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Abstract: We have investigated the Coulomb screening properties and plasmon spectrum ina bilayer graphene under a perpendicular electric bias. The bias voltageapplied between the two graphene layers opens a gap in the single particleenergy spectrum and modifies the many-body correlations and collectiveexcitations. The energy gap can soften the plasmon modes and lead to acrossover of the plasmons from a Landau damped mode to being undamped. Plasmonmodes of long lifetime may be observable in experiments and may have potentialsfor device applications.



Author: Xue-Feng Wang, Tapash Chakraborty

Source: https://arxiv.org/







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