Competition among various charge-inhomogeneous states and d-wave superconducting state in Hubbard models on square lattices
Competition among various charge-inhomogeneous states and d-wave superconducting state in Hubbard models on square lattices
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DOI：
10.1103/physrevb.97.045138
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发表时间：
2018-01-22
影响因子：
3.7
通讯作者：
Imada, Masatoshi
中科院分区：
文献类型：
--
作者：
Ido, Kota;Ohgoe, Takahiro;Imada, Masatoshi
利用变分蒙特卡罗方法研究了二维Hubbard模型中电荷均匀态和非均匀态之间的竞争。在铜氧化物超导体的实际参数下，从排斥库仑相互作用产生的载流子的紧急有效吸引导致电荷/自旋条纹基态，其在10 K的能量标度下与铜氧化物的均匀超导激发态严重竞争。条纹周期随着空穴掺杂δ的减小而增加，这与La基铜氧化物在δ = 1/8时的实验结果一致。对于较低的Delta，我们发现相分离。紧急吸引铜酸盐的影响进行了讨论。
We study competitions among charge-uniform and -inhomogeneous states in two-dimensional Hubbard models by using a variational Monte Carlo method. At realistic parameters for cuprate superconductors, emergent effective attraction of carriers generated from repulsive Coulomb interaction leads to charge/spin stripe ground states, which severely compete with uniform superconducting excited states in the energy scale of 10 K for cuprates. Stripe period increases with decreasing hole doping delta, which agrees with the experiments for La-based cuprates at delta = 1/8. For lower delta, we find a phase separation. Implications of the emergent attraction for cuprates are discussed.