首页|Unravelling the anisotropic light-matter interaction in strain-engineered trihalide MoCl3

Unravelling the anisotropic light-matter interaction in strain-engineered trihalide MoCl3

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Layered trihalides exhibit distinctive band structures and physical properties due to the sixfold coordinated 3d or 4d transition metal site and partially occupied d orbitals,holding great potential in condensed matter physics and advanced electronic applications.Prior research focused on trihalides with highly symmetric honeycomb-like structures,such as Crl3 and a-RuCl3,while the role of crystal anisotropy in trihalides remains elusive.In particular,the trihalide MoCl3 manifests strong in-plane crystal anisotropy with the largest difference in Mo-Mo interatomic distances.Research on such material is imperative to address the lack of investigations on the effect of anisotropy on the properties of trihalides.Herein,we demonstrated the anisotropy of MoCl3 through polarized Raman spectroscopy and further tuned the phonon frequency via strain engineering.We showed the Raman intensity exhibits twofold symmetry under parallel configuration and fourfold symmetry under perpendicular configuration with changing the polarization angle of incident light.Furthermore,we found that the phonon frequencies of MoCl3 decrease gradually and linearly with applying uniaxial tensile strain along the axis of symmetry in the MoCl3 crystal,while those frequencies increase with uniaxial tensile strain applied perpendicularly.Our results shed light on the manipulation of anisotropic light-matter interactions via strain engineering,and lay a foundation for further exploration of the anisotropy of trihalides and the modulation of their electronic,optical,and magnetic properties.

layered trihalide MoCl3polarized Raman spectroscopystrain engineeringanisotropy

Yuxuan Sun、Ziang Liu、Zeya Li、Feng Qin、Junwei Huang、Caiyu Qiu、Hongtao Yuan

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National Laboratory of Solid State Microstructures,Jiangsu Key Laboratory of Artificial Functional Materials,College of Engineering and Applied Sciences,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210000,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Basic Research Program of the Ministry of Science and Technology of ChinaNatural Science Foundation of Jiangsu Province

923652035207216851861145201523B10102021YFA1202901BK20200341

2024

10.1007/s12274-023-6162-4

纳米研究(英文版)

纳米研究(英文版)

CSTPCD
ISSN：
年,卷(期)：2024.17(4)
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