Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 39: Correlated Electrons: Charge Order

TT 39.6: Vortrag

Freitag, 9. September 2022, 12:30–12:45, H23

Chalcogenic orbital density waves in the weak- and strong-coupling limit — •Adam Klosinski¹, Andrzej M. Oles^2,3, Clio Efthimia Agrapidis¹, Jasper van Wezel⁴, and Krzysztof Wohlfeld¹ — ¹University of Warsaw, Warsaw, Poland — ²Jagiellonian University, Krakow, Poland — ³Max Planck Institute for Solid State Research, Stuttgart, Germany — ⁴University of Amsterdam, Amsterdam, The Netherlands

Stimulated by recent works highlighting the indispensable role of Coulomb interactions in the formation of helical chains and chiral electronic order in the elemental chalcogens, we explore the p-orbital Hubbard model on a one-dimensional helical chain. By solving it in the Hartree approximation we find a stable ground state with a period-3 orbital density wave. We establish that the precise form of the emerging order strongly depends on the Hubbard interaction strength. In the strong-coupling limit, the Coulomb interactions support an orbital density wave that is qualitatively different from that in the weak-coupling regime. We identify the phase transition separating these two orbital ordered phases and show that realistic values for the interorbital Coulomb repulsion in elemental chalcogens place them in the weak-coupling phase, in agreement with observations of the order in the elemental chalcogens.