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Parallel magnetic-field-induced conductance fluctuations in one- and two-subband ballistic quantum dots

C. Gustin, S. Faniel, B. Hackens, S. Melinte, M. Shayegan, and V. Bayot
Phys. Rev. B 68, 241305(R) – Published 18 December 2003
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Abstract

We report on conductance fluctuations of ballistic quantum dots in a strictly parallel magnetic field B. The quantum dots are patterned in two-dimensional electron gases (2DEG’s), confined to 15- and 45-nm-thick GaAs quantum wells (QW) with one and two occupied subbands at B=0, respectively. For both dots we observe universal conductance fluctuations (UCF’s) and, in the case of the wide QW dot, a reduction in their amplitude at large B. Our data suggest that the finite thickness of the 2DEG and the orbital effect are responsible for the parallel B-induced UCF’s.

  • Received 21 August 2003

DOI:https://doi.org/10.1103/PhysRevB.68.241305

©2003 American Physical Society

Authors & Affiliations

C. Gustin1, S. Faniel1, B. Hackens1, S. Melinte1, M. Shayegan2, and V. Bayot1

  • 1CERMIN, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium
  • 2Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA

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Vol. 68, Iss. 24 — 15 December 2003

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