Quantum Monte Carlo simulations on an 18-site honeycomb lattice at U=3.0 find negative two-body energy shifts in the charge-zero channel, indicating attraction but not conclusively a bound state.
Shields,Semiconductor quantum light sources, Nature Photonics1 (2007) 215
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Search for Stable States in Two-Body Excitations of the Hubbard Model on the Honeycomb Lattice
Quantum Monte Carlo simulations on an 18-site honeycomb lattice at U=3.0 find negative two-body energy shifts in the charge-zero channel, indicating attraction but not conclusively a bound state.