research topics
The theory of quantum materials is at the intersection of several vibrant and hot areas of research: Band topology, band structure engineering, van-der-Waals heterostructures, twistronics, strongly correlated 2d electrons and many more. The starting point is always the strikingly simple question: Can we combine some known ways of manipulating an electronic state to create entirely new behaviors in the system?
electron hydrodynamics
Hydrodynamic electron flow is the intriguing and elusive phenomenon where electrons behave almost like a classical viscous fluid. Recent experimental progress has made it possible to study the intricate properties of charged viscous fluids in various compounds, with and without a magnetic field. We study the ballistic-to-hydrodynamic crossover analytically and numerically to hopefully explain experimental observations and in order to discover new ways to probe electronic correlations.
nonlinear conductivity
Beyond linear order, the electrical conductivity still holds many surprises. For example, we recently showed that Landau's Fermi liquid paradigm breaks down beyond linear response. It is our goal to explore and classify nonlinear effects to make them applicable in the characterization quantum materials and detection of ordered states.
superconductivity and correlations in multilayer graphene
Stacking a few layers of graphene on top of each other in various ways reveals an almost unimaginable multitude of metallic, topological and correlated states. Exploring this richness is a major research focus in our group.
quantum geometry
Band structure topology has been a main driving force in condensed matter research in the last years. But there is more. We explore the consequences of the local quantum geometry of the electronic ground state, revealing in unprecedented detail the intimate connection between Hilbert space geometry and the wave function in real space.