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Raül Perea Causín

Raül Perea Causín

Nordita Assistant Professor

Condensed Matter

About

I obtained my PhD in 2023 at Chalmers University of Technology, where I developed microscopic models of excitons and charge complexes in atomically thin semiconductors, work that was recognized with the Department of Physics and Graphene Center at Chalmers best PhD thesis awards. From 2024 to 2026 I worked as a postdoc at Stockholm University, working on fractional topological order in twisted (moiré) 2D materials.

My research focuses on understanding and predicting emergent quantum phases of matter that arise from the interplay of strong interactions and topology. I am particularly interested in topological order in moiré materials, where nearly-flat bands with non-trivial quantum geometry provide a powerful platform for realizing exotic many-body physics. My research interests also include excitonic phenomena in two-dimensional semiconductors, including trions and Bose-Fermi mixtures.

Topological order and fractional Chern insulators
A central direction of my research is the study of fractional Chern insulators and related topological phases in moiré heterostructures. These systems enable the realization of strongly correlated topological states without external magnetic fields, such as the fractional quantum anomalous Hall effect. My recent work has provided deep insights on the stabilization of quantum anomalous Hall crystals, the emergence of topological order in topologically trivial bands, and the potential realization of non-Abelian (Read-Rezayi) phases hosting Fibonacci anyons.

Excitons and bosonic quantum matter
Excitons in atomically thin semiconductors provide a unique solid-state platform for realizing bosonic quantum phases of matter. I have developed models to describe excitonic complexes in two-dimensional semiconductors, with the goal of understanding and predicting relevant experimental signatures. Recently, I have demonstrated the high stability of exciton fractional Chern insulators in moiré heterostructures and established excitonic systems as a promising platform for realizing (Abelian and non-Abelian) bosonic topological order.

Correlated topological matter in 2D materials