Title: Fractionalization and Emergent Symmetry at Deconfined Quantum Critical Point

Time:12:00. Tuesday June 11, 2019  

Location: Conference Room 4018 Gezhi Building

Deconfined Quantum Critical point (DQCP) is a quantum phase transition beyond the Landau-Ginzburg-Wilson paradigm. It is a continuous critical point separating two phases that break different symmetries. In this talk I will show you the dynamical spin structure factor on the easy-plane JQ (EPJQ) model which is believed to have the deconfined quantum critical point. It shows the deconfined spinon excitation at the critical point as a very obvious property for experiment to test DQCP. After that, I will show the study of emergent symmetry at DQCP in EPJQ model. Different from previous method of calculating exponents or histogram,Noether’s therorem is used in this talk to test the continuous symmetry at critical point.

It shows further evidence of emergent symmetry at DQCP from the result of conserved current calculated by Quantum Monte Carlo simulation method. Our way of testing emergent symmetry also provides new aspect of view in studying continuous symmetries.