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arXiv · 1508.00404

Hidden string order in a hole-superconductor with extended correlated hopping

Ravindra W. Chhajlany·Przemysław R. Grzybowski·Julia Stasińska·Maciej Lewenstein·Omjyoti Dutta
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Abstract

Ultracold fermions in a one-dimensional, spin-dependent, optical lattice are described by a non-standard Hubbard model with next-nearest-neighbour correlated hopping. Periodic driving of the lattice allows wide tuning of the system parameters. We solve this model exactly for a special value of the correlated hopping. The solution reveals the general properties of this system for arbitrary filling: exact and asymmetric spin-charge separation, a gapless spectrum of lowest energy excitations, a spin-gap, which may be interpreted in terms of collective hole pairing and a non-vanishing den Nijs-Rommelse type string correlator. Numerical studies away from the integrable point show the persistence of both long range string order and spin-gap.

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Ravindra W. Chhajlany, Przemysław R. Grzybowski, Julia Stasińska, Maciej Lewenstein, Omjyoti Dutta. 2015-08-03. Hidden string order in a hole-superconductor with extended correlated hopping. https://doi.org/10.1103/physrevlett.116.225303

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