Single-molecule quantum-transport phenomena in break junctions

Gehring, Pascal; Thijssen, Jos; Zant, Herre S. J. van der

doi:10.1038/s42254-019-0055-1

Cited by 251 publications

(269 citation statements)

References 162 publications

(140 reference statements)

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“…[22] More importantly,D TBs offer the opportunity to introduce quantum interference for charge transportt hrough molecular junctions, which may lead to significant conductance difference compared with that without quantum interference. [23,24] Here, we report the single-molecule chargetransportcharacteristics of DTBs functionalized with particular Au-anchoring groups (Figure 1a). Utilizing the scanning tunneling microscopy-break-junction (STM-BJ) technique, we measured the singlemolecule conductance of two specific DTB isomers before and after the additiono ff luoridei ons in the solution (Figure 1b).…”

Section: Introductionmentioning

confidence: 89%

“…This effect was evidenced by monitoring the changes in electronic structure of different DTB isomers upon addition of fluoride ions, wherein resulting shifts in the boron coordination state led to spectroscopic changes ranging from very subtle to quite dramatic, depending on the strength of boron π‐conjugation in the respective isomers . More importantly, DTBs offer the opportunity to introduce quantum interference for charge transport through molecular junctions, which may lead to significant conductance difference compared with that without quantum interference …”

Section: Introductionmentioning

confidence: 99%

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Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Baghernejad

Dyck

Bergfield

et al. 2019

Chemistry A European J

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Providing a chemical control over charge transport through molecular junctions is vital to developing sensing applications at the single‐molecule scale. Quantum‐interference effects that affect the charge transport through molecules offer a unique chance to enhance the chemical control. Here, we investigate how interference effects can be harnessed to optimize the response of single molecule dithienoborepin (DTB) junctions to the specific coordination of a fluoride ion in solution. The single‐molecule conductance of two DTB isomers is measured using scanning tunneling microscopy break‐junction (STM‐BJ) before and after fluoride ion exposure. We find a significant change of conductance before and after the capture of a fluoride ion, the magnitude of which depends on the position of the boron atom in the molecular structure. This single‐molecule sensor exhibits switching ratios of up to four orders of magnitudes, suggesting that the boron–fluoride coordination can lead to quantum‐interference effects. This is confirmed by a quantum chemical characterization, pointing toward a cross‐conjugated path through the molecular structure as the origin of the effect.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Baghernejad

Dyck

Bergfield

et al. 2019

Chemistry A European J

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“…When the electron wave function in two transport pathways of molecular wire are of the same phase, constructive QI will occur and can improve the electrical transport. On the other hand, when the phase difference between two wave functions is π, destructive QI will occur and suppress electrical transport . As a unique quantum effect of nanoscale electrical transport, the QI effect can modulate the electrical transport capacity over a considerable range, which is of great significance for improving the energy conversion efficiency of nano‐organic thermoelectric devices.…”

Section: Optimization Strategies For Ote Devicesmentioning

confidence: 99%

Nanoscale Organic Thermoelectric Materials: Measurement, Theoretical Models, and Optimization Strategies

Zeng

Cao

et al. 2019

Adv Funct Materials

120

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The demands for waste heat energy recovery from industrial production, solar energy, and electronic devices have resulted in increasing attention being focused on thermoelectric materials. Over the past two decades, significant progress is achieved in inorganic thermoelectric materials. In addition, with the proliferation of wireless mobile devices, economical, efficient, lightweight, and bio‐friendly organic thermoelectric (OTE) materials have gradually become promising candidates for thermoelectric devices used in room‐temperature environments. With the development of experimental measurement techniques, the manufacturing for nanoscale thermoelectric devices has become possible. A large number of studies have demonstrated the excellent performance of nanoscale thermoelectric devices, and further improvement of their thermoelectric conversion efficiency is expected to have a significant impact on global energy consumption. Here, the development of experimental measurement methods, theoretical models, and performance modulation for nanoscale OTE materials are summarized. Suggestions and prospects for the future development of these devices are also provided.

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“…It should be noticed that the theoretical simulation also plays an important role in revealing the underlying mechanism of single‐molecule electrical or spin switches. The readers who are interested in this aspect can read some corresponding excellent theoretical reviews …”

Section: Introductionmentioning

confidence: 99%

Electrical and spin switches in single‐molecule junctions

Duan

Huang

et al. 2019

InfoMat

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Single-molecule electrical and spin switches have been one of the main research focuses in molecular electronics and spintronics because they may form the most important elements for the future information technology, thus attracting great attention in the scientific community and witnessing significant progresses benefiting from the combination of physics, chemistry, materials, and engineering. The key issue of constructing single-molecule switches is the development of stimulus-responsive systems that provide bistable or multiple states. In this review, we summarize the recent advances of this field in terms of the external stimulus that induces the switching. A variety of external stimuli, such as light, electric field, magnetic field, mechanical force, and chemical stimulus, have been successfully employed to activate the reversible switching in single-molecule junctions by manipulating molecular structures, conformations, electronic states, and spin states. As a burgeoning field, we finally put forward the challenges in molecular electronics and spintronics that need to be solved, which will initiate intense research. K E Y W O R D Selectrical switch, single-molecule junction, spin switch, stimuli-responsive system

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Single-molecule quantum-transport phenomena in break junctions

Abstract: Important note To cite this publication, please use the final published version (if applicable). Please check the document version above.

Cited by 251 publications

References 162 publications

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Quantum Interference Enhanced Chemical Responsivity in Single‐Molecule Dithienoborepin Junctions

Nanoscale Organic Thermoelectric Materials: Measurement, Theoretical Models, and Optimization Strategies

Electrical and spin switches in single‐molecule junctions

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