Naslov
Propagators and spectra of surface polaritons in metallic slabs: Effects of quantum-mechanical nonlocality

Autori
Despoja, Vito ; Šunjić, Marijan ; Marušić, Leonardo

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
28th International Brandt Ritchie Workshop

Mjesto i datum
Madrid, Španjolska, 24.05.2009. - 27.05.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
surface polariton ; retardation ; enhanced radiation

Sažetak
Polariton propagator for thin aluminium slab is constructed by using $\phi=0$ gauge and nonlocal conductivity tensor which is constructed by using LDA Kohn-Sham wave functions. Dyson equation for the polariton propagator is divided in $s$ and $p$ part, and each part is solved in two steps. First step is solving the Dyson equation with only paramagnetic (non-local) part of photon selfenergy included, and second step is renormalization of such propagator because of its interaction with diamagnetic (local) polarizations. This approach enabled us to investigate these two polarization mechanisms independently of one another for the first time, as well as their mutual influence. The method is used to calculate spectra of electromagnetic excitations in the vicinity and inside of a metallic slab. Enhanced electrical field which radiate point dipole placed inside metallic slab is calculated as well. In ultraviolet region (above $\omega_p$) paramagnetic (non-local) polarization strongly modify such enhancement, which is in contradiction with commonly used diamagnetic (local) description.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA