A possible role of D^- band in hopping conductivity and metal-insulator transition in 2D structures

Details A possible role of D^- band in hopping conductivity and metal-insulator transition in 2D structures A possible role of D^- band in hopping conductivity and metal-insulator transition in 2D structures

1999-11-27

arxiv.org/abs/cond-mat/9911450v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, 3 gif-figures

Scientific paper

A simple two-band model is suggested explaining recently reported unusual features for hopping magnetoresistance and the metal-insulator transition in 2D structures. The model implies that the conductivity is dominated by the upper Hubbard band (D^- band). Experimental studies of hopping magnetoresistance for Si delta doped GaAs/AlGaAs heterostructure give additional evidences for the model.

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