论文标题
量子点中非平衡稳态的核磁共振光谱
Nuclear magnetic resonance spectroscopy of nonequilibrium steady states in quantum dots
论文作者
论文摘要
由于与周围核自旋的相互作用，在量子点（QD）集合中的局部电子自旋的光学诱导极化。尽管进行了这种逐步进行，但QD中的旋转可以通过施加周期性激光脉冲来控制以连贯地响应，从而导致每个脉冲之前的自旋极化的复兴。这种效果被称为自旋模式锁定，很大程度上取决于核自旋浴的某些极化的新兴选择，该浴被驱动到远离平衡的稳态。我们将核成分在$ _x $ ga $ _ {1-x} $中作为qds对这种非平衡行为的影响，并证明核磁共振（NMR）在复兴振幅的磁场依赖性中看起来非常敏锐。这表明了一种新型的NMR光谱法。
The optically induced polarization of localized electron spins in an ensemble of quantum dots (QDs) dephases due to the interaction with the surrounding nuclear spins. Despite this dephasing, the spins in the QDs can be controlled to respond coherently by applying periodic laser pulses, leading to a revival of the spin polarization before each pulse. This effect, known as spin mode locking, strongly depends on an emerging selection of certain polarizations of the nuclear spin bath which is driven to a steady state far from equilibrium. We investigate the influence of the nuclear composition in In$_x$Ga$_{1-x}$As QDs on this nonequilibrium behavior and demonstrate that nuclear magnetic resonances (NMR) appear as very sharp minima in the magnetic field dependence of the revival amplitude. This suggests a novel kind of NMR spectroscopy.
