Abstract
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 language | English |
|---|---|
| Pages (from-to) | 56-58 |
| Number of pages | 3 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 55 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1997 |
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