Full counting statistics of level renormalization in electron transport through double quantum dots

Abstract

We examine the full counting statistics of electron transport through double quantum dots coupled in series, with particular attention being paid to the unique features originating from level renormalization. It is clearly illustrated that the energy renormalization gives rise to a dynamic charge blockade mechanism, which eventually results in super-Poissonian noise. Coupling of the double dots to an external heat bath leads to dephasing and relaxation mechanisms, which are demonstrated to suppress the noise in a unique way.

Noise spectrum of quantum transport through double quantum dots: Renormalization and non-Markovian effects

“…(17b), it indicates that the super-Poissonian can be expected for asymmetrical coupling strength with Γ L ≪ Γ R . 17 Similar result for shot noise (fano factorF(0) = S(0)/2Ī) as expressed in Eq. (17b) has been obtained in Ref.…”

“…14,17 The numerically results are shown in Fig. 2 for wide band limit (WBL) suggesting the flat spectral density of the bath.…”

“…11 Recently, as a consequence of the quantum dots tunneling coupled with the electron reservoirs, the energy level renormalization effect has drawn attentions. [12][13][14][15][16][17] For the serial coupled double dots, the renormalization effect are obvious in the average current (or conductance) even in the limit of weak dot-reservoir coupling region. 14 It has also been demonstrated that the renormalization gave rise to a negative differential conductance 14,15 and super-Poissonian shot noise.…”

“…14 It has also been demonstrated that the renormalization gave rise to a negative differential conductance 14,15 and super-Poissonian shot noise. 17 However, lots of studies so far focus on the stationary current and the zero-frequency shot noise, [12][13][14][15][16][17] the investigation of this effect on the finite-frequency noise spectrum of the current fluctuations is still unavailable.…”

Quantum dot as spin current generator and energy harvester

“…It has been found inter alia that the thermoelectric figure of merit may be increased by Coulomb [50] and interference effects as well as direct hopping between the dots [51][52][53][54][55]. Impressive numerous experiments on the double quantum dots have to be noted [56][57][58][59] including those reporting the observation of the Kondo effect [60][61][62].…”