Year: 2018
Type: article
Abstract: We investigate the nature of doped Mott insulators using exact diagonalization and density matrix renormalization group methods. Persistent spin currents are revealed in the ground state, which are concomitant with a nonzero total momentum or angular momentum associated with the doped hole. The latter determines a nontrivial ground state degeneracy. By further making superpositions of the degenerate ground states with zero or unidirectional spin currents, we show that different patterns of spatial charge and spin modulations will emerge. Such anomaly persists for the odd numbers of holes, but the spin current, ground state degeneracy, and charge/spin modulations completely disappear for even numbers of holes, with the two-hole ground state exhibiting a $d$-wave symmetry. An understanding of the spin current due to a many-body Berry-like phase and its influence on the momentum distribution of the doped holes will be discussed.
Authors: Wayne Zheng, Zheng Zhu, D. N. Sheng, Zheng-Yu Weng
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: 铜氧化物掺杂莫特绝缘体的微观电子结构研究, NUMERICAL INVESTIGATIONS OF NOVEL CHARGE AND SPIN HALL EFFECTS IN GRAPHENE AND OTHER SPIN-ORBIT COUPLING ELECTRON SYSTEMS, G222768804, G2388045456, G5077499968, G5648016710, NUMERICAL INVESTIGATIONS OF NOVEL CHARGE AND SPIN HALL EFFECTS IN GRAPHENE AND OTHER SPIN ORBIT COUPLING ELECTRON SYSTEMS, G7913360457, G8626863207
OpenAlex ID: W2787220322