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Boundary Instability of a Two-dimensional Electron Fluid
Dyakonov M.I.
Semiconductors 42/8 (2008) 984-988 - http://hal.in2p3.fr/in2p3-00259662
Physique/Matière Condensée/Systèmes mésoscopiques et effet Hall quantique
Boundary Instability of a Two-dimensional Electron Fluid
M. I. Dyakonov1
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
CNRS : UMR5207 – IN2P3 – Université Montpellier II - Sciences et techniques
Bât 13- 1er Et. - CC 070 Place Eugène Bataillon 34095 MONTPELLIER CEDEX 5
It was shown previously that the current-carrying state of a Field Effect Transistor with asymmetric source and drain boundary conditions may become unstable against spontaneous generation of plasma waves [1]. By extending the analysis to the two-dimensional case we find that the dominant instability modes correspond to waves propagating in the direction perpendicular to the current and localized near the boundaries. This new type of instability should result in plasma turbulency with a broad frequency spectrum. More generally, it is shown that a similar instability might exist, when a strong enough current goes through a single boundary between the gated and ungated regions.

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5 pages, 4 figures
Plasma instability – terahertz emission – low dimensional system
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