2018/02/28 by Wayne Zheng, Zheng Zhu, D. N. Sheng +1 · 21 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Condensed matter physics #Degeneracy (biology) #Degenerate energy levels #Density matrix renormalization group #Ground state #Hubbard model #Iron-based superconductors research #Mott insulator #Physics #Physics of Superconductivity and Magnetism #Quantum electrodynamics #Quantum mechanics #Renormalization group #Spin (aerodynamics) #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.98.165102
published in Physical review. B./Physical review. B 98(16) (American Physical Society) · 9 pages, 9 figures, update second version including more data and discussion added
arxiv created 2018/06/27 · openalex publication_date 2018/10/02 · arxiv updated 2018/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.