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Surface acoustic wave propagation and inhomogeneities in low-density two-dimensional electron systems near the metal-insulator transition |
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| Authors: | L.A. Tracy M.P. Lilly K.W. West |
| Affiliation: | a Department of Physics, California Institute of Technology, 1200 E. California Blvd. Pasadena, CA 91125, USA b Sandia National Laboratories, Albuquerque, NM 87185, USA c Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA |
| Abstract: | We have measured the surface acoustic wave velocity shift in a GaAs/AlGaAs heterostructure containing a two-dimensional electron system (2DES) in a low-density regime (<1010 cm−2) at zero magnetic field. The interaction of the surface acoustic wave with the 2DES is not well described by a simple model using low-frequency conductivity measurements. We speculate that this conflict is a result of inhomogeneities in the 2DES, which become very important at low density. This has implications for the putative metal-insulator transition in two dimensions. |
| Keywords: | 71.30.+h 73.40.&minus c 72.50.+b |
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