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Quantum spin liquid with emergent chiral order in the triangular-lattice Hubbard model

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [4];  [5]
  1. Beihang University, Beijing (China); Ludwig Maximilian University of Munich, Munich (Germany)
  2. Beihang University, Beijing (China)
  3. California State University, Northridge (CSUN), CA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China); Beihang University, Beijing (China)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Ludwig Maximilian University of Munich, Munich (Germany)
+ Show Author Affiliations
The interplay between spin frustration and charge fluctuation gives rise to an exotic quantum state in the intermediate-interaction regime of the half-filled triangular-lattice Hubbard model, while the nature of the state is under debate. Using the density matrix renormalization group with SU(2)spinⓍU(1)charge symmetries implemented, we study the triangular-lattice Hubbard model defined on the long cylinder geometry up to circumference W=6. A gapped quantum spin liquid, with on-site interaction 9≲U/t≲10.75, is identified between the metallic and the antiferromagnetic Mott insulating phases. In particular, we find that this spin liquid develops a robust long-range spin scalar-chiral correlation as the system length L increases, which unambiguously unveils the spontaneous time-reversal symmetry breaking. In addition, the degeneracy of the entanglement spectrum supports symmetry fractionalization and spinon edge modes in the obtained ground state. The possible origin of chiral order in this intermediate spin liquid and its relation to the rotonlike excitations have also been discussed.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
German Research Foundation (DFG); National Natural Science Foundation of China (NSFC); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0012704
OSTI ID:
1886240
Report Number(s):
BNL-223340-2022-JAAM
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 9 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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