Abstract
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.
Document Type
Article
Publication Date
12-26-2017
Digital Object Identifier (DOI)
https://doi.org/10.1103/PhysRevB.96.235141
Funding Information
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).
Related Content
See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevB.96.235141 for the discussion of the effects of the push pulse.
Repository Citation
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.
https://uknowledge.uky.edu/physastron_facpub/524
Supplemental Material
Notes/Citation Information
Published in Physical Review B, v. 96, issue 23, 235141, p. 1-5.
©2017 American Physical Society
The copyright holder has granted permission for posting the article here.