Measurements of the density-dependent many-body electron mass in two dimensional GaAs/AlGaAs heterostructures

Y. W. Tan, J. Zhu, H. L. Stormer, L. N. Pfeiffer, K. W. Baldwin, K. W. West

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Abstract

We determine the density-dependent electron mass m* in two-dimensional electron systems of GaAs/AlGaAs heterostructures by performing detailed low-temperature Shubnikov-de Haas measurements. Using very high-quality transistors with tunable electron densities we measure m* in single, high mobility specimens over a wide range of rs (6 to 0.8). Toward low densities we observe a rapid increase of m* by as much as 40%. For 2 > rs > 0.8 the mass values fall ∼10% below the band mass of GaAs. Numerical calculations are in qualitative agreement with our data but differ considerably in detail.

Original languageEnglish (US)
Article number016405
JournalPhysical Review Letters
Volume94
Issue number1
DOIs
Publication statusPublished - Jan 14 2005

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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