Exotic S=1 spin-liquid state with fermionic excitations on the triangular lattice
Name
Serbyn-2011-Exotic S
Size
210.32 KB
Format
Adobe PDF
Checksum (MD5)
73011679d9756d284da9e094dd069f1e
Author(s)
Serbyn, Maksym
Senthil, Todadri
Lee, Patrick Lee
Date Issued
November 2011
Journal
Physical Review B
Publisher
American Physical Society
Citation
Serbyn, Maksym, T. Senthil, and Patrick Lee. “Exotic S=1 Spin-liquid State with Fermionic Excitations on the Triangular Lattice.” Physical Review B 84.18 (2011): [4 pages]. ©2011 American Physical Society.
Version
Final published version
Abstract
Motivated by recent experiments on the material Ba₃NiSb₂O₉, 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.180403
