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Paper detail

Aharonov-Bohm effect in a side-gated graphene ring

We investigate the magnetoresistance of a side-gated ring structure etched out of single-layer graphene. We observe Aharonov-Bohm oscillations with about 5% visibility. We are able to change the relative phases of the wave functions in the interfering paths and induce phase jumps of pi in the Aharonov-Bohm oscillations by changing the voltage applied to the side gate or the back gate. The observed data can be well interpreted within existing models for 'dirty metals' giving a phase coherence length of the order of 1 micrometer at a temperature of 500mK.

preprint2009arXivOpen access
Magdalena HuefnerFrançoise MolitorArnhild JacobsenAlessandro PiodaChristoph StampferKlaus EnsslinThomas Ihn
cond-mat.mes-hall
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Magdalena HuefnerFrançoise MolitorArnhild JacobsenAlessandro PiodaChristoph StampferKlaus EnsslinThomas Ihn

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