Accueil du site > Séminaires > Spin-orbital entangled states in correlated j=3/2 systems
Mardi 9 mars, 2021 - 14:00
George Jackeli (MPI-FKF ет U. Stuttgart) - en visio
par
- 9 mars 2021
In late transition metal ions with one electron in a d-shall, the spin-orbit coupling (SOC) stabilizes j=3/2 quartet of an effective total angular momentum and allows for the emergence of the multi-orbital physics and related spin-orbital frustration.
The aim of this talk is to present our work performed along this line. More specifically, I will show that in a thin film of double perovskite Sr2FeMoO6, strong SOC could give rise to a robust ferrimagnetic state with an emergent spin-polarized electronic structure consisting of flat bands and four massive or massless Dirac dispersions, with an interesting response to the applied magnetic field [1].
Next, considering Mott insulators, molybdenum and osmium double perovskites, as examples, I discuss how resulting spin-orbital frustration can lead to a host of quantum phases that includes unusual ordered patterns and nonmagnetic disordered valence bond states [2]. Finally, I present an example of a honeycomb lattice j=3/2 system, such as zirconium trichloride, in which, paradoxically, the strong SOC enhances the symmetry of spin-orbital space to emergent SU(4) symmetric couplings [3].
[1] M. G. Yamada, & G. Jackeli, Phys. Rev. Materials 4, 074007 (2020).
[2] J. Romhányi, L. Balents, & G. Jackeli, Phys. Rev. Lett. 118, 217202 (2017).
[3] M. G. Yamada, M. Oshikawa, & G. Jackeli, Phys. Rev. Lett. 121, 217202 (2018).
Post-scriptum :
contact : R. Ramazashvili