报告内容简介: 

Disordered hyperuniformity (DHU) is a recently proposed new state of matter, which has been observed in a variety of classical and quantum many-body systems. DHU systems possess no Brag peaks yet structurally behave like a crystal on large-length scales (i.e., characterized by vanishing infinite-wavelength density fluctuations). Recent studies have shown that DHU materials are endowed with unique novel physical properties such as optimal transport properties and isotropic large Photonic band gaps, and are superior to their crystalline (ordered) counterparts due to higher degree of symmetry and isotropy. In this talk, we will discuss a few exotic examples of DHU systems, including (i) hard-particle colloids at the jamming point (i.e., structural glasses), (ii) photoreceptor patterns in avian retina, (iii) and amorphous 2D silica. We show that each of the aforementioned DHU system is in an effective “critical” state, and possesses a form of “optimality” (i.e., maximally random jammed for the structural glasses, optimal light sampling efficiency for the photoreceptor patterns, and insulator-to-metal transition in 2D silica). We will conclude with several open questions, including the universal origin of hyperuniformity and methodologies for making HU materials with desirable functionalities.

报告人简介:   

Dr. Yang Jiao is currently an Associate Professor (with tenure) of Materials Science and Engineering and Dept. of Physics at Arizona State University. He obtained his B.S. from Peking University, China in 2005, majoring in engineering mechanics. He got his Ph.D. from the Department of Mechanical and Aerospace Engineering at Princeton University in 2010 and stayed at Princeton as a postdoc before joining ASU in 2013. He was mainly trained as a soft matter theorist at Princeton, working with Dr. Salvatore Torquato and Dr. Frank H. Stillinger (NAS member since 1984).

    The main focus of Dr. Jiao's research is the understanding of the fundamental physics of a wide range of material systems including composite materials, colloids, polymer gels, granular materials, and biological tissues and cells, using a variety of analytical and computational techniques devised in heterogeneous material theory, statistical mechanics, condensed matter physics and discrete geometry. Such understanding in turn allows him to employ powerful optimization methods to inversely design materials with desired properties for specific applications.

    Dr. Jiao has published more than 80 research papers in top tier scientific journals such as Nature, Nature Chemistry, PNAS, Phys. Rev. Lett., Phys. Rev. E, Soft Matter, Acta Mater. etc, which have been cited more than 3400 times. Dr. Jiao received many awards, including the Martin Summerfield Fellowship, Wu Prize for Excellence, Ray Grimm Prize in Computational Physics, DARPA Young Faculty Award in 2014, Doctoral New Investigator (DNI) Award from ACS PRF in 2016, and the Fulton Schools of Engineering Top 5% Teaching Award in 2018.

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