Orbital magnetic susceptibility of finite-sized graphene

Yuya Ominato, Mikito Koshino

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We study the orbital magnetism of graphene ribbon in the effective-mass approximation, to figure out the finite-size effect on the singular susceptibility known in the bulk limit. We find that the susceptibility at T=0 oscillates between diamagnetism and paramagnetism as a function of F, in accordance with the subband structure formed by quantum confinement. In increasing T, the oscillation rapidly disappears once the thermal broadening energy exceeds the subband spacing, and the susceptibility χ( F) approaches the bulk limit, i.e., a thermally broadened diamagnetic peak centered at F=0. The electric current supporting the diamagnetism is found to flow near the edge with a depth ∼v/(2πk BT), with v being the band velocity, while at T=0 the current distribution spreads entirely in the sample reflecting the absence of the characteristic wavelength in graphene. The result is applied to estimate the three-dimensional random-stacked multilayer graphene, where we show that the external magnetic field is significantly screened inside the sample in low temperatures, in a much stronger manner than in graphite.

本文言語English
論文番号165454
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
85
16
DOI
出版ステータスPublished - 2012 4月 30

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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