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Low-energy spectra in t-J-type models at low doping levels | | Wei-Cheng Lee
; T K Lee
; Chang-Ming Ho
; P W Leung
; | | Date: |
1 Aug 2003 | | Journal: | Phys Rev Lett, 91 (5), 057001 | | 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 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. | | Source: | PubMed, pmid12906623 | | Services: | Forum | Review | Favorites | |
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