t-t′-J-U模型中电子次近邻跃迁对Gossamer超导的影响

Effect of additional second neighbor hopping on Gossamer superconductivity in the t-t′-J-U model

基于重整化平均场理论,在二维空穴掺杂t-t′-J-U模型的框架下,用Gutzwiller平均场近似理论研究高温超导体的基态相图,分析了次近邻跃迁电子(t′)对电子平均双重占据数(d)的影响。发现在掺杂浓度δ≠0的掺杂Gossamer超导态,次近邻跃迁的引入使d的数值在欠掺杂浓度区增大,在过掺杂浓度区显著减少。

The effect of additional second-neighbor hopping （t＇） on double occupation electrons （d） of superconductors was investigated with a renormalized mean field theory based on the Gutzwiller variational approach in the two dimensions hole-doped t-t＇-J-U model. For the δ≠0 Gossamer superconductors, the d is slightly enhanced by t＇ in underdoped regions and greatly suppressed in overdoped regions.