Phys. Rev. B 68, 241305(R) (2003) [4 pages]Parallel magnetic-field-induced conductance fluctuations in one- and two-subband ballistic quantum dots
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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.241305
DOI:
10.1103/PhysRevB.68.241305
PACS:
73.23.Ad, 73.63.Kv
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