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

G. Bohra; R. Somphonsane; N. Aoki; Y. Ochiai; R. Akis; D. K. Ferry; J. P. Bird

doi:10.1103/PhysRevB.86.161405

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

G. Bohra, R. Somphonsane, N. Aoki, Y. Ochiai, R. Akis, D. K. Ferry, J. P. Bird

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

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.

Original language	English (US)
Article number	161405
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.86.161405
State	Published - Oct 15 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.86.161405

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AU - Akis, R.

AU - Ferry, D. K.

AU - Bird, J. P.

PY - 2012/10/15

Y1 - 2012/10/15

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

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