Hubmann, S. and Budkin, G. V. and Urban, M. and Bel'kov, V. V. and Dmitriev, A. P. and Ziegler, J. and Kozlov, D. A. and Mikhailov, N. N. and Dvoretsky, S. A. and Kvon, Z. D. and Weiss, D. and Ganichev, Sergey D. (2020) Impact Ionization Induced by Terahertz Radiation in HgTe Quantum Wells of Critical Thickness. JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 41 (10). pp. 1155-1169. ISSN 1866-6892, 1866-6906
Full text not available from this repository. (Request a copy)Abstract
We report on the observation of terahertz (THz) radiation induced band-to-band impact ionization in HgTe quantum well (QW) structures of critical thickness, which are characterized by a nearly linear energy dispersion. The THz electric field drives the carriers initializing electron-hole pair generation. The carrier multiplication is observed for photon energies less than the energy gap under the condition that the product of the radiation angular frequency omega and momentum relaxation time tau(l) larger than unity. In this case, the charge carriers acquire high energies solely because of collisions in the presence of a high-frequency electric field. The developed microscopic theory shows that the probability of the light-induced impact ionization is proportional to exp(-E02/E2), with the radiation electric field amplitude E and the characteristic field parameter E-0. As observed in experiment, it exhibits a strong frequency dependence for omega tau >> 1 characterized by the characteristic field E-0 linearly increasing with the radiation frequency omega.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GENERATION; Terahertz; Nonlinearities; Impact ionization; HgTe quantum wells |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Mar 2021 13:18 |
| Last Modified: | 26 Mar 2021 13:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44767 |
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