Checkerboard order in the – model on the square lattice

We propose that the inhomogeneous patterns seen by STM in some underdoped superconducting cuprates could be related to a bond-order-wave instability of the staggered flux state, one of the most studied “normal” state proposed to compete with the d-wave RVB superconductor. A checkerboard pattern is obtained by a Gutzwiller renormalized mean-field theory of the – model for doping around . It is found that the charge modulation is always an order of magnitude smaller than the bond-order modulations. This is confirmed by an exact optimization of the wavefunction by a variational Monte Carlo scheme. The numerical estimates of the order parameters are, however, found to be strongly reduced w.r.t their mean-field values.

Published in:
Journal of Magnetism and Magnetic Materials, 310, 2, 523-525

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 Record created 2019-06-24, last modified 2020-10-24

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