Aharonov-Bohm oscillations in p-type GaAs quantum rings

Details Aharonov-Bohm oscillations in p-type GaAs quantum rings Aharonov-Bohm oscillations in p-type GaAs quantum rings

2007-11-04

arxiv.org/abs/0711.0489v1

Physica E 40, 1273 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Proceedings of EP2DS-17, Genova 2007; Accepted for Physica E; 3 pages, 3 figures

Scientific paper

10.1016/j.physe.2007.08.129

We have explored phase coherent transport of holes in two p-type GaAs quantum rings with orbital radii 420 nm and 160 nm fabricated with AFM oxidation lithography. Highly visible Aharonov-Bohm (AB) oscillations are measured in both rings, with an amplitude of the oscillations exceeding 10% of the total resistance in the case of the ring with a radius of 160 nm. Beside the h/e oscillations, we resolve the contributions from higher harmonics of the AB oscillations. The observation of a local resistance minimum at B=0 T in both rings is a signature of the destructive interference of the holes' spins. We show that this minimum is related to the minimum in the h/2e oscillations.

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