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, 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
TL;DR
This study uses laser-based ARPES to investigate high energy electron dynamics in Bi2Sr2CaCu2O8, revealing new insights into high energy kinks and dispersions, and highlighting discrepancies between different measurement methods.
Contribution
It provides new momentum-dependent insights into high energy kinks and discusses the origin of band structure features, emphasizing the impact of measurement techniques.
Findings
Identification of high energy kink at 200-400 meV
Discovery of dichotomy between MDC- and EDC-derived bands
Highlighting measurement artifacts affecting high energy features
Abstract
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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