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Proximity-induced Majorana hinge modes in antiferromagnetic topological insulators

Peng, Yang and Xu, Yong (2019) Proximity-induced Majorana hinge modes in antiferromagnetic topological insulators. Physical Review B, 99 (19). Art. No. 195431. ISSN 2469-9950. doi:10.1103/PhysRevB.99.195431.

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We propose a realization of chiral Majorana modes propagating on the hinges of a 3D antiferromagnetic topological insulator, which was recently theoretically predicted and experimentally confirmed in the tetradymite-type MnBi_2Te_4-related ternary chalgogenides. These materials consist of ferromagnetically ordered 2D layers, whose magnetization direction alternates between neighboring layers, forming an antiferromagnetic order. Besides surfaces with a magnetic gap, there also exist gapless surfaces with a single Dirac cone, which can be gapped out when proximity coupled to an s-wave superconductor. On the sharing edges between the two types of gapped surfaces, the chiral Majorana modes emerge. We further propose experimental signatures of these Majoana hinge modes in terms of two-terminal conductance measurements.

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Peng, Yang0000-0002-8868-2928
Additional Information:© 2019 American Physical Society. Received 27 September 2018; revised manuscript received 1 May 2019; published 17 May 2019. Y.P. acknowledges support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation, and support from the Walter Burke Institute for Theoretical Physics at Caltech. Y.X. acknowledges support from the Basic Science Center Project of NSFC (Grant No. 51788104), the Ministry of Science and Technology of China (Grant Nos. 2018YFA0307100 and 2018YFA0305603), the National Thousand-Young-Talents Program and Tsinghua University Initiative Scientific Research Program.
Group:Institute for Quantum Information and Matter, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
National Natural Science Foundation of China51788104
Ministry of Science and Technology (China)2018YFA0307100
Ministry of Science and Technology (China)2018YFA0305603
China 1000-Young Talents PlanUNSPECIFIED
Tsinghua UniversityUNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:20181129-150354355
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91340
Deposited By: Tony Diaz
Deposited On:29 Nov 2018 23:35
Last Modified:16 Nov 2021 03:40

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