Single-cluster electronics

2021 ◽  
Author(s):  
Timothy C. Siu ◽  
Joshua Y. Wong ◽  
Matthew O. Hight ◽  
Timothy A. Su
Keyword(s):  
Quantum Transport ◽  
Single Molecule ◽  
Transport Phenomena ◽  
Molecular Junctions ◽  
Cluster Compounds ◽  
Single Molecule Junctions ◽  
Structure And Bonding ◽  
Single Cluster ◽  
Specific Quantum ◽  
Inorganic Clusters

This article reviews the scope of inorganic cluster compounds measured in single-molecule junctions. The article explores how the structure and bonding of inorganic clusters give rise to specific quantum transport phenomena in molecular junctions.

scholarly journals Carbon tips for all-carbon single-molecule electronics

Nanoscale ◽  
2014 ◽  
Vol 6 (12) ◽  
pp. 6953-6958 ◽  
Author(s):  
Y. J. Dappe ◽  
C. González ◽  
J. C. Cuevas
Keyword(s):  
Ab Initio ◽  
Molecular Electronics ◽  
Single Molecule ◽  
Carbon Nanostructures ◽  
Molecular Junctions ◽  
Single Molecule Electronics ◽  
Single Molecule Junctions ◽  
Carbon Based

We present anab initiostudy of the use of carbon-based tips as electrodes in single-molecule junctions. We show that carbon tips can be combined with other carbon nanostructures to form all-carbon molecular junctions with molecules like benzene or C60. Results show that the use of carbon tips can lead to conductive molecular junctions and open new perspectives in all-carbon molecular electronics.

scholarly journals Enhanced coupling through π-stacking in imidazole-based molecular junctions

2019 ◽  
Vol 10 (43) ◽  
pp. 9998-10002 ◽  
Author(s):  
Tianren Fu ◽  
Shanelle Smith ◽  
María Camarasa-Gómez ◽  
Xiaofang Yu ◽  
Jiayi Xue ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Density Functional ◽  
Molecular Junctions ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Functional Theory ◽  
Tunneling Microscope ◽  
Single Molecule Junctions

We demonstrate that imidazole based π–π stacked dimers form strong and efficient conductance pathways in single-molecule junctions using the scanning-tunneling microscope-break junction (STM-BJ) technique and density functional theory-based calculations.

scholarly journals Exploring antiaromaticity in single-molecule junctions formed from biphenylene derivatives

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20659-20666
Author(s):  
Markus Gantenbein ◽  
Xiaohui Li ◽  
Sara Sangtarash ◽  
Jie Bai ◽  
Gunnar Olsen ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
Molecular Junctions ◽  
Single Molecule Junctions

We report the synthesis of a series of oligophenylene-ethynylene (OPE) derivatives with biphenylene core units, designed to assess the effects of biphenylene antiaromaticity on charge transport in molecular junctions.

scholarly journals Understanding resonant charge transport through weakly coupled single-molecule junctions

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
James O. Thomas ◽  
Bart Limburg ◽  
Jakub K. Sowa ◽  
Kyle Willick ◽  
Jonathan Baugh ◽  
...  
Keyword(s):  
Charge Transport ◽  
Single Molecule ◽  
Local Environment ◽  
Single Mode ◽  
Molecular Junctions ◽  
Vibrational Coupling ◽  
Weakly Coupled ◽  
Single Molecule Electronics ◽  
Single Molecule Junctions ◽  
Quantitative Understanding

Abstract Off-resonant charge transport through molecular junctions has been extensively studied since the advent of single-molecule electronics and is now well understood within the framework of the non-interacting Landauer approach. Conversely, gaining a qualitative and quantitative understanding of the resonant transport regime has proven more elusive. Here, we study resonant charge transport through graphene-based zinc-porphyrin junctions. We experimentally demonstrate an inadequacy of non-interacting Landauer theory as well as the conventional single-mode Franck–Condon model. Instead, we model overall charge transport as a sequence of non-adiabatic electron transfers, with rates depending on both outer and inner-sphere vibrational interactions. We show that the transport properties of our molecular junctions are determined by a combination of electron–electron and electron-vibrational coupling, and are sensitive to interactions with the wider local environment. Furthermore, we assess the importance of nuclear tunnelling and examine the suitability of semi-classical Marcus theory as a description of charge transport in molecular devices.

scholarly journals Environment-assisted quantum transport through single-molecule junctions

2017 ◽  
Vol 19 (43) ◽  
pp. 29534-29539 ◽  
Author(s):  
Jakub K. Sowa ◽  
Jan A. Mol ◽  
G. Andrew D. Briggs ◽  
Erik M. Gauger
Keyword(s):  
Charge Transfer ◽  
Quantum Transport ◽  
Single Molecule ◽  
Molecular Systems ◽  
Single Molecule Junctions

The celebrated mechanism of environment-assisted quantum transport is translated to the realm of charge transfer in molecular systems.

scholarly journals Single-molecule quantum-transport phenomena in break junctions

2019 ◽  
Vol 1 (6) ◽  
pp. 381-396 ◽  
Author(s):  
Pascal Gehring ◽  
Jos M. Thijssen ◽  
Herre S. J. van der Zant
Keyword(s):  
Quantum Transport ◽  
Single Molecule ◽  
Transport Phenomena ◽  
Break Junctions

Mechanically-Tunable Quantum Interference in Ferrocene-Based Single-Molecule Junctions

2020 ◽  
Author(s):  
María Camarasa-Gómez ◽  
Daniel Hernangómez-Pérez ◽  
Michael S. Inkpen ◽  
Giacomo Lovat ◽  
E-Dean Fung ◽  
...  
Keyword(s):  
Single Molecule ◽  
Quantum Interference ◽  
Degrees Of Freedom ◽  
Building Blocks ◽  
Ferrocene Derivative ◽  
Single Molecule Junctions ◽  
Molecule Junction ◽  
Single Molecule Junction ◽  
The Impact ◽  
D Orbitals

Ferrocenes are ubiquitous organometallic building blocks that comprise a Fe atom sandwiched between two cyclopentadienyl (Cp) rings that rotate freely at room temperature. Of widespread interest in fundamental studies and real-world applications, they have also attracted<br>some interest as functional elements of molecular-scale devices. Here we investigate the impact of<br>the configurational degrees of freedom of a ferrocene derivative on its single-molecule junction<br>conductance. Measurements indicate that the conductance of the ferrocene derivative, which is<br>suppressed by two orders of magnitude as compared to a fully conjugated analog, can be modulated<br>by altering the junction configuration. Ab initio transport calculations show that the low conductance is a consequence of destructive quantum interference effects that arise from the hybridization of metal-based d-orbitals and the ligand-based π-system. By rotating the Cp rings, the hybridization, and thus the quantum interference, can be mechanically controlled, resulting in a conductance modulation that is seen experimentally.<br>

Charge Transfer Complexation Boosts Molecular Conductance Through Fermi Level Pinning

2018 ◽  
Author(s):  
Kun Wang ◽  
Andrea Vezzoli ◽  
Iain Grace ◽  
Maeve McLaughlin ◽  
Richard Nichols ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Single Molecule ◽  
Quantum Interference ◽  
Transmission Function ◽  
Scanning Tunneling ◽  
Charge Transfer Complexes ◽  
Tunneling Microscopy ◽  
Quantum Interference Effect ◽  
Single Molecule Junctions ◽  
Charge Transfer Complexation

We have used scanning tunneling microscopy to create and study single molecule junctions with thioether-terminated oligothiophene molecules. We find that the conductance of these junctions increases upon formation of charge transfer complexes of the molecules with tetracyanoethene, and that the extent of the conductance increase is greater the longer is the oligothiophene, i.e. the lower is the conductance of the uncomplexed molecule in the junction. We use non-equilibrium Green's function transport calculations to explore the reasons for this theoretically, and find that new resonances appear in the transmission function, pinned close to the Fermi energy of the contacts, as a consequence of the charge transfer interaction. This is an example of a room temperature quantum interference effect, which in this case boosts junction conductance in contrast to earlier observations of QI that result in diminished conductance.<br>

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