Superconducting Gap in the Hubbard Model and the Two-Gap Energy Scales of High-Tc Cuprate Superconductors
M. Aichhorn, E. Arrigoni, Z. B. Huang, W. Hanke
DOI 10.1103/PhysRevLett.99.257002 · Physical Review Letters
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Abstract
Recent experiments (angle-resolved photoemission spectroscopy and Raman) suggest the presence of two distinct energy gaps in high-temperature superconductors (HTSC), exhibiting different doping dependences. The results of a variational cluster approach to the superconducting state of the two-dimensional Hubbard model are presented which show that this model qualitatively describes this gap dichotomy. The antinodal gap increases with less doping, a behavior long considered as reflecting the general gap behavior of the HTSC. On the other hand, the near-nodal gap does even slightly decrease with underdoping. An explanation of this unexpected behavior is given which emphasizes the crucial role of spin fluctuations in the pairing mechanism.
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