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Shot Noise of Cotunneling Current

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0211024v1.pdf(276.82 KB)
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2003
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Sukhorukov, Eugene V.
Loss, Daniel
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urn:nbn:de:bsz:352-opus-91293
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10.1007/978-94-010-0089-5_8
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Abstract
We study the noise of the cotunneling current through one or several tunnel-coupled quantum dots in the Coulomb blockade regime. The various regimes of weak and strong, elastic and inelastic cotunneling are analyzed for quantum-dot systems (QDS) with few-level, nearly-degenerate, and continuous electronic spectra. In the case of weak cotunneling we prove a non-equilibrium fluctuation-dissipation theorem which leads to a universal expression for the noise-to-current ratio (Fano factor). The noise of strong inelastic cotunneling can be super-Poissonian due to switching between QDS states carrying currents of different strengths. The transport through a double-dot (DD) system shows an Aharonov-Bohm effect both in noise and current. In the case of cotunneling through a QDS with a continuous energy spectrum the Fano factor is very close to one.
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530 Physics
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Quantum Noise in Mesoscopic systems / Nazarov, Yu. V. (ed.). - Dordrecht : Springer Netherland, 2003. - pp. 149-172
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Cite This
ISO 690SUKHORUKOV, Eugene V., Guido BURKARD, Daniel LOSS, 2003. Shot Noise of Cotunneling Current. In: NAZAROV, Yu. V., ed.. Quantum Noise in Mesoscopic systems. Dordrecht:Springer Netherland, pp. 149-172. Available under: doi: 10.1007/978-94-010-0089-5_8
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@incollection{Sukhorukov2003Noise-9303,
  year={2003},
  doi={10.1007/978-94-010-0089-5_8},
  title={Shot Noise of Cotunneling Current},
  publisher={Springer Netherland},
  address={Dordrecht},
  booktitle={Quantum Noise in Mesoscopic systems},
  pages={149--172},
  editor={Nazarov, Yu. V.},
  author={Sukhorukov, Eugene V. and Burkard, Guido and Loss, Daniel}
}
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    <dcterms:abstract xml:lang="eng">We study the noise of the cotunneling current through one or several tunnel-coupled quantum dots in the Coulomb blockade regime. The various regimes of weak and strong, elastic and inelastic cotunneling are analyzed for quantum-dot systems (QDS) with few-level, nearly-degenerate, and continuous electronic spectra. In the case of weak cotunneling we prove a non-equilibrium fluctuation-dissipation theorem which leads to a universal expression for the noise-to-current ratio (Fano factor). The noise of strong inelastic cotunneling can be super-Poissonian due to switching between QDS states carrying currents of different strengths. The transport through a double-dot (DD) system shows an Aharonov-Bohm effect both in noise and current. In the case of cotunneling through a QDS with a continuous energy spectrum the Fano factor is very close to one.</dcterms:abstract>
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