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Bulletin of the American Physical Society

Na$_2$IrO$_3$ as a Novel Relativistic Mott Insulator with a 340\,meV Gap

Riccardo Comin, G. Levy, I. S. Elfimov, A. Damascelli, D. Stricker, Jason Hancock, D. van der Marel, Yogesh Singh, P. Gegenwart

Published Mar 18, 2013• 10 citations
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Na2_22​IrO3_33​ as a Novel Relativistic Mott Insulator with a 340\,meV Gap
The Mott Insulating Nature of Na2_{\mathrm{2}}2​IrO3_{\mathrm{3}}3​ : DFT+++DMFT Study
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We use a three-pulse ultrafast optical spectroscopy to study the relaxation processes in a frustrated Mott insulator Na[subscript 2]IrO[subscript 3]. 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.