Mott-Hubbard metal-insulator transition at non-integer filling

Details Mott-Hubbard metal-insulator transition at non-integer filling Mott-Hubbard metal-insulator transition at non-integer filling

2003-09-02

arxiv.org/abs/cond-mat/0309067v1

Phys. Rev. B 69, 045112 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 7 figures

Scientific paper

10.1103/PhysRevB.69.045112

Correlated electrons in a binary alloy $A_{x}B_{1-x}$ are investigated within the Hubbard model and dynamical mean--field theory (DMFT). The random energies $\epsilon_{i}$ have a bimodal probability distribution and an energy separation $\Delta $. We solve the DMFT equations by the numerical renormalization group method at zero temperature, and calculate the spectral density as a function of disorder strength $\Delta $ and interaction $U$ at different fillings. For filling factors $\nu =x$ or $1+x$ the lower or upper alloy subband is half filled and the system becomes a Mott insulator at strong interactions, with a correlation gap at the Fermi level. At the metal--insulator transition hysteresis is observed. We also analyze the effective theory in the $\Delta \to \infty $ limit and find good agreement between analytical and numerical results for the critical interaction $U_{c}$ at which the metal--insulator transition occurs.

Affiliated with

Also associated with

No associations

Rating

Mott-Hubbard metal-insulator transition at non-integer filling 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 Mott-Hubbard metal-insulator transition at non-integer filling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mott-Hubbard metal-insulator transition at non-integer filling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-493304