Electronic heat flow and thermal shot noise in quantum circuits

Sivre, E.; Duprez, H.; Anthore, A.; Aassime, A.; Parmentier, François; Cavanna, A.; Ouerghi, Abdelkarim; Gennser, U.; Pierre, F.

doi:10.1038/s41467-019-13566-8

Cited by 47 publications

(43 citation statements)

References 35 publications

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“…These considerations make the edge states of the FQHE a perfect testbed to examine delta-T noise. Beyond the inherent interest in studying delta-T noise in such systems, it may help better understanding charge and heat transport in situations where strong electronic correlations are operating [26]. The present Letter is an essential first step before more involved setups are considered, including, e.g., edge states involving neutral modes [27,28] or more exotic fractions, where intriguing transport properties associated with thermal effects have been uncovered recently [29,30].…”

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confidence: 93%

Negative Delta- T Noise in the Fractional Quantum Hall Effect

et al. 2020

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We study the current correlations of fractional quantum Hall edges at the output of a quantum point contact subjected to a temperature gradient. This out-of-equilibrium situation gives rise to a form of temperature-activated shot noise, dubbed delta-T noise. We show that the tunneling of Laughlin quasiparticles leads to a negative delta-T noise, in stark contrast with electron tunneling. Moreover, varying the transmission of the quantum point contact or applying a voltage bias across the Hall bar may flip the sign of this noise contribution, yielding signatures that can be accessed experimentally.

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confidence: 93%

Negative Delta- T Noise in the Fractional Quantum Hall Effect

et al. 2020

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“…Now, we relax this requirement and assume full thermalization inside the Ohmic contact, so the temperature T c is to be found from the energy balance equations (for the recent closely related analysis, which accounts for coupling to phonons, see Ref. [30]).…”

Section: Effects Of Heatingmentioning

confidence: 99%

Quantum ammeter: Measuring full counting statistics of electron currents at quantum timescales

Idrisov

Levkivskyi²,

Sukhorukov

2020

Phys. Rev. B

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We present the theoretical model of the quantum ammeter, a device that is able to measure the full counting statistics of an electron current at quantum timescales. It consists of an Ohmic contact perfectly coupled to chiral quantum Hall channels and of a quantum dot attached to one of the outgoing channels. At energies small compared to its charging energy, the Ohmic contact fractionalizes each incoming electron and redistributes it between outgoing channels. By monitoring the resonant tunneling current through the quantum dot, one gets access to the moment generator of the current in one of the incoming channels at timescales comparable to its correlation time.

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“…In contrast to the voltage-induced noise, the delta-T noise does not require a net flow of a non-equilibrium charge current. Since initial theoretical [42][43][44][45][46][47][48][49] and experimental [41,[50][51][52][53][54][55] work, it has been shown that non-equilibrium noise in the absence of currents is, in fact, a more general phenomenon than delta-T noise [56]. Still, what properties of nanoscale conductors-and, in particular, facets of their strongly-correlated nature-this class of zerocurrent non-equilibrium noise might reveal, remains an open and interesting question.…”

Section: Introduction a Background And Motivationmentioning

confidence: 99%

Does delta-$T$ noise probe quantum statistics?

Z¹,

Gornyi²,

Spånslätt³

2022

Preprint

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We study delta-T noise-excess charge noise at zero voltage but finite temperature bias-for weak tunneling in one-dimensional interacting systems. We show that the sign of the delta-T noise is generically determined by the nature of the dominating tunneling process. More specifically, the sign is governed by the leading charge-tunneling operator's scaling dimension. We clarify the relation between the sign of delta-T noise and the quantum exchange statistics of tunneling quasiparticles. We find that, for infinite systems hosting chiral channels with local interactions (e.g., quantum Hall or quantum spin Hall edges), when the delta-T noise is negative, the tunneling particles are boson-like, revealing their tendency towards bunching. However, the opposite is not true: Bosonlike particles do not necessarily produce negative delta-T noise. Importantly, the bosonic nature of particles generating the negative delta-T is not necessarily intrinsic, but can be induced by the interactions. This, in particular, implies that negative delta-T noise for tunneling between the edge states cannot serve as a smoking gun for detecting "intrinsic anyons". We also establish a connection between the delta-T noise and the temperature derivative of the Nyquist-Johnson (thermal) noise in interacting systems, both governed by the same scaling dimensions. As a demonstration of the above statements, we study tunneling between two interacting quantum spin Hall edges. With bosonization and renormalization-group techniques, we find that many-body interactions can generate negative delta-T noise for both direct tunneling through a point contact and in Kondo exchange tunneling via a localized spin. In both these setups, we show that the noise can become negative at sufficiently low temperatures, when interactions renormalize the tunneling to favor boson-like pair-tunneling of electrons rather than single-electron tunneling. Our findings show that delta-T noise can be used to probe the nature of collective excitations in interacting one-dimensional systems.

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Electronic heat flow and thermal shot noise in quantum circuits

Cited by 47 publications

References 35 publications

Negative Delta- T Noise in the Fractional Quantum Hall Effect

Negative Delta- T Noise in the Fractional Quantum Hall Effect

Quantum ammeter: Measuring full counting statistics of electron currents at quantum timescales

Does delta-$T$ noise probe quantum statistics?

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