Volume 70, Number 5, June 2005
|Page(s)||649 - 655|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||11 May 2005|
Quantum fluctuations effects in hopping
Departamento de Física, Universidad de Murcia - Murcia 30071, Spain
Accepted: 11 April 2005
We study quantum effects on Mott's variable-range hopping in one-dimensional (1D) and two-dimensional (2D) systems. In most experimental situations, wave functions are not extremely localized and fluctuations in the localization length are important. We argue that, in order to compare with experiments, it is necessary to consider an effective localization length for hopping different than the standard one, deduced from the zero-temperature conductance. Also, although quantum fluctuations do not qualitatively change Mott's law, they increase the average resistance in 1D systems. They do not alter much the results in 2D systems.
PACS: 72.20.Ee – Mobility edges; hopping transport / 73.21.-b – Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
© EDP Sciences, 2005
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