Otteneder, M. and Dmitriev, I. A. and Candussio, S. and Savchenko, M. L. and Kozlov, D. A. and Bel'kov, V. V. and Kvon, Z. D. and Mikhailov, N. N. and Dvoretsky, S. A. and Ganichev, S. D. (2018) Sign-alternating photoconductivity and magnetoresistance oscillations induced by terahertz radiation in HgTe quantum wells. PHYSICAL REVIEW B, 98 (24): 245304. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We report on the observation of terahertz radiation induced photoconductivity and of terahertz analog of the microwave-induced resistance oscillations (MIRO) in HgTe-based quantum well (QW) structures of different width. The MIRO-like effect has been detected in QWs of 20 nm thickness with inverted band structure and a rather low mobility of about 3 x 10(5) cm(2)/V s. In a number of other structures with QW widths ranging from 5 to 20 nm and lower mobility we observed an unconventional nonoscillatory photoconductivity signal which changes its sign upon magnetic field increase. This effect was observed in structures characterized by both normal and inverted band ordering, as well as in QWs with critical thickness and linear dispersion. In samples having Hall bar and Corbino geometries an increase of the magnetic field resulted in a single and double change of the sign of the photoresponse, respectively. We show that within the bolometric mechanism of the photoresponse these unusual features imply a nonmonotonic behavior of the transport scattering rate, which should decrease (increase) with temperature for magnetic fields below (above) the certain value. This behavior is found to be consistent with the results of dark transport measurements of magnetoresistivity at different sample temperatures. Our experiments demonstrate that photoconductivity is a very sensitive probe of the temperature variations of the transport characteristics, even those that are hardly detectable using standard transport measurements.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CYCLOTRON-RESONANCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Oct 2019 06:56 |
| Last Modified: | 04 Oct 2019 06:56 |
| URI: | https://pred.uni-regensburg.de/id/eprint/13365 |
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