Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-31
Physics
Condensed Matter
Strongly Correlated Electrons
To be published in Phys. Soc. Jpn. 77 No.11 (2008)
Scientific paper
10.1143/JPSJ.77.114702
A new wavefunction which improves the Gutzwiller-type local ansatz method has been proposed to describe the correlated electron system. The ground-state energy, double occupation number, momentum distribution function, and quasiparticle weight have been calculated for the half-filled band Hubbard model in infinite dimensions. It is shown that the new wavefunction improves the local-ansatz approach (LA) proposed by Stollhoff and Fulde. Especially, calculated momentum distribution functions show a reasonable momentum dependence. The result qualitatively differs from those obtained by the LA and the Gutzwiller wavefunction. Furthermore, the present approach combined with the projection operator method CPA is shown to describe quantitatively the excitation spectra in the insulator regime as well as the critical Coulomb interactions for a gap formation in infinite dimensions.
Kakehashi Yoshiro
Shimabukuro T.
Yasuda Chitoshi
No associations
LandOfFree
Local-Ansatz Approach with Momentum Dependent Variational Parameters to Correlated Electron Systems 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 Local-Ansatz Approach with Momentum Dependent Variational Parameters to Correlated Electron Systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Local-Ansatz Approach with Momentum Dependent Variational Parameters to Correlated Electron Systems will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-578569