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arXiv · 1210.7541

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

Mihajlo Vanevic·Wolfgang Belzig
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Abstract

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 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.

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Mihajlo Vanevic, Wolfgang Belzig. 2012-12-19. Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact. https://doi.org/10.1103/physrevb.86.241306

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