Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet

• Published in: Science (American Association for the Advancement of Science) Vol. 345; no. 6193; pp. 187 - 190
• Main Authors: Kim, Y. K., Krupin, O., Denlinger, J. D., Bostwick, A., Rotenberg, E., Zhao, Q., Mitchell, J. F., Allen, J. W., Kim, B. J.
• Format: Journal Article
• Language: English
• Published: Washington American Association for the Advancement of Science 11-07-2014; The American Association for the Advancement of Science; AAAS
• Subjects: Antinodes; ARCS; Brillouin zones; Carrier density; COPPER OXIDE; Cuprates; DENSITY; Dichroism; DOPING; ELECTRICAL CONDUCTIVITY; Electrical phases; Electron states; Ferroelectrics; Heisenberg antiferromagnets; High temperature superconductors; MAGNETIC PROPERTIES; MAGNETS; Materials; Materials science; Phenomenology; Physics; Spectroscopic analysis; Spectroscopy; Spectrum analysis; Superconductivity; Temperature dependence
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.1251151

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.