Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.106802
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Funding
- Spanish Ministry of Economy (MINECO) [FIS2011-23713]
- European Research Council [290846]
- European Commission [CNECT-ICT-604391]
- Juan de la Cierva Program
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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 n(beta), where n is the carrier concentration, and beta < 1/2. Screening and charge distribution in the out-of-plane direction are also studied using a nonlinear Thomas-Fermi model.
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