Plasmons and Screening in Monolayer and Multilayer Black Phosphorus

Tony Low, Rafael Roldán, Han Wang, Fengnian Xia, Phaedon Avouris, Luis Martín Moreno, and Francisco Guinea
Phys. Rev. Lett. 113, 106802 – Published 4 September 2014
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Abstract

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.

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  • Received 15 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.106802

© 2014 American Physical Society

Authors & Affiliations

Tony Low1,2,5,*, Rafael Roldán3, Han Wang6, Fengnian Xia2, Phaedon Avouris1, Luis Martín Moreno4, and Francisco Guinea3

  • 1IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, USA
  • 2Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA
  • 3Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
  • 4Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, E-50009 Zaragoza, Spain
  • 5Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 6Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA

  • *tonyaslow@gmail.com

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Issue

Vol. 113, Iss. 10 — 5 September 2014

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