Long-lived circulating currents in strongly correlated nanorings

Schoenauer, Benedikt; Gergs, Niklas M.; Schmitteckert, Peter; Evers, Ferdinand; Schuricht, Dirk

doi:10.1103/physrevresearch.1.022006

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…This includes the effect of magnetic fluxes on occupation numbers and the current-voltage characteristics (Rai, Hod, andNitzan, 2011, 2012;Bedkihal, Bandyopadhyay, and Segal, 2013) and the interplay of spin-flip scattering and circular currents (Rai and Galperin, 2012). Transient phenomena have been investigated in detail (Tu et al, 2012(Tu et al, , 2016Schoenauer et al, 2019), and effects of electronic correlations have also been addressed (Nuss, von der Linden, and Arrigoni, 2014).…”

Section: Qi and Ring Currentsmentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

et al. 2020

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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.

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Section: Qi and Ring Currentsmentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

et al. 2020

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“…10). Moreover, the presence of an imbalance in the occupation of opposite angular momentum states opens the question about circular currents triggered by the coupling to the leads and their feedback on the electronic structure of the molecule [61].…”

Section: Lamb Shift Contribution To the Preparationmentioning

confidence: 99%

Spin-orbit interaction induces charge beatings in a lightwave-STM single molecule junction

Frankerl,

Donarini

2020

Preprint

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Recent lightwave-STM experiments have shown space and time resolution of single molecule vibrations directly on their intrinsic length and time scales. We address here theoretically the electronic dynamics of a copper-phthalocynanine in a lightwave-STM, explored within a pump-probe cycle scheme. The spin-orbit interaction in the metallic center induces beatings of the electric charge flowing through the molecule as a function of the delay time between the pump and the probe pulses. Interference between the quasi-degenerate anionic states of the molecule and the intertwined dynamics of the associated spin and pseudospin degrees of freedom are the key aspects of such phenomenon. We study the dynamics directly in the time domain within a generalized master equation approach.

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“…This includes the effect of magnetic fluxes on occupation numbers and the current-voltage characteristics (Bedkihal et al, 2013;Rai et al, 2012Rai et al, , 2011, and the interplay of spin-flip scattering and circular currents (Rai and Galperin, 2012). Transient phenomena have been investigated in detail (Schoenauer et al, 2018;Tu et al, 2016Tu et al, , 2012 and also effects of electronic correlations have been addressed (Nuss et al, 2014).…”

Section: Qi and Ring Currentsmentioning

confidence: 99%

Advances and challenges in single-molecule electron transport

Evers,

Korytár,

Tewari

et al. 2019

Preprint

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Electronic transport properties for single-molecule junctions have been widely measured by several techniques, including mechanically controllable break junctions, electromigration break junctions or 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 quite 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. Many reasons for quantitative discrepancies can be identified, from which one may decide that qualitative agreement is the best one may expect with present modeling tools. 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 towards including dynamic image charges, electron correlations, and polaron formation.

show abstract

Long-lived circulating currents in strongly correlated nanorings

Cited by 6 publications

References 32 publications

Advances and challenges in single-molecule electron transport

Advances and challenges in single-molecule electron transport

Spin-orbit interaction induces charge beatings in a lightwave-STM single molecule junction

Advances and challenges in single-molecule electron transport

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