Electron correlation effects on tunneling through a two-level quantum dot
Electron correlation effects on tunneling through a two-level quantum dot
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电子相关效应对穿过两级量子点的隧道效应
DOI：
10.1063/1.372352
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发表时间：
2000
影响因子：
3.2
通讯作者：
V. Ferrari
中科院分区：
文献类型：
--
作者：
E. Anda;G. Chiappe;M. A. Davidovich;V. Ferrari
通过测量电流的波姆-阿哈罗诺夫振荡来检测近藤效应的可能性，该量子点嵌入在连接两根引线的介观环的一个臂上。所述环由磁通穿过，所述点受到控制其电荷含量的栅电压V0。每当点的电子数为奇数，从而产生净自旋时，系统就处于近藤态。因此，当两个点能级及其相关的库仑阻塞峰通过改变V0调谐到费米能级时，近藤效应可以打开或关闭。由于近藤共振提供了一个新的通道，让电子通过隧道的点，它允许电流沿着环的手臂流动，其中包含的点，即使点的水平是共振。沿着环的上臂和下臂的波之间的干涉引起了电流的庞-阿哈罗诺夫振荡，这是一个清晰的信号。
The possibility of detection of the Kondo effect by means of the measurement of Bohm-Aharonov oscillations of the current going through a quantum dot embedded in one of the arms of a mesoscopic ring connected to two leads is demonstrated. The ring is threaded by a magnetic flux and the dot is subjected to a gate voltage V0 which controls its charge content. Whenever the dot has an odd number of electrons and, as a consequence, a net spin the system is in the Kondo regime. Thus, the Kondo effect can be turned on and off as the two dot levels and their associate Coulomb blockade peaks are tuned to the Fermi level by changing V0. Since the Kondo resonance provides a new channel for the electrons to tunnel through the dot it allows the flowing of current along the arm of the ring which contains the dot even though the dot levels are out of resonance. The interference between the waves going along the upper and lower arms of the ring gives rise to the Bohm-Aharonov oscillations of the current and is a clear si...