Anisotropic exciton Stark shift in black phosphorus

A. Chaves, Tony Low, P. Avouris, D. Çakır, and F. M. Peeters

Phys. Rev. B 91, 155311 – Published 27 April 2015

Abstract

We calculate the excitonic spectrum of few-layer black phosphorus by direct diagonalization of the effective mass Hamiltonian in the presence of an applied in-plane electric field. The strong attractive interaction between electrons and holes in this system allows one to investigate the Stark effect up to very high ionizing fields, including also the excited states. Our results show that the band anisotropy in black phosphorus becomes evident in the direction-dependent field-induced polarizability of the exciton.

Received 17 November 2014
Revised 30 March 2015

DOI:https://doi.org/10.1103/PhysRevB.91.155311

Authors & Affiliations

A. Chaves^1,*, Tony Low², P. Avouris³, D. Çakır⁴, and F. M. Peeters^4,1

¹Universidade Federal do Ceará, Departamento de Física Caixa Postal 6030, 60455-760 Fortaleza, Ceará, Brazil
²Electrical and Computer Engineering Department, University of Minnesota, 200 Union Street SE, 4-174 Keller Hall, Minneapolis, Minnesota 55455-0170, USA
³IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA
⁴Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium

^*andrey@fisica.ufc.br

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Vol. 91, Iss. 15 — 15 April 2015

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