[14p-K301-1~18] 17.3 Layered materials

5:45 PM - 6:00 PM JST(8:45 AM - 9:00 AM UTC)

[14p-K301-17] Optically induced spin current in Janus transition-metal dichalcogenides

〇(DC)Tomoaki Kameda¹, Katsunori Wakabayashi¹ (1.Kwangaku Univ.)

Keywords:

Janus transition-metal dichalcogenides,optical response,spin current

Janus transition-metal dichalcogenides (Janus TMDC) are two-dimensional materials with unique structural asymmetry, where one layer of chalcogen atoms in a TMDC is replaced by another one. This replacement breaks out-of-plane mirror symmetry, which induces the Rashba-type spin-orbit coupling (SOC). Unlike conventional devices requiring an external electric field to induce Rashba SOC, Janus TMDC exhibits it spontaneously, offering a more stable and energy-efficient platform for spintronics. The Rashba SOC in Janus TMDC leads to spin-momentum locking, where the spin orientation is tied to electron momentum. External stimuli, such as light or an electric field, can create a non-equilibrium electron distribution, generating spin currents. This property enables efficient spin current generation without the need for additional external fields.In this study, we theoretically investigate spin current generation in Janus TMDC under optical excitation. Using a tight-binding model and the Kubo formula, we demonstrate that the efficiency of spin current generation depends on the strength of Rashba SOC, highlighting the potential of Janus TMDC in advanced spintronic applications.