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We investigate the plasmons in bilayer black phosphorus (BP) with bias-drivenformation of Dirac cones, by developing an effective two-band Hamiltonian thatcaptures this electronic transition with great accuracy. We show that theappearance of the Dirac cones lead to additional linearly dispersing acousticplasmon mode, in conjunction to the conventional plasmon. In addition, thechange in the Fermi surface topology from a disc to ring or dual pockets alsomodifies the dielectric loss.

Plasmons in bias-induced topological phase transition in black phosphorus