Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum

Details Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum

2008-10-08

arxiv.org/abs/0810.1498v1

Phys. Rev. B 78, 235120 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 10 figures

Scientific paper

10.1103/PhysRevB.78.235120

We generalize the momentum average (MA) approximation to study the properties of models with momentum-dependent electron-phonon coupling. As in the case of the application of the original MA to the Holstein model, the results are analytical, numerically trivial to evaluate, exact for both zero bandwidth and for zero electron-phonon coupling, and are accurate everywhere in parameter space. Comparison with available numerical data confirms this accuracy. We then show that further improvements can be obtained based on variational considerations, using the one-dimensional breathing-mode Hamiltonian as a specific example. For example, by using this variational MA, we obtain ground state energies within at most 0.3% error of the numerical data.

Affiliated with

Also associated with

No associations

Rating

Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum 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 Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Momentum average approximation for models with electron-phonon coupling dependent on the phonon momentum will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-30626