1 Department of Micro- and Nanotechnology, Technical University of Denmark2 Center for Nanostructured Graphene, Center, Technical University of Denmark
We theoretically study the effect of THz radiation on the linear optical absorption spectra of semiconductor structures. A general theoretical framework, based on nonequilibrium Green functions, is formulated and applied to the calculation of linear optical absorption spectrum for several nonequilibrium mesoscopic structures. We show that a blueshift occurs and sidebands appear in bulklike 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. [S0163-1829(95)03412-2].
Physical Review B Condensed Matter, 1998, Vol 57, Issue 15, p. 8860-8872