Proximity of the Superconducting Dome and the Quantum Critical Point in the Two-Dimensional Hubbard Model

Abstract

We use the dynamical cluster approximation to understand the proximity of the superconducting dome to the quantum critical point in the two-dimensional Hubbard model. In a BCS formalism, $T_c$ may be enhanced through an increase in the d-wave pairing interaction ($V_d$) or the bare pairing susceptibility (${\chi }_{0d}$). At optimal doping, where $V_d$ is revealed to be featureless, we find a power-law behavior of ${\chi }_{0d}(\omega =0)$, replacing the BCS log, and strongly enhanced $T_c$. We suggest experiments to verify our predictions.

5 pages, 4 figures, published on PRL

References in corpus (3)

• Systematic analysis of a spin-susceptibility representation of the pairing interaction in the 2D Hubbard model
• Thermodynamics of the Quantum Critical Point at Finite Doping in the 2D Hubbard Model: A Dynamical Cluster Approximation Study
• Avoided Quantum Criticality near Optimally Doped High Temperature Superconductors

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