Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots

Molecular electronics is a scientific endeavour that, for 60 years, has offered the promise of new technologies in which molecules integrate with, if not entirely replace, semiconductor electronics. En route to the attainment of these ambitious goals, central aspects underpinning the pursuit of this science have proven critical to the development of related technologies, including organic photovoltaics (OPV) and organic light-emitting diodes (OLEDs). Looking ahead, new opportunities in the field abound, from the study of molecular charge transport and the elucidation of molecular reaction mechanisms, to the development of biocompatible and degradable electronics, and the construction of novel chemical sensors with exquisite sensitivity and specificity. This article reviews historical developments in molecular electronics, with a particular focus on Australia’s contributions to the area. Australia’s current activity in molecular electronics research is also summarised, highlighting the capacity to both advance fundamental knowledge and develop new technologies. Scientific aspects considered include capabilities in: single molecule and molecular–monolayer junction measurement; spectroscopic analysis of molecular components and materials; synthetic chemistry; computational analysis of molecular materials and junctions; and the development of theoretical concepts that describe the electrical characteristics of molecular components, materials and putative device structures. Technological aspects considered include various aspects of molecular material design and implementation, such as: OPV and OLED construction, sensing technologies and applications, and power generation from heat gradients or friction. Missing capabilities are identified, and a future pathway for Australian scientific and technological development envisaged.

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“…Modelling of noise in nanoscopic devices [229][230][231][232][233][234][235][236][237][238] James Cook, Daniel Kosov…”

Section: Referencesmentioning

confidence: 99%

Molecular electronics: an Australian perspective

Reimers

Low

2023

Aust. J. Chem.

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“…To identify the exact form of J, one could formally rewrite Eq. ( 9) as an n-resolved master equation [76] and include all terms associated with ρ (n−1) (t) [39]. However, one could also just directly identify those terms in Eq.…”

Section: B Born-markov Master Equationmentioning

confidence: 99%

“…where ↑ and ↓ correspond to signs of + and −, respectively. In the wideband limit, the renormalizations can be calculated analytically using the digamma function, ψ(x) [39]:…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…While a relatively recent addition to the analysis of charge fluctuations in open quantum systems [27], waiting time theory has developed rapidly in the last 10 years. Consequently, it has been used to investigate a wide variety of transport scenarios, such as tunneling through molecules with electron-electron [27][28][29][30] and electronphonon [31][32][33][34] interactions, telegraphic switching [35], double [36,37] and triple [38,39] quantum dots, superconducting junctions [40][41][42][43][44], coherent conductors [45][46][47], non-Markovian transport [48,49], periodically driven transport [50,51], and transport in the transient regime [52][53][54][55]. As opposed to the full counting statistics (FCS), which is the most prevalent method for analyzing charge fluctuations, the WTD provides information on transport at short timescales, particularly via correlations between successive waiting times [28,50,51,[56][57][58].…”

Section: Introductionmentioning

confidence: 99%

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Electronic statistics-on-demand: bunching, anti-bunching, positive and negative correlations in a molecular spin-valve

Davis,

Rudge,

Kosov

2021

Preprint

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One of the long-standing goals of quantum transport is to use the noise, rather than the average current, for information processing. However, achieving this requires on-demand control of quantum fluctuations in the electric current. In this paper, we demonstrate theoretically that transport through a molecular spin-valve provides access to many different statistics of electron tunneling events. Simply by changing highly tunable parameters, such as electrode spin-polarization, magnetization angle, and voltage, one is able to switch between Poisson behavior, bunching and antibunching of electron tunnelings, and positive and negative temporal correlations. The molecular spin-valve is modeled by a single spin-degenerate molecular orbital with local electronic repulsion coupled to two ferromagnetic leads with magnetization orientations allowed to rotate relative to each other. The electron transport is described via Born-Markov master equation and fluctuations are studied with higher-order waiting time distributions. For highly magnetized parallel-aligned electrodes, we find that strong positive temporal correlations emerge in the voltage range where a second transport channel opens. These are caused by a spin-induced bottleneck, which does not manifest in the stationary current alone.

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Current-induced forces in nanosystems: A hierarchical equations of motion approach

Rudge

Thoss

2023

Phys. Rev. B

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Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots

Cited by 3 publications

References 79 publications

Molecular electronics: an Australian perspective

Molecular electronics: an Australian perspective

Electronic statistics-on-demand: bunching, anti-bunching, positive and negative correlations in a molecular spin-valve

Current-induced forces in nanosystems: A hierarchical equations of motion approach

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