Abstract
We interpret the recent observations of Otsuji’s team (Sendai) on switching from absorption to amplification at a temperature of T = 300 K during the passage of terahertz radiation through hexagonal boron nitride–graphene sandwiches with multiple gates on the surface with an increase in the electric field in graphene. It is shown that these effects are related to dispersion and negative conductivity near the transit-time frequency of electrons in momentum space under streaming (anisotropic distribution) in graphene in a strong electric field. On the basis of these data, a universal tunable terahertz source is proposed, which has the form of a graphene-containing sandwich with a high-resistance silicon wafer (a cavity) with an applied voltage. This terahertz cavity is a complete analog of the microwave generator implemented on an InP chip by Vorobev’s team (St. Petersburg).
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ACKNOWLEDGMENTS
We are grateful to V.I. Gavrilenko (Institute for Physics of Microstructures, Russian Academy of Sciences) who drew our attention to studies [1, 20], M.A. Novikov, A.M. Klushin (Institute for Physics of Microstructures, Russian Academy of Sciences), M.Yu. Glyavin and A. Fedotov (Institute of Applied Physics, Russian Academy of Sciences) for interest in our work, V.I. Ryzhii (Institute of Microwave Semiconductor Electronics, Russian Academy of Sciences) and V.V. Kurin (Institute for Physics of Microstructures, Russian Academy of Sciences) for discussion and comments to the work.
Funding
This study was carried out as part of the state contract of the Institute for Physics of Microstructures, Russian Academy of Sciences no. 0035-2019-0021-S-01.
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Translated by E. Bondareva
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Andronov, A.A., Pozdniakova, V.I. Terahertz Dispersion and Amplification under Electron Streaming in Graphene at 300 K. Semiconductors 54, 1078–1085 (2020). https://doi.org/10.1134/S106378262009002X
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DOI: https://doi.org/10.1134/S106378262009002X