Electric field tuning of dynamical dielectric function in phosphorene

• Published in: Chemical physics letters 2019-09, Vol.731, p.136606, Article 136606
• Main Authors: Pham, Khang D., Hieu, Nguyen N., Davoudiniya, Masoumeh, Phuong, Le T.T., Hoi, Bui D., Nguyen, Chuong V., Phuc, Huynh V., Van, Pham T.C., Phong, Tran C.
• Format: Article
• Language: English
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2019.136606

[Display omitted] •Anisotropic electro-optical properties of monolayer black phosphorus in the presence electric field effects are investigated.•For the frequencies beneath the band gap, the refraction (absorption) along the armchair direction of phosphorene is smaller (larger) than the zigzag direction.•For the frequencies above the band gap, the dynamical dielectric function decreases with the electric field independent of the direction. We present electric field effects on the optical field-dependent dielectric function of phosphorene. We use a two-band model and the Kubo formula to obtain refractive index and absorption coefficient. From our findings, the refraction (absorption) along the armchair direction is smaller (larger) than the zigzag direction for the optical energies close to and larger than the band gap. Moreover, we find that for frequencies beneath the band gap, dynamical dielectric function decreases with the electric field independent of the orientation, whereas there is a strong anisotropic treatment above the band gap.