Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator with a 350 meV gap

Details Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator with a 350 meV gap Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator with a 350 meV gap

2012-04-19

arxiv.org/abs/1204.4471v1

Physics

Condensed Matter

Strongly Correlated Electrons

related material can be found at: http://www.phas.ubc.ca/~quantmat/ARPES/PUBLICATIONS/articles.html

Scientific paper

We study Na2IrO3 by angle-resolved photoemission spectroscopy and in situ carrier doping via potassium deposition. From the K-induced chemical potential shift and the emergence of spectral weight across the insulating gap, together with complementary optical conductivity data, we estimate an optical gap Delta_eff=350 meV. By performing local-density approximation (LDA) band structure calculations, with the inclusion of spin-orbit coupling (SO) and Coulomb repulsion U, we determine that while the correct gap magnitude can only be reproduced by LDA+SO+U, the prodromes of an underlying insulating state are already found in LDA+SO. This challenges a simple Mott-Hubbard scenario, establishing Na2IrO3 as a spin-orbit-assisted antiferromagnetic insulator.

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