Doped Mott insulators in the triangular-lattice Hubbard model

Zhu, Zheng; Sheng, D. N.; Vishwanath, Ashvin

doi:10.1103/physrevb.105.205110

Title: Doped Mott insulators in the triangular-lattice Hubbard model

Journal Article · Tue May 10 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.205110· OSTI ID:1979761

^[1]; Sheng, D. N. ^[2]; Vishwanath, Ashvin ^[3]

Harvard University, Cambridge, MA (United States); Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing China)
California State University, Northridge (CSUN), CA (United States)
Harvard University, Cambridge, MA (United States)

Here we investigate the evolution of the Mott insulators in the triangular lattice Hubbard Model, as a function of hole doping δ in both the strong and intermediate coupling limits. Using the advanced density matrix renormalization group (DMRG) method, at light hole doping δ ≲ 10%, we find a significant difference between strong and intermediate couplings. Notably, at intermediate coupling an unusual metallic state emerges, with short ranged spin correlations but long ranged spin-chirality order. Moreover, no clear Fermi surface or wave vector is observed, this chiral metal also exhibits staggered loop current, which breaks the translational symmetry. These features disappear on increasing interaction strength or on further doping. At strong coupling, the 120 degree magnetic order of the insulating magnet persists for light doping, and produces hole pockets with a well-defined Fermi surface. On further doping, δ ≈ 10%~20% SDW order and coherent hole Fermi pockets are found at both strong and intermediate couplings. At even higher doping δ ≳ 20%, the SDW order is suppressed and the spin-singlet Cooper pair correlations are simultaneously enhanced. We also briefly comment on the strong particle-hole asymmetry of the model.

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Research Organization:: California State Univ. (CalState), Long Beach, CA (United States); California State University, Northridge (CSUN), CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Central Universities; Chinese Academy of Sciences; Simons Foundation

Grant/Contract Number:: FG02-06ER46305; 12074375; E0EG4303X2; 118900M026; XDB33000000

OSTI ID:: 1979761

Alternate ID(s):: OSTI ID: 2203492

Journal Information:: Physical Review. B, Vol. 105, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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