Effect of dynamical coulomb correlations on the fermi surface of Na0.3CoO2.
Effect of dynamical coulomb correlations on the fermi surface of Na0.3CoO2.
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DOI：
10.1103/physrevlett.94.196401
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发表时间：
2004-12
影响因子：
8.6
通讯作者：
Hiroshi Ishida;M. Johannes;A. Liebsch
中科院分区：
文献类型：
--
作者：
Hiroshi Ishida;M. Johannes;A. Liebsch
利用动力学平均场理论计算了Na(0.3)CoO(2)的t（2g）准粒子谱。结果表明，由于动态库仑关联，电荷从接近填充的e（g(')）子带转移到a（1g）子带，从而降低了Co （2g）态之间的轨道极化。因此，动态相关性稳定了小的e（g(')）费米表面袋，与角度分辨的光电发射数据相反，后者没有显示这些袋。
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.