arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0710.0950cond-mat.mes-hallcond-mat.str-el
收藏

从自旋和轨道SU(4)到自旋SU(2)双量子点中的近藤效应

From spin and orbital SU(4) to spin SU(2) Kondo effect in double quantum dot

A. L. Chudnovskiy, Frank Hellmuth, V. Kagalovsky

摘要:

我们考虑了两个强静电耦合量子点平行排列时的自旋和轨道近藤效应。通过附加的引线增加点之间的电子交换诱导SU(4)自旋和轨道近藤效应与SU(2)自旋近藤效应之间的平滑交叉。SU(4)和SU(2)对称点相同,近藤温度在中间区域略有下降。在实验上,根据对塞曼场抑制自旋近藤效应的敏感性,可以区分两种近藤效应。详细分析了近藤温度和微分电导对通过引线和塞曼场的电子交换强度的依赖关系。

英文摘要:

We consider spin and orbital Kondo effect in a parallel arrangement of two strongly electrostatically coupled quantum dots. Increasing the exchange of electrons between the dots through the attached leads induces a smooth crossover between SU(4) spin- and orbital Kondo effect and SU(2) spin Kondo effect. Being the same for the SU(4) and SU(2) symmetry points, the Kondo temperature drops slightly in the intermediate regime. Experimentally, two kinds of Kondo effect can be discriminated by the sensitivity to the suppression of the spin Kondo effect by Zeeman field. The dependence of the Kondo temperature and of the differential conductance on the strength of electronic exchange through the leads and Zeeman field is analyzed in detail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑