Super-Poissonian shot noise as a measure of dephasing in closed quantum dots

Dubrovin, D.; Eisenberg, Eli

doi:10.1103/physrevb.76.195330

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…In this case, the superconducting island behaves like a normal quantum dot with multiple interacting energy levels. The giant shot noise has been demonstrated in an interacting quantum dot with multiple tunneling channels in several previous studies [67][68][69][70][71][72][73][74]. The reason is traced to a dynamical channel blockade of the mechanically aided shuttle current that occurs in devices with highly polarization or asymmetry of the channel-lead coupling strengths.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Enhanced current noise correlations in a Coulomb-Majorana device

Lü

Shen

2016

Phys. Rev. B

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Majorana bound states (MBSs) nested in a topological nanowire are predicted to manifest nonlocal correlations in the presence of a finite energy splitting between the MBSs. However, the signal of the nonlocal correlations has not yet been detected in experiments. A possible reason is that the energy splitting is too weak and seriously affected by many system parameters. Here we investigate the charging energy induced nonlocal correlations in a hybrid device of MBSs and quantum dots. The nanowire that hosts the MBSs is assumed in proximity to a mesoscopic superconducting island with a finite charging energy. Each end of the nanowire is coupled to one lead via a quantum dot with resonant levels. With a floating superconducting island, the devices shows a negative differential conductance and giant super-Poissonian shot noise, due to the interplay between the nonlocality of the MBSs and dynamical Coulomb blockade effect. When the island is strongly coupled to a bulk superconductor, the current cross correlations at small lead chemical potentials are negative by tuning the dot energy levels. In contrast, the cross correlation is always positive in a non-Majorana setup. This difference may provide a signature for the existence of the MBSs.Comment: 11 pages, 10 figure

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Enhanced current noise correlations in a Coulomb-Majorana device

Lü

Shen

2016

Phys. Rev. B

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“…In particular, shot noise characteristics can provide information about the feature of the pseudospin Kondo effect in a laterally coupled double QDs 15 , the spin accumulations in a electron reservoir 16 , and the charge fractionalization in the ν = 2 quantum Hall edge 17 . In addition, the degree of entanglement of two electrons in the double QDs 18 , the dephasing rate in a closed QD 19 , the internal level structure of single molecule magnet 20 21 can be characterized by the super-Poissonian shot noise.…”

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confidence: 99%

Non-Markovian full counting statistics in quantum dot molecules

Xue

Jiao

Liang

et al. 2015

Sci Rep

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Full counting statistics of electron transport is a powerful diagnostic tool for probing the nature of quantum transport beyond what is obtainable from the average current or conductance measurement alone. In particular, the non-Markovian dynamics of quantum dot molecule plays an important role in the nonequilibrium electron tunneling processes. It is thus necessary to understand the non-Markovian full counting statistics in a quantum dot molecule. Here we study the non-Markovian full counting statistics in two typical quantum dot molecules, namely, serially coupled and side-coupled double quantum dots with high quantum coherence in a certain parameter regime. We demonstrate that the non-Markovian effect manifests itself through the quantum coherence of the quantum dot molecule system, and has a significant impact on the full counting statistics in the high quantum-coherent quantum dot molecule system, which depends on the coupling of the quantum dot molecule system with the source and drain electrodes. The results indicated that the influence of the non-Markovian effect on the full counting statistics of electron transport, which should be considered in a high quantum-coherent quantum dot molecule system, can provide a better understanding of electron transport through quantum dot molecules.

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Shot noise as a measure of the lifetime and energy splitting of Majorana bound states

Lü

Guo

et al. 2015

Journal of Applied Physics

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Super-Poissonian shot noise as a measure of dephasing in closed quantum dots

Cited by 6 publications

References 20 publications

Enhanced current noise correlations in a Coulomb-Majorana device

Enhanced current noise correlations in a Coulomb-Majorana device

Non-Markovian full counting statistics in quantum dot molecules

Shot noise as a measure of the lifetime and energy splitting of Majorana bound states

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