Condensed Matter Physics Seminar
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2017-10-13 (Friday)
room 1.02, Pasteura 5 at 12:15 
Wojciech Brzezicki (IF PAN)Exotic topological states in hybrid transition metal oxides
The interplay between localized 3d and more delocalized 4d states in hybrid transition metal oxides tunes the competition between metallic and insulating states. For instance, doping of the 3d^3/3d^2 ions in the 4d^4 host realizes orbital/charge doping scenario. For the d^3 doping the competition between localized antiferromagnetism and itinerantferromagnetism can lead to one-dimensional (1D) zigzag magnetic structures whose non-symmorphic symmetries stabilize exotic Dirac semi-metal phases with multiple topological protection. On the other hand the d^2 doping in the d^4 system leads to a pairing mechanism and effective non-uniform Kitaev model in 1D, with hidden Lorentzsymmetry and hosting topological phases even in disordered cases.