Seminars & Lectures
| * TITLE | [APCTP Seminar] Electronic structure of strongly correlated system : LDA+DMFT approach | ||||||
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| * DATE / TIME | 2009-09-24, 4pm | ||||||
| * PLACE | Seminar room 512., APCTP Headquarters | ||||||
| * ABSTRACT | |||||||
| Strongly correlated system display remarkable phenomena such as metal to insulator transition, huge volume collapses, colossal magneto-resistance, and high temperature superconductivity. These materials contain open d- and f- electrons, and they cannot be described within the standard model of solid state physics. Over the last decade, there has been big progress in the strong correlation problem, using the Dynamical Mean Field Theory (DMFT) and its combination with first principles method (LDA+DMFT). In this talk, I will provide our recent application of LDA+DMFT in strongly correlated system, where we explain the anomalous behavior in its spectroscopy, transport, and optical properties. Our study includes (a) the actinide elements and their compounds [1, 2], where we show the magnetic and chemical properties of 5f electrons, (b) lanthanide intermetallic compounds [3], where we explain the temperature evolution of 4f electrons in heavy fermion system, and (c) newly discovered iron oxypnictide high temperature superconductor [4], where we predicted strong correlation in spectroscopy and optical properties. I will conclude with a discussion of future research directions and challenge problems. [1] Nature, 446, 513 (2007); [2] Physical Review Letters, 101, 126403 (2008) [3] Science, 318, 1615 (2007); [4] Physical Review Letters, 100, 226402 (2008). |
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