Technical University of Munich
Chair of Theorie der Quantenmaterie und Nanophysik (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.
Physical Review X
Abstract: Bosonic excitations like phonons and magnons dominate the low-temperature transport of magnetic insulators. Similar to electronic Hall responses, the thermal Hall effect (THE) of charge-neutral bosons…
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: 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…
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: 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…
Nature Communications
Abstract: Chaos makes isolated systems of many interacting particles quickly thermalize and forget about their past. Here, we show that quantum mechanics hinders chaos in many-body systems: although the quantum…
Nature Physics
Abstract: Conventional phases of matter can be characterized by the symmetries they break, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently,…
Physical Review Letters
Abstract: We investigate a model of Dirac fermions with mass impurities that open a global topological gap even in the dilute limit. Surprisingly, we find that the chirality of this mass term, i.e., the sign of…
Journal of Physics Condensed Matter
Abstract: We investigate spin systems with extensive degeneracies in the classical ground states due to anisotropic frustrated spin interactions, where the degeneracy is not protected by symmetry. Using spin…
Physical Review Letters
Abstract: Altermagnets are a new class of symmetry-compensated magnets with large spin splittings. Here, we show that the notion of altermagnetism extends beyond the realm of Landau-type order: we study exactly…
