D.Le D-K, Nguyen QK, Truong TH, Le HV. Exciton energy in monolayer titanium trisulfide from second-order perturbation theory. TCKH ĐHSP TPHCM TPHCM [Internet]. 2026 Aug. 27 [cited 2026 Sep. 13];23(8). Available from: https://journal.hcmue.edu.vn/index.php/hcmuejos/article/view/5741