The Aharonov-Bohm effect in graphene rings with metal mirrors
Artikel i vetenskaplig tidskrift, 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

Författare

Youngwoo Nam

Seoul National University

J. S. Yoo

Seoul National University

YungWoo Park

Seoul National University

Niclas Lindvall

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Thilo Bauch

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Avgust Yurgens

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Carbon

0008-6223 (ISSN)

Vol. 50 5562-5568

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Materialteknik

Infrastruktur

Nanotekniklaboratoriet

DOI

10.1016/j.carbon.2012.08.004