Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session P15: Semiconductors: Beyond CMOS Materials & Ballistic Transport
2:30 PM–5:30 PM,
Wednesday, March 7, 2018
LACC Room: 304C
Sponsoring Unit: FIAP
Abstract: P15.00012 : Kinetic Theory of the Dyakonov-Shur Instability*
4:42 PM–4:54 PM
One of the most promising routes to the spontaneous generation of terahertz radiation is the Dyakonov-Shur instability of a two-dimensional electron gas [Dyakonov and Shur, Phys. Rev. Lett. 71, 2465 (1993)]. This instability arises from a non-standard, but experimentally achievable choice of boundary conditions on the electron gas, coupled to a uniform background current flow. Despite much circumstantial evidence for this instability, a clean experimental realization has proven to be difficult, most likely since the instability was implicitly deep in a hydrodynamic regime, where electrons collide with each other at a rate 1/τee much larger than Umklapp or phonon/impurity collisions. In this talk, we will investigate the fate of the instability across the hydrodynamic-to-ballistic transition via semiclassical kinetic theory. While the instability disappears in an intermediate regime of τee, it reappears in the ballistic limit τee → ∞ for certain boundary conditions.
*U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02-76SF00515 and Alexander von Humboldt Foundation via a Feodor Lynen fellowship (C.M.); Gordon and Betty Moore Foundation's EPiQS Initiative through Grant GBMF4302 (A.L.)
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