Influence of the screening model and wave‐function shape on impurity scattering mobility in quantum wire
| Autor: | F. Dessenne, J. L. Thobel, L. Baudry, M. Charef, P. Bourel |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 74:6281-6288 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.355146 |
| Popis: | A theoretical investigation of impurity scattering limited mobility in a quantum wire is presented. The general method of mobility calculation is presented and some approximations are made in order to simplify the problem and reduce the amount of computations. Cylindrical symmetry of the wire is assumed and the carriers are assumed to be confined by an infinite barrier. The mobility has been computed using the exact wave functions and the results are compared with those obtained using constant or Dirac wave‐function approximations. It is shown that the mobility is strongly influenced by the shape of the wave function. The screening effect is introduced using two different models. At high temperatures both models yield similar results whereas at low temperature a significant discrepancy is observed. The influence of important parameters such as wire dimension, carrier density, and temperature on impurity scattering mobility is investigated. A comparison of impurity scattering mobility in quantum well and q... |
| Databáze: | OpenAIRE |
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