Coexistence of Velocity Renormalization and Ferrimagnetic Fluctuation in the Organic Dirac Electron System α-(BEDT-TTF)2I3

被引：8
|
作者：
Matsuno, Genki [1 ]
Kobayashi, Akito [1 ]
机构：
[1] Nagoya Univ, Dept Phys, Nagoya, Aichi 4648602, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2018年 / 87卷 / 05期
关键词：
UNIAXIAL STRAIN; CONDUCTOR; PRESSURE; ALPHA-(ET)(2)I-3; ALPHA; SALT;
D O I：
10.7566/JPSJ.87.054706
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We evaluate the uniform spin susceptibility in an extended Hubbard model describing alpha-(BEDT-TTF)(2)I-3. Employing the Fock-type self-energy with the long-range Coulomb interaction and the random phase approximation with the on-site Coulomb interaction, it is clarified that the characteristic energy scales at which ferrimagnetic fluctuation and velocity renormalization emerge are different. This is why these phenomena coexist while the ferrimagnetic fluctuation is disturbed by the velocity renormalization. In addition, it is found that screening effect to the self-energy is irrelevant in the presence of a strong on-site Coulomb interaction U.
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页数：6
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