SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 51: Correlated Electrons: Charge Order
TT 51.2: Vortrag
Donnerstag, 30. März 2023, 15:15–15:30, HSZ 103
Effect of higher-order van Hove singularity on the formation of spin density waves — Alkistis Zervou1, Garry Goldstein2, Joseph Betouras1, and •Dmitry Efremov3 — 1Department of Physics and Centre for the Science of Materials, Loughborough University, Loughborough LE11 3TU, UK. — 2Physics Department, Boston University, Boston MA 02215, USA — 3Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany.
Van-Hove singularities in the density of states, which occur due to Lifshitz transitions in electronic band structures, affect different types of ordering in quantum materials. In addition to the usual Van Hove singularities, there are higher-order Van Hove singularities (HOVHS) with DOS divergence according to the power law. We find that the spin wave density and charge density of the phase formation can be enhanced by the presence of a singularity depending on the strength of certain interactions, with the critical temperature increasing by orders of magnitude. We discuss the application of our findings to various experimental systems such as Sr3Ru2O7.