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

TitleNodal-Antinodal Dichotomy and the Two Gaps of a Superconducting Doped Mott Insulator
Publication TypeJournal Article
Year of Publication2008
AuthorsM. Civelli, M. Capone, A. Georges, K. Haule, O. Parcollet, T. D. Stanescu, and G. Kotliar
JournalPhys. Rev. Lett.
Volume100
Pagination5
Date Publishedjan
ISSN0031-9007
Keywords2008, No Fellows
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 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.

URLhttp://arxiv.org/abs/0704.1486