Possibility of like-charged particles to attract each other at negative permittivity

It is discussed whether like charges can be attracted to each other at a negative permittivity. The possibility of achieving negative permittivity in dielectric-conductor metamaterials due to localized surface plasmon resonance is shown. The possibility of manipulating the resonance frequency in a wide range of frequencies from zero to the plasma frequency by applying a magnetic or electric field is shown. The possibility of breakup of electron-hole pairs (exciton cold dissociation) and formation of electron-electron bound pairs at negative permittivity and nonzero frequency is discussed.