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ARPES measurements of the Fermi surface and anisotropic superconducting gap. a) A recent ARPES determination of the Fermi surface of Bi2Sr2CaCu2O8+δ (Bi2212), the surface in momentum space (Kx, Ky) that marks the boundary between filled and empty states. Recent improvements in resolution now show that the Fermi surface consists of two concentric hole-like cylinders because the unit cell of this crystal structure contains a pair of CuO2 sheets94. b) The difference in the size of the superconducting gap at two different locations A and B on the Fermi surface. In the Γ-M direction (Cu–O bond direction) a large gap in the density of states opens at the Fermi surface, but in the Γ-Y direction 45 degrees away from this, no gap is seen.

Description	ARPES measurements of the Fermi surface and anisotropic superconducting gap.
Source	Nature physics VOL 2 MARCH 2006, pUblished by Douglas Bonn
Date	2007-09-14
Author	Author of the nature-physics publication : Douglas Bonn Original author of the picture: Zhi-xun Shen
Permission (Reusing this image)	CC-BY-SA original, given directly by both, Douglas Bonn and Zhi-xun Shen.

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	Date/Time	Dimensions	User	Comment
current	18:18, 14 September 2007	1,044×536 (53 KB)	Neburzaragoza (Talk \| contribs)	(ARPES measurements of the Fermi surface and anisotropic superconducting gap. a) A recent ARPES determination of the Fermi surface of Bi2Sr2CaCu2O8+δ (Bi2212), the surface in momentum space (Kx, Ky) that marks the boundary between filled and empty states)