Programme

P.42 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Light absorbed by Dirac electrons in silicene under a non-uniform magnetic field

Huynh V. Phuc (1), Pham T. Vinh (1), Bui N. Thu (1), Tran N. Bich (2), Le T. Hoa (3), Le Dinh (3)

(1) Dong Thap University (2) The University of Da Nang (3) Hue University

We study the magneto-optical absorption of Dirac electrons in monolayer silicene under a perpendicular electric field and a non-uniform magnetic field. Using the equation of motion method within linear response theory, we compute longitudinal and Hall susceptibilities, focusing on both intraband and interband transitions. The optical response is strongly dependent on electron density, which shifts the Fermi level and modifies transition pathways. Higher densities lead to blue-shifted interband thresholds and enhanced intraband peaks. Circular polarization plays a key role: left-handed light enhances absorption, while right-handed light suppresses it. A characteristic “half-peak” emerges due to asymmetric Pauli blocking. While the magnetic field effectively tunes the absorption spectrum through Landau level modulation, the electric field has a weaker influence under strong quantization. These results highlight the tunable magneto-optical behavior of Dirac electrons in silicene, suggesting potential applications in polarization-sensitive and field-controlled optoelectronic devices.

Presenter: Huynh V. Phuc