Quantum blockade and loop currents in graphene with topological defects

Yanyang Zhang; Jiang Ping Hu; B. A. Bernevig; X. R. Wang; X. C. Xie; W. M. Liu

doi:10.1103/PhysRevB.78.155413

Quantum blockade and loop currents in graphene with topological defects

Yanyang Zhang, Jiang Ping Hu, B. A. Bernevig, X. R. Wang, X. C. Xie, W. M. Liu

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Abstract

We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The chirality depends on the direction of the applied bias voltage and the sign of the local curvature created by the topological defects. This quantum localization phenomenon provides a way to generate a magnetic moment by an external electric field, which can prove useful in nanotronics.

Original language	English (US)
Article number	155413
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	78
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.78.155413
State	Published - Oct 9 2008

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.78.155413

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title = "Quantum blockade and loop currents in graphene with topological defects",

abstract = "We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The chirality depends on the direction of the applied bias voltage and the sign of the local curvature created by the topological defects. This quantum localization phenomenon provides a way to generate a magnetic moment by an external electric field, which can prove useful in nanotronics.",

author = "Yanyang Zhang and Hu, {Jiang Ping} and Bernevig, {B. A.} and Wang, {X. R.} and Xie, {X. C.} and Liu, {W. M.}",

note = "Funding Information: The authors acknowledge National Measurement System funding support through the UK Department for Business, Energy and Industrial Strategy and the valuable advice provided by Dr. Volker Wilkens in discussing the origin of the absorber criteria given in IEC 61161.",

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AU - Bernevig, B. A.

AU - Wang, X. R.

AU - Xie, X. C.

AU - Liu, W. M.

N1 - Funding Information: The authors acknowledge National Measurement System funding support through the UK Department for Business, Energy and Industrial Strategy and the valuable advice provided by Dr. Volker Wilkens in discussing the origin of the absorber criteria given in IEC 61161.

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N2 - We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The chirality depends on the direction of the applied bias voltage and the sign of the local curvature created by the topological defects. This quantum localization phenomenon provides a way to generate a magnetic moment by an external electric field, which can prove useful in nanotronics.

AB - We investigate the effect of topological defects on the transport properties of a narrow ballistic ribbon of graphene with zigzag edges. Our results show that the longitudinal conductance vanishes at several discrete Fermi energies where the system develops loop orbital electric currents with certain chirality. The chirality depends on the direction of the applied bias voltage and the sign of the local curvature created by the topological defects. This quantum localization phenomenon provides a way to generate a magnetic moment by an external electric field, which can prove useful in nanotronics.

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Quantum blockade and loop currents in graphene with topological defects

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