Kondo blockade due to quantum interference in single-molecule junctions

Mitchell, Andrew K.; Pedersen, Kim G. L.; Hedegård, Per; Paaske, Jens

doi:10.1038/ncomms15210

Cited by 42 publications

(39 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Kondo blockade. -Mitchell et al (2017) made an interesting prediction that the Kondo effect can lead to a suppression of the conductance, termed the Kondo blockade. The crucial condition for its realization is that the molecular spin is coupled to two independent conduction channels.…”

mentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

et al. 2020

View full text Add to dashboard Cite

Electronic transport properties of single-molecule junctions have been widely measured by several techniques, including mechanically controllable break junctions, electromigration break junctions, and by means of scanning tunneling microscopes. In parallel, many theoretical tools have been developed and refined for describing such transport properties and for obtaining numerical predictions. Most prominent among these theoretical tools are those based upon density functional theory. In this review, theory and experiment are critically compared, and this confrontation leads to several important conclusions. The theoretically predicted trends nowadays reproduce the experimental findings well for series of molecules with a single well-defined control parameter, such as the length of the molecules. The quantitative agreement between theory and experiment usually is less convincing, however. Two main sources for the quantitative discrepancies can be identified. Experimentally, the atomic structure of the junction typically realized in the measurement is not well known, so simulations rely on plausible scenarios. In theory, correlation effects can be included only in approximations that are difficult to control for experimentally relevant situations. Therefore, one typically expects qualitative agreement with present modeling tools; in exceptional cases a quantitative agreement has already been achieved. For further progress, benchmark systems are required that are sufficiently well defined by experiment to allow quantitative testing of the approximation schemes underlying the theoretical modeling. Several key experiments can be identified suggesting that the present description may even be qualitatively incomplete in some cases. Such key experimental observations and their current models are also discussed here, leading to several suggestions for extensions of the models toward including dynamic image charges, electron correlations, and polaron formation.

show abstract

mentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Soon after the advent of the first single-electron transistors in the late 1980s [1,2], with differential conductance plots governed by the hallmark Coulomb diamonds due to charging electrons one by one to the central quantum island [3,4], it became clear that the Kondo effect [5] would present a viable route to overcome the Coulomb blockade and to restore optimal conductivity. Kondo physics has since been observed in a large variety of nanoscale devices, ranging from the original GaAs/AlGaAs [6] and Si/SiGe [7] heterostructures to more exotic devices involving single-molecule junctions [8][9][10][11] or carbon nanotubes [12]. The sharpness of the concomitant zero-bias or Abrikosov-Suhl-Kondo resonance in the differential conductance [6][7][8][12][13][14][15] offers an attractive way to implement highly sensitive switching properties on which, e.g., future molecular electronics might depend [16,17].…”

mentioning

confidence: 99%

Kondo-assisted switching between three conduction states in capacitively coupled quantum dots

Lombardo

Hayn

Zhuravel

et al. 2020

Phys. Rev. Research

View full text Add to dashboard Cite

We propose a nanoscale device consisting of a double quantum dot with strong intra-and interdot Coulomb repulsions. In this design, the current can only flow through the lower dot, but is triggered by the gate-controlled occupancy of the upper dot. At low temperatures, our calculations predict the double dot to pass through a narrow Kondo regime, resulting in highly sensitive switching characteristics between three well-defined statesinsulating, normal conduction, and resonant conduction.

show abstract

“…are the coupling constants corresponding to the independent "even" and "odd" channels (i.e. linear combinations of the left and right channels) [31]. From here, it is immediately clear that the two independent channels are only coupled symmetrically if both J LL λ = J RR λ and J LR λ = 0, such that the presence of a non-zero J LR λ always leads to the one-channel ground state.…”

Section: Model Hamiltonian and Its Ground Statesmentioning

confidence: 82%

“…Applying Eq. (6.29) twice and taking the continuum limit of all momentum sums, we obtain 31) where Λ = 3Λ/2 is the cut-off of the redefined variable , and we used Eq. (6.13) with B = 0 for the dot Green function.…”

Section: Heat Transportmentioning

confidence: 99%