Low-energy spectra of the t-J-type models studied by variational approach

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:310

Article; Proceedings Paper

Chou, Chung-Pin ; Lee, T. K. ; Ho, Chang-Ming

关键词: high Tc cuprates;    superconductivity;    excitation;    strong correlation;    t-J model;   

DOI  :  10.1016/j.jmmm.2006.10.550

来源: Elsevier

【 摘 要 】

We discuss recent progress in understanding the phenomena observed in high T-c cuprates by studying the d-wave resonating-valence-bond (d-RVB) based trial wave functions for the two-dimensional t-J-type models. Treating exactly the strong correlation between electrons by numerical approach, we examine the evolution of ground states described by different variational wave functions and properties of the quasi-hole and -particle excitations of the d-RVB superconducting (SC) state. Properties related to the Fermi surface geometry deduced from quasi-hole energy dispersion of the SC state is shown to be consistent with the observation by photoemission spectroscopy. With the calculated spectral weights (SWs) for adding and removing an electron, we found not only the anti-correlation between conductance peak height and width between peaks seen in tunneling experiments, but also unique properties due to strong correlation which need to be verified by future experiments. (c) 2006 Published by Elsevier B.V.

【 授权许可】

Free