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Functional renormalization group for extremely correlated electrons
Jonas Arnold, Peter Kopietz, Andreas Rückriegel
At strong on-site repulsion , the fermionic Hubbard model realizes an extremely correlated electron system. In this regime, it is natural to derive the low-energy physics with…
Bad Metal Behavior and Lifshitz Transition of a Nagaoka Ferromagnet
Jonas Arnold, Peter Kopietz, Andreas Rückriegel
Using an extension of the fermionic functional renormalization group for systems where strong correlations give rise to projected Hilbert spaces we calculate the phase diagram and…
Functional renormalization group without functional integrals: implementing Hilbert space projections for strongly correlated electrons via Hubbard X-operators
Andreas Rückriegel, Jonas Arnold, Rüdiger Krämer +1
Exact functional renormalization group (FRG) flow equations for quantum systems can be derived directly within an operator formalism without using functional integrals. This simple…
Spin functional renormalization group for dimerized quantum spin systems
Andreas Rückriegel, Jonas Arnold, Raphael Goll +1
We investigate dimerized quantum spin systems using the spin functional renormalization group approach proposed by Krieg and Kopietz [Phys. Rev. B 99, 060403(R) (2019)] which direc…