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DTSTAMP:20260915T210300Z
LAST-MODIFIED:20170215T142302Z
DTSTART:20170217T183000Z
DTEND:20170217T193000Z
UID:event1729@bu.edu
URL:http://physics.bu.edu/internal/events/show/1729
SUMMARY:Dynamic transition and its structural correlation
DESCRIPTION:Featuring Limei Xu\, Peking University\n\nPart of the Biophysic
	s/Condensed Matter Seminar Series.\n\nDynamic transition from Arrhenius to 
	non-Arrhenius behavior is reported in many glass-forming liquids. The mecha
	nism of such phenomenon was extensively debated. Different scenarios\, such
	 as phase transition\, partial crystallization\, or glass transition\, were
	 been proposed to understand the dynamic transition. In this presentation\,
	 I will talk about our recent study on the dynamic crossover in models of m
	olecular\, atomic and metallic systems. Our studies show that the structura
	l heterogeneity is the origin of the dynamic transition. For instance\, whe
	n the size of the largest cluster consisting of densely packed atoms starts
	 to increase sharply\, the dynamics starts to deviate from the high tempera
	ture behavior\, while the largest cluster percolates the entire system and 
	forms stable 3-dimentional network structures\, it follows the low temperat
	ure behavior. The potential energy landscape method study also confirms suc
	h scenario. Our study directly link the dynamic crossover with structure in
	homogeneity\, thus provide a more general picture for the dynamic transitio
	ns in glass-forming liquids.\n\na short CV\n****************\nLimei Xu rece
	ived her Ph.D. degree from the Department of Physics\, Boston University an
	d did her postdoc in the Chemistry Department\, University of Utah. In 2008
	 she joined the Advanced Institute of Materials Research (WPI-AIMR) at Toho
	ku University as an assistant professor. In 2011 she was selected as the Ju
	nior 1000 Talents by the Recruitment Program of Global Experts of China and
	 took the associate professor position at Peking University in China. She w
	as awarded the Distinguished Young Scholars by the National Science Foundat
	ion in 2015. Her current research interests include critical and supercriti
	cal phenomena in condensed matter physics\, surface science and nonequilibr
	ium statistical physics.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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