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Plasmons and screening in monolayer and multilayer black phosphorus

AuthorsLow, Tony; Roldán, Rafael ; Wang, Han; Xia, Fengnian; Avouris, Phaedon; Martín-Moreno, Luis; Guinea, F.
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 113: 106802 (2014)
AbstractBlack 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. © 2014 American Physical Society.
DescriptionUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.113.106802
Identifiersdoi: 10.1103/PhysRevLett.113.106802
issn: 0031-9007
e-issn: 1079-7114
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(ICMA) Artículos
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