ICMAB Research
A new paper has been published in Physical Review B:
The interplay between spin and orbital degrees of freedom gives rise to a variety of emergent phases in correlated 4d and 5d transition-metal systems. Among these materials, it is known that strong spin–orbit coupling (SOC) significantly alters Jahn-Teller (JT) effects, either by suppressing static distortions or promoting dynamic fluctuations, so that orbital polarization related to JT effects is reduced or even quenched. Here, by using a Matsubara lattice formalism, we investigate how orbital fluctuations are generated and propagated by local perturbations in spin-orbit coupled systems with no global polarization, corresponding to either orbitally disordered phases or dynamic JT regimes. By analyzing how such perturbations propagate through the correlated, spin-orbit-entangled ground state, we observe that they generate short-range orbital fluctuations that carry local polarization. We find that these dynamical fluctuations propagate to neighboring sites with a polarization orthogonal to the initial perturbation. Finally, we discuss to what extent such orbital fluctuations may be probed as excitations in spectroscopic measurements.
M4ELC Sustainable Electronics
Emergent orbital dynamics in strongly spin-orbit coupled systems
Minarro, A. S.; Herranz, G.
DOI: 10.1103/639b-9j61


