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Unravelling the anisotropic light-matter interaction in strainengineered trihalide MoCl_(3)

Nano Research 2024年第4期17卷 2981-2987页

作者： Yuxuan Sun Ziang Liu Zeya Li Feng Qin Junwei Huang Caiyu Qiu Hongtao Yuan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210000China

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 *** research focused on trihalides with highly symmetric honeycomb-like structures,such as CrI3 andα-RuCl_(3),while the role of crystal anisotropy in trihalides remains *** particular,the trihalide MoCl_(3) manifests strong in-plane crystal anisotropy with the largest difference in Mo–Mo interatomic *** on such material is imperative to address the lack of investigations on the effect of anisotropy on the properties of ***,we demonstrated the anisotropy of MoCl_(3) through polarized raman spectroscopy and further tuned the phonon frequency via strain *** showed the raman intensity exhibits twofold symmetry under parallel configuration and fourfold symmetry under perpendicular configuration with changing the polarization angle of incident ***,we found that the phonon frequencies of MoCl_(3) decrease gradually and linearly with applying uniaxial tensile strain along the axis of symmetry in the MoCl_(3) crystal,while those frequencies increase with uniaxial tensile strain applied *** 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.

关键词： layered trihalide MoCl_(3) polarized raman spectroscopy strain engineering anisotropy

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Visualization of Ferroelectric Domains in Thin Films of Molecular Materials Using Confocal Micro-raman spectroscopy

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Chemical Research in Chinese Universities 2022年第6期38卷 1394-1399页

作者： ZHOU Wenqin FENG Zijie XIONG Yuan DU Guowei LIN Xiumei SU Qidong LOU Yuheng AN Shili YOU Yumeng Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics Southeast UniversityNanjing211189P.R.China School of Chemistry and Chemical Engineering Southeast UniversityNanjing211189P.R.China

Ferroelectrics are an important class of functional *** all their unique properties,the study of their ferroelectric domains and domain walls is of great interest due to their importance in ferroelectric *** are many methods to characterize ferroelectric domains,namely,scanning probe microscopy,optical microscopy,electron microscopy,***,newly emerged molecular ferroelectrics are attracting much attention from chemists,physicists and researchers in material sciences due to their structural flexibility,light mass,simple fabrication,***,for the characterization of molecular ferroelectric domains,most conventional methods require either a complicated preparation process or direct contact between physical probes and material surfaces,limiting the development of molecular ferroelectric *** this report,we have demonstrated that confocal micro-raman spectroscopy,as a nondestructive and noncontact in-situ method,is very suitable for studying the ferroelectric polarization and structures of domains in molecular *** recently reported molecular ferroelectric trimethylchloromethyl ammonium trichlorocadmium(II)(TMCM-CdCl_(3))as an example,the non-180°domains have been characterized and visualized at different *** a simple and extendable method requires minimum sample preparation,which would further benefit the research of molecular ferroelectric domain engineering and promote the miniaturization and integration of molecular ferroelectric films.

关键词： Molecular ferroelectric Ferroelectric film Domain polarized raman spectroscopy raman imaging

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