Emergent Phenomena Seminar 290S/QM Seminar Speaker Thomas Scaffidi (U Toronto) Wednesday, December 8 at 2:00pm

Time/Venue Wednesday, December 8 at 2 pm in 402 Physics South and Zoom: https://berkeley.zoom.us/j/99523499113pwd=REovb3pyam03WXQwbEhrU3dqNHZvdz09 Meeting ID: 995 2349 9113 Passcode: 600704
Host Joel Moore
Evidence for deconfined U(1) gauge theory at the transition between toric code and double semion
Abstract Building on quantum Monte Carlo simulations, we study the phase diagram of a one-parameter Hamiltonian interpolating between trivial and topological Ising paramagnets in two dimensions, which are dual to the toric code and the double semion. We discover an intermediate phase with stripe order which spontaneously breaks the protecting Ising symmetry. Remarkably, we find evidence that this intervening phase is gapless due to the incommensurability of the stripe pattern and that it is dual to a U(1) gauge theory exhibiting Cantor deconfinement.

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