start-ver=1.4 cd-journal=joma no-vol=96 cd-vols= no-issue=4 article-no= start-page=041106 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2017 dt-pub=201707 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Evolution of the remnant Fermi-surface state in the lightly doped correlated spin-orbit insulator Sr2-xLaxIrO4 en-subtitle= kn-subtitle= en-abstract= kn-abstract= The electronic structure of the lightly electron-doped correlated spin-orbit insulator Sr2IrO4 has been studied by angle-resolved photoelectron spectroscopy. We have observed the coexistence of a lower Hubbard band and an 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 areas, 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. en-copyright= kn-copyright= en-aut-name=TerashimaKensei en-aut-sei=Terashima en-aut-mei=Kensei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SunagawaM. en-aut-sei=Sunagawa en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiwaraH. en-aut-sei=Fujiwara en-aut-mei=H. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=FukuraT. en-aut-sei=Fukura en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=FujiiM. en-aut-sei=Fujii en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=OkadaK. en-aut-sei=Okada en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=HoriganeK. en-aut-sei=Horigane en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=KobayashiK. en-aut-sei=Kobayashi en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=HorieR. en-aut-sei=Horie en-aut-mei=R. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=AkimitsuJ. en-aut-sei=Akimitsu en-aut-mei=J. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= en-aut-name=GoliasE. en-aut-sei=Golias en-aut-mei=E. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=11 ORCID= en-aut-name=MarchenkoD. en-aut-sei=Marchenko en-aut-mei=D. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=12 ORCID= en-aut-name=VarykhalovA. en-aut-sei=Varykhalov en-aut-mei=A. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=13 ORCID= en-aut-name=SainiN. L. en-aut-sei=Saini en-aut-mei=N. L. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=14 ORCID= en-aut-name=WakitaT. en-aut-sei=Wakita en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=15 ORCID= en-aut-name=MuraokaY. en-aut-sei=Muraoka en-aut-mei=Y. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=16 ORCID= en-aut-name=YokoyaT. en-aut-sei=Yokoya en-aut-mei=T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=17 ORCID= affil-num=1 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Natural Sciences, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Natural Sciences, Okayama University kn-affil= affil-num=4 en-affil= kn-affil= affil-num=5 en-affil=Graduate School of Natural Sciences, Okayama University kn-affil= affil-num=6 en-affil=Aoyama Gakuin University kn-affil= affil-num=7 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=8 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=9 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=10 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=11 en-affil=Helmholtz-Zentrum Berlin für Materialien und Energie kn-affil= affil-num=12 en-affil=Helmholtz-Zentrum Berlin für Materialien und Energie kn-affil= affil-num=13 en-affil=Helmholtz-Zentrum Berlin für Materialien und Energie kn-affil= affil-num=14 en-affil=Dipartimento di Fisica, Universitá di Roma “La Sapienza kn-affil= affil-num=15 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=16 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= affil-num=17 en-affil=Research Institute for Interdisciplinary Science, Okayama University kn-affil= END