Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 68: Topology: Other Topics

TT 68.8: Talk

Friday, April 5, 2019, 11:30–11:45, H22

Breakdown of the topological fracton order in the X-Cube model — •Matthias Mühlhauser and Kai Phillip Schmidt — Institut für Theoretische Physik I FAU Erlangen-Nürnberg, Erlangen, Deutschland

We investigate the robustness of type-I topological fracton order under zero-temperature quantum fluctuations. To this end the exactly solvable three-dimensional X-cube model is studied in the presence of an external homogeneous magnetic field using high-order series expansions and variational techniques. It is found that the ground-state phase diagram displays first-order phase transitions between the topologically-ordered fracton phase and the polarized phase for all studied field directions. Furthermore, the spectral properties of the low-energy excitations in the fracton phase, especially so-called lineons and planons, are determined.