TY - JOUR
T1 - Fermi surface sheet-dependent band splitting in Sr 2RuO 4 revealed by high-resolution angle-resolved photoemission spectroscopy
AU - Liu, Shanyu
AU - Weng, Hongming
AU - Mou, Daixiang
AU - Zhang, Wentao
AU - Wu, Quansheng
AU - He, Junfeng
AU - Liu, Guodong
AU - Zhao, Lin
AU - Liu, Haiyun
AU - Jia, Xiaowen
AU - Peng, Yingying
AU - He, Shaolong
AU - Dong, Xiaoli
AU - Zhang, Jun
AU - Mao, Z. Q.
AU - Chen, Chuangtian
AU - Xu, Zuyan
AU - Dai, Xi
AU - Fang, Zhong
AU - Zhou, X. J.
PY - 2012/10/10
Y1 - 2012/10/10
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.86.165112
DO - 10.1103/PhysRevB.86.165112
M3 - Article
AN - SCOPUS:84867462915
VL - 86
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 16
M1 - 165112
ER -