Roles of zeros of the Green function in Fermi arc and non-Fermi liquid in the two-dimensional Hubbard model |
| |
Authors: | Shiro Sakai Yukitoshi Motome Masatoshi Imada |
| |
Institution: | Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan |
| |
Abstract: | We clarify effects of zeros of the Green function on a Fermi arc and on a non-Fermi liquid behavior in the two-dimensional Hubbard model by means of the cellular dynamical mean-field theory (CDMFT). We study in detail the state with a hole-pocket Fermi surface and zeros of the Green function, which was found for a slightly doped Mott insulator in an earlier CDMFT calculation T.D. Stanescu, G. Kotliar, Phys. Rev. B 74 (2006) 125110; T.D. Stanescu, M. Civelli, K. Haule, G. Kotliar, Ann. Phys. (N.Y.) 321 (2006) 1682]. As thermal or other extrinsic scatterings of electrons broaden the zeros, regions around the zero surface gain an imaginary part of the self-energy, which strongly suppresses the spectral intensity, especially on the closer side of the hole pocket to the zero surface. Then the rest emerges as a Fermi arc. Quasiparticle weight becomes ill defined on the closer side of the Fermi pocket while it is well defined on the opposite side, which means that a differentiation of electrons occurs in the momentum space, indicating an emergence of a non-Fermi liquid phase. |
| |
Keywords: | Fermi arc Zeros of the Green function Cluster dynamical mean-field theory |
本文献已被 ScienceDirect 等数据库收录! |
|