Polarization-Field-Induced Inequivalent Exciton Dynamics in Janus MoSeS/MoSe2 Heterostructures

作者：Mengyu Liu, Wei Wu, Zilong Chen, Yuxiang Zhang, Xiang Yu, Shunhang Yang, Hao Wang, Feiya Xu, Li Chen, Xu Li, Yaping Wu, Zhiming Wu, Junyong Kang · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c00074 · 被引用次数：3 · 研究领域：2D Materials and Applications、Perovskite Materials and Applications、Quantum Dots Synthesis And Properties

The interplay between excitons and physical fields emerges as a forefront research topic within the domain of condensed matter physics, harboring significant impact for unraveling material properties. Herein, we investigate the valley exciton behaviors in Janus MoSeS/MoSe 2 heterostructures with 2H- or 3R-stacking configurations. We ascertain that the intrinsic polarized electric field in Janus materials can markedly enhance the valley polarization. Furthermore, experimental results reveal that different excitons exhibit inequivalent spin-valley dynamic processes under intrinsic electric fields. Among them, intervalley trions exhibit a superior capability to preserve their spin states under a strong intrinsic electric field due to the quantum-confined Stark effect, thereby achieving the highest degree of valley polarization. This work provides fundamental insights into the strong correlation effect between excitons and polarized electric fields, signifying an advancement in control over the valley degree of freedom.