Universality out of stochastic driving (Oct. 8, 2021)

  • Published: 2021-09-30

Time:  10:00am  (UTC/GMT+8:00, Beijing/Shanghai), Oct. 8 (Fri.) , 2021

Venue: M830, M Building of Institute of Physics, CAS 


Speaker: Zi Cai (SJTU)



In this talk, we study the mean-field dynamics of a general class of quantum many-body systems with stochastically fluctuating interactions. Our findings reveal a universal algebraic decay of the order parameter $m(t)\sim t^{-\chi}$ with an exponent $\chi=\frac 13$ that is independent of most system details including the strength of the stochastic driving, the energy spectrum of the undriven systems, the initial states and even the driving protocols. It is shown that such a dynamical universality class can be understood as a consequence of a diffusive process with a time-dependent diffusion constant which is determined self-consistently during the evolution. The finite-size effect, as well as the relevance of our results with current experiments in high-finesse cavity QED systems are also discussed.




蔡子,上海交通大学特别研究员。 2010年中科院物理所获得博士学位。先后在美国加州大学圣迭戈分校,德国慕尼黑大学,奥地利科学院量子光学与量子信息研究所从事博士后研究。主要研究方向为量子多体物理中的理论和数值计算。研究领域包括凝聚态物理,冷原子系统,以及量子开放系统中涌现的的强关联物理。