Nondestructive Real-Time Measurement of Charge and Spin Dynamics of Photoelectrons in a Double Quantum Dot
Nondestructive Real-Time Measurement of Charge and Spin Dynamics of Photoelectrons in a Double Quantum Dot
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DOI：
10.1103/physrevlett.110.266803
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发表时间：
2013-06-25
影响因子：
8.6
通讯作者：
Tarucha, S.
中科院分区：
文献类型：
--
作者：
Fujita, T.;Kiyama, H.;Tarucha, S.
我们演示了双量子点中的一个和两个光电子陷阱以及随后的与点间转移相关的动力学，时间尺度比典型的自旋寿命短得多。光电子陷阱的识别是通过激发态光电子的共振点间隧道效应实现的。点间转移使得能够以非破坏性的方式检测单个光电子。当两个光电子几乎同时被捕获时，我们观察到电子之间的库仑相互作用对点间共振隧穿有很大的影响。最后，利用光电子的点间隧道效应探测了双电子单态-三态杂化的影响。
We demonstrate one and two photoelectron trapping and the subsequent dynamics associated with interdot transfer in double quantum dots over a time scale much shorter than the typical spin lifetime. Identification of photoelectron trapping is achieved via resonant interdot tunneling of the photoelectrons in the excited states. The interdot transfer enables detection of single photoelectrons in a nondestructive manner. When two photoelectrons are trapped at almost the same time we observed that the interdot resonant tunneling is strongly affected by the Coulomb interaction between the electrons. Finally the influence of the two-electron singlet-triplet state hybridization has been detected using the interdot tunneling of a photoelectron.