Dinámica de un hueco en cupratos superconductores

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

La Plata (virtual por pandemia)

Congreso; Encuentro Informal de Materia Condensada; 2020

Departamento de Física, Universidad Nacional de La Plata

We calculate the quasiparticle dispersion and spectral weight of the quasiparticle that results when a hole is added to an antiferromagnetically ordered CuO2 plane of a cuprate superconductor. We start from a multiband model for the cuprates considered previously [Nat. Phys. 10, 951 (2014)]. We map this model and the operator for creation of an O hole to an effective one-band generalized $t-J$ model, without free parameters. The effective model is solved using the state of the art self-consistent Born approximation. Our results reproduce all the main features of experiments. They also reproduce qualitatively the dispersion of the multiband model, giving better results for the intensity near wave vector (pi,pi), in comparison with the experiments. In contrast to what was claimed in [Nat. Phys. 10, 951 (2014)], we find that spin fluctuations play an essential role in the dynamics of the quasiparticle, and hence in both its weight and dispersion.