[Zurück]

A. Kauch, F. Hörbinger, P. Pudleiner, G. Li, K. Held:
"Impact of magnetic fluctuations on superconductivity and optical response in 2D strongly correlated systems";
Vortrag: Spectroscopies in Novel Superconductors SNS 2019, Tokyo; 16.06.2019 - 21.06.2019.

Thanks to new computational advances in parquet equations methods [1] we can unbiasedly study the interplay between fluctuations in the magnetic, density and pairing channels in 2D lattice models. The results confirm that strong antiferromagnetic fluctuations lead to d-wave pairing in the optimally doped regime of the Hubbard model on square lattice and point to a possible triplet s-wave pairing symmetry in the overdoped regime, where magnetic fluctuations become incommensurate [2]. The antiferromagnetic fluctuations become very important also for the density channel, being part of the dominant contribution to optical conductivity beyond the bubble part, forming new polaritons: -tons [3]. The applied methods: parquet dynamical vertex (DA) and parquet approximations allow for diagrammatic decomposition of the results and physical analysis of the contributions.