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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Exciton spin manipulation in InAs/GaAs quantum dots: Exchange interaction and magnetic field effects
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Exciton spin manipulation in InAs/GaAs quantum dots: Exchange interaction and magnetic field effects

机译：InAs / GaAs量子点中的激子自旋操纵：交换相互作用和磁场效应

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摘要

We report quantum beat phenomena between different polarization states in InAs quantum dots, observed in time-resolved photoluminescence and transient dichroism measurements. The polarization of the emitted light can be changed from linear to circular by applying a small magnetic field. Following quasiresonant excitation the electron and hole spin states remain stable during the exciton lifetime, independent of the applied magnetic field. We show that the exciton spin coherence is partially preserved in the energy relaxation process. These experiments enable us to measure the anisotropic exchange energy ΔE_(XY) and the exciton g factor. We find ΔE_(XY) approx = 30 μeV and g approx = 2.5 for the quantum dot excitons.
机译：我们报告了在时间分辨的光致发光和瞬态二向色性测量中观察到的InAs量子点中不同极化状态之间的量子跳动现象。通过施加较小的磁场，可以将发射光的偏振从线性更改为圆形。在准共振激励之后，电子和空穴自旋态在激子寿命期间保持稳定，与所施加的磁场无关。我们表明激子自旋相干在能量弛豫过程中被部分保留。这些实验使我们能够测量各向异性交换能ΔE_（XY）和激子g因子。对于量子点激子，我们发现ΔE_（XY）大约= 30μeV，g大约= 2.5。

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