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

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2012

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http://nbn-resolving.de/urn:nbn:de:bsz:352-224821
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https://doi.org/10.1103/PhysRevB.86.241306
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Physical Review B. 2012, 86(24). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.86.241306

Zusammenfassung

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.

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530 Physik

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ISO 690VANEVIC, Mihajlo, Wolfgang BELZIG, 2012. Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact. In: Physical Review B. 2012, 86(24). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.86.241306
BibTex
@article{Vanevic2012Contr-22482,
  year={2012},
  doi={10.1103/PhysRevB.86.241306},
  title={Control of electron-hole pair generation by biharmonic voltage drive of a quantum point contact},
  number={24},
  volume={86},
  issn={1098-0121},
  journal={Physical Review B},
  author={Vanevic, Mihajlo and Belzig, Wolfgang}
}
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    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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