Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice

Serbyn M, Senthil T, Lee P. 2011. Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 84(18).


Journal Article | Published
Author
Serbyn, MaksymIST Austria ; Senthil, Todadri S; Lee, Patrick
Abstract
Motivated by recent experiments on the material Ba3NiSb 2O9, we consider a spin-one quantum antiferromagnet on a triangular lattice with the Heisenberg bilinear and biquadratic exchange interactions and a single-ion anisotropy. Using a fermionic "triplon" representation for spins, we study the phase diagram within mean-field theory. In addition to a fully gapped spin-liquid ground state, we find a state where one gapless triplon mode with a Fermi surface coexists with d+id topological pairing of the other triplons. Despite the existence of a Fermi surface, this ground state has fully gapped bulk spin excitations. Such a state has linear in-temperature specific heat and constant in-plane spin susceptibility, with an unusually high Wilson ratio.
Publishing Year
Date Published
2011-11-03
Journal Title
Physical Review B - Condensed Matter and Materials Physics
Volume
84
Issue
18
IST-REx-ID
967

Cite this

Serbyn M, Senthil T, Lee P. Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 2011;84(18). doi:10.1103/PhysRevB.84.180403
Serbyn, M., Senthil, T., & Lee, P. (2011). Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. American Physical Society. https://doi.org/10.1103/PhysRevB.84.180403
Serbyn, Maksym, Todadri Senthil, and Patrick Lee. “Exotic S=1 Spin-Liquid State with Fermionic Excitations on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics. American Physical Society, 2011. https://doi.org/10.1103/PhysRevB.84.180403.
M. Serbyn, T. Senthil, and P. Lee, “Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice,” Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 18. American Physical Society, 2011.
Serbyn M, Senthil T, Lee P. 2011. Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice. Physical Review B - Condensed Matter and Materials Physics. 84(18).
Serbyn, Maksym, et al. “Exotic S=1 Spin-Liquid State with Fermionic Excitations on the Triangular Lattice.” Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 18, American Physical Society, 2011, doi:10.1103/PhysRevB.84.180403.
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