Super Poissonian noise in the FQHE regime

Rodríguez, Víctor Manuel Nieto; Roche, P.; Glattli, Christian; Jin, Y.; Etienne, B.

doi:10.1016/s1386-9477(01)00249-1

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…The available theory of current cumulants for a general tunnelling Hamiltonian [46], combined with the recent successes in measurements of current cumulants in QPC [47,48] and other structures [49,50], gives a firm background and a strong motivation for this analysis. Current cumulants [51,52,53] contain indeed several information on the carrier charges, and may discriminate between models based either on a single carrier or on many carriers, considering a direct comparison with the available experimental data on QPC in Hall bars [30,54,55,56]. We first find that neutral mode dynamics may be detected in the current behaviour of single-qp for low enough temperatures.…”

Section: Introductionmentioning

confidence: 93%

“…These, indeed, are less sensible to temperatures and show plateaux structures that can be interpreted in terms of dominant contributions of different tunnelling charges. We show that the comparison between different current cumulants behaviour can be a unique resource to correctly interpret the physics of this crossover phenomena [30,55,56,57]. The outline of the paper is the following.…”

Section: Introductionmentioning

confidence: 99%

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Neutral modes' edge state dynamics through quantum point contacts

Ferraro

Braggio²,

Magnoli

et al. 2010

New J. Phys.

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Dynamics of neutral modes for fractional quantum Hall states is investigated for a quantum point contact geometry in the weak-backscattering regime. The effective field theory introduced by Fradkin-Lopez for edge states in the Jain sequence is generalized to the case of propagating neutral modes. The dominant tunnelling processes are identified also in the presence of non-universal phenomena induced by interactions. The crossover regime in the backscattering current between tunnelling of single-quasiparticles and of agglomerates of p-quasiparticles is analysed. We demonstrate that higher order cumulants of the backscattering current fluctuations are a unique resource to study quantitatively the competition between different carrier charges. We find that propagating neutral modes are a necessary ingredient in order to explain this crossover phenomena.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Neutral modes' edge state dynamics through quantum point contacts

Ferraro

Braggio²,

Magnoli

et al. 2010

New J. Phys.

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“…Finally, for the sake of completeness, we mention that for fractional quantum Hall systems in the strong backscattering regime, super-Poissonian noise has been observed in DC shot noise measurements. Indeed, it has been shown that 38 at sufficiently low temperatures, the effective charge which tunnels from one quantum Hall fluid to the other, as analyzed by the ratio S(ω = 0)/ I(t) , can be equal to 2e or can be even larger. These experiments suggest that the relevant tunneling process involves pairs -or groups -of electrons.…”

Section: Strong Backscattering Limitmentioning

confidence: 99%

Photo-assisted shot noise in the fractional quantum Hall regime

Crépieux

Devillard

Martin

2005

AIP Conference Proceedings

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The effect of an ac perturbation on the shot noise of a fractional quantum Hall fluid is studied at finite temperature. For a normal metal, it is known that the zero-frequency noise derivative exhibits steps as a function of bias voltage. In contrast, at Laughlin fractions, the backscattering noise exhibits evenly spaced singularities, which are reminiscent of tunneling density-of-states singularities for quasiparticles. The spacing is determined by the quasiparticle charge $\nu e$ and the ratio of the dc bias with respect to the drive frequency. Photo-assisted transport can thus be considered as a probe for effective charges of the quantum Hall effect.Comment: Proceeding of the 18th International Conference on Noise and Fluctuations, Salamanca, Spai

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“…The above analysis shows that the quasiparticle charge of a fractional quantum Hall state can be estimated by fitting the non-linear conductance transition, which agrees well with the thermal activation measurement in a highly open QPC. These measurement techniques can be used to confirm the reported shot noise measurement results, for example the observation of super Poissonian noise in fractional quatum Hall regime [29] and the observation of e/3 charge through a local fractional quantum Hall state in a QPC at ν = 1 quantum Hall state [21].…”

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confidence: 94%

Nontrivial transition of transmission in a highly open quantum point contact in the quantum Hall regime

et al. 2017

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The transmission through a quantum point contact (QPC) in the quantum Hall regime usually exhibits multiple resonances as a function of gate voltage and high non-linearity in bias. Such behavior is unpredictable and changes sample by sample. Here, we report observation of sharp transition of the transmission through an open QPC at finite bias which was consistently observed for all the tested QPCs. It is found that the bias dependence of the transition can be fitted to the Fermi-Dirac distribution function through universal scaling. The fitted temperature matches quite nicely to the electron temperature measured via shot noise thermometry. While the origin of the transition is unclear, we propose a phenomenological model based on our experimental results, which may help to understand such a sharp transition. Similar transitions are observed in the fractional quantum Hall regime and it is found that the temperature of the system can be measured by rescaling the quasiparticle energy with the effective charge (e * = e/3). We believe that the observed phenomena can be exploited as a tool for measuring the electron temperature of the system and for studying the quasiparticle charges of the fractional quantum Hall states.A quantum point contact (QPC) [1,2] is the most essential building block of the quantum devices such as quantum dots [3], electron interferometers [4,5], etc [6,7]. In the quantum Hall (QH) regime [8], it is used to control tunneling between counter propagating edge states, and it provides a useful tool to measure the fractional charge via the shot noise measurement [9][10][11][12]. However, the transmission through a QPC usually exhibits multiple resonances as a function of QPC gate voltages and high non-linearity in bias. Such resonances and non-linear behaviors often hamper to develop ideal quantum devices.The resonance peaks observed near pinch-off region resemble those of a quantum dot and are explained by the tunneling through localized states in the QPC gap [13][14][15]. The exstence of such localized states in an almost closed QPC can be measured as coulomb diamonds and were used as an electron thermometry by Altimiras and coworkers [16]. However, when the QPC is partially open, the resonant peaks are superposed by many other resonances randomly, hence making it very difficult to study their transport behavior systematically. Such random overlap between resonant peaks were usually regarded as the resonant tunneling through multiple localized states which can exist in a rather open QPC. Hence, not much attention has been paid until now. Here, we report sharp transition of the transmission at finite bias for a highly open QPC, which is observed consistently for all the QPCs we have tested. Moreover, it cannot be explained by overlap of multiple resonant peaks. We found that the shape of the transition step is exactly proportional to the Fermi-Dirac distribution function (not the derivative of the distribution function). Also, all the * ycchung@pusan.ac.kr † hkchoi@jbnu.ac.kr sharp transition tra...

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Super Poissonian noise in the FQHE regime

Cited by 7 publications

References 14 publications

Neutral modes' edge state dynamics through quantum point contacts

Neutral modes' edge state dynamics through quantum point contacts

Photo-assisted shot noise in the fractional quantum Hall regime

Nontrivial transition of transmission in a highly open quantum point contact in the quantum Hall regime

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