title: High energy dispersion relations for the high temperature Bi2Sr2CaCu2O8 superconductor from laser-based angle-resolved photoemission spectroscopy.
abstract: Laser-based angle-resolved photoemission spectroscopy measurements have been carried out on the high energy electron dynamics in Bi2Sr2CaCu2O8 high temperature superconductor. Our superhigh resolution data, momentum-dependent measurements, and complete analysis provide important information to judge the nature of the high energy dispersion and kink. Our results rule out the possibility that the high energy dispersion from the momentum distribution curve (MDC) may represent the true bare band as believed in previous studies. We also rule out the possibility that the high energy kink represents electron coupling with some high energy modes as proposed before. Through detailed MDC and energy distribution curve analyses, we propose that the high energy MDC dispersion may not represent intrinsic band structure.
authors.affiliation: National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhang
authors.forename: Guodong
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authors.lastname: Liu
authors.forename: Jianqiao
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authors.lastname: Meng
authors.forename: Lin
authors.initials: L
authors.lastname: Zhao
authors.forename: Haiyun
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authors.lastname: Dong
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authors.lastname: Sasagawa
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authors.lastname: Wang
authors.forename: Yong
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authors.lastname: Zhu
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Xiaoyang
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authors.lastname: Wang
authors.forename: Zhongxian
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authors.lastname: Zhao
authors.forename: Chuangtian
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authors.lastname: Chen
authors.forename: Zuyan
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authors.lastname: Xu
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou