Orbital Kondo effect in cobalt-benzene sandwich molecules.
Orbital Kondo effect in cobalt-benzene sandwich molecules.
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DOI：
10.1103/physrevlett.107.146604
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发表时间：
2011-05
影响因子：
8.6
通讯作者：
M. Karolak;D. Jacob;A. Lichtenstein
中科院分区：
文献类型：
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作者：
M. Karolak;D. Jacob;A. Lichtenstein
我们研究了桥接铜纳米接触尖端的联苯夹心分子，作为相关分子传输的现实模型。为此，我们采用最近开发的方法来计算纳米导体的相关电子结构和输运特性。当分子被纳米接触尖端轻微压缩时，源自强相互作用的 Co 3d 壳层的动态相关性会产生轨道近藤效应，而通常的自旋近藤效应则由于洪德规则耦合而受到抑制。这种非平凡的近藤效应在费米能级的谱函数中产生尖锐且与温度相关的阿布里科索夫-苏尔共振，并在低偏置电导中产生相应的法诺线形状。
We study a Co-benzene sandwich molecule bridging the tips of a Cu nanocontact as a realistic model of correlated molecular transport. To this end we employ a recently developed method for calculating the correlated electronic structure and transport properties of nanoscopic conductors. When the molecule is slightly compressed by the tips of the nanocontact the dynamic correlations originating from the strongly interacting Co 3d shell give rise to an orbital Kondo effect while the usual spin Kondo effect is suppressed due to Hund's rule coupling. This nontrivial Kondo effect produces a sharp and temperature-dependent Abrikosov-Suhl resonance in the spectral function at the Fermi level and a corresponding Fano line shape in the low bias conductance.