cfaed Seminar Series
cfAED Seminar Series
Prof. Dr. André Schleife , University of Illinois at Urbana-Champaign (USA), Department of Materials Science and Engineering
High-Performance Computing and Multi-Scale Simulations: Predictions for Excited Electrons and Ultrafast Electron-Ion Dynamics in Complex Materials
08.01.2015 (Thursday)
, 13:00 - 14:00
TU Dresden, HAL Building, Room HAL 115 , Hallwachsstr. 3 , 01069 Dresden
Rapidly advancing high-performance super computers such as “Blue Waters” allow calculating properties of increasingly complex materials with unprecedented accuracy. In order to fully take advantage of leadership-class machines and to accurately describe modern materials, codes need to scale well on hundreds of thousands of processors. This talk focuses on electronic excitations and their ultrafast attosecond dynamics that are notoriously difficult to capture due to the quantummechanical electron-electron interaction.
Abstract
Being omnipresent in electronic and optical materials, an accurate description is a crucial factor for computational design of materials for technological applications. It will be outlined how cutting-edge first-principles techniques based on many-body perturbation theory accomplish predictive theoretical spectroscopy of electronic excitations e.g. in transparent conducting oxides. Connecting these results to multi-scale methods is crucial to understand meso-scale structures of these materials with important applications in optoelectronics and photovoltaics. Explicitly studying ultrafast real-time dynamics of electrons and ions is important e.g. for energy harvesting, radiation damage, as well as for a fundamental understanding of its nonadiabatic character. It will be shown how high-performance computational schemes such as Ehrenfest molecular dynamics provide accurate, new insights from first principles. Such cutting-edge electronic-structure simulations, multi-scale techniques, and high-performance computing are becoming integral tools of the computational materials science community to tackle materials problems of the future.
André Schleife is a Blue Waters Assistant Professor in the Department of Materials Science and Engineering at the University of Illinois at Urbana-Champaign. He obtained his Diploma and Ph.D. at Friedrich-Schiller-University in Jena, Germany for his theoretical work on transparent conducting oxides. Before he started at UIUC he worked as a Postdoctoral Researcher at Lawrence Livermore National Laboratory on a project that aimed at a description of non-adiabatic electron ion dynamics. His research revolves around excited electronic states and their dynamics in various materials using accurate computational methods and making use of modern super computers in order to understand, for instance, how light is absorbed in photo-voltaic materials.
This talk is organized by Dresden Center Computational Materials Science
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Location: Seminar Room (115), Hallwachsstr. 3 (HAL), TU Dresden