Suppression of the Coulomb interaction contribution to the conductance by a parallel magnetic field

Details Suppression of the Coulomb interaction contribution to the conductance by a parallel magnetic field Suppression of the Coulomb interaction contribution to the conductance by a parallel magnetic field

1997-10-27

arxiv.org/abs/cond-mat/9710283v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

The Coulomb interaction contribution to the conductance is investigated in a phase-coherent disordered 2-dimensional electron gas, which resistance can be varied by an overall gate electrode. Its magnitude of dGeei=-0.3 e^2/h is obtained by applying a bias voltage to suppress the Coulomb anomaly. In contrast to theoretical predictions, dGeei is suppressed by a parallel magnetic field. The zero-bias magnetoresistance exhibits reproducible fluctuations in perpendicular magnetic fields on a field scale much larger than that expected for universal conductance fluctuations, which might be attributed to fluctuations in the Coulomb interaction contribution.

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