Theory of I-V characteristics for two-dimensional charge-ordered electron systems at quarter filling

Yasuhiro Tanaka, Kenji Yonemitsu

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The current-voltage characteristics and charge distribution of charge-ordered electron systems at quarter-filling under an applied bias voltage (V) are investigated theoretically by using nonequilibrium Green's functions. We consider an extended Hubbard model with long-range Coulomb interactions on a square lattice, which describes a checkerboard-type charge order in the absence of the bias V. The effects of metallic electrodes are incorporated into the self-energy. The electron density and a scalar potential that satisfies the Poisson equation with a suitable boundary condition are calculated self-consistently within the Hartree approximation. A first-order transition is observed from the charge-ordered insulating state to a conductive state with increasing V. In the former state, the charge distribution is almost unchanged by V, whereas the charge order disappears so that the charge distribution is basically uniform in the latter state.

本文言語English
ページ(範囲)S211-S213
ジャーナルPhysica B: Condensed Matter
405
11 SUPPL.
DOI
出版ステータスPublished - 2010 6 1
外部発表はい

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
  • 電子工学および電気工学

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