The Aharonov-Bohm effect in graphene rings with metal mirrors

被引：9
|
作者：
Nam, Youngwoo [1 ]
Yoo, Jai Seung [1 ]
Park, Yung Woo [1 ]
Lindvall, Niclas [2 ]
Bauch, Thilo [2 ]
Yurgens, August [2 ]
机构：
[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea
[2] Chalmers Univ Technol, Dept Microtechnol & Nanosci, SE-41296 Gothenburg, Sweden
来源：
CARBON | 2012年 / 50卷 / 15期
基金：
瑞典研究理事会; 新加坡国家研究基金会;
关键词：
FERROMAGNETISM;
D O I：
10.1016/j.carbon.2012.08.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：5562 / 5568
页数：7
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