Energy gap of topological surface states in proximity to a magnetic insulator

Wang, Jiashu; Wang, Tianyi; Ozerov, Mykhaylo; Zhang, Zhan; Bermejo-Ortiz, Joaquin; Bac, Seul-Ki; Trinh, Hoai; Zhukovskyi, Maksym; Orlova, Tatyana; Ambaye, Haile; Keum, Jong; de Vaulchier, Louis-Anne; Guldner, Yves; Smirnov, Dmitry; Lauter, Valeria; Liu, Xinyu; Assaf, Badih A.

doi:10.1038/s42005-023-01327-5

Title: Energy gap of topological surface states in proximity to a magnetic insulator

Journal Article · Sat Aug 05 00:00:00 EDT 2023 · Communications Physics

DOI:https://doi.org/10.1038/s42005-023-01327-5· OSTI ID:1993858

; Wang, Tianyi; Ozerov, Mykhaylo; Zhang, Zhan; Bermejo-Ortiz, Joaquin;

; Trinh, Hoai; Zhukovskyi, Maksym; Orlova, Tatyana; Ambaye, Haile;

; de Vaulchier, Louis-Anne; Guldner, Yves; Smirnov, Dmitry;

;

Abstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb _1-x Sn _x Se–EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

OSTI ID:: 1993858

Alternate ID(s):: OSTI ID: 1999011

Journal Information:: Communications Physics, Journal Name: Communications Physics Vol. 6 Journal Issue: 1; ISSN 2399-3650

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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