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Title:
Deconfined quantum critical points: symmetries and dualities
Speaker:
Abstract:
The deconfined quantum critical point (QCP), separating the Neel and valence bond solid phases in a 2D antiferromagnet, was proposed as an example of quantum criticality outside of the conventional Landau-Ginzburg-Wilson paradigm. In this talk, I’ll present multiple equivalent descriptions of the deconfined QCP, and use these to address the possibility of an enlarged emergent SO(5) symmetry in the low energy limit. Such an enlarged symmetry is, indeed, observed in numerical simulations. If time permits, I’ll also discuss how the Lieb-Schultz-Mattis theorem, which prohibits a trivial gapped state in systems with spin ½ per unit cell, is manifested in the low energy descriptions of the deconfined QCP.
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