Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 60: Quantum-Critical Phenomena (joint session TT/DY)

TT 60.4: Vortrag

Donnerstag, 4. April 2019, 15:45–16:00, H23

Deconfined quantum criticality in the two-dimensional Su-Schrieffer-Heeger model — •Stefan Beyl, Martin Hohenadler, Florian Goth, and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Deutschland

The Su-Schrieffer-Heeger model is one of the most basic models for electron-phonon coupling. It captures the effects of fluctuating bond lengths—as described by quantum mechanical bond phonons—on the electronic hopping. While much work has been devoted to the one-dimensional case, systematic results in two dimensions are not available. Here, we present results from sign-free hybrid quantum Monte Carlo simulations at half-filling that support a deconfined quantum critical point between a valence bond solid and an antiferromagnet, as well as remarkable connections to an Ising lattice gauge theory with topologically ordered metallic and insulating phases.

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