Electron dynamics in intentionally disordered semiconductor superlattices



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Díez, E. and Sánchez, Angel and Domínguez-Adame Acosta, Francisco and Berman, Gennady P. (1996) Electron dynamics in intentionally disordered semiconductor superlattices. Physical Review B, 54 (20). pp. 14550-14559. ISSN 0163-1829

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Official URL: http://dx.doi.org/10.1103/PhysRevB.54.14550


We study the dynamical behavior of disordered quantum well-based semiconductor superlattices where the disorder is intentional and short-range correlated. We show that, whereas the transmission time of a particle grows exponentially with the number of wells in an usual disordered superlattice for any value of the incident particle energy, for specific values of the incident energy this time increases linearly when correlated disorder is included. As expected, those values of the energy coincide with a narrow subband of extended states predicted by the static calculations of Dominguez-Adame et al. [Phys. Rev. B 51, 14 359 (1994)]; such states are seen in our dynamical results to exhibit a ballistic regime, very close to the WKB approximation of a perfect superlattice. Fourier transform of the output signal for an incident Gaussian wave packet reveals a dramatic filtering of the original signal, which makes us confident that devices based on this property may be designed and used for nanotechnological applications. This is more so in view of the possibility of controlling the output band using a de-electric field, which we also discuss. In the conclusion we summarize our results and present an outlook for future developments arising from this work.

Item Type:Article
Additional Information:

© 1996 The American Physical Society.
Work at Leganés and Madrid is supported by the Comisión Interministerial de Ciencia y Tecnologí a (CICyT, Spain) under Grant No. MAT95-0325. G. P. B. gratefully acknowledges partial support from Linkage Grant No. 93-1602 from NATO Special Programme Panel on Nanotechnology.

Uncontrolled Keywords:Bloch Oscillations, Times
Subjects:Sciences > Physics > Materials
ID Code:27671
Deposited On:11 Dec 2014 15:23
Last Modified:11 Dec 2014 15:23

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