Journal
PHYSICAL REVIEW B
Volume 82, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.155322
Keywords
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Funding
- NSF
- Volkswagen Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0933415] Funding Source: National Science Foundation
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Excitons and plasmons in hybrid semiconductor-metal nanostructures strongly interact via the Coulomb forces. Simultaneously, excitons in semiconductors experience typically strong intrinsic spin-dependent interactions that result in efficient coupling between spins of excitons and dynamic electric fields of photons. A joint action of the exciton-plasmon and spin-dependent interactions leads to a coupling between spins and plasmons. Calculated optical spectra of hybrid nanoparticle molecules reveal such spin-plasmon coupling. The spin-plasmon coupling creates spin-dependent Lamb shifts of excitons. In the presence of the exciton-plasmon interaction, the spin splitting in the exciton spectrum can decrease or even vanish under certain conditions. In a magnetic field, the spin-plasmon interaction strongly alters optical spin-dependent selection rules, leading to forbidden optical lines. Allowed and forbidden optical transitions in the presence of the exciton-plasmon and spin-plasmon interactions typically acquire Fano-type or antiresonance shapes. Plasmon-induced interactions in semiconductor-metal nanocrystal structures suggest interesting opportunities for tailoring of spin and optical spectra of excitons.
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