期刊
NANO LETTERS
卷 17, 期 2, 页码 973-979出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04312
关键词
Topological insulators; stuface state dynamics; ultrafast photodetector; on-chip THz generation
类别
资金
- DFG [1666]
- ERC-grant NanoREAL
Topological insulators constitute a fascinating class of quantum materials with nontrivial, gapless states on the surface and insulating bulk states. By revealing the optoelectronic dynamics in the whole range from femto- to microseconds, we demonstrate that the long surface lifetime of Bi2Te2Se nanowires allows us to access the surface states by a pulsed photoconduction scheme and that there is a prevailing bolometric response of the surface states. The interplay of the surface and bulk states dynamics on the different time scales gives rise to a surprising physical property of Bi2Te2Se nanowires: their pulsed photoconductance changes polarity as a function of laser power. Moreover, we show that single Bi2Te2Se nanowires can be used as THz generators for on-chip high-frequency circuits at room temperature. Our results open the avenue for single Bi2Te2Se nano wires as active modules in optoelectronic high-frequency and THz circuits.
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