Noise spectra of a biased quantum dot

E. A. Rothstein, O. Entin-Wohlman, and A. Aharony
Phys. Rev. B 79, 075307 – Published 9 February 2009

Abstract

The noise spectra associated with correlations of the current through a single level quantum dot, and with the charge fluctuations on the dot, are calculated for a finite bias voltage. The results turn out to be sensitive to the asymmetry of the dot’s coupling to the two leads. At zero temperature, both spectra exhibit two or four steps (as a function of the frequency), depending on whether the resonant level lies outside or within the range between the chemical potentials on the two leads. In addition, the low-frequency shot noise exhibits dips in the charge noise, and dips, peaks, and discontinuities in the derivative of the current noise. In spite of some smearing, several of these features persist at finite temperatures, where a peak can also turn into a dip.

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  • Received 6 December 2008

DOI:https://doi.org/10.1103/PhysRevB.79.075307

©2009 American Physical Society

Authors & Affiliations

E. A. Rothstein1,*, O. Entin-Wohlman2,3,†, and A. Aharony2,†

  • 1Department of Physics, Ben Gurion University, Beer Sheva 84105, Israel
  • 2Department of Physics and the Ilse Katz Center for Meso- and Nano-Scale Science and Technology, Ben Gurion University, Beer Sheva 84105, Israel
  • 3Albert Einstein Minerva Center for Theoretical Physics, Weizmann Institute of Science, Rehovot 76100, Israel

  • *rotshtei@bgu.ac.il
  • Also at Tel Aviv University.

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Issue

Vol. 79, Iss. 7 — 15 February 2009

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