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VOLUME 62 (1995) | ISSUE 4 | PAGE 318
Light absorption by superlattices in crossed electric and magnetic fields: strong-field limit
It is shown that in crossed electric and magnetic fields in the strong electric field limit (Wannier-Stark ladder regime) a magnetic field of any magnitude plays the role of a small perturbation. The electric field destroys the complicated structure of the spectrum in a magnetic field. The role of the magnetic field reduces to a weak modulation of the Wannier-Stark ladder as a function of the level number. It is also shown that in contrast to the weak-field limit, the interband light absorption coefficient is not exponentially small as the electric field increases. The predicted behavior can be directly checked experimentally on semiconductor superlattices. © 1995 American Institute of Physics.