Fermi surface sheet-dependent band splitting in Sr 2RuO 4 revealed by high-resolution angle-resolved photoemission spectroscopy

Shanyu Liu, Hongming Weng, Daixiang Mou, Wentao Zhang, Quansheng Wu, Junfeng He, Guodong Liu, Lin Zhao, Haiyun Liu, Xiaowen Jia, Yingying Peng, Shaolong He, Xiaoli Dong, Jun Zhang, Z. Q. Mao, Chuangtian Chen, Zuyan Xu, Xi Dai, Zhong Fang, X. J. Zhou

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High-resolution angle-resolved photoemission measurements have been carried out on Sr 2RuO 4. We observe clearly two sets of Fermi surface sheets near the (π,0)-(0,π) line, which are most likely attributed to the surface and bulk Fermi surface splitting of the β band. This is in strong contrast to the nearly null surface and bulk Fermi surface splitting of the α band, although both have identical orbital components. Extensive band structure calculations are performed by considering various scenarios, including structural distortion, spin-orbit coupling, and surface ferromagnetism. However, none of them can explain such a qualitative difference of the surface and bulk Fermi surface splitting between the α and β sheets. This unusual behavior points to an unknown order on the surface of Sr 2RuO 4 that remains to be uncovered. Its revelation will be important for studying and utilizing novel quantum phenomena associated with the surface of Sr 2RuO 4 as a result of its being a possible p-wave chiral superconductor and a topological superconductor.

Original languageEnglish (US)
Article number165112
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number16
Publication statusPublished - Oct 10 2012


All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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