2010/12/31 by Hsin-Hua Lai, Olexei I. Motrunich
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.83.155104
published as Phys. Rev. B 83, 155104 (2011) · 6 pages, 5 figures
arxiv created 2011/04/12 · arxiv updated 2015/03/17
We study bond energy correlation functions in an exactly solvable quantum spin model of Kitaev type on the kagome lattice with stable Fermi surface of partons proposed recently by Chua et al, Ref.\[arXiv:1010.1035]. Even though any spin correlations are ultra-short ranged, we find that the bond energy correlations have power law behavior with a 1/|\bm r|3 envelope and oscillations at incommensurate wavevectors. We determine the corresponding singular surfaces in momentum space, which provide a gauge-invariant characterization of this gapless spin liquid.