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, Zhiqiang Mao, Chuangtian Chen, Zuyan Xu, Xi Dai, Zhong Fang, X. J. Zhou

Research output: Contribution to journalArticle

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Abstract

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
Volume86
Issue number16
DOIs
StatePublished - Oct 10 2012

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Fermi surface
Photoelectron spectroscopy
Fermi surfaces
photoelectric emission
high resolution
spectroscopy
Superconducting materials
Ferromagnetism
Photoemission
Band structure
ferromagnetism
Orbits
orbits
orbitals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Liu, Shanyu ; Weng, Hongming ; Mou, Daixiang ; Zhang, Wentao ; Wu, Quansheng ; He, Junfeng ; Liu, Guodong ; Zhao, Lin ; Liu, Haiyun ; Jia, Xiaowen ; Peng, Yingying ; He, Shaolong ; Dong, Xiaoli ; Zhang, Jun ; Mao, Zhiqiang ; Chen, Chuangtian ; Xu, Zuyan ; Dai, Xi ; Fang, Zhong ; Zhou, X. J. / Fermi surface sheet-dependent band splitting in Sr 2RuO 4 revealed by high-resolution angle-resolved photoemission spectroscopy. In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 16.
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abstract = "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.",
author = "Shanyu Liu and Hongming Weng and Daixiang Mou and Wentao Zhang and Quansheng Wu and Junfeng He and Guodong Liu and Lin Zhao and Haiyun Liu and Xiaowen Jia and Yingying Peng and Shaolong He and Xiaoli Dong and Jun Zhang and Zhiqiang Mao and Chuangtian Chen and Zuyan Xu and Xi Dai and Zhong Fang and Zhou, {X. J.}",
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Liu, S, Weng, H, Mou, D, Zhang, W, Wu, Q, He, J, Liu, G, Zhao, L, Liu, H, Jia, X, Peng, Y, He, S, Dong, X, Zhang, J, Mao, Z, Chen, C, Xu, Z, Dai, X, Fang, Z & Zhou, XJ 2012, 'Fermi surface sheet-dependent band splitting in Sr 2RuO 4 revealed by high-resolution angle-resolved photoemission spectroscopy', Physical Review B - Condensed Matter and Materials Physics, vol. 86, no. 16, 165112. https://doi.org/10.1103/PhysRevB.86.165112

Fermi surface sheet-dependent band splitting in Sr 2RuO 4 revealed by high-resolution angle-resolved photoemission spectroscopy. / Liu, Shanyu; Weng, Hongming; Mou, Daixiang; Zhang, Wentao; Wu, Quansheng; He, Junfeng; Liu, Guodong; Zhao, Lin; Liu, Haiyun; Jia, Xiaowen; Peng, Yingying; He, Shaolong; Dong, Xiaoli; Zhang, Jun; Mao, Zhiqiang; Chen, Chuangtian; Xu, Zuyan; Dai, Xi; Fang, Zhong; Zhou, X. J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 16, 165112, 10.10.2012.

Research output: Contribution to journalArticle

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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, Zhiqiang

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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