Observation of Aharonov-Bohm conductance oscillations in a graphene ring

By Saverio Russo, J. Oostinga, D. Wehenkel, H. Heersche, S. Sobhani, Lieven M. K. Vandersypen, A. Morpurgo. 2007

207 citations recorded by the source corpus.

We investigate experimentally transport through ring-shaped devices etched in graphene and observe clear Aharonov-Bohm conductance oscillations. The temperature dependence of the oscillation amplitude indicates that below 1 K, the phase coherence length is comparable to or larger than the size of the ring. An increase in the amplitude is observed at high magnetic field, when the cyclotron diameter becomes comparable to the width of the arms of the ring. By measuring the dependence on gate voltage, we find that the Aharonov-Bohm effect vanishes at the charge neutrality point, and we observe an unexpected linear dependence of the oscillation amplitude on the ring conductance.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/2b25647c8704c7e87df5517b9506cbaee9d70d6e

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In Atomic and Molecular Physics, and Optics

1. Franco Nori
2. Y. Bliokh
3. V. Freilikher
4. G. Giavaras
5. A. Rozhkov
6. Sahel Ashhab
7. K. Bliokh
8. I. Georgescu

In Electrical and Electronic Engineering

1. G. Giavaras
2. Franco Nori
3. Y. Bliokh
4. V. Freilikher
5. A. Rozhkov

In Materials Chemistry

1. G. Giavaras
2. Franco Nori
3. Y. Bliokh
4. V. Freilikher
5. A. Rozhkov

Citations in the corpus

• Electronic properties of mesoscopic graphene structures: Charge confinement and control of spin and charge transport (2011, background): “In a graphene ring device, conductance oscillations versus magnetic field were reported as a consequence of the Aharonov–Bohm effect [164] (Fig.”