Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$

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

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Polarization Selection Rules and Superconducting Gap Anisotropy in $Bi_2Sr_2CaCu_2O_8$

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arxiv cond-mat/9507021 v1 pith:XB5F5SES submitted 1995-07-07 cond-mat supr-con

M.R. Norman , M. Randeria , H. Ding , J.C. Campuzano , A.F. Bellman This is my paper

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keywords bandpolarizationrulesselectionsuperconductingangle-resolvedanisotropyarising

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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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