Theory of Quantum Matter

We are the quantum matter theory group at the University of Zurich. While we are very broadly interested in all aspects of condensed matter physics, we focus on quantum materials and topological and correlated systems. Besides their intrinsic scientific value, quantum materials with novel emergent phenomena can help to build new computer chips, memories, solar cells, and sensors.

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We explore innovative variational schemes that either involve wave functions constructed from neural networks or tensor networks (iPEPS) to tackle quantum magnets and correlated electron systems

Materials whose main structural motive is a kagome lattice provide a playground for novel topological and correlated phases. While we are generally interested in this broad class of materials, our focus so far has been on the AV3Sb5 family (A = Rb, K, Cs) and the interplay of charge order, flux order, and superconductivity.

We explore ways to stabilize fractional Chern insulators, how non-Abelian phases can be realized and what novel probes could be used to detect them.

We are interested in both fundamental aspect of unconventional superconductivity relating to symmetry and topology, as well as specific examples including the Kagome superconductors, 4Hb-TaS2 and locally non-centrosymmetric superconductor CeRh2As2.

In addition to the currently running projects, our group has an extensive expertise in various fields, ranging from higher-order topology and open quantum systems to methods development and applications of machine learning in (condensed matter) physics.