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Emergence of topological superconductivity in doped topological Dirac semimetals under symmetry-lowering lattice distortions

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Title
Emergence of topological superconductivity in doped topological Dirac semimetals under symmetry-lowering lattice distortions
Author(s)
Sangmo Cheon; Ki Hoon Lee; Suk Bum Chung; Bohm‑JungYang
Publication Date
2021-12-01
Journal
SCIENTIFIC REPORTS, v.11, no.1
Publisher
NATURE PORTFOLIO
Abstract
Recently, unconventional superconductivity having a zero-bias conductance peak is reported in doped topological Dirac semimetal (DSM) with lattice distortion. Motivated by the experiments, we theoretically study the possible symmetry-lowering lattice distortions and their effects on the emergence of unconventional superconductivity in doped topological DSM. We find four types of symmetry-lowering lattice distortions that reproduce the crystal symmetries relevant to experiments from the group-theoretical analysis. Considering inter-orbital and intra-orbital electron density-density interactions, we calculate superconducting phase diagrams. We find that the lattice distortions can induce unconventional superconductivity hosting gapless surface Andreev bound states (SABS). Depending on the lattice distortions and superconducting pairing interactions, the unconventional inversion-odd-parity superconductivity can be either topological nodal superconductivity hosting a flat SABS or topological crystalline superconductivity hosting a gapless SABS. Remarkably, the lattice distortions increase the superconducting critical temperature, which is consistent with the experiments. Our work opens a pathway to explore and control pressure-induced topological superconductivity in doped topological semimetals.
URI
https://pr.ibs.re.kr/handle/8788114/10360
DOI
10.1038/s41598-021-97982-1
ISSN
2045-2322
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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