Intersubband transitions of a quasi-two-dimensional electron gas in the strong disorder regime. Metzner, C., Hofmann, M., & Döhler, G., H. Physical Review B, 58(11):7188-7196, AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA, 9, 1998.
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Paper Website abstract bibtex In modulation δ-doped quantum wells with thin spacer layers the electrons are localized by strong doping-induced potential fluctuations. We analyze in detail the corresponding single-particle wave functions by a direct numerical solution of the multisubband quasi-two-dimensional Schrödinger equation and calculate the intersubband absorption spectra. Although the disorder-induced broadening of the density of states is strong, we only find a small linewidth for the intersubband transitions in the case of thin quantum wells. This behavior can be traced back to a strong spatial correlation between the states associated with the ground and first excited subband of the undisturbed system. For thicker wells the subband mixing increases and a gradual, asymmetric broadening of the absorption peak is found. These results are compared to a simple, semiclassical approximation. It is demonstrated that the correlation between energetically separated quantum states is one of the key effects of the intersubband excitation process, which is also relevant for other fields dealing with strongly disordered multisubband systems.
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abstract = {In modulation δ-doped quantum wells with thin spacer layers the electrons are localized by strong doping-induced potential fluctuations. We analyze in detail the corresponding single-particle wave functions by a direct numerical solution of the multisubband quasi-two-dimensional Schrödinger equation and calculate the intersubband absorption spectra. Although the disorder-induced broadening of the density of states is strong, we only find a small linewidth for the intersubband transitions in the case of thin quantum wells. This behavior can be traced back to a strong spatial correlation between the states associated with the ground and first excited subband of the undisturbed system. For thicker wells the subband mixing increases and a gradual, asymmetric broadening of the absorption peak is found. These results are compared to a simple, semiclassical approximation. It is demonstrated that the correlation between energetically separated quantum states is one of the key effects of the intersubband excitation process, which is also relevant for other fields dealing with strongly disordered multisubband systems.},
bibtype = {article},
author = {Metzner, C. and Hofmann, M. and Döhler, G. H.},
journal = {Physical Review B},
number = {11}
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