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Group seminar Theoretical Physics III


15.11.2017 11 a.m., room: S-439
Dr. Ivan Leonov
Electronic Structure, Magnetic Properties, and Phase Stability of Correlated Materials
22.11.2017 11 a.m., room: S-439
B.Sc. Jakob Bonart
Scaling behavior in confining potentials
29.11.2017 11 a.m., room: S-439
Dr. Gheorghe Lucian Pascut (Rutgers University, USA)
Orbital selectivity and isostructural phase transitions in AMnO3- perovskites

Oxides with perovskite structure-type containing Mn ions are well known for interesting physical phenomena, such as colossal magnetoresistance, insulator-metal transition, ferroelectricity coexisting with long range magnetic order, orbital and charge ordering, etc. DFT+DMFT methods are applied to LaMnO3 and BiMnO3, which are the most studied materials in the AMnO3 class. Unusual electronic states with orbital selectivity are found, such as Site- and Orbital-Selective Mott state, Orbital-Selective Mott state and Mott-Band state. Some of these novel states are an alternative explanation to the previously proposed orbital disordered states, which are relevant to the phenomenology of colossal magnetoresistance phenomena. In this talk I will describe the electronic properties of these states and I will argue that these novel states are a consequence of the interplay between the orbital and electronic degrees of freedom of the manganese correlated d-electrons, the sp-electrons of the A ions and the lattice. I will show that our results are in agreement with temperature dependent resonant x-ray scattering measurements, which up to present could not be explained by other theoretical models. Using DFT+DMFT, I will propose an alternative description to the accepted Jahn-Teller phase transition mechanism in these materials. In addition, I will show that the properties of these novel orbital selective electronic states can be predicted by DFT+DMFT. This is possible due to the recent theoretical developments of forces for structural relaxations in correlated materials within the DFT+DMFT, which allows one to quantitatively study the couplings between structural and electronic degree of freedom in correlated materials.

6.12.2017 11 a.m., room: S-439
Dr. Narayan Mohanta
Search for Majorana fermions in artificial heterointerfaces
11.12.2017 12:15 p.m., room: S-439
Prof. Dr. Milos Radonjic (Institute of Physics Belgrade, Serbia)
Phonon anomalies in FeS
Bitte besonderen Termin beachten.
13.12.2017 11 a.m., room: S-439
Dr. Andreas Östlin
Disorder and correlation for realistic materials: a LDA+DMFT and CPA approach
10.1.2018 11 a.m., room: S-439
Priv.-Doz. Dr. Marcus Kollar
On the scaling and statistics of scattering amplitudes
17.1.2018 11 a.m., room: S-439
M.Sc. Marc Alexander
Prethermalization after a short electric field pulse
31.1.2018 11 a.m., room: S-439
Prof. Dr. Ferdi Aryasetiawan (Lund University, Sweden)
Reinterpretation of spectral functions of correlated metals SrVO3 and SrMoO3 according to self-consistent GW+DMFT
7.2.2018 11 a.m., room: S-439
B.Sc. Andreas Weh
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