The Aharonov-Bohm effect in graphene rings with metal mirrors
Journal article, 2012

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.

ferromagnetism

transport

Author

Youngwoo Nam

Seoul National University

J. S. Yoo

Seoul National University

YungWoo Park

Seoul National University

Niclas Lindvall

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Avgust Yurgens

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Carbon

0008-6223 (ISSN)

Vol. 50 15 5562-5568

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Materials Engineering

Infrastructure

Nanofabrication Laboratory

DOI

10.1016/j.carbon.2012.08.004

More information

Created

10/7/2017