Weak localization and conductance fluctuations of a chaotic quantum dot with tunable spin-orbit coupling

Details Weak localization and conductance fluctuations of a chaotic quantum dot with tunable spin-orbit coupling Weak localization and conductance fluctuations of a chaotic quantum dot with tunable spin-orbit coupling

2001-05-10

arxiv.org/abs/cond-mat/0105222v3

Phys. Rev. B 65, 081302 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, RevTeX; 2 figures. Substantial revisions

Scientific paper

10.1103/PhysRevB.65.081302

In a two-dimensional quantum dot in a GaAs heterostructure, the spin-orbit scattering rate is substantially reduced below the rate in a bulk two-dimensional electron gas [B.I. Halperin et al, Phys. Rev. Lett. 86, 2106 (2001)]. Such a reduction can be undone if the spin-orbit coupling parameters acquire a spatial dependence, which can be achieved, e.g., by a metal gate covering only a part of the quantum dot. We calculate the effect of such spatially non-uniform spin-orbit scattering on the weak localization correction and the universal conductance fluctuations of a chaotic quantum dot coupled to electron reservoirs by ballistic point contacts, in the presence of a magnetic field parallel to the plane of the quantum dot.

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