Programme

P.56 -- Poster, VCTP-44

Date: Thursday, 1 August 2019

Time: 08:30 - 10:00

Investigation of the magneto-dynamical dielectric function of monolayer phosphorene

Tran Cong Phong (1), Le Thi Thu Phuong (2), Doan Quoc Khoa (3), Bui Dinh Hoi (2)

(1) The Vietnam National Institute of Educational Sciences (2) University of Education, Hue University (3) Quang Tri Teacher Training College

In this investigation, we theoretically address the magnetic field effects on the frequency-dependent dynamical dielectric function, including the refractive index and the absorption coefficient, of phosphorene. An effective Hamiltonian model beyond the continuum approximation is employed to obtain the electronic dispersion energy and the linear response theory is applied to calculate the dynamical dielectric function at a certain temperature along both armchair and zigzag edges. Our numerical calculations show that, independent of the direction, the refraction (absorption) intensity decreases (increases) with the optical frequency at all magnetic field strengths. Moreover, we find out that the refraction and absorption processes along the armchair edge do not change after a critical magnetic field and this critical point increases with the optical frequency stemming from the spin-splitting effects. As for the zigzag edge, however, there is a little to no change for these processes with the magnetic field. Further, we observe that, in average, the dominant contribution to the total magnetic field-dependent dynamical dielectric function comes from the armchair edge originating from the smaller (larger) carrier effective mass (velocity) than the zigzag edge. Tuning the optical responses of phosphorene with the magnetic field is useful for practical spintronic applications.

Presenter: Bui Dinh Hoi