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

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

2007-04-11

arxiv.org/abs/0704.1486v3

Phys. Rev. Lett. 100, 046402 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Corrected typos, 4.5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.100.046402

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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