Metal-insulator transitions and topological properties of pyrochlore iridates
- Date
- Oct 26, 2015
- Time
- 9:30 AM - 10:30 AM
- Speaker
- Dr. Hongbin Zhang
- Affiliation
- TU Darmstadt, Theory of Magnetic Materials Group
- Language
- en
- Main Topic
- Materialien
- Other Topics
- Materialien, Physik
- Host
- Grit Rötzer
- Description
- Combining density functional theory (DFT) and embedded dynamical mean-field theory (DMFT) methods, we study the metal-insulator transition in R2Ir2O7 (R=Y, Eu, Sm, Nd, Pr, and Bi) and the topological nature of the insulating compounds. Based on accurate free energies obtained using the DFT+DMFT methods, we found that both band width and more importantly quantum fluctuations play an important role in metal-insulator transitions. Thus, the metal-insulator transition can be understood as a competition between paramagnetic Kondo insulator and all-in-all-out magnetically ordered insulating phases. We further demonstrate that within this state-of-the-art theoretical method, the insulating bulk pyrochlore iridates are topologically trivial. .
- Links
Last modified: Oct 26, 2015, 8:52:39 AM
Location
Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (D2E.27, IFW Dresden)Helmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
Organizer
Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
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