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Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact

机译:通过量子点触点的双谐波电压驱动来控制电子-空穴对的产生

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摘要

A time-dependent electromagnetic field creates electron-hole excitations in a Fermi sea at low temperature. We show that the electron-hole pairs can be generated in a controlled way using harmonic and biharmonic time-dependent voltages applied to a quantum contact, and we obtain the probabilities of the pair creations. For a biharmonic voltage drive, we find that the probability of a pair creation decreases in the presence of an in-phase second harmonic. This accounts for the suppression of the excess noise observed experimentally (Gabelli and Reulet, arXiv: 1205.3638), proving that dynamic control and detection of elementary excitations in quantum conductors are within the reach of the present technology.
机译:随时间变化的电磁场在低温下的费米海中产生电子空穴激发。我们表明,可以使用施加在量子接触上的谐波和双谐波随时间变化的电压,以受控方式生成电子-空穴对,并获得产生电子对的概率。对于双谐波电压驱动器,我们发现在同相二次谐波的存在下,成对产生的可能性降低。这说明了对实验观察到的过量噪声的抑制(Gabelli和Reulet,arXiv:1205.3638),证明了对量子导体中基本激发的动态控制和检测在本技术的范围之内。

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