Nearly flat band with Chern number C=2 on the dice lattice
Name
Wang-2011-Nearly flat band with Chern number.pdf
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378.85 KB
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Adobe PDF
Checksum (MD5)
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Author(s)
Wang, Fa
Ran, Ying
Date Issued
December 2011
Journal
Physical Review B
Publisher
American Physical Society (APS)
Citation
Wang, Fa, and Ying Ran. “Nearly Flat Band with Chern Number C=2 on the Dice Lattice.” Physical Review B 84.24 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
Motivated by recent experiments on the material Ba[subscript 3]NiSb[subscript 2]O[subscript 9], 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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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.84.241103
