Presentation Information
[8p-N206-14]Optical Control of Valley-Selective Dynamics in Tin Sulfide Monolayer
〇(PC)Arqum Hashmi1, M. Umar Farooq2, Mizuki Tani3, Kazuhiro Yabana4, Tomohito Otobe3, Kenichi L. Ishikawa1 (1.UTokyo, 2.SUSTech, 3.KPSI, QST, 4.Univ. of Tsukuba)
Keywords:
2D material,TDDFT,Valleytronics
Valley-dependent physics has been extensively studied in monolayer transition metal dichalcogenides (TMDs) with honeycomb lattices, where valleytronics typically involves a single valley pair related by time-reversal symmetry. Recent advances suggest that group-IV monochalcogenides offer a promising alternative. We present a theoretical study of valleytronic phenomena in two-dimensional (2D) tin sulfide (SnS) using time-dependent density functional theory coupled with Maxwell’s equations. Our results demonstrate that 2D SnS offers the possibility of exploiting multiple valley states, thereby significantly enhancing the degrees of freedom for optical valley manipulation. We also explore how carrier-envelope phase manipulation using femtosecond laser pulses enables selective excitation of multiple valley states within a sub-cycle timescale, offering a new paradigm for high-speed valley-based technologies.