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MA: Fachverband Magnetismus

MA 11: Computational Magnetism 1

MA 11.6: Talk

Monday, September 5, 2022, 16:15–16:30, H48

Quantitative Functional RG Approach to Spin Hamiltonians at Finite Temperatures — •Benedikt Schneider — Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig Maximilian University Munich, 80333, Germany

The pseudo-fermion functional renormalization group (pf-fRG) has been successfully applied to study frustrated magnets and identify several spin liquid candidates. However, its applicability has been limited to zero temperature. We develop a generalized pf-fRG method based on the Popov-Fedotov trick that produces quantitatively accurate results for spin Hamiltonians at finite temperature. A special feature of our approach is that implementation of infinite lattices with long-range interactions and complicated lattice geometries is straightforward.