically reports a triple point semimetal that stabilizes an s-wave spin-triplet pairing through triple point fermions. The research provides guidance in searching for spin-triplet superconductivity.
Spin-triplet superconductors are expected to host topological excitations, which makes them potentially useful materials for future quantum technologies. Here, the authors theoretically report a triple point semimetal that, through triple point fermions, stabilizes an s-wave spin-triplet pairing distinct from conventional BCS and other multi-band superconductors. Superconductivity in topological semimetals gives a new paradigm of unconventional superconductors. Their exotic gap structures and topological properties have fascinated searching for material realizations and applications. In this work, we focus on a triple point semimetal where quasiparticle excitations, triple point fermions, carry the effective integer spin-1 in two distinct valleys. Our work demonstrates that the triple point fermion stabilizes inter-valley s-wave spin-triplet pairing. This is due to Fermi statistics, which strictly forbids the formation of inter-valley s-wave spin-singlet pairings. This feature is clearly distinct from the BCS and other multi-band superconductors. We find that two distinct inter-valley s-wave spin-triplet superconductors are allowed which in principle can be controlled by tuning the chemical potential: time-reversal symmetric (s(z)) state with topologically protected nodal lines and time-reversal broken (s(x) + is(y)) state with topologically protected Bogoliubov Fermi surfaces. Our study provides guidance in searching for spin-triplet superconductivity.
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