Institute of Molecular Physics of the Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland.
J Phys Condens Matter. 2013 Feb 27;25(8):085303. doi: 10.1088/0953-8984/25/8/085303. Epub 2013 Jan 31.
A system composed of two quantum dots, i.e. a strongly interacting Kondo dot and a noninteracting one, placed in the arms of the Aharonov-Bohm ring, is investigated theoretically. The ring is coupled to normal leads. This configuration is mapped on the system of a correlated impurity embedded in a host with energy and flux dependent density of states. Additionally, the presence of the Rashba field allows a spin selective opening of the pseudogap in the density of states of the host, when the level of the noninteracting dot is tuned to the Fermi energy. This selectively diminishes electron correlations in the Kondo dot and creates resultant spin polarization at the Fermi level. It is shown that this polarization arises in the absence of any exchange field. Interestingly, this Rashba-correlation-induced spin polarization reaches its maximum for the position of the Kondo dot level corresponding to the Kondo temperature of the Anderson impurity in the host with constant density of states.
一个由两个量子点组成的系统，即一个强相互作用的 Kondo 点和一个非相互作用的量子点，被放置在 Aharonov-Bohm 环的臂上，进行了理论研究。环与正常引线耦合。这种配置被映射到一个相关杂质嵌入在具有能量和通量相关态密度的主体中的系统上。此外，当非相互作用点的能级调谐到费米能时，Rashba 场的存在允许主体态密度中的赝隙选择性打开。这选择性地减小了 Kondo 点中的电子相关性，并在费米能级处产生了相应的自旋极化。结果表明，这种极化是在没有任何交换场的情况下产生的。有趣的是，这种 Rashba 相关诱导的自旋极化在 Kondo 点能级的位置处达到最大值，该位置对应于具有恒定态密度的主体中 Anderson 杂质的 Kondo 温度。
