Kavli Affiliate: Leon Balents
| First 5 Authors: Zhenhao Song, Urban F. P. Seifert, Leon Balents, Hong-Chen Jiang,
| Summary:
Motivated by twisted transition metal dichalcogenides (TMDs), we study an
extended Hubbard model with both on-site and off-site repulsive interactions,
in which Mott insulating states with concomitant charge order occur at
fractional fillings. To resolve the charge ordering as well as the fate of the
local moments formed thereby, we perform large-scale density matrix
renormalization group calculations on cylindrical geometries for several
filling fractions and ranges of interaction strength. Depending on the precise
parameter regime, both antiferromagnetically ordered as well as
quantum-disordered states are found, with a particularly prominent example
being a quantum spin liquid-type ground state on top of charge-ordering with
effective Kagom’e geometry. We discuss the different mechanisms at play in
stabilizing various electronic and magnetic states. The results suggest that
moir’e TMDs are a promising venue for emergent quantum magnetism of strongly
interacting electrons.
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