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Carbon systems
Terahertz photoconductivity in graphene in a magnetic field
Yu. B. Vasil'eva, S. N. Novikovb, S. N. Danilovc, S. D. Ganichevcd a Ioffe Institute, St. Petersburg
b Aalto University, Tietotie 3, 02150 Espoo, Finland
c Terahertz Center TerZ, University of Regensburg, Regensburg, Germany
d CENTERA Laboratories, Institute of High Pressure Physics, Polish Academy of Sciences, 01-142 Warsaw, Poland
Abstract:
The terahertz photoconductivity in epitaxial graphene grown on SiC substrates is investigated in a magnetic field. The magnetic-field dependence of the photoresponse signal amplitude is examined at different electron densities, bias currents, and terahertz radiation intensities. The experimental results are explained well by a photoconductivity mechanism based on the heating of electrons by terahertz radiation. A strong increase in the photoconductivity signal with increasing magnetic field caused by an increase in the relaxation time due to the suppression of electron-electron scattering is observed.
Keywords:
graphene, photoconductivity, terahertz radiation, magnetic field.
Received: 28.11.2019 Revised: 05.12.2019 Accepted: 05.12.2019
Citation:
Yu. B. Vasil'ev, S. N. Novikov, S. N. Danilov, S. D. Ganichev, “Terahertz photoconductivity in graphene in a magnetic field”, Fizika i Tekhnika Poluprovodnikov, 54:4 (2020), 388–393; Semiconductors, 54:4 (2020), 465–470
Linking options:
https://www.mathnet.ru/eng/phts5248 https://www.mathnet.ru/eng/phts/v54/i4/p388
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