SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.1: Poster

Wednesday, March 29, 2023, 15:00–18:00, P2/OG3

Interplay between order-by-disorder and long-range interactions — •Jan Alexander Koziol and Kai Phillip Schmidt — Department of Physics, Staudtstraße 7, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

We study the ground-state properties of the antiferromagnetic long-range transverse-field Ising model in the limit of small transverse fields. We present degenerate perturbation theory calculations on the extensively degenerate nearest-neighbour ground-state space for finite systems, treating the long-range interaction and the transverse field perturbatively. The long-range interaction breaks the degeneracy and stabilises a gapped six-fold degenerate plain stripe phase in the absence of a transverse field. An infinitessimal transverse-field leads to an order-by-disorder emergent six-fold degenerate gapped clock-ordered phase in the nearest-neighbour case. We demonstrate a level crossing transition between the plain stripe phase and clock ordered phase for finite transverse fields and long-range interactions.