Coexistence of Surface Ferromagnetism and a Gapless Topological State in MnBi 2 Te 4

Nevola, Dan; Li, Haoxiang  X.; Yan, Jiaqiang; Moore II, Rob  G.; Lee, Ho Nyung; Miao, Hu; Johnson, Peter  D.

doi:10.1103/physrevlett.125.117205

Title: Coexistence of Surface Ferromagnetism and a Gapless Topological State in ${MnBi}_{2} {Te}_{4}$

Journal Article · Wed Sep 09 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.117205· OSTI ID:1646581

^[1]; Li, Haoxiang X. ^[2];

^[2];

^[2]; Johnson, Peter D. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Surface magnetism and its correlation with the electronic structure are critical to understanding the topological surface state in the intrinsic magnetic topological insulator MnBi₂Te₄. Here, using static and time resolved angle-resolved photoemission spectroscopy (ARPES), we find a significant ARPES intensity change together with a gap opening on a Rashba-like conduction band. Comparison with a model simulation strongly indicates that the surface magnetism on cleaved MnBi₂Te₄ is the same as its bulk state. Finally, the inability of surface ferromagnetism to open a gap in the topological surface state uncovers the novel complexity of MnBi₂Te₄ that may be responsible for the low quantum anomalous Hall temperature of exfoliated MnBi₂Te₄.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704; AC05-00OR22725

OSTI ID:: 1646581

Alternate ID(s):: OSTI ID: 1770663

Report Number(s):: BNL-216236-2020-JAAM; TRN: US2202763

Journal Information:: Physical Review Letters, Vol. 125, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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