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- W4310421929 abstract "Hydrodynamic electrons flowing through a two-dimensional channel are predicted to undergo a plasma instability above a critical drift velocity. This Dyakonov-Shur (DS) instability terminates as a coherent nonlinear oscillator, which shows promise as a source of radiation that could fill the so-called terahertz gap. In this work, we study radial flow in a Corbino disk, and demonstrate how the DS instability is substantially enhanced in this geometry, both in terms of a lower critical drift velocity and a higher generated power. Interestingly, hydrodynamic electron flows were recently reported in a graphene sample of this geometry, and our results are therefore directly relevant to current efforts to detect this experimentally elusive phenomenon. The analysis is based on a hydrodynamic approach and features both linearized calculations as well as full numerical simulations of the Navier-Stokes equation." @default.
- W4310421929 created "2022-12-10" @default.
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- W4310421929 date "2022-11-30" @default.
- W4310421929 modified "2023-10-05" @default.
- W4310421929 title "Terahertz radiation from the Dyakonov-Shur instability of hydrodynamic electrons in Corbino geometry" @default.
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- W4310421929 doi "https://doi.org/10.1103/physrevb.106.195432" @default.
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