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High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission

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arxiv 0801.2824 v1 pith:WEWRTI44 submitted 2008-01-18 cond-mat.supr-con

High Energy Dispersions in Bi2Sr2CaCu2O8 High Temperature Superconductor from Laser-Based Angle-Resolved Photoemission

Wentao Zhang , Guodong Liu , Jianqiao Meng , Lin Zhao , Haiyun Liu , Xiaoli Dong , Wei Lu , J. S. Wen
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Z. J. Xu G. D. Gu T. Sasagawa Guiling Wang Yong Zhu Hongbo Zhang Yong Zhou Xiaoyang Wang Zhongxian Zhao Chuangtian Chen Zuyan Xu X. J. Zhou
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classification cond-mat.supr-con
keywords highenergyangle-resolvedbandbi2sr2cacu2o8dispersionsintrinsiclaser-based
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Super-high resolution laser-based angle-resolved photoemission (ARPES) measurements have been carried out on the high energy electron dynamics in Bi2Sr2CaCu2O8 (Bi2212) high temperature superconductor. Momentum dependent measurements provide new insights on the nature of high energy kink at 200~400 meV and high energy dispersions. The strong dichotomy between the MDC- and EDC-derived bands is revealed which raises critical issues about its origin and which one represents intrinsic band structure. The MDC-derived high energy features are affected by the high-intensity valence band at higher binding energy and may not be intrinsic.

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