Tunable bandgaps and excitons in doped semiconducting carbon nanotubes made possible by acoustic plasmons - Condensed Matter > Materials ScienceReport as inadecuate




Tunable bandgaps and excitons in doped semiconducting carbon nanotubes made possible by acoustic plasmons - Condensed Matter > Materials Science - Download this document for free, or read online. Document in PDF available to download.

Abstract: Doping of semiconductors is essential in modern electronic and photonicdevices. While doping is well understood in bulk semiconductors, the advent ofcarbon nanotubes and nanowires for nanoelectronic and nanophotonic applicationsraises some key questions about the role and impact of doping at lowdimensionality. Here we show that for semiconducting carbon nanotubes, bandgapsand exciton binding energies can be dramatically reduced upon experimentallyrelevant doping, and can be tuned gradually over a broad range of energies incontrast to higher dimensional systems. The later feature is made possible by anovel mechanism involving strong dynamical screening effects mediated byacoustic plasmons.



Author: Catalin D. Spataru, François Léonard

Source: https://arxiv.org/







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