We investigate the ultrafast spin dynamics of the prototypical topological insulator Bi2Se3 using time-resolved Kerr rotation (polarization-change) measurements across near-infrared wavelengths. The Kerr rotation angle of Bi2Se3 was found to significantly depend on the photon energy around a resonance transition ( ) of bulk states, as well as the ellipticity of the pump light, in the presence of spin excitation. The observed photon-energy dependence of can be well simulated by assuming spin-dependent refractive-index changes in the presence of bandgap renormalization and state-filling effect upon photoexcitation. Our study delivers comprehensive insights into the opto-spintronic properties of bulk Bi2Se3 and the fundamental physical processes underlying polarization changes. These findings are expected to be crucial in developing ultrafast magneto-optical memory devices, which can perform read-and-write operations in the terahertz regime.
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3 June 2024
Research Article|
June 06 2024
Spin-dependent bandgap renormalization and state-filling effect in Bi2Se3 observed by ultrafast Kerr rotation
Special Collection:
Topological and Chiral Matter – Physics and Applications
Kazuhiro Kikuchi
;
Kazuhiro Kikuchi
a)
(Conceptualization, Formal analysis, Investigation, Validation, Writing – original draft, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Yu Mizukoshi
;
Yu Mizukoshi
(Investigation, Supervision, Validation, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
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Takumi Fukuda
;
Takumi Fukuda
(Funding acquisition, Investigation, Supervision, Validation, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
2
Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University
, 1919-1 Tancha, Onna, Okinawa, Japan
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Paul Fons
;
Paul Fons
(Resources, Software, Writing – review & editing)
3
Department of Electronics and Electrical Engineering, School of Integrated Design Engineering, Keio University
, 4-1-1 Hiyoshi, Kohoku District, Yokohama City 223-8521, Japan
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Muneaki Hase
Muneaki Hase
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Resources, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba
, 1-1-1 Tennodai, Tsukuba 305-8573, Japan
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a)Author to whom correspondence should be addressed: [email protected]
Appl. Phys. Lett. 124, 233104 (2024)
Article history
Received:
April 12 2024
Accepted:
May 23 2024
Citation
Kazuhiro Kikuchi, Yu Mizukoshi, Takumi Fukuda, Paul Fons, Muneaki Hase; Spin-dependent bandgap renormalization and state-filling effect in Bi2Se3 observed by ultrafast Kerr rotation. Appl. Phys. Lett. 3 June 2024; 124 (23): 233104. https://doi.org/10.1063/5.0213640
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