Technical University of Munich
Lehrstuhl für Theorie der Quantenmaterie (Prof. Knolle)
James-Franck-Str. 1
85748 Garching b. München
Our focus is on condensed matter systems in regimes in which the laws of quantum mechanics are important. In condensed matter physics, complex behavior arises from the interaction of a large number of basic degrees of freedom. It is fascinating to uncover the richness of this behavior, and to understand the universal principles that organize the physical world. Our research has been centered around one of the great topics of modern physics — the search for unconventional quantum phases in correlated materials, e.g., quantum spin liquids, unconventional superconductors or topological Kondo insulators. This search leads to a deeper understanding of the fundamental principles driving these phases, and it also has practical relevance for future quantum technology. The underlying theme of our work is to bridge the gap between novel theories and actual experiments. Advances in the theory of topological phases of matter happen in parallel to developments in materials science. Our group combines both lines of research, which is crucial for new discoveries. We aim to transfer abstract mathematics to experimentally relevant situations.
Nature
Abstract: Time-dependent drives hold promise for realizing non-equilibrium many-body phenomena that are absent in undriven systems1, 2–3. Yet, drive-induced heating normally destabilizes the systems4,5, which…
Physical Review B
Abstract: The dynamical structure factor of the transverse field Ising model (TFIM) shows universal power-law divergence at its quantum critical point, signatures of which have been arguably observed in…
Physical Review B
Abstract: Altermagnetism is a collinear magnetic order in which opposite spin species are exchanged under a real-space rotation. Hence, the search for physical realizations has focused on crystalline solids…
Physical Review B
Abstract: In translationally invariant semiconductors that host exciton bound states, one can define an infinite number of possible exciton Berry connections. These correspond to the different ways in which a…
Science
Abstract: Disorder-induced phenomena in quantum many-body systems pose a challenge for analytical and numerical approaches at relevant time and system scales. To reduce the cost of disorder sampling, we…
Physical Review B
Abstract: We investigate low-energy excitons in rhombohedral pentalayer graphene encapsulated by hexagonal boron nitride (hBN/R5G/hBN), focusing on the regime at the experimental twist angle θ = 0.77◦ and with…
Physical Review Letters
Abstract: The Berezinskii-Kosterlitz-Thouless (BKT) transition is an archetypal example of a topological phase transition, which is driven by the proliferation of vortices. In this Letter, we analyze the…
Physical Review X
Abstract: Dirac magnons, the bosonic counterparts of Dirac fermions in graphene, provide a versatile platform to explore symmetry-protected band crossings and quantum geometry in magnetic insulators while…
npj Quantum Materials
Abstract: Recent Raman experiments on the Kitaev material α-RuCl3 have reported a finite Raman circular dichroism (RCD), revealing chiral phonon behavior not expected from lattice symmetry alone. To explain…
Physical Review B
Abstract: Prethermalization phenomena in driven systems are generally understood via a local Floquet Hamiltonian obtained from a high-frequency expansion. Remarkably, recently it has been shown that a driven…
