Anomalous orbital magnetism in Dirac-electron systems: Role of pseudo-spin paramagnetism

Details Anomalous orbital magnetism in Dirac-electron systems: Role of pseudo-spin paramagnetism Anomalous orbital magnetism in Dirac-electron systems: Role of pseudo-spin paramagnetism

2010-03-02

arxiv.org/abs/1003.0499v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

The orbital diamagnetic susceptibility is calculated in monolayer and bilayer graphenes with band gap as well as in three-dimensional Dirac systems. It is demonstrated that the pseudo-spin degree of freedom such as valleys produces paramagnetic susceptibility in an equal manner as the real spin dominating over the Landau diamagnetism. The pseudo-spin paramagnetism explains the origin of a singular diamagnetism which is present only in the band-gap region and disappears rapidly inside the conduction and valence bands.

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