Nonlocal String Order Parameter in the S=1/2 Kitaev-Heisenberg Ladder

@article{Catuneanu2019NonlocalSO,
  title={Nonlocal String Order Parameter in the S=1/2 Kitaev-Heisenberg Ladder},
  author={A. Catuneanu and E. S{\o}rensen and H. Kee},
  journal={Bulletin of the American Physical Society},
  year={2019}
}
We study the spin-12 Kitaev-Heisenberg (KJ) model in a two-leg ladder. Without a Heisenberg interaction, the Kitaev phase in the ladder model has Majorana fermions with local Z2 gauge fields, and is usually described as a disordered phase without any order parameter. Here we identify a long-range nonlocal string order parameter (SOP) in the Kitaev phase which survives with a finite Heisenberg interaction. The SOP is obtained by relating the Kitaev ladder, through a nonlocal unitary… Expand
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