Coexistence of Coulomb Blockade and Zero Bias Anomaly in a Strongly Coupled Nanodot

Bitton, L.; Gutman, D. B.; Berkovits, Richard; Frydman, A.

doi:10.1103/physrevlett.106.016803

Cited by 20 publications

(12 citation statements)

References 19 publications

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“…[8,9]. Experiments employing quantum dot thermometry [10,11,12,13], investigating electrical conduction in metallic nanodots [14] or granular films [15] work in this intermediate Coulomb blockade regime as well.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Primary Thermometry in the Intermediate Coulomb Blockade Regime

et al. 2013

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We investigate Coulomb blockade thermometers (CBT) in an intermediate temperature regime, where measurements with enhanced accuracy are possible due to the increased magnitude of the differential conductance dip. Previous theoretical results show that corrections to the half width and to the depth of the measured conductance dip of a sensor are needed, when leaving the regime of weak Coulomb blockade towards lower temperatures. In the present work, we demonstrate experimentally that the temperature range of a CBT sensor can be extended by employing these corrections without compromising the primary nature or the accuracy of the thermometer.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Primary Thermometry in the Intermediate Coulomb Blockade Regime

et al. 2013

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“…We note that although items (i), (ii) and (iv) are in qualitative agreement with our theory, observations (iii) and (v) are formally at odds with the observations of Refs. [26,21]. We note that feature (iii) can be related with the fact that the total tunneling conductance is not large enough (g ∼ 3) such that application of our theory is questionable.…”

Section: Final Resultsmentioning

confidence: 97%

“…In recent experiments [26,21] the electron transport via highly asymmetric SET at low temperatures was studied. For several samples with 1 < g < 10 distinct…”

Section: Final Resultsmentioning

confidence: 99%

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Two-instanton approximation to the Coulomb blockade problem

Burmistrov

2017

Low Temperature Physics

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We develop the two-instanton approximation to the current-voltage characteristic of a single electron transistor within the Ambegaokar-Eckern-Sch\"on model. We determine the temperature and gate voltage dependence of the Coulomb blockade oscillations of the conductance and the effective charge. We find that a small (in comparison with the charging energy) bias voltage leads to significant suppression of the Coulomb blockade oscillations and to appearance of the bias-dependent phase shift

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“…The most likely explanation for the gap observed in our experiment is that it arises from effect of exchangetype zero-bias anomaly (ZBA) on single electron tunnelling of Au NPs. Very recently, Bitton, et al reported that in the region, k B T<< e 2 /C and R t ~ R q , the effects of ZBA and CB would coexist in an isolated Au NP [24].…”

mentioning

confidence: 99%

Effect of exchange-type zero-bias anomaly on single-electron tunneling of Au nanoparticles

Sun

Yan

et al. 2011

Phys. Rev. B

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Using cryogenic scanning tunnelling microscopy and scanning tunnelling spectroscopy we measured single electron tunnelling of isolated Au nanoparticles with 1.4 nm in radius. We observe that a gap ΔV ~ 2e/C (C is the capacitance of the Au particle) around zero bias in the tunnelling conductance spectrum, followed by a series of discrete single electron tunnelling peaks with voltage widths of E C ~ e/C at both negative and positive bias. Experimental data are well explained by taking into account the effect of exchange interaction of electrons on the single electron tunnelling of Au nanoparticles. A tunnelling peak near zero-bias was suppressed by the exchange-type zero-bias anomaly, which results in the gap ΔV ~ 2E C . Nanoparticles (NPs) are the subject of intense research at present, in part because they have opened up a new area of fundamental science and in part because of their longterm potential applications [1][2][3]. It is well-known that when put an individual nanoparticle (NP), isolated in an insulating barrier, between source and drain electrodes, then the NP acts as an island of electrons [4]. The tunnelling of electrons from the source through the particle to the drain can be inhibited at small bias voltages if the electrostatic energy e 2 /2C of a single excess electron on the particle is much larger than the thermal energy k B T, where C is the capacitance of the NP. Additionally, if the resistance R t of two tunnelling barriers between the NP and the two electrodes is much larger than quantum resistance R q = h/e 2 , which ensures that the wave function of an excess electron on the NP is localized there, the socalled Coulomb blockade (CB) could be observed. Since the pioneer experiment on CB of Fulton and Dolan [5], the single electron tunnelling behaviors of NP have attracted much attention [6][7][8][9][10][11][12][13]. Several groups explored unexpected phenomena of CB for ultrafine NP [14-16]. For example, it is found that the electronic wavefunctions of semiconductor quantum dots exhibit atomic-like symmetry and the semiconductor quantum dots can be treated as 'artificial atoms'. As a consequence, the separations of discrete single electron tunnelling for semiconductor quantum dots are determined by both the single electron charging energy and the discrete level spacings of the 'artificial atoms' [15]. These results indicate that the electronic properties of NP could influence itself the single electron tunnelling behavior.In this Letter, we measured single electron tunnelling of isolated Au nanoparticles with 1.4 nm in radius by using cryogenic scanning tunnelling microscopy (STM) and scanning tunnelling spectroscopy (STS). A gap ΔV ~ 2e/C (C is the capacitance of the Au particle) around zero bias, followed by a series of discrete single electron tunnelling peaks with voltage widths of E C ~ e/C at both negative and positive bias, is observed in the tunnelling conductance dI/dV spectrum. The appearance of the gap ΔV ~ 2E C and the magnitude of conductance peaks in the differential conductance...

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Coexistence of Coulomb Blockade and Zero Bias Anomaly in a Strongly Coupled Nanodot

Cited by 20 publications

References 19 publications

Primary Thermometry in the Intermediate Coulomb Blockade Regime

Primary Thermometry in the Intermediate Coulomb Blockade Regime

Two-instanton approximation to the Coulomb blockade problem

Effect of exchange-type zero-bias anomaly on single-electron tunneling of Au nanoparticles

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