Intermediate-Coupling Theory for the Spectral Weight of Spin Polaron

Details Intermediate-Coupling Theory for the Spectral Weight of Spin Polaron Intermediate-Coupling Theory for the Spectral Weight of Spin Polaron

1996-07-29

arxiv.org/abs/cond-mat/9607204v1

Phys. Rev. B 55, 56 (1997)

Physics

Condensed Matter

4 pages, RevTeX, 2 PS figures

Scientific paper

10.1103/PhysRevB.55.56

Within the intermediate-coupling theory, the quasiparticle weight $Z$ of one hole injected in the undoped antiferromagnetic ground state is studied. We find that, for the hole located at the quasiparticle band minimun with momentum ${\bf k}_0 = (\pm \frac{\pi}{2}, \pm \frac{\pi}{2})$, $Z$ 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 $J/t \stackrel{>}{\sim} 1.6$. Finally, the reason why this approach fails in the small-$J$ case will also be clarified.

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