All-electrical measurement of the triplet-singlet spin relaxation time in self-assembled quantum dots
All-electrical measurement of the triplet-singlet spin relaxation time in self-assembled quantum dots
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DOI：
10.1063/1.4985572
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发表时间：
2017-08
影响因子：
4
通讯作者：
K. Eltrudis;A. Al‐Ashouri;A. Beckel;A. Ludwig;A. Wieck;M. Geller;A. Lorke
中科院分区：
文献类型：
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作者：
K. Eltrudis;A. Al‐Ashouri;A. Beckel;A. Ludwig;A. Wieck;M. Geller;A. Lorke
测量了自组装InAs/GaAs量子点中双电子自旋三重态到单重基态的自旋弛豫时间。我们使用时间分辨的测量方案，结合了自旋-电荷转换光谱，以解决|s↑，p↑ =三重态，其中一个电子在量子点s壳层，另一个在p壳层。从点到附近的二维电子气的状态选择性隧穿时间的评估，使我们能够确定的s-和p-壳层的占领和提取的弛豫时间从速率方程模型。测量了InAs/GaAs自组装量子点中两电子自旋三重态从激发态到单重态基态的自旋弛豫时间，发现三重态到单重态的自旋弛豫时间为25 μs。我们使用时间分辨的测量方案，结合了自旋-电荷转换光谱，以解决|s↑，p↑ =三重态，其中一个电子在量子点s壳层，另一个在p壳层。从点到附近的二维电子气的状态选择性隧穿时间的评估，使我们能够确定的s-和p-壳层的占领和提取的弛豫时间从速率方程模型。三重态到单重态自旋的弛豫时间为25 μs。
We have measured the spin relaxation time of an excited two-electron spin-triplet state into its singlet ground state in self-assembled InAs/GaAs quantum dots. We use a time-resolved measurement scheme that combines transconductance spectroscopy with spin-to-charge conversion to address the |s↑,p↑〉 triplet state, where one electron is in the quantum dot s-shell and a second one in the p-shell. The evaluation of the state-selective tunneling times from the dots into a nearby two-dimensional electron gas allows us to determine the s- and p-shell occupation and extract the relaxation time from a rate equation model. A comparably long triplet-to-singlet spin relaxation time of 25 μs is found.We have measured the spin relaxation time of an excited two-electron spin-triplet state into its singlet ground state in self-assembled InAs/GaAs quantum dots. We use a time-resolved measurement scheme that combines transconductance spectroscopy with spin-to-charge conversion to address the |s↑,p↑〉 triplet state, where one electron is in the quantum dot s-shell and a second one in the p-shell. The evaluation of the state-selective tunneling times from the dots into a nearby two-dimensional electron gas allows us to determine the s- and p-shell occupation and extract the relaxation time from a rate equation model. A comparably long triplet-to-singlet spin relaxation time of 25 μs is found.