title: Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr(2)IrO(4).
abstract: We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet (Sr(1-x)La(x))(2)IrO(4). For a doping level of x=0.05, we find an unusual metallic state with coherent nodal excitations and an antinodal pseudogap bearing strong similarities with underdoped cuprates. This state emerges from a rapid collapse of the Mott gap with doping resulting in a large underlying Fermi surface that is backfolded by a (π,π) reciprocal lattice vector which we attribute to the intrinsic structural distortion of Sr(2)IrO(4).
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: de la Torre
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: McKeown Walker
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: F Y
authors.initials: FY
authors.lastname: Bruno
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Riccó
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.|Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: I
authors.initials: I
authors.lastname: Gutierrez Lezama
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Scheerer
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: G
authors.initials: G
authors.lastname: Giriat
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Jaccard
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Berthod
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom.
authors.forename: T K
authors.initials: TK
authors.lastname: Kim
authors.affiliation: Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Hoesch
authors.affiliation: School of Physics and Astronomy, The University of Edinburgh, James Clerk Maxwell Building, Mayfield Road, Edinburgh EH9 2TT, United Kingdom.
authors.forename: E C
authors.initials: EC
authors.lastname: Hunter
authors.affiliation: London Centre for Nanotechnology and UCL Centre for Materials Discovery, University College London, London WC1E 6BT, United Kingdom.
authors.forename: R S
authors.initials: RS
authors.lastname: Perry
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Tamai
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland.|Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.|SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom.
authors.forename: F
authors.initials: F
authors.lastname: Baumberger