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Floquet-driven indirect exchange interaction mediated by topological insulator surface states

Journal Article · · Physical Review. B
 [1];  [2];  [3]
  1. University of Alabama, Tuscaloosa, AL (United States); University of Alabama
  2. Kennesaw State University, Marietta, GA (United States)
  3. University of Alabama, Tuscaloosa, AL (United States)
Light drives offer a potential tool for the dynamical control of magnetic interactions in matter. We theoretically investigate the indirect exchange coupling between two parallel chains of magnetic impurities on the surface of a topological insulator, driven by a time-periodic circularly polarized light field in the high-frequency, off-resonant regime. We derive a closed-form analytic expression for the spin susceptibility of the photon-dressed topological insulator surface states and obtain the irradiation dependence of the Ising, Heisenberg, and Dzyaloshinskii-Moriya exchange couplings between the impurity chains. Our results show a two-pronged modification of these exchange couplings by periodic drives. First, the Ruderman-Kittel-Kasuya-Yosida (RKKY) oscillation period of the exchange couplings can be extended by enhancing the driving strength. Second, increasing driving strength enhances the envelope of RKKY oscillations of the Ising type while suppressing those of the Heisenberg type and Dzyaloshinskii-Moriya type. Furthermore, our work provides useful insights for realizing Floquet engineering of collinear and noncollinear indirect exchange interactions in topological insulating systems.
Research Organization:
University of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019326
OSTI ID:
2417614
Alternate ID(s):
OSTI ID: 2474657
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 3 Vol. 110; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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