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Naturally occurring van der Waals heterostructure lengenbachite with strong in-plane structural and optical anisotropy

Authors :
Arindam Dasgupta
Xiaodong Yang
Jie Gao
Source :
npj 2D Materials and Applications, Vol 5, Iss 1, Pp 1-13 (2021)
Publication Year :
2021
Publisher :
Nature Portfolio, 2021.

Abstract

Abstract Lengenbachite is a naturally occurring layered mineral formed with alternating stacks of two constituent PbS-like and M2S3-like two-dimensional (2D) material layers due to the phase segregation process during the formation. Here, we demonstrate to achieve van der Waals (vdW) heterostructures of lengenbachite down to a few layer-pair thickness by mechanical exfoliation of bulk lengenbachite mineral. The incommensurability between the constituent isotropic 2D material layers makes the formed vdW heterostructure exhibit strong in-plane structural anisotropy, which leads to highly anisotropic optical responses in lengenbachite thin flakes, including anisotropic Raman scattering, linear dichroism, and anisotropic third-harmonic generation. Moreover, we exploit the nonlinear optical anisotropy for polarization-dependent intensity modulation of the converted third-harmonic optical vortices. Our study establishes lengenbachite as a new natural vdW heterostructure-based 2D material with unique optical properties for realizing anisotropic optical devices for photonic integrated circuits and optical information processing.

Details

Language :
English
ISSN :
23977132
Volume :
5
Issue :
1
Database :
Directory of Open Access Journals
Journal :
npj 2D Materials and Applications
Publication Type :
Academic Journal
Accession number :
edsdoj.94261bd91f00458b9e3cd5bcc926814d
Document Type :
article
Full Text :
https://doi.org/10.1038/s41699-021-00271-8