A neck-collapsing-type lifshitz transition induced by orbital symmetry breaking in lightly hole doped t 2g bands

Kazumichi Ikedo*, Yuki Wakisaka, Sizuka Hirata, Kou Takubo, Takashi Mizokawa

*この研究の対応する著者

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We report on a new type of orbital symmetry breaking in the CoO 2 triangular lattice with hole doped t 2g bands. Unrestricted Hartree-Fock calculations on a multi-orbital d-p Hamiltonian show that, in the lightly hole doped t 2g bands, the é g orbitals are fully occupied with a circular charge distribution, and the doped holes in the a 1g band form a hole pocket sandwiched by two concentric Fermi surfaces with sixfold (and almost continuous) rotational symmetry. This symmetric state has an instability to an anisotropic state with twofold rotational symmetry, where the hole pocket is split into two pieces. This transition is governed by the anisotropic interaction between the a 1g and é g orbitals.

本文言語English
論文番号063707
ジャーナルjournal of the physical society of japan
78
6
DOI
出版ステータスPublished - 2009 6
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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