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Department of Physics

Scientific Projects

DFG-Sachbeihilfe: UH 90/14-1 (with Kai P. Schmidt)

Interacting spin waves in quantum antiferromagnets in two dimensions

This project builds on the recent methodological progress for non-perturbative continuous similarity transformations (CSTs) in momentum space, which enables a quantitative understanding of the magnetic excitations and their dynamic correlations of the paradigmatic square-lattice  Heisenberg model. The CST maps the strongly correlated quantum many-body problem to an effective model conserving the number of dressed spin waves with strong mutual attractive interactions. We plan to study various unfrustrated two-dimensional Heisenberg models and frustrated ones as well.
see: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 434439878