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Extended states and dynamical localization in semiconductor superlattices

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Domínguez-Adame Acosta, Francisco and Sánchez, A. and Díez, E. (1997) Extended states and dynamical localization in semiconductor superlattices. Journal of Applied Physics, 81 (2). pp. 777-780. ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.364139


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Abstract

We study the quantum dynamics of electronic wave packets in quantum-well based semiconductor superlattices subject to an applied electric field. Using a high-accuracy numerical method, we analyze the dynamical behavior of electronic wave packets in periodic, random and random dimer superlattices. The spatial extent of electronic states is characterized by means of the time-dependent inverse participation ratio. We show that the delocalized states recently found in random dimer superlattices become spatially localized under the action of the applied field (dynamical localization) but wavepackets are much less localized than in purely random superlattices at moderate field. We conclude that the resonant tunneling effects causing delocalization in dimer superlattices play an important role even in the presence of moderate electric field.


Item Type:Article
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© 1997 American Institute of Physics.
This work has been supported by CICYT (Spain) under project MAT95-0325.

Uncontrolled Keywords:Bloch Oscillations
Subjects:Sciences > Physics > Materials
ID Code:27633
Deposited On:10 Dec 2014 11:46
Last Modified:10 Dec 2014 11:46

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