{"166971":{"#nid":"166971","#data":{"type":"event","title":"Topological Excitations in Liquids and Glasses","body":[{"value":"\u003Ch4\u003ESchool of Physics Colloquium: Presenting Takeshi Egami, University of Tennessee Knoxville\u003C\/h4\u003E\u003Cp\u003ECondensed matter physics in the 20\u003Csup\u003Eth\u003C\/sup\u003E Century was developed mostly for crystalline solids, and we know so little about the physics of liquids and glasses.\u0026nbsp; We do not even know how to describe the structure of these amorphous matters to discuss the structure-properties relationship, even though liquids and glasses are so important to everyday life.\u0026nbsp; This is because liquids and glasses are condensed matter with high density in which atoms are strongly correlated to each other.\u0026nbsp; Any theoretical effort runs into a thick barrier of many-body interactions.\u0026nbsp; To circumvent this difficulty the dynamics of a liquid is described usually by the continuum hydrodynamic theories with non-linear extension.\u0026nbsp; An alternative approach is to use the molecular dynamics (MD) simulation, taking advantage of recent progress in computing power.\u0026nbsp; However, MD simulations tend to leave us in a deluge of numbers, without a physical idea.\u0026nbsp; Our effort focused on breaking this conundrum by developing new concepts, using MD as a tool to shape the concept.\u0026nbsp; We introduced the idea of local topology of atomic connectivity, expressed in terms of the atomic level stresses.\u0026nbsp; We show that the macroscopic dynamics of a liquid and glass is directly connected to the local atomic dynamics in the form of topological excitations.\u0026nbsp; Characterization of these excitations leads to a better understanding of the glass transition and mechanical failure of a glass.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Ch2 class=\u0022mainTitle\u0022\u003ETopological Excitations in Liquids and Glasses\u003C\/h2\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Topological Excitations in Liquids and Glasses"}],"uid":"27664","created_gmt":"2012-10-31 12:34:27","changed_gmt":"2016-10-08 02:00:59","author":"Alison Morain","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2012-11-05T14:00:00-05:00","event_time_end":"2012-11-05T15:00:00-05:00","event_time_end_last":"2012-11-05T15:00:00-05:00","gmt_time_start":"2012-11-05 19:00:00","gmt_time_end":"2012-11-05 20:00:00","gmt_time_end_last":"2012-11-05 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"related_links":[{"url":"http:\/\/www.physics.gatech.edu\/seminars-colloquia\/series\/physics-colloquium\/takeshi-egami-20121105","title":"http:\/\/www.physics.gatech.edu\/seminars-colloquia\/series\/physics-colloquium\/..."},{"url":"http:\/\/www.engr.utk.edu\/mse\/faculty\/egami\/default.html","title":"http:\/\/www.engr.utk.edu\/mse\/faculty\/egami\/default.html"}],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"44601","name":"Physics colloquium"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}