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arxiv 0704.1486 v3 pith:5DZ6P4CW submitted 2007-04-11 cond-mat.str-el

Nodal/Antinodal Dichotomy and the Two Gaps of a Superconducting Doped Mott Insulator

M. Civelli , M. Capone , A. Georges , K. Haule , O. Parcollet , T. D. Stanescu , G. Kotliar This is my paper
classification cond-mat.str-el
keywords antinodalmottnodalself-energysuperconductingadditionalanomalousapproached
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the superconducting state of the hole-doped two-dimensional Hubbard model using Cellular Dynamical Mean Field Theory, with the Lanczos method as impurity solver. In the under-doped regime, we find a natural decomposition of the one-particle (photoemission) energy-gap into two components. The gap in the nodal regions, stemming from the anomalous self-energy, decreases with decreasing doping. The antinodal gap has an additional contribution from the normal component of the self-energy, inherited from the normal-state pseudogap, and it increases as the Mott insulating phase is approached.

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