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- Canadian Institute for Advanced ResearchCA270 papers
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14 papers · 1 filter
Two-particle self-consistent approximation, pseudogap and superconductivity in the attractive Hubbard model
Steve Allen
In this thesis, I present a non-perturbative approach to the single-band attractive Hubard model which is an extension of previous work by Vilk and Tremblay on the repulsive model.…
Non-perturbative approach to the attractive Hubbard model
S. Allen, A. -M. S. Tremblay
A non-perturbative approach to the single-band attractive Hubbard model is presented in the general context of functional derivative approaches to many-body theories. As in previou…
Pairing fluctuations and pseudogaps in the attractive Hubbard model
B. Kyung, S. Allen, A. -M. S. Tremblay
The two-dimensional attractive Hubbard model is studied in the weak to intermediate coupling regime by employing a non-perturbative approach. It is first shown that this approach i…
A strong-coupling expansion for the Hubbard model
N. Dupuis, S. Pairault
We reconsider the strong-coupling expansion for the Hubbard model recently introduced by Sarker and Pairault {\it et al.} By introducing slave particles that act as projection oper…
Conjectures for the microscopic theory of high temperature superconductivity
Bumsoo Kyung
Based on experimental results and our previous theoretical work, a microscopic theory of high temperature superconductivity is conjectured. In this conjecture, superconducting and…
New interpretation of slave boson mean-field theory of the model: short-range antiferromagnetic and d-wave pairing correlations
Bumsoo Kyung
The Hamiltonian is studied in a mean-field approximation by taking into account antiferromagnetic and d-wave pairing correlations. Considering the presence of antiferromagnet…