Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-09-23
Eur. Phys. J. B 72, 59-66 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages with 5 figures
Scientific paper
10.1140/epjb/e2009-00314-1
The nondegenerate two-orbital Hubbard model is studied within the dynamic mean-field theory to reveal the influence of two important factors, i.e. crystal field splitting and interorbital hopping, on orbital selective Mott transition (OSMT) and realistic compound Ca$_{2-x}$Sr$_{x}$RuO$_{4}$. A distinctive feature of the optical conductivity of the two nondegenerate bands is found in OSMT phase, where the metallic character of the wide band is indicated by a nonzero Drude peak, while the insulating narrow band has its Drude peak drop to zero in the mean time. We also find that the OSMT regime expands profoundly with the increase of interorbital hopping integrals. On the contrary, it is shown that large and negative level splitting of the two orbitals diminishes the OSMT regime completely. Applying the present findings to compound Ca$_{2-x}$Sr$_{x}$RuO$_{4}$, we demonstrate that in the doping region from $x=0.2$ to 2.0, the negative level splitting is unfavorable to the OSMT phase.
Song Yun
Zou Liang-Jian
No associations
LandOfFree
Two-orbital Systems with Crystal Field Splitting and Interorbital Hopping 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 Two-orbital Systems with Crystal Field Splitting and Interorbital Hopping, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two-orbital Systems with Crystal Field Splitting and Interorbital Hopping will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-651565