| Issue |
Europhys. Lett.
Volume 54, Number 5, June 2001
|
|
|---|---|---|
| Page(s) | 647 - 653 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00341-6 | |
| Published online | 01 December 2003 | |
Non-ergodicity and fluctuations in mesoscopic insulators: The replica cooperon and diffuson
1
Laboratorio de Física Estadística de
Sistemas Desordenados, Centro de Física, IVIC Apartado 21827, Caracas 1020A, Venezuela
2
Departamento de Física, Universidad Simón Bolívar Apartado 89000,
Caracas 1080A, Venezuela
Received:
25
September
2000
Accepted:
16
March
2001
We explore the mesoscopic conductance fluctuations in the insulating
regime within the Nguyen, Spivak, and Shklovskii model. We find that
fluctuations of the log-conductance are persistent above the
decorrelation field Bc in the insulating regime. Using the replica
approach, we derive the field coupling and fluctuations in terms of
"cooperon"and "diffuson"analogs and determine new corrections to
temperature dependencies for small 
. We also analyze the
ergodicity of fluctuations in the log-conductance and its scaling
properties, and discuss the asymptotic validity of the usual criterion
involving the commutability of disorder and field fluctuation
averages.
PACS: 72.20.-i – Conductivity phenomena in semiconductors and insulators / 73.50.Dn – Low-field transport and mobility; piezoresistance / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 2001
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