Doped semiconductor nanocrystals
represent an exciting new type
of plasmonic material with optical resonances in the infrared. Unlike
noble metal nanoparticles, the plasmon resonance can be tuned by altering
the doping density. Recently, it has been shown that silicon nanocrystals
can be doped using phosphorus and boron resulting in highly tunable
infrared plasmon resonances. Due to the band structure of silicon,
doping with phosphorus contributes light (transverse) and heavy (longitudinal)
electrons, while boron contributes light and heavy holes and one would
expect two distinct plasmon branches. Here we develop a classical
hybridization theory and a full quantum mechanical TDLDA approach
for two-component carrier plasmas and show that the interaction between
the two plasmon branches results in strongly hybridized plasmon modes.
The antibonding mode where the two components move in phase is bright
and depends sensitively on the doping densities. The low energy bonding
mode with opposite charge alignment can only be observed in the quantum
regime when strong Coulomb screening is present. The theoretical results
are in good agreement with the experimental data
Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.