Low-energy spectra in t-J-type models at low doping levels

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 quasiparticle 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 antiferrom...

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Bibliographic Details
Published inPhysical review letters Vol. 91; no. 5; p. 057001
Main Authors Lee, Wei-Cheng, Lee, T K, Ho, Chang-Ming, Leung, P W
Format Journal Article
LanguageEnglish
Published United States 01.08.2003
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Summary: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 quasiparticle 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 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.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.91.057001