Olbrich, P. and Kamann, J. and Koenig, M. and Munzert, J. and Tutsch, L. and Eroms, J. and Weiss, D. and Liu, Ming-Hao and Golub, L. E. and Ivchenko, E. L. and Popov, V. V. and Fateev, D. V. and Mashinsky, K. V. and Fromm, F. and Seyller, Th. and Ganichev, S. D. (2016) Terahertz ratchet effects in graphene with a lateral superlattice. PHYSICAL REVIEW B, 93 (7): 075422. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
Experimental and theoretical studies on ratchet effects in graphene with a lateral superlattice excited by alternating electric fields of terahertz frequency range are presented. A lateral superlattice deposited on top of monolayer graphene is formed either by periodically repeated metal stripes having different widths and spacings or by interdigitated comblike dual-grating-gate (DGG) structures. We show that the ratchet photocurrent excited by terahertz radiation and sensitive to the radiation polarization state can be efficiently controlled by the back gate driving the system through the Dirac point as well as by the lateral asymmetry varied by applying unequal voltages to the DGG subgratings. The ratchet photocurrent includes the Seebeck thermoratchet effect as well as the effects of "linear" and "circular" ratchets, sensitive to the corresponding polarization of the driving electromagnetic force. The experimental data are analyzed for the electronic and plasmonic ratchets taking into account the calculated potential profile and the near field acting on carriers in graphene. We show that the photocurrent generation is based on a combined action of a spatially periodic in-plane potential and the spatially modulated light due to the near-field effects of the light diffraction.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FIELD-EFFECT TRANSISTORS; ELECTRONIC TRANSPORT; DEEP IMPURITIES; QUANTUM-WELLS; PHOTODETECTORS; SEMICONDUCTORS; IONIZATION; DEVICES; |
| 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: | 12 Mar 2019 11:34 |
| Last Modified: | 12 Mar 2019 11:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2404 |
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