Allgemein

The topological classification of electronic band structures is based on symmetry properties of Bloch eigenstates of single-particle Hamiltonians. In parallel, topological field theory has opened the doors to the formulation and characterization of non-trivial phases of matter driven by st...

by Yi-Ting Tseng, M. O. Malcolms, Henri Menke, Marcel Klett, Thomas Schäfer, and P. Hansmann We compare the dynamical mean-field descriptions of the single-band Hubbard model and the three-band Emery model at the one- and two-particle level for parameters relevant to high-Tc superconductors. ...

The unconventional superconductor Sr2RuO4 has long served as a benchmark for theories of correlated-electron materials. The determination of the superconducting pairing mechanism requires detailed experimental information on collective bosonic excitations as potential mediators of Cooper pairing. We...

In 2018 we predicted chiral d-wave superconductivity in hole-doped X:Si(111) (X=Sn,Pb) ad-atom systems (see Figure). Now - 5 years later - experimentalists confirm our prediction in boron doped Sn:Si(111) in a Nature physics article.

Stefan Käser, et al. 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 identify the dominant pairing channels. An analysis of the candidate gap functions in orbita...

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

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...

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...

R. A. Ortiz, H. Menke, 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 ...