| 1. |
- Gnodtke, C, et al.
(författare)
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Phonon-assisted tunneling through quantum dot stacks
- 2006
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Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 73:11, s. 1-115338
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Tidskriftsartikel (refereegranskat)abstract
- The impact of electron-phonon interaction on the coherent transport through a quantum dot stack is investigated using the nonequilibrium Green's function technique. While the main resonance is due to the alignment of the single dot levels, satellite peaks occur due to resonances with phonon replica of the bare levels. This effect is analyzed in detail and we show that the inclusion of nondiagonal self-energies leads to a significant reduction of the induced current, which is interpreted as an interference effect.
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| 2. |
- Kiesslich, G, et al.
(författare)
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Counting statistics and decoherence in coupled quantum dots
- 2006
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Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 73:3, s. 1-033312
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Tidskriftsartikel (refereegranskat)abstract
- We theoretically consider charge transport through two quantum dots coupled in series. The corresponding full counting statistics for noninteracting electrons is investigated in the limits of sequential and coherent tunneling by means of a master equation approach and a density matrix formalism, respectively. We clearly demonstrate the effect of quantum coherence on the zero-frequency cumulants of the transport process, focusing on noise and skewness. Moreover, we establish the continuous transition from the coherent to the incoherent tunneling limit in all cumulants of the transport process and compare this with decoherence described by a dephasing voltage probe model.
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| 3. |
- Kiesslich, G, et al.
(författare)
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Decoherence and current fluctuations in tunneling through coupled quantum dots
- 2005
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Ingår i: [Host publication title missing]. - : AIP. - 1551-7616 .- 0094-243X. ; 780, s. 439-441
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The electronic transport through two coupled quantum dots in series can be described either in a fully coherent approach (e.g. density matrix description or nonequilibrium Green's functions) or in a simple sequential tunneling treatment (Pauli master equation with Fermi's Golden rule for coupling between the quantum dots). It turns out that both descriptions provide the same average current for noninteracting electrons. In contrast, the zero-frequency spectral power density and the skewness are different for intermediate coupling strengths between the quantum dots reflecting their sensitivity on coherence in the tunneling process.
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| 4. |
- Kiesslich, G, et al.
(författare)
-
Super-Poissonian current fluctuations in tunneling through coupled quantum dots
- 2006
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Ingår i: Springer Proceedings in Physics: Proc. of the 14th International Conference on Nonequilibrium Carrier Dynamics in Semiconductors. - 9783540365877 ; 110, s. 23-27
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The shot noise behavior of sequential tunneling through two vertically coupled quantum dots is studied by means of a master equation approach. In particular, we propose a mechanism to observe super-Poissonian shot noise in such a system. The crucial ingredient is the Coulomb interaction between electrons in individual quantum dots.
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