Correlations in Novel Quantum Materials 2022 (CNQM2022)

Session

Numerical Approaches to Quantum Materials

22 Jun 2022, 09:00

2D5 (Max Planck Institut für Festkörperforschung)

55. New developments in nickelate superconductors

Karsten Held (TU Wien)

22/06/2022, 09:00

Keynote Talk / Invited Talk

Recent experimental progress has brought about better, defect-free infinite-layer nickelates [1] and the first finite-layer nickelate superconductor [2]. The measured superconducting dome is in exceedingly good agreement with our theoretical prediction [3] based on single Ni-$d_{x^2-y^2}$-band Hubbard model plus a decoupled electron reservoir for the pockets around the $A$ momentum and at low...

54. From three to one band models for high Tc cuprates: A closer look at single- and two particle observables

Philipp Hansmann (FAU)

22/06/2022, 09:45

Keynote Talk / Invited Talk

The different low energy effective Hamiltonians for cuprate high-Tc superconductors [1] can be considered as steps in a Wilsonian renormalization procedure from large- to small energy windows around the Fermi level. High energy models include bare interactions and all spin-, orbital-, and lattice degrees of freedom explicitly. However, at low energies many researchers consider the single band...

13. Kagome metals

Ronny Thomale (GNOI)

22/06/2022, 10:45

Keynote Talk / Invited Talk

The recent discovery of AV$_3$Sb$_5$ (A=K,Rb,Cs) has uncovered an intriguing arena for exotic Fermi surface instabilities in kagome metals. Aside from charge density wave order, a multi-dome superconducting phase is found, with strong indications to be of unconventional origin including features such as time reversal symmetry breaking. We find that the sublattice interference mechanism is...

59. Spin and charge response and pseudogap in the 2D Hubbard model

Michel Ferrero (Ecole Polytechnique)

22/06/2022, 11:15

Keynote Talk / Invited Talk

I will present recent numerically exact finite-temperature results for the two-dimensional Hubbard model obtained by diagrammatic Monte Carlo. I will show that there are several correlation regimes characterized by different magnetic correlation lengths and interaction strengths. I will discuss the connection between these regimes and the onset of a pseudogap. Finally, I will try to shake...