Wavelength-dependent anisotropic light-matter interaction in 2D ferroelectric In2Se3

Divya Jangra; Binoy Krishna De; Pragati Sharma; Koushik Chakraborty; Shubham Parate; Arvind Kumar Yogi; Ranjan Mittal; Mayanak K Gupta; Pavan Nukala; Praveen Kumar Velpula; Vasant G. Sathe

arXiv · 2409.17570

Wavelength-dependent anisotropic light-matter interaction in 2D ferroelectric In2Se3

Divya Jangra·Binoy Krishna De·Pragati Sharma·Koushik Chakraborty·Shubham Parate·Arvind Kumar Yogi·Ranjan Mittal·Mayanak K Gupta·Pavan Nukala·Praveen Kumar Velpula·Vasant G. Sathe

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Abstract

The anisotropic light-matter interactions in 2D materials have garnered significant attention for their potential to develop futuristic polarization-based optoelectronic devices, such as photodetectors and photo-actuators. In this study, we investigate the polarization-dependent interactions in ferroelectric 3R alpha-In2Se3 using Angle-Resolved Polarized Raman Spectroscopy (ARPRS) with different excitation lasers. Our experimental findings supported by complementary Density Functional Theory calculations demonstrate that the light-matter interactions depend not only on the crystallographic orientation but also on the excitation energy. Scanning transmission electron microscopy (STEM) confirms the highly anisotropic 3R crystal structure of alpha-In2Se3. This anisotropy in crystal structure facilitates significant optical anisotropy, driven by a complex interplay of electron-photon and electron-phonon interactions, which is reflected in the complex nature of the Raman tensor elements. These anisotropy interactions extend to the materials electrical response under light illumination. Remarkably, the anisotropic photo-response can be tuned by both polarization and wavelength of the incident light, making In2Se3 a promising material for advanced polarization-sensitive photodetection applications.

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Divya Jangra, Binoy Krishna De, Pragati Sharma, Koushik Chakraborty, Shubham Parate, Arvind Kumar Yogi, Ranjan Mittal, Mayanak K Gupta, Pavan Nukala, Praveen Kumar Velpula, Vasant G. Sathe. 2024-09-26. Wavelength-dependent anisotropic light-matter interaction in 2D ferroelectric In2Se3. https://arxiv.org/abs/2409.17570

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