ac ballistic transport in a two-dimensional electron gas measured in GaAs AlGaAs heterostructures

Sungmu Kang, Peter J. Burke, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We measure the crossover from diffusive to ballistic transport as a function of frequency in dc contacted high-mobility two-dimensional electron gas structures in GaAs AlGaAs heterostructures at GHz frequencies. By systematically measuring samples of varying mobility we demonstrate that the crossover frequency scales with mobility as predicted by the Drude model. We find the ohmic contact impedance to be real and independent of frequency for samples with mobility higher than 500000cm2 Vs, while there is a significant capacitive component in parallel with the contact resistance for lower mobility samples.

Original languageEnglish (US)
Article number165312
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number16
DOIs
StatePublished - Oct 15 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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