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ICMAB Research

Emergent orbital dynamics in strongly spin-orbit coupled systems
23 February 2026

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.

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Emergent orbital dynamics in strongly spin-orbit coupled systems


Minarro, A. S.; Herranz, G.

Phys. Rev. B 113, 035105
DOI: 10.1103/639b-9j61