Low-energy spectra in the t-J type models at light doping

Abstract

Based on a variational approach, we propose that there are two kinds of low energy states in the t-J type models at low doping. In a quasi-particle state an unpaired spin bound to a hole with a well-defined momentum can be excited with spin waves. The resulting state shows a suppression of antiferromagnetic order around the hole with the profile of a {\em spin bag}. These spin-bag states with spin and charge or hole separated form a continuum of low-energy excitations. Very different properties predicted by these two kinds of states explain a number of anomalous results observed in the exact diagonalization studies on small clusters up to 32 sites.

11 (RevTex preprint) pages plus 3 (.JPG) figures. Full account of the last part of cond-mat/0210086. Draft in much better quality (large file) can be requested by contacting directly the authors. Submitted to Phys. Rev. Lett

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Cited by in corpus (10)

• New mean field theory of the tt't''J model applied to the high-Tc superconductors
• A Variational Monte Carlo Study of the Current Carried by a Quasiparticle
• Two-mode variational Monte Carlo study of Quasiparticle excitations in cuprates
• Spin dynamics in the antiferromagnetic phase for electron-doped cuprate superconductors
• Single-hole wave function in two dimensions: A case study of the doped Mott insulator
• Revisit of Antiferromagnetism in Hubbard Model by A Cluster Slave-Spin Method
• Crossover between local-moment magnetism and itinerant-electron magnetism in the t-J model
• Long-Range Coulomb Effect on the Antiferromagnetism in Electron-doped Cuprates
• Formation and local symmetry of Holstein polaron in t-J model
• The short-range correlations of a doped Mott insulator