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, and G. Kotliar

Phys. Rev. Lett. 100, 046402 – Published 28 January 2008

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.

Received 15 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.046402

Authors & Affiliations

M. Civelli¹, M. Capone², A. Georges³, K. Haule⁴, O. Parcollet⁵, T. D. Stanescu⁶, and G. Kotliar⁴

¹Theory Group, Institut Laue Langevin, Grenoble, France
²SMC, CNR-INFM, and Physics Department, University of Rome “La Sapienza,” Piazzale Aldo Moro 5, I-00185, Rome, Italy and ISC-CNR, Via dei Taurini 19, I-00185, Rome, Italy
³Centre de Physique Théorique, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
⁴Physics Department and Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854-8019, USA
⁵Service de Physique Théorique, CEA/DSM/SPhT-CNRS/SPM/URA 2306 CEA-Saclay, F-91191 Gif-sur-Yvette, France
⁶Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA

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Vol. 100, Iss. 4 — 1 February 2008

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