Kink Structure in the Quasiparticle Band of Doped Hubbard Systems

Details Kink Structure in the Quasiparticle Band of Doped Hubbard Systems Kink Structure in the Quasiparticle Band of Doped Hubbard Systems

2005-07-25

arxiv.org/abs/cond-mat/0507564v1

Physics

Condensed Matter

Superconductivity

3 pages, 4 figures. to be published in J. Phys. Soc. Jpn., Vol. 74, No. 9, September 15, 2005

Scientific paper

10.1143/JPSJ.74.2397

By making use of the self-consistent projection operator method with high-momentum and high-energy resolutions, we find a kink structure in the quasiparticle excitation spectrum of the two-dimensional Hubbard model in the underdoped regime. The kink is caused by a mixing between the quasiparticle state and excitations with short-range antiferromagnetic order. We suggest that this might be the origin of the strong concentration dependence of the 'kink' found in La_{2-x}Sr_{x}CuO_{4} (x=0.03-0.07).

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