Electronic structure has been studied in lightly electron doped correlated spin-orbit insulator Sr2IrO4 by angle-resolved photoelectron spectroscopy. We have observed coexistence of the lower Hubbard band and the in-gap band, the momentum dependence of the latter traces that of the band calculations without on-site Coulomb repulsion. The in-gap state remained anisotropically gapped in all observed momentum area, forming a remnant Fermi surface state, evolving towards the Fermi energy by carrier doping. These experimental results show a striking similarity with those observed in deeply underdoped cuprates, suggesting the common nature of the nodal liquid states observed in both compounds.
@article{arxiv.1706.07947,
title = {Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator Sr$_{2-x}$La$_x$IrO$_4$},
author = {K. Terashima and M. Sunagawa and H. Fujiwara and T. Fukura and M. Fujii and K. Okada and K. Horigane and K. Kobayashi and R. Horie and J. Akimitsu and E. Golias and D. Marchenko and A. Varykhalov and N. L. Saini and T. Wakita and Y. Muraoka and T. Yokoya},
journal= {arXiv preprint arXiv:1706.07947},
year = {2017}
}
Comments
6 pages, 5 figures + Supplemental Material(4 pages, 5 figures), accepted for publication in PRB