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Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$

M. R. Norman·M. Randeria·H. Ding·J. C. Campuzano·A. F. Bellman
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Abstract

We discuss polarization selection rules for angle-resolved photoemission spectroscopy in Bi2212. Using these we show that the ``hump'' in the superconducting gap observed in the $X$ quadrant in our earlier work is not on the main $CuO_2$ band, but rather on an umklapp band arising from the structural superlattice. The intrinsic gap is most likely quite small over a range of $\pm 10^\circ$ about the diagonal directions.

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M. R. Norman, M. Randeria, H. Ding, J. C. Campuzano, A. F. Bellman. 1995-07-07. Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$. https://doi.org/10.1103/physrevb.52.15107

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