SIMES Seminar – Andrzej Oleś

Date(s) - Jul 9 2018
11:00 AM - 12:00 PM

Room 335, McCullough Building


Fingerprints of Spin-Orbital Entanglement in Transition Metal Oxides

Andrzej M. Oleś 1,2
1 Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
2 Max Planck Institute for Solid State Research, Heisenbergstrasse 1, Stuttgart, Germany

Spin-orbital superexchange models describe the low-energy degrees of freedom in Mott insulators and lead in general to entangled states [1]. They provide a theoretical framework for describing magnetic and optical properties of Mott insulators [2]. Several examples of spin-orbital entanglement (SOE) [1] in models with intrinsically frustrated interactions are discussed. SOE concerns in general not only ground but also excited states and we suggest that it plays a role in some but not all quantum phase transition [3]. Finally, we show that SOE plays a role in doped systems [4] and highlight interesting topological states that emerge from spin-orbital physics [5].
[1] A. M. Oleś, Journal of Physics: Condensed Matter 24, 313201 (2012).
[2] G. Khaliullin, P. Horsch, and A.M. Oleś , Phys. Rev. B 70, 195103 (2004).
[3] W.-L. You, P. Horsch, and A. M. Oleś, New J. Phys. 17, 083009 (2015).
[4] W. Brzezicki, A. M. Oleś, and M. Cuoco, Phys. Rev. X 5, 011037 (2015).
[5] W. Brzezicki, A. M. Oleś, and M. Cuoco, Phys. Rev. B 95, 140506® (2017).