Ma Tianxing, Zhang Lufeng, Chang Chia-Chen, Hung Hsiang-Hsuan, Scalettar Richard T
Department of Physics, Beijing Normal University, Beijing 100875, China.
Beijing Computational Science Research Center, Beijing 100193, China.
Phys Rev Lett. 2018 Mar 16;120(11):116601. doi: 10.1103/PhysRevLett.120.116601.
Using exact quantum Monte Carlo calculations, we examine the interplay between localization of electronic states driven by many-body correlations and that by randomness in a two-dimensional system featuring linearly vanishing density of states at the Fermi level. A novel disorder-induced nonmagnetic insulating phase is found to emerge from the zero-temperature quantum critical point separating a semimetal and a Mott insulator. Within this phase, a phase transition from a gapless Anderson-like insulator to a gapped Mott-like insulator is identified. Implications of the phase diagram are also discussed.
通过精确的量子蒙特卡罗计算，我们研究了在费米能级处态密度线性消失的二维系统中，多体关联驱动的电子态局域化与无序驱动的电子态局域化之间的相互作用。我们发现，一个新型的无序诱导非磁性绝缘相从将半金属和莫特绝缘体分开的零温度量子临界点出现。在这个相中，确定了从无隙安德森类绝缘体到有隙莫特类绝缘体的相变。我们还讨论了相图的含义。
