SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 65: Correlated Electrons: Other Theoretical Topics
TT 65.10: Vortrag
Freitag, 31. März 2023, 12:00–12:15, HSZ 204
Absence of fractal quantum criticality in the quantum Newman-Moore model — •Raymond Wiedmann1,2, Lea Lenke1, Matthias Mühlhauser1, and Kai Phillip Schmidt1 — 1Friedrich-Alexander-Universität, Erlangen-Nürnberg, Germany — 2MPI-FKF, Stuttgart, Germany
The quantum phase transition between the high-field polarized phase and the low-field fracton phase with type-II fracton excitations is investigated in the two-dimensional self-dual quantum Newman-Moore model. We apply perturbative and numerical linked cluster expansions to calculate the ground-state energy per site in the thermodynamic limit revealing a level crossing at the self-dual point. In addition, high-order series expansions of the relevant low-energy gaps are determined using perturbative continuous unitary transformations indicating no gap-closing. Our results therefore predict a first-order phase transition between the low-field fracton and the high-field polarized phase at the self-dual point.