Publication: Coherent electron dynamics in a two-dimensional random system with mobility edges
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2007-02-07
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IOP Publishing Ltd.
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Abstract
We study numerically the dynamics of a one-electron wavepacket in a two-dimensional random lattice with long-range correlated diagonal disorder in the presence of a uniform electric field. The time-dependent Schrodinger equation is used for this purpose. We find that the wavepacket displays Bloch-like oscillations associated with the appearance of a phase of delocalized states in the strong correlation regime. The amplitude of oscillations directly reflects the bandwidth of the phase and allows us to measure it. The oscillations reveal two main frequencies whose values are determined by the structure of the underlying potential in the vicinity of the wavepacket maximum.
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This work was partially supported by CNPq, CAPES, and FINEP (Federal Brazilian Agencies), and FAPEAL (Alagoas State Agencies). Work in Madrid was supported by MEC (project FIS2006-01485). VAM acknowledges support from the Stichting voor Fundamenteel Onderzoek der Materie (FOM) and from ISTC (grant no 2679).
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