Resonant transport and electrostatic effects in single-molecule electrical junctions
In this contribution we demonstrate structural control over a transport resonance in HS(CH2)n[1,4 −C6H4](CH2)nSH (n = 1, 3, 4, 6) metal-molecule-metal junctions, fabricated and tested using the scanning tunnelingmicroscopy-based I (z)method. The Breit-Wigner resonance originates from one of the aren...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2015 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/672670 |
| Acceso en línea: | http://hdl.handle.net/10486/672670 https://dx.doi.org/10.1103/PhysRevB.91.195438 |
| Access Level: | acceso abierto |
| Palabra clave: | Transport resonance Electrostatic effects Fermi energy Metal-molecule interface Física |
| Sumario: | In this contribution we demonstrate structural control over a transport resonance in HS(CH2)n[1,4 −C6H4](CH2)nSH (n = 1, 3, 4, 6) metal-molecule-metal junctions, fabricated and tested using the scanning tunnelingmicroscopy-based I (z)method. The Breit-Wigner resonance originates from one of the arene π-bonding orbitals, which sharpens and moves closer to the contact Fermi energy as n increases. Varying the number of methylene groups thus leads to a very shallow decay of the conductance with the length of the molecule. We demonstrate that the electrical behavior observed here can be straightforwardly rationalized by analyzing the effects caused by the electrostatic balance created at the metal-molecule interface. Such resonances offer future prospects in molecular electronics in terms of controlling charge transport over longer distances, and also in single-molecule conductance switching if the resonances can be externally gated |
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