Quasiparticle dispersion of the 2D Hubbard model: From an insulator to a metal.
Quasiparticle dispersion of the 2D Hubbard model: From an insulator to a metal.
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DOI：
10.1103/physrevlett.75.1344
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发表时间：
1994-12
影响因子：
8.6
通讯作者：
Preuss;Hanke;von der Linden W
中科院分区：
文献类型：
--
作者：
Preuss;Hanke;von der Linden W
在量子蒙特卡罗结果的基础上，研究了二维Hubbard模型的谱权A（\vec k，\omega）$从绝缘到金属行为的演化.在最近的光电子能谱实验中观察到的cuprates，电子激发显示基本上掺杂独立的功能：一个准粒子状的色散窄带的宽度的顺序的交换相互作用$J$和广泛的价带和导带背景。这种连续的演化可以追溯到同一个多体起源：依赖于掺杂的反铁磁自旋-自旋关联。
On the basis of Quantum-Monte-Carlo results the evolution of the spectral weight $A(\vec k, \omega)$ of the two-dimensional Hubbard model is studied from insulating to metallic behavior. As observed in recent photoemission experiments for cuprates, the electronic excitations display essentially doping-independent features: a quasiparticle-like dispersive narrow band of width of the order of the exchange interaction $J$ and a broad valence- and conduction-band background. The continuous evolution is traced back to one and the same many-body origin: the doping-dependent antiferromagnetic spin-spin correlation.