Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.61: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P4
Metastability in Correlated Electron Systems — •Lara Bremer1, Martin Eckstein1, Hugo Strand2, and Tim Wehling1 — 1I. Institute of Theoretical Physics, University of Hamburg, Notkestraße 9-11, 22607 Hamburg, Germany — 2School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden
The objective of this study is to describe metastable states in correlated electron systems, with a particular focus on numerically accessing unstable solutions within coexistence regions of first-order phase transitions. Our work is based on the well-established phenomenon observed in the Mott transition of the single-orbital Hubbard model, where a coexistence region between a metallic phase and an insulating phase, accompanied by a third unstable solution, has been demonstrated within the framework of Dynamical Mean Field Theory. A Phase Space Extension algorithm is employed to effectively identify and analyse these solutions. By accessing this unstable solution, the double occupancy on this branch can be calculated, thus enabling the Landau free energy to be calculated via a thermodynamic route, as opposed to fitting a Landau free energy functional.
Keywords: Hubbard Model; Metastability; Correlated Electron Systems; Mott Physics