National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom.
Phys Rev Lett. 2013 Nov 22;111(21):216807. doi: 10.1103/PhysRevLett.111.216807.
We demonstrate the energy- and time-resolved detection of single-electron wave packets from a clock-controlled source transmitted through a high-energy quantum Hall edge channel. A quantum dot source is loaded with single electrons which are then emitted ~150 meV above the Fermi energy. The energy spectroscopy of emitted electrons indicates that at high magnetic field these electrons can be transported over several microns without inelastic electron-electron or electron-phonon scattering. Using a time-resolved spectroscopic technique, we deduce the wave packet size at picosecond resolution. We also show how this technique can be used to switch individual electrons into different electron waveguides (edge channels).
我们演示了通过高能量子霍尔边缘通道传输的时钟控制源的单电子波包的能量和时间分辨检测。一个量子点源被加载有单个电子，这些电子然后在费米能量上方约 150 毫电子伏特的位置被发射出来。发射电子的能谱表明，在高磁场中，这些电子可以在没有非弹性电子-电子或电子-声子散射的情况下传输几微米。我们使用时间分辨光谱技术，在皮秒分辨率下推断出波包的大小。我们还展示了如何使用这种技术将单个电子切换到不同的电子波导（边缘通道）。
