Electrons, holes, and the hall effect in amorphous silicon
Holender, J. M.
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The double sign anomaly in hydrogenated amorphous silicon, observed by LeComber et.al.in 1977, has remained puzzling ever since. Recently we attacked this problem from two different directions using the equation-of-motion method. Calculations reproduce the double sign anomaly and were rationalised in terms of the behaviour of the spectral function. In a new type of calculation the motion of a ‘wave packet’ was studied in an applied field. Behaviour characteristics of positive and negative effective masses was found in the same ranges of energy for crystalline and a-Si. A perturbation theory is given for reconciling these results.
- RP-Department of Physics