6月11日上午，应物理学院罗洪刚教授邀请，中科院物理所马女森博士到物理学院进行学术交流，并在格致楼4018会议室做了题为《Fractionalization and Emergent Symmetry at Deconfined Quantum Critical Point》的学术报告。

报告摘要：

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.

报告人简介：

马女森，2007年-2011年在中山大学完成本科和硕士阶段学习后，继续在中山大学师从姚道新教授攻读理论物理博士。目前在中科院物理所做博士后，主要做二维自旋系统退禁闭量子相变领域的研究工作。