[14a-A404-3~11] 17.3 Layered materials

[14a-A404-5] Excitation energy dependence of valley polarization in monolayer WS₂ treated by organic acid

〇(B)Takashi Kimura¹, Asakura Eito¹, Jack Alexander-Webber², Arelo O.A Tanoh³, Hope Bretscher³, Akshay Rao^3,4, Junsaku Nitta¹, Makoto Kohda¹ (1.Tohoku Univ. Eng., 2.Univ. of Cambridge Eng., 3.Cavendish Lab., 4.Univ. of Cambridge Che.)

Keywords:spintronics, valley, TMDC

Recently, It has been reported that the valley polarization of excitons and enhancement of photoluminescence (PL) intensity after treated by organic acid (trifluoromethane sulfonimide and oleic acid) in monolayer tungsten disulfide (WS₂) which has direct bandgap. In this research, we treated monolayer WS₂ by organic acid and then we measured excitation dependence of the circularly polarized PL in very low temperature so that we will report stability of valley polarization of excitons and trions.