介观器件中的非平衡近藤效应
Out-of-equilibrium Kondo effect in a mesoscopic device.
作者信息
De Franceschi S, Hanson R, Van Der Wiel W G, Elzerman J M, Wijpkema J J, Fujisawa T, Tarucha S, Kouwenhoven L P
机构信息
Department of NanoScience, DIMES, and ERATO Mesoscopic Correlation Project, Delft University of Technology, P.O. Box 5046, The Netherlands.
出版信息
Phys Rev Lett. 2002 Oct 7;89(15):156801. doi: 10.1103/PhysRevLett.89.156801. Epub 2002 Sep 20.
We study the nonequilibrium regime of the Kondo effect in a quantum dot laterally coupled to a narrow wire. We observe a split Kondo resonance when a finite bias voltage is imposed across the wire. The splitting is attributed to the creation of a double-step Fermi distribution function in the wire. Kondo correlations are strongly suppressed when the voltage across the wire exceeds the Kondo temperature. A perpendicular magnetic field enables us to selectively control the coupling between the dot and the two Fermi seas in the wire. Already at fields of order 0.1 T only the Kondo resonance associated with the strongly coupled reservoir survives.
我们研究了横向耦合到窄线的量子点中近藤效应的非平衡态。当在该线上施加有限偏置电压时，我们观察到近藤共振分裂。这种分裂归因于该线中双步费米分布函数的产生。当线上的电压超过近藤温度时，近藤关联被强烈抑制。垂直磁场使我们能够选择性地控制量子点与线中两个费米海之间的耦合。仅在0.1 T量级的磁场下，与强耦合库相关的近藤共振就得以保留。
Zotero 插件