【学术报告】非平衡态超均匀完美光子流体
【学术报告】非平衡态超均匀完美光子流体
倪冉教授，新加坡南洋理工大学化学与生物医学工程学院
报告题目: Non-Equilibrium Strongly Hyperuniform Fluids of Circle Active Particles with Large Local Density Fluctuations - towards perfect photonic fluids
时间与地点：2018年11月28日（周三）上午10：00-11：00，21教学楼316会议室
报告摘要：
Disordered hyperuniform structures are an exotic state of matter having vanishing long wave-length density fluctuations similar to perfect crystals but without long-range order. Although its importance in materials science has been brought to the fore in the past decade, the rational design of experimentally realizable disordered strong hyperuniform micro-structures remains challenging. Here, by using computer simulations and theoretical analyses, we discover a new type of dynamic disordered fluid state with strong hyperuniformity in 2D systems of chiral active particles where particles perform independent circular motions of the radius R with the same handedness. In the strong driving or zero-noise limit, this system undergoes an absorbing-active transition to form a non-equilibrium strongly hyperuniform fluid. This new hyperuniform fluid features a special length scale, i.e., the diameter of the circular trajectory of particles, below which large density fluctuations as a result of dynamic cluster formation are observed. By developing a dynamic mean-field theory, we show that the dynamic cluster formation can be explained as an motility-induced microphase separation at mean-field level, while the Fickian diffusion at large length scales and local center of mass conserved interaction are responsible for the global hyperuniformity. Our results suggest the possibility of designing active matter system to form hierarchical disordered hyperuniform materials.
个人简介：
Dr. Ni （倪冉）received his B.S. (2005) in Computational Mathematics and M.S. (2008) in Chemical Engineering from Beijing University of Chemical Technology. From 2008 to 2012, he did his Ph.D. in Physics with Prof. Marjolein Dijkstra in Utrecht University (the Netherlands) focusing on the computational study on the self-assembly of colloidal systems. From 2012 to 2014, he did his postdoc with Profs. Martien A. Cohen Stuart and Peter G. Bolhuis focusing on the self-assembly of fibril-forming polypeptides. In 2014, he was awarded the NWO VENI fellowship which is the most prestigious personal grant for young scientists in the Netherlands to start independent research. In March 2016, he joined the School of Chemical and Biomedical Engineering in Nanyang Technological University as an assistant professor. In 2016, he was awarded the Best Research Prize by the European Cooperation in Science and Technology (COST) Action – Flowing Matter [An annual prize for European Early Stage Researchers in soft matter within eight years after the date of PhD].