Probing the topological phase transition via density oscillations in silicene and germanene
Probing the topological phase transition via density oscillations in silicene and germanene
We theoretically investigated two kinds of density oscillations, the Friedel oscillation and collective excitation in the silicene and germanene within the random phase approximation, and found that the tunable spin-valley coupled band structure could lead to some exotic properties in these two phenomena. Based on an exact analytical and numerical …