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Fluctuations in the transmission properties of a quantum dot with interface roughness and impurities

Kirby, S. K. and Ting, D. Z.-Y. and McGill, T. C. (1994) Fluctuations in the transmission properties of a quantum dot with interface roughness and impurities. Semiconductor Science and Technology, 9 (5S). pp. 918-921. ISSN 0268-1242. doi:10.1088/0268-1242/9/5S/139.

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We examine statistical fluctuations in the transmission properties of quantum dots with interface roughness and neutral impurities. For this purpose we employ a supercell model of quantum transport capable of simulating potential variations in three dimensions. We find that sample to sample variations in interface roughness in a quantum dot waveguide can lead to substantial fluctuations in the n=1 transmission resonance position, width and maximum. We also find that a strongly attractive impurity near the centre of a quantum dot can reduce these fluctuations. Nevertheless, the presence of more than a single impurity can give rise to a complex resonance structure that varies with impurity configuration.

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Additional Information:© Institute of Physics 1994. HOT CARRIERS IN SEMICONDUCTORSPROCEEDINGS OF THE 8TH INTERNATIONAL CONFERENCE (HCIS-8) (OXFORD, 16-20 AUGUST 1993) SECTION 12. TRANSPORT IN QUANTUM STRUCTURES The authors would like to thank Dr Eric F Van de Velde for helpful discussion. S K Kirby would like to thank the Office of Naval Research (ONR) for graduate fellowship support during this work. This work was also supported by the Office of Naval Research under grant no N00014-89-J-1141.
Issue or Number:5S
Record Number:CaltechAUTHORS:KIRsst94
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ID Code:1719
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Deposited On:13 Feb 2006
Last Modified:08 Nov 2021 19:41

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