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Gapless chiral spin liquid from coupled chains on the kagome lattice

Rodrigo G. Pereira, Samuel Bieri

SciPost Phys. 4, 004 (2018) · published 24 January 2018


Using a perturbative renormalization group approach, we show that the extended ($J_1$-$J_2$-$J_d$) Heisenberg model on the kagome lattice with a staggered chiral interaction ($J_\chi$) can exhibit a gapless chiral quantum spin liquid phase. Within a coupled-chains construction, this phase can be understood as a chiral sliding Luttinger liquid with algebraic decay of spin correlations along the chain directions. We calculate the low-energy properties of this gapless chiral spin liquid using the effective field theory and show that they are compatible with the predictions from parton mean-field theories with symmetry-protected line Fermi surfaces. These results may be relevant to the state observed in the kapellasite material.

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Chiral spin liquids Heisenberg model Kagomé lattices Kapellasite Parton mean-field theories Spin liquids Tomonaga-Luttinger liquids

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