期刊
APPLIED PHYSICS LETTERS
卷 100, 期 23, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4726273
关键词
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资金
- National Science Foundation [1106444]
- Russian Foundation for Basic Research
- Russian Academy of Science
We discuss a possible mechanism of the current instability in multi-gated structures with periodic modulation of the electron density in the device channel. In such structures, the plasma wave velocity is periodically modulated as well, and the stationary electric current may become unstable with respect to generation of the plasma oscillations. In the simplest model of periodically alternating stripes of the electron density with plasma wave velocities s(a) and s(b), respectively (s(a) < s(b)), the instability occurs when the electron drift velocity approaches s(a). For typical parameters, the plasma oscillation frequency can be tuned to be in the terahertz range of frequencies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4726273]
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