The thesis presents a comprehensive Raman spectroscopic and first-principle density functional theory based investigation of V_ (1-x) PS_ (3) ; PbTaSe_ (2) and 1T-TaS_ (2). In V_ (1-x) PS_ (3), the detection of fractionalized excitations (Majorana fermions) suggests a potential Kitaev spin liquid phase, which becomes more pronounced as dimensionality decreases. Evidence of temperature-driven structural phase transition and topological surface phonons has been detected in PbTaSe_ (2). TaS_ (2) in 1T-phase reveals the presence of a hidden quantum state, a Mott-insulating phase, and a quantum spin liquid state. The observed phenomenon in these quantum systems makes them a promising candidate for advanced technologies such as quantum computing and communication.
Vivek Kumar (Wed,) studied this question.