PACS 73.20.Mf -Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) PACS 32.80.Qk -Coherent control of atomic interactions with photons PACS 78.68.+m -Optical properties of surfaces Abstract -Surface plasmon polaritons (SPPs) at the interfaces of composite media have some important properties not found in conventional SPPs, i.e., SPPs at metal-dielectric interfaces. We present a useful scheme to control basic features of SPPs at the interface between a tripod-type atomic system and a silver-silica (AgSiO2) composite film. There is some interaction between the SPPs at the interface and localized surface plasmons (LSPs) due to Ag-nanoparticles in the composite. We show that the SPP's dispersive properties are strongly dependent on the coherent driving fields applied in the atomic system. Similarly, the filling ratio of the nanoparticles in the composite and the incident wavelength also affect different features of the SPPs. Our model provides more degrees of freedom for tuning the fundamental properties of SPPs at the interfaces associated with composite media.

We investigate the time evolution of entanglement between two quantum dots in an engineered vacuum environment such that a metallic nanoring having a surface plasmon is placed near the quantum dots. Such engineering in environment results in oscillations in entanglement dynamics of the quantum dots systems. With proper adjustment of the separation between the quantum dots, entanglement decay can be stabilized and preserved for longer time than its decay without the surface plasmons interactions.

The phenomenon of self-induced transparency is shown to exist in a ferromagnetic system under a bias magnetic field.

We propose a coherent resonant tunneling model in double-barrier nanostructures in which besides an interference effect originated from coherent tunneling of single electron through two barriers, the effects of one-electron charging, discrete energy spectrum and electron interactions between barriers are also important. The interference effect, like that for light in Fabry–Perot cavity, will occur no matter whether a magnetic field exists or not, and is shown to have significant effect on the systems' tunneling current. Our model agrees surprisingly well with all the main experimental features of the phenomenon discovered by Scott Thomas et al.

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