We have measured the electrochemical capacitance in a quantum coherent capacitor consisting of a quantum dot connected to an electron reservoir by a gate tunable quantum point contact and Coulomb coupled to a gate. The results show that for a weak transparent channel, the capacitance exhibits sharp Coulomb blockade oscillations with gate voltage related to the oscillations of the dot density of states, which is almost independent of the applied magnetic field. As the transmitting channel becomes more transparent, the capacitance oscillations decrease in magnitude reflecting the broadening of the resonances. Remarkably, we find that the capacitance oscillation persists even for a fully transparent quantum channel. From the magnetic field and temperature dependence, we conclude that such a capacitance oscillation is a mesoscopic coherent effect that arises due to the interference of electrons in a nearly open dot.

中文翻译：

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由于相互作用的量子电容器中的量子动态相干性引起的介观电容振荡

我们测量了量子相干电容器中的电化学电容，该电容器由通过栅极可调量子点接触连接到电子库的量子点和耦合到栅极的库仑组成。结果表明，对于弱透明通道，电容表现出急剧的库仑阻塞振荡，栅极电压与状态点密度的振荡有关，这几乎与施加的磁场无关。随着传输通道变得更加透明，电容振荡的幅度减小，反映了谐振的加宽。值得注意的是，我们发现即使对于完全透明的量子通道，电容振荡仍然存在。从磁场和温度依赖性，