Becca F, Sorella S
Istituto Nazionale per la Fisica della Materia and International School for Advanced Studies, Via Beirut 4, 34013 Trieste, Italy.
Phys Rev Lett. 2001 Apr 9;86(15):3396-9. doi: 10.1103/PhysRevLett.86.3396.
We present different numerical calculations based on variational quantum Monte Carlo simulations supporting a ferromagnetic ground state for finite and small hole densities in the two-dimensional infinite-U Hubbard model. Moreover, by studying the energies of different total spin sectors, these calculations strongly suggest that the paramagnetic phase is unstable against a phase with a partial polarization for large hole densities delta approximately 0.40 with evidence for a second-order transition to the paramagnetic large doping phase.
我们基于变分量子蒙特卡罗模拟给出了不同的数值计算结果，这些结果支持二维无限U哈伯德模型中有限且小孔密度下的铁磁基态。此外，通过研究不同总自旋扇区的能量，这些计算结果有力地表明，对于大约0.40的大空穴密度δ，顺磁相对于部分极化相是不稳定的，有证据表明存在向顺磁大掺杂相的二级相变。
