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Published on: March 30, 2017
Kelvin-Mach Wake in a Two-Dimensional Fermi Sea
Eugene B Kolomeisky1, Joseph P Straley2
1Department of Physics, University of Virginia, P. O. Box 400714, Charlottesville, Virginia 22904-4714, USA.
Abstract:
The dispersion law for plasma oscillations in a two-dimensional electron gas in the hydrodynamic approximation interpolates between Ω∝sqrt[q] and Ω∝q dependences as the wave vector q increases. As a result, downstream of a charged impurity in the presence of a uniform supersonic electric current flow, a wake pattern of induced charge density and potential is formed whose geometry is controlled by the Mach number M. For 1
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