Abstract:

We have investigated the Coulomb screening properties and plasmon spectrum in a bilayer graphene under perpendicular electric bias. The bias voltage applied between the two graphene layers opens a gap in the single particle energy spectrum and modifies the many-body correlation and collective excitations. The energy gap can soften the plasmon modes and lead to the crossover of plasmon from a Landau damped mode to undamped one. Plasmon modes of long lifetime may be observable in experiments and may have application potential.
 
 
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