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Terahertz-driven hot Dirac fermion and plasmon dynamics in the bulk-insulating topological insulator Bi2Se3

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Title
Terahertz-driven hot Dirac fermion and plasmon dynamics in the bulk-insulating topological insulator Bi2Se3
Author(s)
Bumjoo Lee; In, Chihun; Moon, Jisoo; Kim, Tae Hoon; Oh, Seongshik; Tae Won Noh; Choi, Hyunyong
Publication Date
2022-01
Journal
Physical Review B, v.105, no.4
Publisher
American Physical Society
Abstract
© 2022 American Physical Society.For degenerately doped three-dimensional topological insulators (3D TIs), the interaction dynamics between Dirac fermions and collective charge oscillations (plasmons) are considerably complicated. In particular, the low-energy contribution near band inversion is largely obscure because of the bulk-surface interaction as well as the two-dimensional electron gas (2DEG). We have circumvented these issues by performing high-field terahertz (THz) pump-probe spectroscopy in bulk insulating Bi2Se3 TI microribbon array structures. Plasmon blueshift of 11% was found to occur within 4 ps under 0.433 MV/cm THz excitation compared to the near-equilibrium state. Although the conventional optical pump or engineered microribbon TIs exhibits a similar plasmon blueshift, our observation is readily explained by the intrinsic plasmon behavior from the increased electronic temperature (Te≅1430K) and reduced chemical potential (μ≅16meV) without considering extrinsic contributions. Our findings may apply to other classes of Dirac materials to investigate the coupled low-energy interactions with collective quasiparticles.
URI
https://pr.ibs.re.kr/handle/8788114/11184
DOI
10.1103/PhysRevB.105.045307
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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