Ota T, Ono K, Stopa M, Hatano T, Tarucha S, Song H Z, Nakata Y, Miyazawa T, Ohshima T, Yokoyama N
Mesoscopic Correlation Project, ERATO, JST, Atsugi-shi, Kanagawa 243-0198, Japan.
Phys Rev Lett. 2004 Aug 6;93(6):066801. doi: 10.1103/PhysRevLett.93.066801. Epub 2004 Aug 3.
We study the electronic structure of a single self-assembled InAs quantum dot by probing elastic single-electron tunneling through a single pair of weakly coupled dots. In the region below pinch-off voltage, the nonlinear threshold voltage behavior provides electronic addition energies exactly as the linear, Coulomb blockade oscillation does. By analyzing it, we identify the s and the p shell addition spectrum for up to six electrons in the single InAs dot, i.e., one of the coupled dots. The evolution of the shell addition spectrum with magnetic field provides Fock-Darwin spectra of the s and p shells.
我们通过探测单个弱耦合量子点对之间的弹性单电子隧穿，研究了单个自组装InAs量子点的电子结构。在夹断电压以下的区域，非线性阈值电压行为所提供的电子附加能量与线性库仑阻塞振荡所提供的完全相同。通过对其进行分析，我们确定了单个InAs量子点（即其中一个耦合量子点）中多达六个电子的s壳层和p壳层附加谱。壳层附加谱随磁场的演化给出了s壳层和p壳层的福克 - 达尔文谱。
