Anisotropic phonon anomaly in Bi2212 manifested by electron-phonon coupling
ORAL
Abstract
Electron-phonon coupling (EPC) is one of the important issues in condensed matter physics. Angle-resolved photoemission spectroscopy has been recognized as a powerful tool for the study of EPC by determining the renormalization of electron self energy. For the phonon counterpart, we measure the momentum-dependent phonon spectra of an optimal doped cuprate Bi2212 with high-resolution electron energy loss spectroscopy. The apical oxygen vibration mode at 80 meV exhibits distinct anisotropic anomaly due to EPC. By analyzing the phonon lifetime, the momentum-dependent EPC strength is determined with the knowledge of electron band structure. It is emphasized that the combination of analyses of phonon and electron structures leads to an unambiguous and comprehensive description of EPC.
*This work was supported by China NSF (10704084) and ``973'' Program (2006CB921300 and 2007CB936800).
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Authors
Jiandong Guo
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Institute of Physics, Chinese Academy of Sciences
Huajun Qin
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Junren Shi
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Yanwei Cao
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Kehui Wu
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Institute of Physics, Chinese Academy of Sciences
Jiandi Zhang
Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA, 70803
Louisiana State University, Baton Rouge, LA 70808
E. Ward Plummer
Department of physics and Astronomy, Louisiana State University
Louisiana State University
Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA, 70803
Louisiana State University, Baton Rouge, LA 70808
Dept of Physics and Astronomy, Louisiana State University
