Search for a nematic symmetry in the intra-unit-cell pseudogap states of underdoped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta }$

ORAL

Abstract

We measure the intra-unit-cell pseudogap states (Y. Kohsaka \textit{et al}. \textit{Science} \textbf{315}, 1380 (2007)) in underdoped Bi$_{2}$Sr$_{2}$Ca$_{0.8}$Dy$_{0.2}$Cu$_{2}$O$_{8+\delta }$ ($T_{c}$=50K) using the Spectroscopic Imaging STM, and analyze this state using a local nematic order parameter. We search for the rotational symmetry breaking (nematicity) within each CuO$_{2}$~unit-cell in~ subatomic scale STM data with a particular care in correcting for instrumental drift. We investigate the correlation between this electronic nematicity and pseudogap energy scale.We discuss the relationship between the intra-unit-cell electronic structure and a nematicity.

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Authors

  • K. Fujita

    • LASSP, Dept. of Physics, Cornell U., CMPMS Dept, BNL

  • M.J. Lawler

    • Dept. of Physics, Applied Physics and Astronomy, Binghamton U., LASSP, Dept of Physics, Cornell U.

  • Andrew Schmidt

    • LASSP, Dept. of Physics, Cornell U, CMPMS Department, BNL
    • Cornell University

  • Jhinhwan Lee

    • LASSP, Dept. of Physics, Cornell U., CMPMS Dept., BNL, Dept of Physics, Seoul National U.

  • Chung Koo Kim

    • LASSP, Dept. of Physics, Cornell U, CMPMS Department, BNL

  • Hiroshi Eisaki

    • Institute of Advanced Industrial Science and Technology
    • National Institute of Advanced Industrial Science and Technology

  • S. Uchida

    • Dept. of Physics, U. of Tokyo

  • J.C. Davis

    • Cornell University
    • Cornell University, Brookhaven National Lab, University of St. Andrews
    • Cornell University, University of St. Andrews, Brookhaven National Laboratory
    • Cornell U., BNL, U. of St. Andrews, U. of British Columbia

  • J.P. Sethna

    • LASSP, Dept. of Physics, Cornell University

  • Eun-Ah Kim

    • Cornell University
    • Cornell Univerisity
    • LASSP, Dept. of Physics, Cornell U.