Abstract
A number of experiments on the hyperkagome iridate, , suggest existence of a gapless quantum spin liquid state at low temperature. Circumventing the slave-particle approach commonly used in theoretical analyses of frustrated magnets, we provide a more intuitive, albeit more phenomenological, construction of a quantum spin liquid state for the hyperkagome Heisenberg model. An effective monomer-dimer model on the hyperkagome lattice is proposed à la Hao and Tchernyshyov's approach cultivated from the Husimi cactus model. Employing an arrow representation for the monomer-dimer model, we obtain a compact gauge theory with a finite density of fermionic spinons on the hyperoctagon lattice. The resulting theory and its mean-field treatment are consistent with previous slave-particle construction of a quantum spin liquid state on the hyperkagome lattice. Our results offer novel insights into the emergence of spinon Fermi surfaces and useful predictions for future experiments.
1 More- Received 16 August 2016
- Revised 1 November 2016
DOI:https://doi.org/10.1103/PhysRevB.94.224401
©2016 American Physical Society