scholarly journals Molecular attachment to a microscope tip: inelastic tunneling, Kondo screening, and thermopower

2019 ◽  
Vol 10 ◽  
pp. 1243-1250
Author(s):  
Rouzhaji Tuerhong ◽  
Mauro Boero ◽  
Jean-Pierre Bucher
Keyword(s):  
Single Molecule ◽  
Electron Tunneling ◽  
Vibrational Excitation ◽  
Scanning Tunneling ◽  
Clear Correlation ◽  
Inelastic Electron ◽  
Free Standing ◽  
Molecule Junction ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy

The vibrational excitation related transport properties of a manganese phthalocyanine molecule suspended between the tip of a scanning tunneling microsope (STM) and a surface are investigated by combining the local manipulation capabilities of the STM with inelastic electron tunneling spectroscopy. By attachment of the molecule to the probe tip, the intrinsic physical properties similar to those exhibited by a free standing molecule become accessible. This technique allows one to study locally the magnetic properties, as well as other elementary excitations and their mutual interaction. In particular a clear correlation is observed between the Kondo resonance and the vibrations with a strong incidence of the Kondo correlation on the thermopower measured across the single-molecule junction.

scholarly journals Binding Behavior of Carbonmonoxide to Gold Atoms on Ag(001)

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1578-1584
Author(s):  
David Kuhness ◽  
Jagriti Pal ◽  
Hyun Jin Yang ◽  
Nisha Mammen ◽  
Karoliina Honkala ◽  
...  
Keyword(s):  
Binding Sites ◽  
Density Functional ◽  
Electron Tunneling ◽  
Scanning Tunneling ◽  
Inelastic Electron ◽  
Tunneling Microscopy ◽  
Binding Behavior ◽  
Inelastic Electron Tunneling ◽  
Experimental Findings ◽  
Electron Tunneling Spectroscopy

AbstractThe adsorption behavior of single CO molecules at 4 K bound to Au adatoms on a Ag(001) metal surface is studied with scanning tunneling microscopy (STM) and inelastic electron tunneling spectroscopy (IETS). In contrast to earlier observations two different binding configurations are observed—one on top of a Au adatom and the other one adsorbed laterally to Au on Ag(001). Moreover, IETS reveals different low-energy vibrational energies for the two binding sites as compared to the one for a single CO molecule bound to Ag(001). Density functional theory (DFT) calculations of the adsorption energies, the diffusion barriers, and the vibrational frequencies of the CO molecule on the different binding sites rationalize the experimental findings.

scholarly journals Probing the local environment of a single OPE3 molecule using inelastic tunneling electron spectroscopy

2015 ◽  
Vol 6 ◽  
pp. 2477-2484 ◽  
Author(s):  
Riccardo Frisenda ◽  
Mickael L Perrin ◽  
Herre S J van der Zant
Keyword(s):  
Single Molecule ◽  
Electron Tunneling ◽  
Local Environment ◽  
Inelastic Electron ◽  
Phenylene Ethynylene ◽  
Electrode Separation ◽  
Quantum Chemistry Calculations ◽  
Single Molecule Junctions ◽  
Inelastic Electron Tunneling ◽  
Electron Tunneling Spectroscopy

We study single-molecule oligo(phenylene ethynylene)dithiol junctions by means of inelastic electron tunneling spectroscopy (IETS). The molecule is contacted with gold nano-electrodes formed with the mechanically controllable break junction technique. We record the IETS spectrum of the molecule from direct current measurements, both as a function of time and electrode separation. We find that for fixed electrode separation the molecule switches between various configurations, which are characterized by different IETS spectra. Similar variations in the IETS signal are observed during atomic rearrangements upon stretching of the molecular junction. Using quantum chemistry calculations, we identity some of the vibrational modes which constitute a chemical fingerprint of the molecule. In addition, changes can be attributed to rearrangements of the local molecular environment, in particular at the molecule–electrode interface. This study shows the importance of taking into account the interaction with the electrodes when describing inelastic contributions to transport through single-molecule junctions.

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