Seminarium Fizyki Materii Skondensowanej
sala 0.03a, ul. Pasteura 5
2015-05-15 (12:15) 
prof. Andrzej M. Oleś (Jagiellonian University Kraków; Max Planck Stuttgart)
Frustration and Entanglement in Spin-Orbital Models: Spin-Orbital Order in Systems with Orbital Dilution
Entanglement in the theory of condensed matter occurs for spin-orbital superexchange [1]. Inter alia, it leads to a cute and surprising rigorous topological order in the SU(2)⊗XY spin-orbital ring [2]. In doped Mott insulators spin-orbital order ia locally or even globally changed when a host with 4d4 ions and S = 1 spins is doped by 3d3 magnetic impurities with S = 3/2 spins (orbital dilution [3]). Frustration of spin- orbital interactions and the role of quantum fluctuations will be discussed.[1] Andrzej M. Oleś, J. Phys.: Condensed Matter 24, 313201 (2012). [2] W. Brzezicki, J. Dziarmaga, and A.M. Oleś, Phys. Rev. Lett. 112,117204 (2014). [3] W. Brzezicki, A.M. Oleś, and M. Cuoco, Phys. Rev. X 5, 011037 (2015).