ac-Field-Controlled Anderson Localization in Disordered Semiconductor Superlattices

Details ac-Field-Controlled Anderson Localization in Disordered Semiconductor Superlattices ac-Field-Controlled Anderson Localization in Disordered Semiconductor Superlattices

1995-05-11

arxiv.org/abs/cond-mat/9505043v1

Physics

Condensed Matter

10 pages, Latex; figures available on request from hone@itp.ucsb.edu;

Scientific paper

10.1103/PhysRevLett.75.3914

An ac field, tuned exactly to resonance with the Stark ladder in an ideal tight binding lattice under strong dc bias, counteracts Wannier-Stark localization and leads to the emergence of extended Floquet states. If there is random disorder, these states localize. The localization lengths depend non-monotonically on the ac field amplitude and become essentially zero at certain parameters. This effect is of possible relevance for characterizing the quality of superlattice samples, and for performing experiments on Anderson localization in systems with well-defined disorder.

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