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
DOI 10.1103/PhysRevLett.100.046402 · Physical Review Letters
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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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