Correlations in Novel Quantum Materials 2022 (CNQM2022)

Session

Strong Correlations in Low Dimensions

23 Jun 2022, 14:00

2D5 (Max Planck Institut für Festkörperforschung)

61. Local Plaquette Physics as Key Ingredient of High-Temperature Superconductivity in Cuprates

Alexander Lichtenstein (University of Hamburg)

23/06/2022, 14:00

Keynote Talk / Invited Talk

We introduce a strong coupling dual super-perturbation scheme starting from the general reference system optimised for a given many-body problem. We discuss the physics of high-temperature cuprate superconductors starting from the highly degenerate four-site plaquette of the Hubbard model as a reference system. The degeneracy causes strong fluctuations when a lattice of plaquettes is...

50. Mott insulators with boundary zeros

Giorgio Sangiovanni (Uni Würzburg - Institut für Theoretische Physik und Astrophysik)

23/06/2022, 14:45

Keynote Talk / Invited Talk

In the recent literature, the concept of topological Mott insulator has been spelled out in quite different ways. Most of the proposed realizations rely either on Hartree-Fock approximations or on appropriately defined auxiliary degrees of freedom. I will discuss a novel, remarkably simple way of describing a topological Mott insulator without long-range order based on the topological...

5. Single- and two-particle properties of the weakly interacting two-dimensional Hubbard model in proximity to the van Hove singularity.

James LeBlanc (Memorial University of Newfoundland)

23/06/2022, 15:45

Contributed Talk

Leveraging the power of algorithmic Matsubara integration (AMI) we can generate pseudo-analytic results for virtually any diagrammatic expansion. Here we generate the longitudinal spin and charge susceptibilities for the 2D Hubbard model and employ our AMI toolset to obtain expressions that are explicit functions of chemical potential, temperature, interaction strength and frequency (both...

67. Bosons lost in translation

Friedrich Krien (TU Wien)

23/06/2022, 16:15

Keynote Talk / Invited Talk

Using appropriate terminology, we say more with fewer words. A useful terminology to describe two-particle electronic correlations was introduced by Hedin [1] and in the context of the spin-fermion model [2,3]. In this spirit, we show that re-expressing two-particle correlations through exchange bosons [4,5] greatly enhances the computational power of algorithms and, at the same time, gives us...