Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator Sr${}_{2-x}$La${}_x$IrO${}_4$

Abstract

Electronic structure has been studied in lightly electron doped correlated spin-orbit insulator Sr${}_2$IrO${}_4$ 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.

6 pages, 5 figures + Supplemental Material(4 pages, 5 figures), accepted for publication in PRB

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Cited by in corpus (5)

• Square Lattice Iridates
• Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4
• Spectral functions of Sr${}_2$IrO${}_4$: theory versus experiment
• Spectroscopic evidence for electron-boson coupling in electron-doped Sr${}_2$IrO${}_4$
• Anomalous Nodal Gap in a Doped Spin-1/2 Antiferromagnetic Mott Insulator