| Autor: |
Frisenda R; Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA, The Netherlands., van der Zant HS; Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA, The Netherlands. |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2016 Sep 16; Vol. 117 (12), pp. 126804. Date of Electronic Publication: 2016 Sep 16. |
| DOI: |
10.1103/PhysRevLett.117.126804 |
| Abstrakt: |
We have investigated charge transport in single-molecule junctions using gold nanoelectrodes at room and cryogenic (10 K) temperatures. A statistical analysis of the low-bias conductance, measured during the stretching of the molecular junctions, shows that the most probable single-molecule conductance is insensitive to the temperature as expected for off-resonant coherent transport. Low-temperature current-voltage measurements show that these junction conformations have a smooth tunnelinglike shape. While separating the electrodes further we find that, in about one-fourth of the cases, the junction switches in an abrupt way to a configuration with I-V characteristics exhibiting a gap around zero bias and resonances at finite bias. The analysis of the I-V shape and of the conductance distance dependence suggests a stretching-induced transition from the strong to the weak electronic coupling regime. The transition involves a large renormalization of the injection barrier and of the electronic coupling between the molecule and the electrodes. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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