Universal High Energy Anomaly in the Angle-Resolved Photoemission Spectra of High Temperature Superconductors: Possible Evidence of Spinon and Holon Branches

J. Graf, G.-H. Gweon, K. McElroy, S. Y. Zhou, C. Jozwiak, E. Rotenberg, A. Bill, T. Sasagawa, H. Eisaki, S. Uchida, H. Takagi, D.-H. Lee, and A. Lanzara
Phys. Rev. Lett. 98, 067004 – Published 7 February 2007

Abstract

A universal high energy anomaly in the single particle spectral function is reported in three different families of high temperature superconductors by using angle-resolved photoemission spectroscopy. As we follow the dispersing peak of the spectral function from the Fermi energy to the valence band complex, we find dispersion anomalies marked by two distinctive high energy scales, E10.38eV and E20.8eV. E1 marks the energy above which the dispersion splits into two branches. One is a continuation of the near parabolic dispersion, albeit with reduced spectral weight, and reaches the bottom of the band at the Γ point at 0.5eV. The other is given by a peak in the momentum space, nearly independent of energy between E1 and E2. Above E2, a bandlike dispersion reemerges. We conjecture that these two energies mark the disintegration of the low-energy quasiparticles into a spinon and holon branch in the high Tc cuprates.

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  • Received 25 May 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.067004

©2007 American Physical Society

Authors & Affiliations

J. Graf1,2, G.-H. Gweon3,4, K. McElroy1, S. Y. Zhou3, C. Jozwiak3, E. Rotenberg5, A. Bill3, T. Sasagawa6,7, H. Eisaki8, S. Uchida9, H. Takagi6,7,10, D.-H. Lee1,3, and A. Lanzara1,3,*

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 2Swiss Federal Institute of Technology Lausanne, CH-1015, Lausanne, Switzerland
  • 3Department of Physics, University of California Berkeley, Berkeley, California 94720, USA
  • 4Department of Physics, University of California Santa Cruz, Santa Cruz, California 95064, USA
  • 5Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 7CREST, Japan Science and Technology Agency, Saitama 332-0012, Japan
  • 8AIST, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki, 305-8568, Japan
  • 9Department of Physics, University of Tokyo, Yayoi, 2-11-16 Bunkyoku, Tokyo 113-8656, Japan
  • 10RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan

  • *Electronic address: alanzara@lbl.gov

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Vol. 98, Iss. 6 — 9 February 2007

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