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

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.

arXiv comment4+ pages, 4 figures; to appear in PRB Rapid Communications

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• Charge, spin, and heat shot noises in the absence of average currents: Conditions on bounds at zero and finite frequencies
• Observation of Quantum Oscillations in the Photo-assisted Shot Noise of a Tunnel Junction
• Zero-frequency noise in adiabatically driven, interacting quantum systems
• Noise of a single-electron emitter
• Elementary Andreev Processes in a Driven Superconductor-Normal Metal Contact
• Correlations between charge and energy current in ac-driven coherent conductors
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• AC driven strongly correlated quantum circuits and Hall edge states: Unified photo-assisted noise and revisited minimal excitations
• Quasiparticles states for integer- and fractional-charged electron wave packets
• Quantum transport phenomena induced by time-dependent fields
• Continuous-Variable Entanglement Test in Driven Quantum Contacts