Nonergodicity and microscopic symmetry breaking of the conductance fluctuations in disordered mesoscopic graphene

被引：31
作者：
Bohra, G. [1 ]
Somphonsane, R. [2 ]
Aoki, N. [3 ]
Ochiai, Y. [3 ]
Akis, R. [4 ]
Ferry, D. K. [3 ,4 ]
Bird, J. P. [1 ,3 ]
机构：
[1] SUNY Buffalo, Dept Elect Engn, Buffalo, NY 14260 USA
[2] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA
[3] Chiba Univ, Grad Sch Adv Integrat Sci, Inage Ku, Chiba 2638522, Japan
[4] Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ 85287 USA
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 16期
基金：
美国国家科学基金会;
关键词：
QUANTUM INTERFERENCE; 1/F NOISE; FIELD; COHERENCE; LOCALIZATION; SCATTERING; REDUCTION; PHASE; METAL;
D O I：
10.1103/PhysRevB.86.161405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We show a dramatic deviation from ergodicity for the conductance fluctuations in graphene. In marked contrast to the ergodicity of dirty metals, fluctuations generated by varying magnetic field are shown to be much smaller than those obtained when sweeping Fermi energy. They also exhibit a strongly anisotropic response to the symmetry-breaking effects of a magnetic field, when applied perpendicular or parallel to the graphene plane. These results reveal a complex picture of quantum interference in graphene, whose description appears more challenging than for conventional mesoscopic systems.
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页数：5
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