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.

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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

  • Jinsheng Wen

    Brookhaven Natl. Lab., Brookhaven National Lab, Brookhaven National Laboratory, Upton, NY 11973, Brookhaven National Laboratory

  • G.D. Gu

    Brookhaven National Laboratory, Brookhaven Natl. Lab., Brookhaven National Laboratory, Upton, NY 11973