Spin-charge separation of plasmonic excitations in thin topological insulators
Spin-charge separation of plasmonic excitations in thin topological insulators
We discuss plasmonic excitations in a thin slab of a topological insulators. In the limit of no hybridization of the surface states and same electronic density of the two layers, the electrostatic coupling between the top and bottom layers leads to optical and acoustic plasmons which are purely charge and …