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.