DYNAMIC PAIR SUSCEPTIBILITIES IN THE T-J AND HUBBARD MODELS

被引:72
作者
DAGOTTO, E [1 ]
RIERA, J [1 ]
YOUNG, AP [1 ]
机构
[1] UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064
来源
PHYSICAL REVIEW B | 1990年 / 42卷 / 04期
关键词
D O I
10.1103/PhysRevB.42.2347
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study dynamical properties of two holes in the t-J, t-Jz, and Hubbard models using exact diagonalization techniques on small clusters. For the three models we found that the ground state of two holes has d-wave symmetry. Studying the dynamical d-wave pairing susceptibility at zero momentum, we observed a quasiparticle-like peak at the bottom of the spectrum in a broad region of parameter space. The lowest-energy p-wave state is close in energy to the d-wave ground state, and they both behave qualitatively similarly, while the lowest-energy states of the s-wave and extended-s-wave subspaces have higher energies and present no quasiparticle peak. The ground-state energy of two holes in the t-J model scales with J as a power law. Binding energies for different symmetries as well as dynamical properties for nonzero momentum are also discussed. © 1990 The American Physical Society.
引用
收藏
页码:2347 / 2352
页数:6
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