Numerical study of relaxation in electron glasses
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URI: http://arxiv.org/abs/cond-mat/9901311URI: http://hdl.handle.net/10317/577
ISSN: 1079-7114
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Pérez Garrido, Antonio; Ortuño Ortín, Miguel; Díaz Sánchez, Anastasio; Cuevas Rodríguez, EmilioKnowledge Area
Física AplicadaSponsors
We also acknowledge the Dirección General de Investigación Científica y Técnica for financial support, project number PB 96/1118, and for APG’s grant.Publication date
1999Publisher
American Physical SocietyBibliographic Citation
PÉREZ GARRIDO, A., ORTUÑO, M., DÍAZ SÁNCHEZ, A., CUEVAS, E. Numerical study of relaxation in electron glasses. Physical Review Letters , 59: 5328-5332, 1999. ISSN 1079-7114Keywords
CristalesTemperatura
Proceso de relajación
Baja enegía
Crystals
Temperature
Relaxation process
Low energy
Abstract
We perform a numerical simulation of energy relaxation in three–dimensional electron glasses in the strongly localized regime at finite temperatures. We consider systems with no interactions, with long-range Coulomb interactions and with short-range interactions, obtaining a power law
relaxation with an exponent of 0.15, which is independent of the parameters of the problem and of the type of interaction. At very long times, we always find an exponential regime whose characteristic time strongly depends on temperature, system size, interaction type and localization radius. We extrapolate the longest relaxation time to macroscopic sizes and, for interacting samples, obtain
values much larger than the measuring time. We finally study the number of electrons participating in the relaxation processes of very low energy configurations.
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