Ohmic and Step Noise from a Single Trapping Center Hybridized with a Fermi Sea

Rogerio de Sousa, K. Birgitta Whaley, Frank K. Wilhelm, and Jan von Delft
Phys. Rev. Lett. 95, 247006 – Published 8 December 2005

Abstract

We show that single electron tunneling devices such as the Cooper-pair box or double quantum dot can be sensitive to the zero-point fluctuation of a single trapping center hybridized with a Fermi sea. If the trap energy level is close to the Fermi sea and has linewidth γ>kBT, its noise spectrum has an Ohmic Johnson-Nyquist form, whereas for γ<kBT the noise has a Lorentzian form expected from the semiclassical limit. Trap levels above the Fermi level are shown to lead to steps in the noise spectrum that can be used to probe their energetics, allowing the identification of individual trapping centers coupled to the device.

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  • Received 6 April 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.247006

©2005 American Physical Society

Authors & Affiliations

Rogerio de Sousa1, K. Birgitta Whaley1, Frank K. Wilhelm2, and Jan von Delft2

  • 1Department of Chemistry and Pitzer Center for Theoretical Chemistry, University of California, Berkeley, California 94720-1460, USA
  • 2Department Physik, CeNS, and ASC, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 München, Germany

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Issue

Vol. 95, Iss. 24 — 9 December 2005

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