Supression of magnetic subbands in semiconductor superlattices driven by a laser field

Details Supression of magnetic subbands in semiconductor superlattices driven by a laser field Supression of magnetic subbands in semiconductor superlattices driven by a laser field

1999-05-25

arxiv.org/abs/cond-mat/9905369v1

Physics

Condensed Matter

4 pages RevTex, 2 figures

Scientific paper

10.1006/spmi.1999.0814

The effect of strong laser radiation on magnetic subbands in semiconductor superlattices is investigated. Due to the presence of a magnetic field perpendicular to the growth direction, non-linear effects such as band supression and electron localization become relevant at relatively lower intensities and for any polarization perpendicular to the magnetic field. Electron quasienergies and density of states are calculated in the Kramers-Henneberger approximation, whose validity is discussed. The conditions under which collapse of magnetic subbands and quenching of N-photon emission or absorption processes occur are discussed. We conclude that at laser frequencies close to cyclotronic frequency and intensities typical of c.w. lasers, magnetic subbands become flat, magnetotunneling is inhibited and multiphotonic processes dominate optical absorption.

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