Einstein Relationship and Relaxation Current in a Tail at Zero Temperature

Autor: A. N. Samukhin, O. Bleibaum, V. V. Bryksin, Harald Böttger
Rok vydání: 2002
Předmět:
Zdroj: physica status solidi (b). 230:21-24
ISSN: 1521-3951
0370-1972
Popis: We outline results on the calculation of the transport coefficients for a non-equilibrium charge carrier moving in an arbitrary density of states. The equations for the calculation of the transport coefficients are completed by constitutive equations governing their dispersion, and an equation for the calculation of the diffusion propagator in the quasi-elastic limit. Our results show that the motion of the charge carrier is dispersive also at relatively large times. Furthermore, the Einstein relationship depends on the derivative of the density of states with respect to energy. Positive or negative relaxation currents are obtained if the density of states either increases or decreases with increasing energy. Furthermore, in order to compare our results with those obtained in the literature we focus on an exponential density of states.
Databáze: OpenAIRE
Externí odkaz: