论文标题
探测双量子点中的单线 - 三曲线分裂：交流场振幅的含义
Probing the singlet-triplet splitting in double quantum dots: Implications of the ac field amplitude
论文作者
论文摘要
我们考虑了一个双量子点，其能量失调受交流电场控制。我们展示了一种能量构型，其AC诱导的流经双点的电流直接探测了小交流场振幅的自旋轨道抗突。相反，随着交流幅度的增加，形成了当前的抗抗气概，并且有关自旋轨道相互作用的直接信息被丢失。该结果表明，较大的AC振幅不一定是对自旋轨道耦合两旋态光谱的优势。此外，我们研究了AC诱导的电流峰与AC振幅，并在AC场形成自旋封闭状态时显示电流抑制。这种效果为电流带来了特征模式，可以通过调整交流振幅来随意控制。可以通过在自旋封锁状态下进行电子传输测量来探索我们的结果。
We consider a double quantum dot whose energy detuning is controlled by an ac electric field. We demonstrate an energy configuration for which the ac-induced current flowing through the double dot directly probes the spin-orbit anticrossing point for small ac field amplitudes. On the contrary, as the ac amplitude increases a current antiresonance is formed, and the direct information about the spin-orbit interaction is lost. This result indicates that a large ac amplitude is not necessarily advantageous for the spectroscopy of spin-orbit coupled two-spin states. Moreover, we investigate the ac-induced current peaks versus the ac amplitude and show a current suppression when the ac field forms spin blocked states. This effect gives rise to a characteristic pattern for the current which can be controlled at will by tuning the ac amplitude. Our results can be explored by performing electronic transport measurements in the spin blockade regime.
