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