动态库仑关联对Na0.3CoO2费米面的影响。
Effect of dynamical coulomb correlations on the fermi surface of Na0.3CoO2.
作者信息
Ishida H, Johannes M D, Liebsch A
机构信息
College of Humanities and Sciences, Nihon University, and CREST JST, Tokyo, Japan.
出版信息
Phys Rev Lett. 2005 May 20;94(19):196401. doi: 10.1103/PhysRevLett.94.196401. Epub 2005 May 17.
The t(2g) quasiparticle spectra of Na(0.3)CoO(2) are calculated within the dynamical mean field theory. It is shown that as a result of dynamical Coulomb correlations charge is transferred from the nearly filled e(g(')) subbands to the a(1g) band, thereby reducing orbital polarization among Co t(2g) states. Dynamical correlations therefore stabilize the small e(g(')) Fermi surface pockets, in contrast to angle-resolved photoemission data, which do not reveal these pockets.
在动态平均场理论框架下计算了Na(0.3)CoO(2)的t(2g)准粒子能谱。结果表明，由于动态库仑关联，电荷从近满的e(g('))子带转移到a(1g)带，从而降低了Co t(2g)态之间的轨道极化。因此，动态关联稳定了小的e(g('))费米面口袋，这与角分辨光电子能谱数据相反，后者并未揭示这些口袋。
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