Regensburg 2025 – wissenschaftliches Programm

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

TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.28: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Inelastic Scattering in Anisotropic Heisenberg Models on Square and Honeycomb Lattice Via Continuous Similarity Transformations — •Vanessa Sulaiman¹, Dag-Björn Hering¹, Matthias R. Walther², Kai P. Schmidt², and Götz S. Uhrig¹ — ¹Condensed Matter Theory, Technische Universität Dortmund, Otto-Hahn-Straße 4, 44221 Dortmund, Germany — ²Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany

We apply a continuous similarity transformation (CST) [1,2] with a magnon-conserving generator to the antiferromagnetic anisotropic XXZ model. For the square lattice, the resulting effective Hamiltonian has already been analyzed [3]. We extend the approach by applying the CST to observables as well. Using the continuous fraction representation, we calculate spectral densities for these observables on the square and honeycomb lattice. These are then compared to experimental data from RIXS measurements [4], for example with single-layered Ca₂CuO₂Cl₂.

[1] M. Powalski et al., Phys. Rev. Lett. 115, 207202 (2015);

[2] M. Powalski et al., SciPost Phys. 4, 001 (2018);

[3] M. R. Walther et al., Phys. Rev. Res. 5, 013132 (2023);

[4] K.-J. Zhou et al., J. Synchrotron Rad. 29, 563 (2022).

Keywords: Continuous Similarity Transformation; Anisotropic XXZ Model; Inelastic Scattering; Antiferromagnetism