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

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题名:	Intermediate-coupling theory for the spectral weight of a spin polaron
作者:	Yang, M.-F.
贡献者:	Department of Physics, Tunghai University
日期:	1997
上传时间:	2013-05-14T09:06:17Z (UTC)
摘要:	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 k0=(±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.
關聯:	Physical Review B - Condensed Matter and Materials Physics Volume 55, Issue 1, 1 January 1997, Pages 56-58
显示于类别:	[應用物理學系所] 期刊論文

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