Electron scattering in AlGaN/GaN structures

Syed, S.; Manfra, M.J.; Wang, Y.J.; Molnar, R.J.; Stormer, H.L.
March 2004
Applied Physics Letters;3/1/2004, Vol. 84 Issue 9, p1507
Academic Journal
We present data on mobility lifetime τ[sub t], quantum lifetime τ[sub q], and cyclotron resonance lifetime τ[sub CR], of a sequence of high-mobility two-dimensional electron gases in the AlGaN/GaN system, covering a density range of 1 to 4.5×10[sup 12] cm[sup -2]. We observe a large discrepancy between τ[sub q] and τ[sub CR](τ[sub q]∼τ[sub CR]/6), and explain it as the result of density fluctuations of only a few percent. Therefore, only τ[sub CR]—and not τ[sub q]—is a reliable measure of the time between electron-scattering events in these specimens. The ratio τ[sub t]/τ[sub CR] increases with increasing density in this series of samples, but scattering over this density range remains predominantly in the large-angle scattering regime. © 2004 American Institute of Physics.


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