Phonon Dynamics of Topological Quantum Materials

TL;DR

This paper investigates phonon dynamics in topological quantum materials using Raman spectroscopy and density functional theory, revealing fractionalized excitations, structural transitions, and quantum states relevant for quantum technology applications.

Contribution

It provides new insights into phonon behavior and quantum states in topological materials, highlighting potential for quantum computing and communication.

Findings

Detection of Majorana fermions in V_(1-x)PS_(3)

Observation of topological surface phonons in PbTaSe_(2)

Identification of Mott-insulating and quantum spin liquid states in 1T-TaS_(2)

Abstract

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.