Electron Scattering in AlGaN/GaN Structures

Details Electron Scattering in AlGaN/GaN Structures Electron Scattering in AlGaN/GaN Structures

2003-12-24

arxiv.org/abs/cond-mat/0312638v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1063/1.1655704

We present data on mobility lifetime, $\tau_t$, quantum lifetime, $\tau_q$, and cyclotron resonance lifetime, $\tau_{CR}$, of a sequence of high-mobility two-dimensional electron gases in the AlGaN/GaN system, covering a density range of $\sim1-4.5\times10^{12}$cm$^{-2}$. We observe a large discrepancy between $\tau_q$ and $\tau_{CR}$ ($\tau_q\sim\tau_{CR}$/6) and explain it as the result of density fluctuations of only a few percent. Therefore, only $\tau_{CR}$ --and not $\tau_q$ -- is a reliable measure of the time between electron scattering events in these specimens. The ratio $\tau_t / \tau_{CR}$ increases with increasing density in this series of samples, but scattering over this density range remains predominantly in the large-angle scattering regime.

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