Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 70: Correlated Electrons: Method Development III

TT 70.1: Vortrag

Donnerstag, 12. März 2026, 09:30–09:45, HSZ/0101

Lineon Condensation in the XY toric code — •Maximilian Vieweg, Viktor Kott, Matthias Mühlhauser, and Kai Phillip Schmidt — Staudtstraße 7, 91058 Erlangen, Germany

In this work, we study the XY toric code[1] in an external magnetic field and determine its quantum phase diagram using high-order series expansions. The XY toric code is a generalization of the toric code that introduces anisotropic couplings on the star operators. The phase diagram of the XY toric code without a magnetic field is exactly solvable via duality mappings and hosts both topologically ordered and spontaneous-subsystem-symmetry-broken phases (SSSB), and therefore supports fractons and subdimensional particles as excitations in the SSSB phase. Our results for the transitions out of the SSSB in certain parameter regimes are consistent with an exotic second-order phase transition that is not described by a scale-invariant theory.
[1] M. Vieweg, K.P. Schmidt, Phys. Rev. Res. 7 (2025)

Keywords: Fracton; Topological Order; Quantum Phase Transitions; Toric Code