Determination of the complex microwave photoconductance of a single quantum dot

H. Qin, F. Simmel, R. H. Blick, J. P. Kotthaus, W. Wegscheider, and M. Bichler
Phys. Rev. B 63, 035320 – Published 2 January 2001
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Abstract

A small quantum dot containing approximately 20 electrons is realized in a two-dimensional electron system of an AlxGa1xAs/GaAs heterostructure. Conventional transport and microwave spectroscopy reveal the dot’s electronic structure. By applying a coherently coupled two-source technique, we are able to determine the complex microwave-induced tunnel current. The amplitude of this photoconductance resolves photon-assisted tunneling (PAT) in the nonlinear regime through the ground state and an excited state as well. The out-of-phase component (susceptance) allows us to study charge relaxation within the quantum dot on a time scale comparable to the microwave beat period.

  • Received 13 January 2000

DOI:https://doi.org/10.1103/PhysRevB.63.035320

©2001 American Physical Society

Authors & Affiliations

H. Qin1, F. Simmel1,*, R. H. Blick1, J. P. Kotthaus1, W. Wegscheider2,†, and M. Bichler2

  • 1Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
  • 2Walter-Schottky-Institut der Technischen Universität München, Am Coulombwall, 85748 München, Germany

  • *Present address: Bell Laboratories, Lucent Technologies, 600 Mountain Ave, Murray Hill, NJ 07974.
  • New address: Universität Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany.

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Vol. 63, Iss. 3 — 15 January 2001

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