Intermediate-coupling theory for the spectral weight of a spin polaron

Min Fong Yang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

4 Scopus citations


Within the intermediate-coupling theory, the quasiparticle weight Z of one hole injected into the undoped antiferromagnetic ground state is studied. We find that, for the hole located at the quasiparticle band minimum with momentum (Formula presented)=(±π/2,±π/2), Z is finite. By comparing the results obtained by the self-consistent Born approximation, we show that the intermediate-coupling theory for Z is appropriate only when J/t≳1.6. Finally, the reason why this approach fails in the small-J case will also be clarified.

Original languageEnglish
Pages (from-to)56-58
Number of pages3
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
StatePublished - 1997


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