A Neck-Collapsing-Type Lifshitz Transition Induced by Orbital Symmetry Breaking in Lightly Hole Doped $t_{2g}$ Bands
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概要
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We report on a new type of orbital symmetry breaking in the CoO2 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 $e'_{g}$ 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 $e'_{g}$ orbitals.
- 2009-06-15
著者
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Takubo Kou
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Mizokawa Takashi
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Wakisaka Yuki
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Hirata Sizuka
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Ikedo Kazumichi
Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo
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Wakisaka Yuki
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561
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Hirata Sizuka
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561
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Ikedo Kazumichi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561
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Takubo Kou
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561
-
Mizokawa Takashi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561
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Wakisaka Yuki
Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
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