Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-01-06
Phys. Rev. B 73, 214510 (2006); Phys. Rev. B 76, 139902(E) (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, a sign error in Eq.(3) has been corrected and its consequence has been discussed with updated figures
Scientific paper
10.1103/PhysRevB.73.214510
We present a controlled perturbative approach to the low temperature phase diagram of highly inhomogeneous Hubbard models in the limit of small coupling, $t'$, between clusters. We apply this to the dimerized and checkerboard models. The dimerized model is found to behave like a doped semiconductor, with a Fermi-liquid groundstate with parameters ({\it e.g.} the effective mass) which are smooth functions of the Hubbard interaction, $U$. By contrast, the checkerboard model has a nodeless d-wave superconducting state (preformed pair condensate, $d$-BEC) for $0 < U < U_c$, which smoothly crosses over to an intermediate BCS-like superconducting phase ($d$-BCS), also with no nodal quasi-particles, for $|U - U_c| < {\cal O}(t^\prime)$, which gives way to a Fermi liquid phase at large $U > U_c = 4.58$.
Kivelson Steven A.
Tsai Wei-Feng
No associations
LandOfFree
Superconductivity in Inhomogeneous Hubbard Models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Superconductivity in Inhomogeneous Hubbard Models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconductivity in Inhomogeneous Hubbard Models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-110736