title: Superconductivity. Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet.
abstract: High-temperature superconductivity in cuprates arises from an electronic state that remains poorly understood. We report the observation of a related electronic state in a noncuprate material, strontium iridate (Sr2IrO4), in which the distinct cuprate fermiology is largely reproduced. Upon surface electron doping through in situ deposition of alkali-metal atoms, angle-resolved photoemission spectra of Sr2IrO4 display disconnected segments of zero-energy states, known as Fermi arcs, and a gap as large as 80 millielectron volts. Its evolution toward a normal metal phase with a closed Fermi surface as a function of doping and temperature parallels that in the cuprates. Our result suggests that Sr2IrO4 is a useful model system for comparison to the cuprates.
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Y K
authors.initials: YK
authors.lastname: Kim
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: O
authors.initials: O
authors.lastname: Krupin
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: J D
authors.initials: JD
authors.lastname: Denlinger
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: A
authors.initials: A
authors.lastname: Bostwick
authors.affiliation: Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: E
authors.initials: E
authors.lastname: Rotenberg
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA.
authors.forename: J F
authors.initials: JF
authors.lastname: Mitchell
authors.affiliation: Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: J W
authors.initials: JW
authors.lastname: Allen
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA. Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109, USA. Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany. bjkim@fkf.mpg.de.
authors.forename: B J
authors.initials: BJ
authors.lastname: Kim