量子点电路中声子介导与库仑背Action
Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits
摘要：
量子点接触（QPC）通常用于电容检测耦合量子点（QD）的电荷状态。在GaAs/AlGaAs异质结中，观察到了偏置QPC对横向限定的双量子点的间接反作用。能量由偏置QPC引线中的非平衡载流子发射。这种能量的一部分被双量子点吸收，在那里它引起电荷波动，可以在其稳定性图中的某些条件下观察到。通过研究吸收能量的光谱，我们确定了声学声子和库仑相互作用参与的反作用，这取决于几何形状和耦合常数。
英文摘要：
Quantum point contacts (QPCs) are commonly employed to capacitively detect the charge state of coupled quantum dots (QD). An indirect back-action of a biased QPC onto a double QD laterally defined in a GaAs/AlGaAs heterostructure is observed. Energy is emitted by non-equilibrium charge carriers in the leads of the biased QPC. Part of this energy is absorbed by the double QD where it causes charge fluctuations that can be observed under certain conditions in its stability diagram. By investigating the spectrum of the absorbed energy, we identify both acoustic phonons and Coulomb interaction being involved in the back-action, depending on the geometry and coupling constants.
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