Probing the Orbital Origin of Conductance Oscillations in Atomic Chains
| Autor: | Ran Vardimon, Ariel Biller, Tamar Yelin, Soumyajit Sarkar, Oren Tal, Leeor Kronik, Marina Klionsky |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Oscillation Mechanical Engineering Shot noise FOS: Physical sciences Conductance Bioengineering General Chemistry Electronic structure Condensed Matter Physics Molecular physics Symmetry (physics) Amplitude Atomic orbital Zigzag Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science |
| Zdroj: | Nano Letters. 14:2988-2993 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/nl4041737 |
| Popis: | We investigate periodical oscillations in the conductance of suspended Au and Pt atomic chains during elongation under mechanical stress. Analysis of conductance and shot noise measurements reveals that the oscillations are mainly related to variations in a specific conduction channel as the chain undergoes transitions between zigzag and linear atomic configurations. The calculated local electronic structure shows that the oscillations originate from varying degrees of hybridization between the atomic orbitals along the chain as a function of the zigzag angle. These variations are highly dependent on the directionality and symmetry of the relevant orbitals, in agreement with the order-of-magnitude difference between the Pt and Au oscillation amplitudes observed in experiment. Our results demonstrate that the sensitivity of conductance to structural variations can be controlled by designing atomic-scale conductors in view of the directional interactions between atomic orbitals. |
| Databáze: | OpenAIRE |
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