Bandgap modulation in photoexcited topological insulator Bi2Te3 via atomic displacements | Zendy

Masaki Hada | Zendy; Katsura Norimatsu | Zendy; Seiichi Tanaka | Zendy; Sercan Keskin | Zendy; Tetsuya Tsuruta | Zendy; Kyushiro Igarashi | Zendy; T. Ishikawa | Zendy; Yōsuke Kayanuma | Zendy; R. J. Dwayne Miller | Zendy; Ken Onda | Zendy; T. Sasagawa | Zendy; Shinya Koshihara | Zendy; Kazutaka G. Nakamura | Zendy

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Bandgap modulation in photoexcited topological insulator Bi2Te3 via atomic displacements

Author(s) -

Masaki Hada,

Katsura Norimatsu,

Seiichi Tanaka,

Sercan Keskin,

Tetsuya Tsuruta,

Kyushiro Igarashi,

T. Ishikawa,

Yōsuke Kayanuma,

R. J. Dwayne Miller,

Ken Onda,

T. Sasagawa,

Shinya Koshihara,

Kazutaka G. Nakamura

Publication year - 2016

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.4955188

Subject(s) - photoexcitation , topological insulator , band gap , bismuth , electronic structure , materials science , infrared , spectroscopy , optoelectronics , chemistry , molecular physics , atomic physics , condensed matter physics , physics , optics , excited state , quantum mechanics , metallurgy

The atomic and electronic dynamics in the topological insulator (TI) Bi₂Te₃ under strong photoexcitation were characterized with time-resolved electron diffraction and time-resolved mid-infrared spectroscopy. Three-dimensional TIs characterized as bulk insulators with an electronic conduction surface band have shown a variety of exotic responses in terms of electronic transport when observed under conditions of applied pressure, magnetic field, or circularly polarized light. However, the atomic motions and their correlation between electronic systems in TIs under strong photoexcitation have not been explored. The artificial and transient modification of the electronic structures in TIs via photoinduced atomic motions represents a novel mechanism for providing a comparable level of bandgap control. The results of time-domain crystallography indicate that photoexcitation induces two-step atomic motions: first bismuth and then tellurium center-symmetric displacements. These atomic motions in Bi₂Te₃ trigger 10% bulk bandgap narrowing, which is consistent with the time-resolved mid-infrared spectroscopy results

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