Electric Field-induced switching among multiple conductance pathways in single-molecule junctions

2021 ◽  
Author(s):  
Tengyang Gao ◽  
Zhichao Pan ◽  
Zhuanyun Cai ◽  
Jueting Zheng ◽  
Chun Tang ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Binding Sites ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Field Increase ◽  
Electric Field Increase ◽  
Single Molecule Junctions

Here, we report the switching among multiple conductance pathways achieved by sliding the scanning tunneling microscope tip among different binding sites under different electric fields. With the electric field increase,...

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 Connectivity dependent thermopower of bridged biphenyl molecules in single-molecule junctions

Nanoscale ◽  
2020 ◽  
Vol 12 (27) ◽  
pp. 14682-14688 ◽  
Author(s):  
Iain M. Grace ◽  
Gunnar Olsen ◽  
Juan Hurtado-Gallego ◽  
Laura Rincón-García ◽  
Gabino Rubio-Bollinger ◽  
...  
Keyword(s):  
Seebeck Coefficient ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Electrical Conductance ◽  
Scanning Tunneling ◽  
Break Junction ◽  
Tunneling Microscope ◽  
Single Molecule Junctions

We report measurements on gold|single-molecule|gold junctions, using a modified scanning tunneling microscope-break junction (STM-BJ) technique, of the Seebeck coefficient and electrical conductance of a series of bridged biphenyl molecules.

C70 close-packed surfaces and single molecule void-formation by local electric field through a scanning tunneling microscope tip

2009 ◽  
Vol 94 (4) ◽  
pp. 043107
Author(s):  
Yohei Ohta ◽  
Ryoji Mitsuhashi ◽  
Ryo Nouchi ◽  
Akihiko Fujiwara ◽  
Shojun Hino ◽  
...  
Keyword(s):  
Electric Field ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Void Formation ◽  
Local Electric Field ◽  
Scanning Tunneling ◽  
Tunneling Microscope

scholarly journals Tuning Single-Molecule Conductance by Controlled Electric Field-Induced trans-to-cis Isomerisation

2021 ◽  
Vol 11 (8) ◽  
pp. 3317
Author(s):  
C.S. Quintans ◽  
Denis Andrienko ◽  
Katrin F. Domke ◽  
Daniel Aravena ◽  
Sangho Koo ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Single Molecule ◽  
Quantum Interference ◽  
Single Molecule Level ◽  
Wet Chemical Synthesis ◽  
Single Molecule Junctions ◽  
Tunnelling Microscopy ◽  
The Difference

External electric fields (EEFs) have proven to be very efficient in catalysing chemical reactions, even those inaccessible via wet-chemical synthesis. At the single-molecule level, oriented EEFs have been successfully used to promote in situ single-molecule reactions in the absence of chemical catalysts. Here, we elucidate the effect of an EEFs on the structure and conductance of a molecular junction. Employing scanning tunnelling microscopy break junction (STM-BJ) experiments, we form and electrically characterize single-molecule junctions of two tetramethyl carotene isomers. Two discrete conductance signatures show up more prominently at low and high applied voltages which are univocally ascribed to the trans and cis isomers of the carotenoid, respectively. The difference in conductance between both cis-/trans- isomers is in concordance with previous predictions considering π-quantum interference due to the presence of a single gauche defect in the trans isomer. Electronic structure calculations suggest that the electric field polarizes the molecule and mixes the excited states. The mixed states have a (spectroscopically) allowed transition and, therefore, can both promote the cis-isomerization of the molecule and participate in electron transport. Our work opens new routes for the in situ control of isomerisation reactions in single-molecule contacts.

scholarly journals Many-Body State Description of Single-Molecule Electroluminescence Driven by a Scanning Tunneling Microscope

Nano Letters ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 2803-2811 ◽  
Author(s):  
Kuniyuki Miwa ◽  
Hiroshi Imada ◽  
Miyabi Imai-Imada ◽  
Kensuke Kimura ◽  
Michael Galperin ◽  
...  
Keyword(s):  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Scanning Tunneling ◽  
Many Body ◽  
Tunneling Microscope ◽  
Body State

scholarly journals How to control single-molecule rotation

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Grant J. Simpson ◽  
Víctor García-López ◽  
A. Daniel Boese ◽  
James M. Tour ◽  
Leonhard Grill
Keyword(s):  
Electric Field ◽  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Specific Interaction ◽  
Scanning Tunneling ◽  
Individual Molecule ◽  
Pivot Point ◽  
Dipolar Molecules ◽  
At Will ◽  
Orientation Of Molecules

Abstract The orientation of molecules is crucial in many chemical processes. Here, we report how single dipolar molecules can be oriented with maximum precision using the electric field of a scanning tunneling microscope. Rotation is found to occur around a fixed pivot point that is caused by the specific interaction of an oxygen atom in the molecule with the Ag(111) surface. Both directions of rotation are realized at will with 100% directionality. Consequently, the internal dipole moment of an individual molecule can be spatially mapped via its behavior in an applied electric field. The importance of the oxygen-surface interaction is demonstrated by the addition of a silver atom between a single molecule and the surface and the consequent loss of the pivot point.

DETECTING AND MANIPULATING SINGLE MOLECULES WITH STM

NANO ◽  
2006 ◽  
Vol 01 (01) ◽  
pp. 15-33 ◽  
Author(s):  
J. G. HOU ◽  
AIDI ZHAO
Keyword(s):  
Single Molecule ◽  
Scanning Tunneling Microscope ◽  
Light Emission ◽  
Single Molecules ◽  
Final Part ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
Recent Advances ◽  
Recent Developments ◽  
Single Molecule Manipulation

Scanning tunneling microscope (STM) is a powerful and unique tool for study single molecules. We review recent advances in single-molecule characterizations including direct STM imaging and I–V spectroscopy, dI/dV spectroscopy and mapping, and d2I/dV2 spectroscopy and mapping. Some recent experiments of STM-excited single-molecule light emission are also introduced. In the final part, recent developments of single-molecule manipulation with the STM as well as the applications are discussed.

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