Stacking Faults Enabled Second Harmonic Generation in Centrosymmetric van der Waals RhI<sub>3</sub>

Liu, Yue; He, Wen; Wu, Bingze; Xuan, Fengyuan; Fang, Yuqiang; Zhong, Zhengbo; Fu, Jierui; Wang, Jia-Peng; Li, Zhipeng; Wang, Jinzhong; Yao, Mingguang; Huang, Fuqiang; Zhen, Liang; Li, Yang; Xu, Cheng-Yan

doi:10.1021/acsnano.4c03562

ACS Nano

2024

DOI: 10.1021/acsnano.4c03562

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Stacking Faults Enabled Second Harmonic Generation in Centrosymmetric van der Waals RhI₃

Yue Liu,

Wen He,

Bingze Wu

et al.

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Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

Gao,

Wang,

Ren

et al. 2024

Preprint

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Electric polarization typically originates from non-centrosymmetric charge distributions. Since chemical bonds between atoms of the same elements favor centrosymmetric crystal structures and symmetrically distributed electron charges, elemental ferroelectrics are extremely rare. In comparison to atoms, elemental clusters are less symmetric and typically have various preferred orientations in crystals. Consequently, the assembly of clusters with different orientations tends to break the inversion symmetry. Based on this concept, we show that sliding ferroelectricity naturally emerges in trilayer quasi-hexagonal phase (qHP) C60, a cluster-assembled carbon allotrope recently synthesized. Trilayer qHP C60’s have several ferroelectric structures, which are distinguishable in second-harmonic generation (SHG) responses. Compared to previously found elemental ferroelectrics, trilayer qHP C60’s have sizable band gaps and some of them have both switchable out-of-plane and in-plane polarizations. The out-of-plane and in-plane polarizations of these trilayer systems can be switched independently and enable an easy-to-implement construction of Van der Waals homostructures with ferroelectrically switchable chirality.

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Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

Gao,

Wang,

Ren

et al. 2024

Preprint

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Stacking Faults Enabled Second Harmonic Generation in Centrosymmetric van der Waals RhI₃

Cited by 1 publication

References 54 publications

Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

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Stacking Faults Enabled Second Harmonic Generation in Centrosymmetric van der Waals RhI3

Cited by 1 publication

References 54 publications

Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

Cluster Sliding Ferroelectricity in Trilayer Quasi-Hexagonal C60

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Stacking Faults Enabled Second Harmonic Generation in Centrosymmetric van der Waals RhI₃