The Aharonov-Bohm effect in graphene rings with metal mirrors
| Autor: | Youngwoo Nam, Jai Seung Yoo, Yung Woo Park, August Yurgens, Thilo Bauch, Niclas Lindvall |
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| Rok vydání: | 2012 |
| Předmět: |
Superconductivity
Materials science Condensed matter physics Graphene Coulomb blockade Fermi energy General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention symbols.namesake Ferromagnetism law Physics::Atomic and Molecular Clusters symbols General Materials Science Aharonov–Bohm effect Bilayer graphene Graphene nanoribbons |
| Zdroj: | Carbon. 50:5562-5568 |
| ISSN: | 0008-6223 |
| Popis: | We measured the Aharonov-Bohm (AB) effect in graphene rings with superconducting-(Al) and normal-metal (Au) mirrors. The mirrors were deposited either on additional stubs connected to the rings in the transverse direction or on the ring bias lines. A significant enhancement of the visible phase coherence was observed in the latter case, in which we observed even the third harmonic of the AB oscillations. The superconductivity of the mirrors appears to be unimportant for the improved coherence in graphene. A large Fermi energy mismatch between graphene and the mirror material is sufficient for this effect. In addition, a transport gap was observed in our graphene structures at the gate voltage close to the Dirac point. The value of the gap can be reproduced by assuming the occurrence of Coulomb blockade effects in graphene. |
| Databáze: | OpenAIRE |
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