Advisor(s)

Yogesh Vohra
Wenli Bi

Committee Member(s)

Cheng-Chien Chen
Gayan Wijeratne
Gilberto Fabbris

Document Type

Dissertation

Date of Award

6-1-2026

Degree Name

Doctor of Philosophy (PhD)

School

College of Arts and Sciences

Department

Physics

Abstract

Quantum technology leverages the principles of quantum mechanics to transform emerging fields such as quantum computing, spintronics, and next-generation electronics. A crucial step in advancing this frontier is the detailed understanding of fundamental quantum phenomena in materials that can drive quantum innovation. This research aims to systematically investigate quantum phase transitions and unconventional emergent behaviors in magnetic topological materials subjected to external pressure. This study focuses on three representative systems: EuCd2As2, EuMnBi2, and FeSn, each serving as a model for exploring intrinsic magnetic topological states. EuCd2As2, a candidate Weyl semimetal (WSM), is expected to exhibit pressure-induced topological phase transitions, making it ideal for studying the interplay between magnetism and electronic band topology. EuMnBi2, a layered magnetic Dirac semimetal candidate (DSM), provides a unique platform to investigate the coupling between Dirac fermions and magnetic order, with pressure acting as a clean tuning parameter for controlling its transport and electronic behavior. FeSn, a kagome magnet, hosts Dirac nodes and flat bands in its band structure and offers an exceptional opportunity to examine how strain-induced lattice distortions affect topological and magnetic properties. To achieve these objectives, the project utilizes state-of-the-art high-pressure synchrotron-based techniques, including synchrotron Mössbauer spectroscopy (SMS), X-ray absorption spectroscopy (XAS), and X-ray diffraction (XRD). These tools enable direct probing of pressure-induced changes in crystal symmetry, magnetic ordering, and electronic structure. Through precise pressure manipulation, we aim to uncover novel quantum phases and band structure evolutions in WSM, DSM, and kagome systems. The anticipated outcomes of this research include deeper insight into the fundamental mechanisms governing magnetic topological materials and the realization of tunable topological states. These findings will inform the design of future quantum materials and pave the way for technological advances in dissipationless electronics, spintronic devices, and quantum computing platforms.

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