Surface Acoustic Wave Propagation and Inhomogeneities in Low Density Two-Dimensional Electron Systems Near the Metal-Insulator Transition

Tracy, L. A.; Eisenstein, J. P.; Lilly, M. P.; Pfeiffer, L. N.; West, K. W.

doi:10.1016/j.ssc.2005.10.028

arXiv 2005-07-04 DOI 10.1016/j.ssc.2005.10.028 0 views

Surface Acoustic Wave Propagation and Inhomogeneities in Low Density Two-Dimensional Electron Systems Near the Metal-Insulator Transition

Tracy, L. A. · Eisenstein, J. P. · Lilly, M. P. · Pfeiffer, L. N. · West, K. W.

Mesoscale and Nanoscale Physics

Original · EN

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.

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