电荷检测中的反作用效应
Back-action effects in charge detection
AI总结:
本研究针对电荷检测中测量反作用(MBA)可能干扰被探测物理性质的问题,提出新型非微扰方法,探究耦合探测器的Anderson杂质模型中相干动力学、强关联与非平衡条件的相互作用,发现非平衡下MBA的占据数温度导数效应源于探测器到杂质的能量流。
摘要:
电荷检测为基于量子点的介观结构提供了一种强有力的探测手段,但它也总是会引发测量反作用(measurement back-action,MBA)。如果MBA强度较高,可能会对被探测的物理性质产生不利影响。在本工作中,我们聚焦于MBA对Anderson杂质模型的影响,该模型中的杂质通过静电方式耦合到探测器上。我们提出了一种新的非微扰方法,探究了相干动力学、强关联与非平衡条件之间的相互作用。MBA的效应在占据数的温度导数中体现得最为明显。在非平衡情形下,我们确认这种效应源于从探测器流向杂质的能量流。
英文摘要:
Charge detection offers a powerful probe of mesoscopic structures based on quantum dots, but it also invariably results in measurement back-action (MBA). If strong, MBA can be detrimental to the physical properties being probed. In this work, we focus on the effects of MBA on an Anderson impurity model in which the impurity is coupled electrostatically to a detector. Introducing a novel non-perturbative method, we explore the interplay of coherent dynamics, strong correlations and non-equilibrium conditions. The effects of MBA can be seen most clearly in the temperature derivative of occupation. In the non-equilibrium case, we identify this as arising due to an energy flow from the detector to the impurity.
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