Dipole scattering in polarization induced two-dimensional electron gases

Details Dipole scattering in polarization induced two-dimensional electron gases Dipole scattering in polarization induced two-dimensional electron gases

2000-04-12

arxiv.org/abs/cond-mat/0004204v1

Physics

Condensed Matter

Materials Science

8 pages, 5 figures

Scientific paper

10.1063/1.1311832

Unusually large spontaneous and piezoelectric fields in the III-V nitrides have led to the making of an entirely new class of two-dimensional electron gas. Fluctuation from a perfectly periodic binary structure in highly polar semiconductor alloys present the same physical situation as a random distribution of microscopic dipoles. The excess dipole distribution in the barrier layers is evaluated by a method similar to the virtual crystal approximation. It is shown that the mobility of electrons in the two-dimensional electron gas formed in highly polar heterostructures is intrinsically limited by scattering from such dipoles.

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