Charge transport in two-dimensional disordered systems with an external electric field

R. F. Dutra, M. S. Santos Junior, D. Messias, C. V. C. Mendes, M. O. Sales and F. A. B. F. de Moura
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R. F. Dutra: Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil
M. S. Santos Junior: Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil
D. Messias: Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil
C. V. C. Mendes: Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil
M. O. Sales: ��Instituto Federal do Maranhão (IFMA), Campus São João dos Patos, Rua Padre Santiago, s/n, Centro, São João dos Patos, MA 65665-000, Brazil
F. A. B. F. de Moura: Instituto de Física, Universidade Federal de Alagoas, Maceió, AL 57072-970, Brazil

International Journal of Modern Physics C (IJMPC), 2023, vol. 34, issue 08, 1-11

Abstract: In this paper, we consider a square lattice with correlated random hopping terms under the effect of an external electric field. We analyzed the dynamics of an initially localized electronic wave packet using a Taylor formalism to solve the Schrödinger dynamic equation. Our calculations suggest that the correlated disorder promotes a fast electronic propagation for intermediate times. When we switch on a static electric field, we observe an oscillatory behavior similar to the well-known “Bloch oscillations†phenomenology. We calculate the frequency of these oscillations, and our results are in good agreement with those predicted by the semi-classical approach used in crystalline lattices. Based on the local disorder and in the absence of extended states in our model, we discussed the stability of these apparent “Bloch oscillations†.

Keywords: Localization; correlated disorder; electric field (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1142/S0129183123501103

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