Abstract
The superconducting ground states in a lightly doped t-J-U model for a monolayer honeycomb lattice are studied. We consider a strong Hubbard repulsion U with a renormalized mean field theory, where the site double occupancy is optimized for the lowest system energy. We consider translationally invariant states. When we also impose a rotational symmetry, chiral d±id′ wave states are found to be the ground states at low doping levels, in accord with earlier literatures. When spontaneously broken rotational symmetry is allowed, anisotropic dimerized superconducting states are found to be the ground states at very low doping levels. These dimerized states are also fully gapped at Fermi level, but have narrower band widths when compared with the d±id′ wave states. This study may be related to lightly doped In3Cu2VO9 compounds.
Published Version
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