Moiré Surface States and Enhanced Superconductivity in Topological Insulators

Wang, Taige; Yuan, Noah F. Q.; Fu, Liang

doi:10.1103/PhysRevX.11.021024

Title: Moiré Surface States and Enhanced Superconductivity in Topological Insulators

Journal Article · Thu Apr 29 00:00:00 EDT 2021 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.11.021024· OSTI ID:1780189

; Yuan, Noah F. Q.; Fu, Liang

Recently, moiré superlattices have been found on the surface of topological insulators due to the rotational misalignment of topmost layers. In this work, we study the effects of moiré superlattices on the topological surface states using a continuum model of Dirac electrons moving in a periodic potential. Unlike twisted bilayer graphene, moiré surface states cannot host isolated bands due to their topological nature. Instead, we find (high-order) van Hove singularities (VHS) in the moiré band structure that give rise to divergent density of states (DOS) and enhance interaction effects. Because of spin-momentum locking in moiré surface states, possible interaction channels are limited. In the presence of phonon mediated attraction, superconductivity is strongly enhanced by the power-law divergent DOS at high-order VHS. The transition temperature T_c exhibits a power-law dependence on the retarded electron-phonon interaction strength λ*. This enhancement is found to be robust under various perturbations from the high-order VHS.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0018945

OSTI ID:: 1780189

Alternate ID(s):: OSTI ID: 1852723

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 11 Journal Issue: 2; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
physics
density of states
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superconductivity
surface states
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van Hove singularity
interfaces
superlattices
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Title: Moiré Surface States and Enhanced Superconductivity in Topological Insulators

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