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首页> 外文会议>International Workshop on the Physics of Semiconductor Devices >Electron-Spin Relaxation by the Interaction with Nuclear-Spins in InP Quantum Dots
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Electron-Spin Relaxation by the Interaction with Nuclear-Spins in InP Quantum Dots

机译：通过与INP量子点中的核旋转相互作用来旋转舒适

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Effects of nuclear-spins on the electron-spin polarization in singly negatively charged InP quantum dots are studied experimentally at 5K. Pump-probe photo-luminescence measurements of electron-spin relaxation in the microsecond time scale are used to estimate the time period T{sub}N～1μs of the Larmor precession of nuclear-spins in the hyperfine field of electrons, under the vanishing external magnetic field (B{sub}c). From the rime-integrated measurements of electron-spin polarization as a function of B{sub}c applied along the optical excitation axis, we find that the Overhauser field B{sub}N arising from the dynamic nuclear polarization increases linearly with the excitation power (P{sub}X). We obtain B{sub}N=6mT at P{sub}X=50mW. The effective magnetic field of the frozen fluctuations of nuclear-spins is found to be B{sub}F≈15mT, independent of P{sub}X.
机译：在实验上在5k实验研究了核旋转对单个带负电的INP量子点中的电子旋转极化的影响。泵探针在微秒刻度中的电子旋转放宽的光发光测量用于估计在消失的外部的超浓度领域中核旋转的时间段T {sub} n〜1μs的时间段t {sub} n〜1μs磁场（b {sub} c）。从沿着光学激发轴施加的B {Sub} C的函数的鲁末集成测量，从沿着光学激发轴施加的函数，我们发现由动态核极化产生的overhauser字段B {Sub} n随着激励功率线性而导致线性增加（p {sub} x）。在p {sub} x = 50mW处获得b {sub} n = 6mt。发现核旋转的冻结波动的有效磁场是B {Sub}F≈1J15Mt，与P {Sub} x无关。

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