Kumar, Rohit (2023) Second Harmonic Generation on 2D ferroelectrics. [Tesi di dottorato]

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Recent years have seen growing interest in the study of two-dimensional (2D) ferroelectrics due to their potential applications in electronic devices. The stable layered structures and reduced surface energy of 2D materials offer a path to explore low-dimensional ferroelectricity and make ultra-high-density devices possible. In complementary metal-oxide-semiconductor (CMOS) technology, 2D ferroelectrics can be used as capacitors, transistors, and memory devices, among others. In our work, Second harmonic generation (SHG), a non-linear optical process, was used to study the 2D ferroelectrics. SHG has been widely used as a tool to study the ferroelectric materials such as their polarization and domain structure. SHG can be used for the detection of ferroelectric domains and for characterizing ferroelectric devices, providing crucial information for the development and optimization of 2D ferroelectric-based electronics. The study of 2D ferroelectrics through SHG has two main objectives: first, to investigate their intrinsic nonlinear optical properties and second to utilize nonlinear optical techniques to examine the symmetry, structure, and electronic properties of 2D ferroelectrics, particularly near phase transitions. The use of SHG provides a powerful tool for exploring these properties. SHG is also used to study the phase transition of 2D chalcogenides such as pure and doped Germanium Telluride (GeTe). In conclusion, 2D ferroelectrics and their use in CMOS technology, as well as the application of SHG, are significant research topics in the field of electronics and materials science. These materials and techniques have the potential to revolutionize electronics and lead to the development of novel, low-power, high-performance devices.

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