Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections

Details Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections

2007-04-02

arxiv.org/abs/0704.0241v1

J. Phys.: Condens. Matter vol. 17 (2005) 5663-5676

Physics

Condensed Matter

Superconductivity

Reprint to improve access. 14 pages. 10 figures.

Scientific paper

I investigate superconducting states in a quasi-2D Holstein model using the dynamical cluster approximation (DCA). The effects of spatial fluctuations (non-local corrections) are examined and approximations neglecting and incorporating lowest-order vertex corrections are computed. The approximation is expected to be valid for electron-phonon couplings of less than the bandwidth. The phase diagram and superconducting order parameter are calculated. Effects which can only be attributed to theories beyond Migdal--Eliashberg theory are present. In particular, the order parameter shows momentum dependence on the Fermi-surface with a modulated form and s-wave order is suppressed at half-filling. The results are discussed in relation to Hohenberg's theorem and the BCS approximation.

Affiliated with

Also associated with

No associations

Rating

Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections 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 Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconducting states of the quasi-2D Holstein model: Effects of vertex and non-local corrections will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-492584