Floquet–Bloch manipulation of the Dirac gap in a topological antiferromagnet

Bielinski, Nina; Chari, Rajas; May-Mann, Julian; Kim, Soyeun; Zwettler, Jack; Deng, Yujun; Aishwarya, Anuva; Roychowdhury, Subhajit; Shekhar, Chandra; Hashimoto, Makoto; Lu, Donghui; Yan, Jiaqiang; Felser, Claudia; Madhavan, Vidya; Shen, Zhi-Xun; Hughes, Taylor L.; Mahmood, Fahad

doi:10.1038/s41567-024-02769-6

Floquet–Bloch manipulation of the Dirac gap in a topological antiferromagnet

Journal Article · Tue Jan 21 04:00:00 EST 2025 · Nature Physics

DOI:https://doi.org/10.1038/s41567-024-02769-6· OSTI ID:2575267

^[1]; ^[1]; ^[1]; Kim, Soyeun ^[2]; Zwettler, Jack ^[1]; ^[3]; ^[1]; ^[4]; ^[5]; ^[6]; ^[6]; ^[7]; ^[5]; ^[1]; ^[8]; Hughes, Taylor L. ^[1]; ^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States); Daegu Gyeongbuk Institute of Science and Technology (DGIST) (Korea, Republic of)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Indian Institute of Science Education and Research, Bhopal (India)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)

Floquet–Bloch manipulation, achieved by driving a material periodically with a laser pulse, is a method that enables the engineering of electronic and magnetic phases in solids by effectively modifying the structure of their electronic bands. However, the application of Floquet–Bloch manipulation in topological magnetic systems, particularly those with inherent disorder, remains largely unexplored. Here, in this study, we realize Floquet–Bloch manipulation of the Dirac surface-state mass of the topological antiferromagnet MnBi₂Te₄. Using time- and angle-resolved photoemission spectroscopy, we show that opposite helicities of mid-infrared circularly polarized light result in substantially different Dirac mass gaps in the antiferromagnetic phase, despite the equilibrium Dirac cone being massless. We explain our findings in terms of a Dirac fermion with a random mass. Our results underscore Floquet–Bloch manipulation as a powerful tool for controlling topology, even in the presence of disorder, and for uncovering properties of materials that may elude conventional probes.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF)

Grant/Contract Number:: SC0021238; AC02-76SF00515; SC0022101; AC05-00OR22725

OSTI ID:: 2575267

Alternate ID(s):: OSTI ID: 2585401

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 21; ISSN 1745-2473; ISSN 1745-2481

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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