Center for Artificial Low Dimensional Electronic Systems

“Spin-Orbital Entanglement and Novel Phases in Mott Insulators”

Dr. G. Jackeli(MPI-FKF and University of Stuttgart, Germany)

April 9(Tue) - April 9(Tue), 2019

15:00

Seminar Room #201, Science building #3

In d1 Mott insulators, the spin-orbit coupling (SOC) stabilizes jeff=3/2 quartet of an effective total angular momentum and allows for the emergence of multi-orbital physics and related spin-orbital frustration. Considering molybdenum, and osmium double perovskites as examples, I will discuss how resulting spin-orbital interplay can give rise to a host of novel quantum phases that includes multipolar order, non-collinear spin patterns, and nonmagnetic disordered valence bond states [1]. Next, I will present an example of a honeycomb lattice d1 compound, such as zirconium trichloride, in which, paradoxically, the strong SOC enhances the symmetry of spin-orbital space to emergent SU(4) symmetric couplings [2] that in turn may lead to a spin-orbital liquid state.