Programme

P.34 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Optical transitions and Hofstadter spectra of monolayer TMDCs: a tight-binding investigation

Tran Khoi Nguyen (1), Dao Duy Tung (1), Huynh Thanh Duc (2)

(1) University of Science; (2) Institute of Advanced technology, Vietnam Academy of Science and technology

We investigate optical transitions and Hofstadter spectra of group-VIB transition metal dichalcogenide monolayers using a three-band tight-binding model with up to third-nearest-neighbor hoppings. For zero magnetic field, we calculate the optical matrix elements as well as the optical selection rules and compare them with the results from the k.p and ab-initio methods. In the presence of an external magnetic field, the calculated band energies show Landau levels at small fields and become fractal-structured at strong fields, which is known as the Hofstadter butterfly.

Presenter: Tran Khoi Nguyen