Otteneder, M. and Kvon, Z. D. and Tkachenko, O. A. and Tkachenko, V. A. and Jaroshevich, A. S. and Rodyakina, E. E. and Latyshev, A. V. and Ganichev, S. D. (2018) Giant Terahertz Photoconductance of Quantum Point Contacts in the Tunneling Regime. PHYSICAL REVIEW APPLIED, 10 (1): 014015. ISSN 2331-7019,
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We report on the observation of the giant photoconductance of a quantum point contact (QPC) in the tunneling regime excited by terahertz radiation. Studied QPCs are formed in a GaAs/(Al, Ga) As heterostructure with a high-electron-mobility two-dimensional electron gas. We demonstrate that irradiation of strongly negatively biased QPCs by laser radiation with frequency f = 0.69 THz and intensity 50mW/cm(2) results in two orders of magnitude enhancement of the QPC conductance. The effect increases with the dark conductivity decrease. It is also characterized by a strong polarization dependence and a drastic reduction of the signal by increasing the radiation frequency to 1.63 THz. We demonstrate that all experimental findings can be well explained by the photon-assisted tunneling through the QPC. Corresponding calculations are in good agreement with the experiment.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 2-DIMENSIONAL ELECTRON-GAS; FAR-INFRARED RADIATION; MICROWAVE-RADIATION; DEEP IMPURITIES; FIELDS; WELLS; IONIZATION; ABSORPTION; TRANSPORT; TIME; |
| 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: | 19 Feb 2020 12:12 |
| Last Modified: | 19 Feb 2020 12:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14229 |
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