Abstract
The dependence of the localization length on the number of occupied subbands N in low-dimensional semiconductors is investigated. The localization length is shown to be proportional to the number of occupied subbands in quasi-one-dimensional quantum wires, while it grows exponentially with N in quasi-two-dimensional systems. Also, a weak localization theory is developed for large N with a well-defined small expansion parameter 1/N. The temperature dependence of the conductivity deduced using this perturbation theory agrees with the experimentally observed dependence. © 1996 The American Physical Society.
- Received 16 November 1995
DOI:https://doi.org/10.1103/PhysRevB.53.9568
©1996 American Physical Society