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

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nano Letters Pub Date : 2025-03-28 DOI:10.1021/acs.nanolett.5c00074

Mengyu Liu, Wei Wu, Zilong Chen, Yuxiang Zhang, Xingcheng Yu, Shunhang Yang, Hao Wang, Feiya Xu, Li Chen, Xu Li, Yaping Wu, Zhiming Wu, Junyong Kang

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Abstract

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/MoSe₂ 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.

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Janus MoSeS/MoSe2异质结构中极化场诱导的非等效激子动力学

激子与物理场之间的相互作用是凝聚态物理领域的前沿研究课题，对揭示材料特性具有重要影响。在此，我们研究了具有2H-或3r堆叠构型的Janus MoSeS/MoSe2异质结构中的谷激子行为。我们确定了Janus材料的本征极化电场能显著增强其谷极化。此外，实验结果表明，在本征电场作用下，不同激子表现出不等价的自旋谷动态过程。其中，由于量子受限的Stark效应，谷间trions在强本征电场下表现出优越的自旋态保持能力，从而实现了最高程度的谷极化。这项工作为激子和极化电场之间的强相关效应提供了基本的见解，标志着对谷自由度控制的进步。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.