Nematicity in 3-band Hubbard model of cuprate superconductors

The recent discovery of intra-unit-cell nematicity in STM studies of cuprate superconductors [1] underscores the importance of the role played by oxygen orbitals in CuO2 plane. Motivated by this observation we study 3-band Hubbard model using exact diagonalization. In particular, we investigate the effects various interaction parameters (Ud, Up, Vpd, Vpp) have on nematicity. Interestingly, we find that Ud, the on-site repulsion at copper sites, enhances nematicity in the strongly coupled regime.\\[4pt] [1] Lawler, M. J. \textit{et al}. Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states. \textit{Nature} \textbf{466}, 347 (2010).