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Optical signatures of nonlocal plasmons in graphene

Tobias Wenger (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Giovanni Viola (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Mikael Fogelström (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; Philippe Tassin (Institutionen för fysik, Kondenserade materiens teori (Chalmers)) ; Jari M. Kinaret (Institutionen för fysik, Kondenserade materiens teori (Chalmers))
Physical Review B. Condensed Matter and Materials Physics (1098-0121). Vol. 94 (2016), 20, p. 205419.
[Artikel, refereegranskad vetenskaplig]

We theoretically investigate under which conditions nonlocal plasmon response in monolayer graphene can be detected. To this purpose, we study optical scattering off graphene plasmon resonances coupled using a subwavelength dielectric grating. We compute the graphene conductivity using the random phase approximation (RPA) obtaining a nonlocal conductivity, and we calculate the optical scattering of the graphene-grating structure. We then compare this with the scattering amplitudes obtained if graphene is modeled by the local RPA conductivity commonly used in the literature. We find that the graphene plasmon wavelength calculated from the local model may deviate up to 20% from the more accurate nonlocal model in the small-wavelength (large-q) regime. We also find substantial differences in the scattering amplitudes obtained from the two models. However, these differences in response are pronounced only for small grating periods and low temperatures compared to the Fermi temperature.

Nyckelord: graphene, plasmons



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Denna post skapades 2016-12-05. Senast ändrad 2017-07-03.
CPL Pubid: 245836

 

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