Nodal-antinodal dichotomy and the two gaps of a superconducting doped Mott insulator |
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Authors: | Civelli M Capone M Georges A Haule K Parcollet O Stanescu T D Kotliar G |
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Affiliation: | Theory Group, Institut Laue Langevin, Grenoble, France. |
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Abstract: | 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 underdoped 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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