Program

P.29 -- Poster, NCTP-40

Date: Monday, 27 July 2015

Time: 14h00 - 15h30

Surface optical phonon-assisted cyclotron resonance in graphene on a h-BN substrate

Huynh Vinh Phuc (1), Luong Van Tung (1), Le Dinh (2)

(1) Dong Thap University, Dong Thap, Viet Nam (2) College of Education, Hue University, Hue, Viet Nam

In this work, the influence of surface optical (SO) phonons on the phonon-assisted cyclotron resonance (PACR) effect has been theoretically studied in a single-layer graphene on h-BN substrates via both one and two-photon absorption processes. The two-photon absorption process gives a significant contribution to magneto-optical absorption coefficient (MOAC) compared to one-photon process. The shifts of the absorption peaks are larger for h-BN substrate than those in graphene on nonpolar substrates, where only the intrinsic optical phonons of graphene contribute. Effects of temperature, graphene-substrate separation, and magnetic field on the MOAC and the half width are discussed. Our results show that the h-BN substrate strongly influence on the magneto-optical absorption spectra not only in the magnitude but also in the position of the resonant peaks due to electron-SO phonon scattering.

Presenter: Huynh Vinh Phuc