Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Rev Lett. 2013 Jun 28;110(26):266803. doi: 10.1103/PhysRevLett.110.266803. Epub 2013 Jun 25.
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.
我们展示了在比典型自旋寿命短得多的时间尺度内，双量子点中两个光电子的俘获和随后的电子转移动力学。通过光电子在激发态中的共振双点隧道，实现了光电子俘获的识别。电子转移使我们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强烈影响了双点共振隧道。最后，我们利用光电子的双点隧道检测到了两个电子 singlet-triplet 态杂化的影响。
