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Proceedings Paper

Shot noise in transport through quantum dots: ballistic versus diffractive scattering
Author(s): Stefan Rotter; Florian Aigner; Joachim Burgdörfer
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Paper Abstract

We investigate the shot noise in phase-coherent transport through quantum cavities by a two dimensional ab-initio simulation of the scattering problem. In particular, we study the influence of quantum scattering mechanisms on the transport statistics by tuning the strength of a disorder potential and the openings of the dot. For small cavity openings we find the shot noise for disordered samples to be of almost equal magnitude as for clean samples where transport is ballistic. We explain this finding by diffractive scattering at the cavity openings which act as strong noise sources. For ballistic cavities we demonstrate the emergence of "noiseless scattering states", irrespective of sharp-edged entrance and exit lead mouths. Our numerical results for the onset thresholds of these "classical" states are in very good agreement with analytical estimates.

Paper Details

Date Published: 8 June 2007
PDF: 9 pages
Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 660006 (8 June 2007); doi: 10.1117/12.725646
Show Author Affiliations
Stefan Rotter, Yale Univ. (United States)
Vienna Univ. of Technology (Austria)
Florian Aigner, Vienna Univ. of Technology (Austria)
Joachim Burgdörfer, Vienna Univ. of Technology (Austria)

Published in SPIE Proceedings Vol. 6600:
Noise and Fluctuations in Circuits, Devices, and Materials
Massimo Macucci; Lode K.J. Vandamme; Carmine Ciofi; Michael B. Weissman, Editor(s)

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