This dissertation focuses on the study of the superionic state in multicomponent systems, where the smaller component exhibits delocalization and mobility while still maintaining system compactness through component attractions. Superionic behavior is widely observed in various systems and plays a crucial role in ceramic superionic conductors, which offer high ion...
In recent years, the understanding and identification of quantum materials supporting non-trivial band topology has progressed rapidly. This progress has been motivated in part by the potential application of topological quantum materials in quantum computers, sensors, and other next-generation devices. Despite this progress, the computation of bulk topological invariants in...
Necessity is the mother of innovation. In the wake of the pandemic, with no flow of samples and limited fabrication techniques available, necessity demanded a new material platform and adaptable methods to make complex oxide samples worth measuring. The material platform was KTaO3 , the younger successor to the mainstay...
Light is a powerful tool for manipulating and probing magnetic states in solid state systems. In particular, optically-induced spin orientation, the ability to orient spin with polarized light, has been extensively utilized in low-dimensional III-V and II-VI semiconductors to pioneer spintronic research. Even though traditional semiconductors have found a wide...
The field of materials discovery is undergoing an unprecedented transition from laboratory tocomputer. Behind this transition is the new ability to accurately compute material properties, especially
energetic stability, from first principles with density functional theory (DFT). However,
DFT remains computationally expensive, and DFT-based materials discovery is intractable, especially
in high...
Emergent phenomena are phenomena that only arise from the bulk collective, not from individual pieces of that collective. The design of materials which host emergent phenomena can be achieved by controlling the interactions between constituent atoms, ions, or electronic spins in a material, and include materials such as permanent magnets...
Fluctuations are ubiquitous in physics.For a system close to a phase transition, the order parameter fluctuations are strong.
In this thesis we study the pair fluctuations in liquid 3He when it is close to the superfluid phase transition.
Liquid 3He is a neutral Fermi liquid, which allows zero sound to...
Part I - Experimental Studies of Spin Waves in a Micrometer-Thick Yttrium Iron Garnet filmAn investigation of spin wave dispersion in a micrometer-thick ferrimagnetic yttrium iron garnet (YIG) film has been conducted in various regimes. In the linear excitation regime, the dispersion of spin waves was characterized in an yttrium...
The cuprate superconductor HgBa$_2$CuO$_{4+\delta}$ (Hg1201) has one of the simplest physical structures of the cuprates making it an ideal candidate for nuclear magnetic resonance (NMR) measurements. Here we discuss our NMR experiments aimed at studying the mixed state of two under-doped single crystal Hg1201 samples at high magnetic fields.
Light provides a high-speed and coherent medium for controlling quantum states. In semiconductors, coherent optical effects have been used extensively to lift spin degeneracy on ultrafast timescales and demonstrate high-fidelity control of quantum spin states. Extending this approach to novel pseudospins in monolayer transition metal dichalcogenides (TMDs), in this thesis...