Quantum Matter Seminar

Deconfined Quantum Multicriticality

Ryan Thorngren, Professor of Physics, Physics and Astronomy, University of California, Los Angeles,

I will discuss the multicritical point in the Fradkin-Shenker model, also known as the toric code in an in-plane field. This multicritical point does not admit any Landau-Ginzburg description, but I will show how to describe it using Nf = 2 QED3. This revives an old proposal for deconfined quantum criticality in the easy-plane Neel-VBS transition, which turned out to be first order. Instead, we will find a deconfined quantum multicritical point, with the 1st order nature of the Neel-VBS transition explaining the famous duality-breaking line in the Fradkin-Shenker model. I will also discuss multicritical versions of the duality with the easy-plane CP1 model, and a U(1) symmetric version of the Fradkin-Shenker model. This talk is based on upcoming work with Pierluigi Niro and Thomas Dumitrescu.

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For more information, please contact Stephanie Malin by phone at 6263956611 or by email at [email protected].

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