paper

Linear optical absorption spectra of mesoscopic structures in intense THz fields: free particle properties

arXiv:cond-mat/9704080 · doi:10.1103/PhysRevB.57.8860

Abstract

We theoretically study the effect of THz radiation on the linear optical absorption spectra of semiconductor structures. A general theoretical framework, based on non-equilibrium Green functions, is formulated, and applied to the calculation of linear optical absorption spectrum for several non-equilibrium mesoscopic structures. We show that a blue-shift occurs and sidebands appear in bulk-like structures, i.e., the dynamical Franz-Keldysh effect [A.-P. Jauho and K. Johnsen, Phys. Rev. Lett. 76, 4576 (1996)]. An analytic calculation leads to the prediction that in the case of superlattices distinct stable steps appear in the absorption spectrum when conditions for dynamical localization are met.

13 Pages, RevTex using epsf to include 8 ps figures. Submitted to Phys. Rev. B (3 April 97)

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