Electronic Structure of Spin-Orbital-Coupling-Driven Insulator Sr$_2$IrO$_4$ from Angle-Resolved Photoemission Spectroscopy
ORAL
Abstract
Sr$_2$IrO$_4$, as a Mott Insulator, is an ideal system to study spin orbital coupling interaction in transition metal oxides. We report a comprehensive investigation on electronic structure of Sr$_2$IrO$_4$ by high resolution angle-resolved photoemission spectroscopy (ARPES). We measured the Fermi surface and band structures at different photon energies, under different photon polarizations. New features have been revealed that were not observed in previous studies. Moreover, the measurement under different polarizations helps identify different orbital characteristics of bands. The comparison between our experimental observations and theoretical calculation proves the important role of spin-orbital coupling interaction in determining its electron structure. The rich information on the electron structure of Sr$_2$IrO$_4$ will provide key insights in understanding the mechanism of various electron interactions in determining its insulator ground state.
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Authors
Yan Liu
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Xiaowen Jia
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Daixiang Mou
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Lin Zhao
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Junfeng He
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Guodong Liu
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Shaolong He
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Yingying Peng
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Chaoyu Chen
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Xiaoli Dong
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Jun Zhang
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
Zuyan Xu
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Chuangtian Chen
Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Gang Cao
Center for Advanced Materials and Department of Physics and Astronomy, University of Kentucky
X.J. Zhou
The Institute of Physics, CAS
National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics CAS, Beijing 100190, China
