Hamburg Photon Science Colloquium | Triplon topology and triplon liquid in excitonic magnets

by Maria Daghofer (Institut für Funktionelle Materie und Quantentechnologien, Universität Stuttgart)

Friday 16 Nov 2018, 14:00 → 15:30 Europe/Berlin

CFEL SR I-III (Bldg. 99) (DESY, Hamburg)

The combination of strong spin-orbit coupling and correlations, e.g. in ruthenates and iridates, has been proposed as a means to realize quantum materials with non-trivial topological properties, e.g., Kitaev‘s spin liquid in materials with a honeycomb lattice and one hole in the t_2g subshell of 4d or 5d states. We discuss here two holes in the t_2g subshell, where onsite spin-orbit coupling favors a local singlet ground state. We investigate excitations into a low-lying triplet, triplons, and find them to aquire non-trivial band topology in large parts of the parameter space. We also comment on the magnetic states resulting from triplon condesation where we find a triplon liquid taking the parameter space of Kitaev‘s spin liquid.