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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…
cond-mat.str-el2025
Plasmon-sound hybridization in ionic crystals
Jakob Rappolt, Andreas Rückriegel, Peter Kopietz
We study the hybridization between plasmons, phonons, and electronic sound in ionic crystals using the Debye model, where the ionic background is modeled as a homogeneous, isotropi…