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

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

2003-06-17

arxiv.org/abs/cond-mat/0306424v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 (RevTex preprint) pages plus 3 (.JPG) figures. Full account of the last part of cond-mat/0210086. Draft in much better qual

Scientific paper

10.1103/PhysRevLett.91.057001

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.

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