Low energy Hamiltonian and single hole dispersion for tetragonal CuO

L. O. MANUEL; A. A. ALIGIA; I. J. HAMAD

Praga

Congreso; International Conference on Strongly Correlated Electron Systems, SCES 2017; 2017

Inthe last decades there has been plenty of discussion concerning theappropriatelow energy Hamiltonian for the cuprates with CuO2 planes. While agreat part of the community considers that an effective single-bandHubbard model is valid for describing the basic physics, some authorsclaim that it is necessaryto include explicitly the oxygen degrees of freedom, leading to athree-band Hubbard model. Recently, tetragonal CuO (T-CuO) has beenproposed as an ideal material to discern between both models.Inthis work, we construct the low-energy Hamiltonian for T-CuO based onZangh-Rice singlets, that respects the symmetry of the lattice.Contrary to previous claims [1], we show that Zangh-Rice singlets ofdifferent sublattices have a non-trivial hopping, but this hoppinghas a different form than the one assumed in a previous work [2]. Wecalculate the single-hole dispersion using the self-consistent Bornapproximation and compare its predictions with photoemissionexperiments.[1]C. P. J. Adolphs, S. Moser, G. A. Sawatzky, and M. Berciu, Phys. Rev.Lett. 116,087002 (2016).[2]S. Moser et al., Phys. Rev. Lett. 113,187001 (2014). p { margin-bottom: 0.25cm; line-height: 120%; }a:link { }