High-energy magnon dispersion in the half-filled Hubbard model:: A comparison with La2CuO4 -: art. no. 144420

被引：14
|
作者：
Sengupta, P [1 ]
Scalettar, RT [1 ]
Singh, RRP [1 ]
机构：
[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 14期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevB.66.144420
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We use quantum Monte Carlo methods and the single-mode approximation to study the magnon dispersion in the two-dimensional (2D) half-filled Hubbard and phonon-coupled Heisenberg models. We find that in the Hubbard model with U/t<8, the high-energy magnon dispersion is similar to that observed in inelastic neutron scattering experiments in La2CuO4. On the other hand, our studies of a 2D Heisenberg model coupled to dynamic optical bond phonons fail to reproduce the experimental dispersion. These results can be interpreted as evidence of intermediate U/t and charge fluctuations in the cuprate materials.
引用
收藏
页码：1 / 5
页数：5
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