Terasonic Excitations in 2D Gold Nanoparticle Arrays in a Water Matrix as Revealed by Atomistic Simulations
| Autor: | Yong Q. Cai, Alessandro Cunsolo, Dmitry Zav’yalov, Dima Bolmatov, Mikhail Zhernenkov |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Terahertz radiation Scattering Physics::Optics Nanoparticle Metamaterial Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Molecular dynamics General Energy Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Soft matter Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology Nanoscopic scale Kohn anomaly |
| Zdroj: | The Journal of Physical Chemistry C. 120:19896-19903 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | In this work we report on terahertz phononic excitations in two-dimensional (2D) gold nanoparticle arrays in a water matrix through a series of large-scale molecular dynamics simulations. For the first time, we observe acoustic Dirac-like crossings in H (H2O) atomic (molecular) networks that emerge due to an intraband phononic scattering. These crossings are the phononic fingerprints of ice-like arrangements of H (H2O) atomic (molecular) networks at nanometer scale. We reveal how phononic excitations in metallic nanoparticles and the water matrix reciprocally impact on one another providing the mechanism for the THz phononics manipulation via structural engineering. Furthermore, we show that by tuning the arrangement of 2D gold nanoparticle assemblies, the Au phononic polarizations experience subterahertz hybridization (Kohn anomaly) due to surface electron–phonon relaxation processes. This opens the way for the sound control and manipulation in soft matter metamaterials at nanoscale. |
| Databáze: | OpenAIRE |
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