Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-28
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
This paper has been withdrawn by the authors as they made more complete understanding of the issue, making the presented inter
Scientific paper
We have carried out far-infrared (far-IR) transmission measurements on the ligand stabilized Au55 nanoparticles dispersed in Teflon at volume fractions ranging from 0.2% to 1%. Instead of a series of peaks which might arise from the electron transition between discrete energy levels, we have observed a broad far-IR absorption coefficient that follows with an onset at {\Delta} ~ 10 cm-1. Furthermore this frequency dependence is totally different from that of the expected absorption due to the induced electric dipole. The onset of the absorption reminiscent of an energy gap at ~ 10 cm-1 (~ 1. 2 meV) is surprisingly smaller than that of the expected for a metal sphere of 5.3 {\AA} in radius and independent of temperature. In this work we did not observe the level correlation effect on the far-IR absorption predicted for an ensemble of metal nanoparticles. It is concluded that Au55 nanoparticles behave like a three-dimensional (3D) semimetal with an energy gap {\Delta} ~ 10 cm-1 rather than a giant atom.
Kim Yeon Han
Schmid Günter
Zhao Xuandong
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