Publication Type:Journal Article
Source:Physical Review Letters, Volume 111, Number 3 (2013)
Keywords:Absorption measurements, Amorphous nanoparticles, Burstein-Moss shift, Crystalline materials, Crystalline nanoparticles, Energy gap, Free carrier density, light absorption, Localized surface plasmon resonance, nanoparticles, Plasmonic properties, Plasmons, scanning tunneling microscopy, Scanning tunneling spectroscopy, Surface plasmon resonance
Infrared absorption measurements of amorphous and crystalline nanoparticles of GeTe reveal a localized surface plasmon resonance (LSPR) mode in the crystalline phase that is absent in the amorphous phase. The LSPR mode emerges upon crystallization of amorphous nanoparticles. The contrasting plasmonic properties are elucidated with scanning tunneling spectroscopy measurements indicating a Burstein-Moss shift of the band gap in the crystalline phase and a finite density of electronic states throughout the band gap in the amorphous phase that limits the effective free carrier density. © 2013 American Physical Society.
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