Rohrlich Daniel, Zarchin Oren, Heiblum Moty, Mahalu Diana, Umansky Vladimir
Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.
Phys Rev Lett. 2007 Mar 2;98(9):096803. doi: 10.1103/PhysRevLett.98.096803. Epub 2007 Mar 1.
Resonant tunneling through two identical potential barriers renders them transparent, as particle trajectories interfere coherently. Here we realize resonant tunneling in a quantum dot (QD), and show that detection of electron trajectories renders the dot nearly insulating. Measurements were made in the integer quantum Hall regime, with the tunneling electrons in an inner edge channel coupled to detector electrons in a neighboring outer channel, which was partitioned. Quantitative analysis indicates that just a few detector electrons completely dephase the QD.
通过两个相同的势垒的共振隧穿使它们变得透明，因为粒子轨迹会发生相干干涉。在这里，我们在量子点（QD）中实现了共振隧穿，并表明对电子轨迹的探测会使该量子点几乎绝缘。测量是在整数量子霍尔 regime 下进行的，隧穿电子处于内边缘通道，与相邻外通道中的探测器电子耦合，该外通道被分隔。定量分析表明，仅仅几个探测器电子就能使量子点完全退相。
