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Twisted multilayer nodal superconductors

Tummuru, Tarun and Lantagne-Hurtubise, Étienne and Franz, Marcel (2022) Twisted multilayer nodal superconductors. Physical Review B, 106 (1). Art. No. 014520. ISSN 2469-9950. doi:10.1103/physrevb.106.014520.

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Twisted bilayers of nodal superconductors were recently proposed as a promising platform to host superconducting phases that spontaneously break time-reversal symmetry. Here we extend this analysis to twisted multilayers, focusing on two high-symmetry stackings with alternating (±θ) and constant (θ) twist angles. In analogy to alternating-twist multilayer graphene, the former can be mapped to twisted bilayers with renormalized interlayer couplings, along with a remnant gapless monolayer when the number of layers L is odd. In contrast, the latter exhibits physics beyond twisted bilayers, including the occurrence of “magic angles” characterized by cubic band crossings when L mod 4 = 3. Due to their power-law divergent density of states, such multilayers are highly susceptible to secondary instabilities. Within a BCS mean-field theory, defined in the continuum and on a lattice, we find that both stackings host chiral topological superconductivity in extended regions of their phase diagrams.

Item Type:Article
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URLURL TypeDescription Paper
Lantagne-Hurtubise, Étienne0000-0003-0417-6452
Additional Information:© 2022 American Physical Society. (Received 26 February 2022; revised 6 June 2022; accepted 27 June 2022; published 27 July 2022) We are grateful to O. Can, R. Haenel, P. Kim, S. Plugge, and Z. Ye for illuminating discussions and correspondence. This research was supported in part by NSERC and the Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program. E.L.-H. acknowledges support from the Gordon and Betty Moore Foundation's EPiQS Initiative, Grant No. GBMF8682.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada First Research Excellence FundUNSPECIFIED
Gordon and Betty Moore FoundationGBMF8682
Issue or Number:1
Record Number:CaltechAUTHORS:20220728-729493000
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115939
Deposited By: George Porter
Deposited On:29 Jul 2022 18:42
Last Modified:29 Jul 2022 18:42

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