# Allgemein

## Inter-orbital singlet pairing in Sr2RuO4: a Hund’s superconductor

Stefan Käser, Hugo U. R. Strand, Nils Wentzell, Antoine Georges, Olivier Parcollet, and Philipp Hansmann We study the superconducting gap function of Sr2RuO4. By solving the linearized Eliashberg equation with a correlated pairing vertex extracted from a dynamical mean-field calculation we identi...

## Quantum Showdown: Competing Methods of Solving Quantum Systems Put to the Test

A many-method study of the Hubbard model demonstrates how the field of computational quantum physics is evolving to be more collaborative.

## Tree Tensor-Network Real-Time Multiorbital Impurity Solver: Spin-Orbit Coupling and Correlation Functions in Sr2RuO4

X. Cao, Y. Lu, P. Hansmann, M. W. Haverkort We present a tree tensor-network impurity solver suited for general multiorbital systems. The network is constructed to efficiently capture the entanglement structure and symmetry of an impurity problem. The solver works directly on the real-time/frequenc...

## Mott insulating states with competing orders in the triangular lattice Hubbard model

Alexander Wietek, Riccardo Rossi, Fedor Šimkovic IV, Marcel Klett, Philipp Hansmann, Michel Ferrero, E. Miles Stoudenmire, Thomas Schäfer, Antoine Georges The physics of the triangular lattice Hubbard model exhibits a rich phenomenology, ranging from a metal-insulator transition, intriguing thermod...

## A superlattice approach to doping infinite-layer nickelates

R. A. Ortiz, D. T. Mantadakis, F. Misják, K. Fürsich, E. Schierle, G. Christiani, G. Logvenov, U. Kaiser, B. Keimer, P. Hansmann, E. Benckiser The recent observation of superconductivity in Sr-doped infinite-layer NdNiO2 thin films has attracted a lot of attention, since this compound is electronic...

## Charge disproportionation and nano phase separation in RSrNiO4

H. Guo, Z. W. Li, C. F. Chang, Z. Hu, C.-Y. Kuo, T. G. Perring, W. Schmidt, A. Piovano, K. Schmalzl, H. C. Walker, H. J. Lin, C. T. Chen, S. Blanco-Canosa, J. Schlappa, C. Schüßler-Langeheine, P. Hansmann, D. I. Khomskii, L. H. Tjeng, A. C. Komarek We have successfully grown centimeter-sized layere...

## From antiferromagnetic and hidden order to Pauli paramagnetism in UM2Si2 compounds with 5f electron duality

Using inelastic X-ray scattering beyond the dipole limit and hard X-ray photoelectron spectroscopy we establish the dual nature of the U 5f electrons in UM2Si2 (M = Pd, Ni, Ru, Fe), regardless of their degree of delocalization. We have observed that the compounds have in common a local atomic-like s...

## Predicted Superconductivity in Sn:Si(111) found experimentally

Employing advanced methods in quantum many-body theory in 2018 we predicted chiral d-wave superconductivity in correlated ad-atom lattices on the Si(111) surface (X. Cao et al.). Now, two years later, experimentalists in Tennessee have found superconductivity in hole doped Sn:Si(111) (X. Wu et al.)...

## Short group presentation

A ~20min introduction to our research field and Bachelor/Master projects can be found here!