Sound modes of a two-dimensional electron gas bound to a helium film |
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| Authors: | Whittak Huang J Rudnick A J Dahm |
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| Affiliation: | (1) Case Western Reserve University, Cleveland, Ohio;(2) Case Western Reserve University, Cleveland, Ohio;(3) School of Mathematical and Physical Sciences, University of Sussex, Falmer, Brighton, UK;(4) Present address: Computer Science Corporation, Silver Spring, Maryland |
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| Abstract: | The dispersion relation for a two-dimensional gas of electrons bound to a helium film on a metal substrate is derived and shown to be linear ink for smallk. Both the bulk compressibility of the  dipole gas and the response of the electrons in the substrate contribute to the sound velocity. The collision time for electron scattering from third-sound excitations is calculated in the limit of low temperatures, low electron densities, and thin films and the effective mass of self-trapped electrons is estimated.This work is supported in part by the National Science Foundation.Fulbright-Hays Fellow. |
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