Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Charge Order
TT 39.8: Vortrag
Freitag, 9. September 2022, 13:00–13:15, H23
Reinvestigating the metallic region of the half-filled Hubbard Holstein model — Sam Mardazad1, Martin Grundner1, Ulrich Schollwöck1, Adrian Kantian2, Thomas Köhler3, and •Sebastian Paeckel1 — 1Department of Physics, Arnold Sommerfeld Center of Theoretical Physics, University of Munich, Germany — 2Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh, UK — 3Department of Physics and Astronomy, Uppsala University, Sweden
The one-dimensional Hubbard-Holstein model is the paradigmatic system to study the interplay between strongly correlated electrons and dispersionless lattice vibrations. Particularly, the intermediate regime of competing interactions has been heavily debated and only with the advent of powerful numerical techniques such as density-matrix renormalization group (DMRG) or advanced quantum Monte Carlo (QMC), the realization of an intermediate metallic phase has been established. However, these early studies are characterized by significant truncations of the phononic Hilbert spaces. Here, we exploit recent advances in the efficient representation of large local Hilbert spaces to re-examine the phase diagram by large-scale DMRG calculations, focussing on the regime of competing, strong interactions. This allows us to systematically study the complex competition between correlations, overcoming previous limitations.