Interplay of disorder and tunneling in coupled quantum well structures - tuning the intersubband line shape by an electric field. Metzner, C., Steen, C., Hofmann, M., Hackenberg, M., & Döhler, G., H. Physica E: Low-Dimensional Systems and Nanostructures, 7(3-4):722-725, ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, 5, 2000. Paper Website abstract bibtex We theoretically investigate the disorder-induced localization of electrons and the broadening of intersubband (IS) absorption lines in asymmetric double-well (ADW) structures with three bound subbands. As a function of an electric field applied in growth direction, the two-peak IS spectrum of the system is calculated from realistic, in-plane localized single-particle states. The simultaneous monitoring of, both, intra- and inter-well transitions reveals the importance of spatial correlations for the inhomogenous line broadening effect. We generally find that the inter-well IS peak is considerably broader than the intra-well line. This can be traced back to a suppression of IS correlations in the case of a spatially indirect transition, where the initial and final subband probe different regions of the fluctuating potential landscape. At a certain electric field, however, the excited subbands form molecule-like states, spreading over both quantum wells, and the IS peaks take on comparable widths.
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title = {Interplay of disorder and tunneling in coupled quantum well structures - tuning the intersubband line shape by an electric field},
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abstract = {We theoretically investigate the disorder-induced localization of electrons and the broadening of intersubband (IS) absorption lines in asymmetric double-well (ADW) structures with three bound subbands. As a function of an electric field applied in growth direction, the two-peak IS spectrum of the system is calculated from realistic, in-plane localized single-particle states. The simultaneous monitoring of, both, intra- and inter-well transitions reveals the importance of spatial correlations for the inhomogenous line broadening effect. We generally find that the inter-well IS peak is considerably broader than the intra-well line. This can be traced back to a suppression of IS correlations in the case of a spatially indirect transition, where the initial and final subband probe different regions of the fluctuating potential landscape. At a certain electric field, however, the excited subbands form molecule-like states, spreading over both quantum wells, and the IS peaks take on comparable widths.},
bibtype = {article},
author = {Metzner, C. and Steen, C. and Hofmann, M. and Hackenberg, M. and Döhler, G.H H.},
journal = {Physica E: Low-Dimensional Systems and Nanostructures},
number = {3-4}
}
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