Reinhoffer, Chris, Mukai, Yu, Germanskiy, Semyon, Bliesener, Andrea, Lippertz, Gertjan, Uday, Anjana, Taskin, A. A., Ando, Yoichi, Wang, Zhe and van Loosdrecht, Paul H. M. (2020). Relaxation dynamics of the optically driven nonequilibrium states in the electron- and hole-doped topological-insulator materials (Bi1-xSbx)(2)Te-3. Phys. Rev. Mater., 4 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2475-9953
Full text not available from this repository.Abstract
We report on time-resolved mid-infrared-pump terahertz-transmission-probe studies of the topological insulator materials (Bi1-xSbx)(2)Te-3, in which by varying x charge carriers are chemically tuned to be of n-type or p-type. Relaxation dynamics is found to be different in various aspects for transitions below or above the band gap, which are selectively excited by changing the pump-pulse energy. For the below-band-gap excitation, an exponential decay of the pump-probe signals is observed, which exhibits linear dependence on the pump-pulse fluence. In contrast, the relaxation dynamics for the above-band-gap excitation is characterized by a compressed exponential decay and nonlinear fluence dependence at high pump flunences, which reflects interaction of the excited nonequilibrium states.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||
| Creators: |
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| URN: | urn:nbn:de:hbz:38-309505 | ||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1103/PhysRevMaterials.4.124201 | ||||||||||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | Phys. Rev. Mater. | ||||||||||||||||||||||||||||||||||||||||||||
| Volume: | 4 | ||||||||||||||||||||||||||||||||||||||||||||
| Number: | 12 | ||||||||||||||||||||||||||||||||||||||||||||
| Date: | 2020 | ||||||||||||||||||||||||||||||||||||||||||||
| Publisher: | AMER PHYSICAL SOC | ||||||||||||||||||||||||||||||||||||||||||||
| Place of Publication: | COLLEGE PK | ||||||||||||||||||||||||||||||||||||||||||||
| ISSN: | 2475-9953 | ||||||||||||||||||||||||||||||||||||||||||||
| Language: | English | ||||||||||||||||||||||||||||||||||||||||||||
| Faculty: | Faculty of Mathematics and Natural Sciences | ||||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II | ||||||||||||||||||||||||||||||||||||||||||||
| Subjects: | no entry | ||||||||||||||||||||||||||||||||||||||||||||
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| Refereed: | Yes | ||||||||||||||||||||||||||||||||||||||||||||
| URI: | http://kups.ub.uni-koeln.de/id/eprint/30950 |
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