We use a three-pulse ultrafast optical spectroscopy to study the relaxation processes in a frustrated Mott insulator Na2IrO3. By being able to independently produce the out-of-equilibrium bound states (excitons) of doublons and holons with the first pulse and suppress the underlying antiferromagnetic order with the second one, we were able to elucidate the relaxation mechanism of quasiparticles in this system. By observing the difference in the exciton dynamics in the magnetically ordered and disordered phases we found that the mass of this quasiparticle is mostly determined by its interaction with the surrounding spins.
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This work was supported by Army Research Office Grant No. W911NF-15-1-0128 and Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4540 (time resolved optical spectroscopy), Skoltech, as part of the Skoltech NGP program (theory) and National Science Foundation Grant No. DMR-1265162 (material growth).
See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevB.96.235141 for the discussion of the effects of the push pulse.
Alpichshev, Zhanybek; Sie, Edbert J.; Mahmood, Fahad; Cao, Gang; and Gedik, Nuh, "Origin of the Exciton Mass in the Frustrated Mott Insulator Na2IrO3" (2017). Physics and Astronomy Faculty Publications. 524.