Plasmons and screening in monolayer and multilayer black phosphorus

Tony Low, Rafael Roldán, Han Wang, Fengnian Xia, Phaedon Avouris, Luis Martín Moreno, Francisco Guinea

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Black phosphorus exhibits a high degree of band anisotropy. However, we find that its in-plane static screening remains relatively isotropic for momenta relevant to elastic long-range scattering processes. On the other hand, the collective electronic excitations in the system exhibit a strong anisotropy. Band nonparabolicity, due to interband couplings, leads to a plasmon frequency which scales as nβ, where n is the carrier concentration, and β<12. Screening and charge distribution in the out-of-plane direction are also studied using a nonlinear Thomas-Fermi model.

Original languageEnglish (US)
Article number106802
JournalPhysical review letters
Issue number10
StatePublished - Sep 4 2014

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© 2014 American Physical Society.

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