Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"strong spin-orbit coupling"”.
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Topological Phases in Perovskite Iridates with Strong Spin-Orbit Coupling
… to reveal topological phases in materials with strong spin-orbit coupling. This thesis focuses on possible exotic topological phases that stem from the interplay between strong spin-orbit coupling and non-trivial band structure in three-dimensional perovskite Iridates and other layered Iridate …
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Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling
… was on dynamical aspects such as charge and spin dynamics in order to address several important issues of the spin-related phenomena. The objectives in this project were to: 1) understand charge/spin dynamics in NGS with different confinement potentials, 2) study phenomena such as interband …
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Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
Spinel ferrites (MFe₂O₄, where M = Mn²⁺, Co²⁺, Zn²⁺, etc.) are magnetic nanomaterials with tunable properties that are valuable for wireless communication, memory storage, and electronics. Their complex permeabilities that are governed by composition, particle size, and spin-orbit interactions play …
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Magnetic domain walls driven by interfacial phenomena
… in out-of-plane magnetized multilayer films with strong spin-orbit coupling. In particular, extraordinary current-driven domain-wall motion has been observed in atomically-thin ferromagnets sandwiched between a nonmagnetic heavy metal and an insulator. Through experimental studies on various …
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Electrical gating effects on the magnetic properties of (Ga,Mn)As diluted magnetic semiconductors
… regarded as a prototype material because of its strong spin-orbit coupling and its crystalline properties which can be described within a simple band structure model. Compressively strained (Ga,Mn)As epilayer with more complex in-plane competing cubic and uniaxial magnetic anisotropies is of …
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Exotic superconductivity in quantum materials
… properties of two-component superconductors with strong spin-orbit coupling. Our study is motivated by the experiments on a topological superconductor candidate material, Bi2Se3 doped with Cu, Sn, or Nb atoms. Generally, superconductivity in such systems comes in two flavors: nematic, which breaks …
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SPIN-ORBIT COUPLING IN STRONGLY CORRELATED SYSTEMS
In materials with heavy elements, both strong spin-orbit coupling and Coulomb interactions are possible to exist. Both can significantly change the properties of materials. The coexistence of them can induce more interesting phenomena in solids. In this dissertation, three different cases involved …
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Elementary excitations in heavy-fermion superconductors
… d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which are important effects in heavy-fermions. It is found that p-wave states generally have either a gap on the entire Fermi surface or a gap with point nodes, as in the axial state, while d-wave …
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
… the co-existence of electron correlations and strong spin-orbit coupling on SrTiO3 films on Si(001). Our group has studied the sample having lower carrier concentration (≤ 10¹⁴, cmˉ²) which shows Weak- localization effect. As the carrier concentration increases ( (1 − 2) × 10¹⁴, cmˉ²), we see …
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Ultrafast Spin-Charge Conversion Schemes in Magnets: THz Time Domain Spectroscopy Study
… candidate for the next generation technology is spintronics. The use of the spin degree of freedom as the information carrier can not only complement the existing charge-based functionalities but also opens a wide scope of new solutions. Most importantly, spintronics offers energy-efficient …
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Current-induced torque driven ferromagnetic resonance in magnetic microstructures
… (Ga,Mn)(As,P) have been studied. Due to their strong spin-orbit coupling and well-understood band-structure, these materials are well-suited to this investigation. The combined effect of spinorbit coupling and exchange interaction permits the alternating current to induce an oscillating …
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Beyond the isotropic two-dimensional Heisenberg model: Raman scattering studies of the transition between isotropic and anisotropic spin dynamics in Sr2IrO4
… and the exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun La2CuO4. Understanding the similarity and difference in …
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A complex of interactions in rare-earth based quantum honeycomb magnets
Quantum spin liquids (QSLs) represent an exotic state of matter characterized by long-range quantum entanglement and fractionalized excitations. Although predicted theoretically by models such as the Kitaev honeycomb model, experimentally verifying these states in real materials remains a …
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Electronic properties and device applications of rotationally controlled van der Waals heterostructures
… momentum conservation. Because WSe₂ possesses strong spin-orbit coupling which leads to coupled spin-valley degrees of freedom, controlling the angle between the two WSe₂ monolayers allows us to probe the conservation of spin-valley degree of freedom in tunneling.
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Quantum transport in mesoscopic systems of Bi and other strongly spin-orbit coupled materials
Systems with strong spin-orbit coupling are of particular interest in solid state physics as an avenue for observing and manipulating spin physics using standard electrical techniques. This dissertation focuses on the characteristics of elemental bismuth (Bi), which exhibits some of the strongest …
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Theory of topological insulators and its applications
… orientation, inequivalent surface termination, spin-momentum locking etc. Using a four-band k.p model, some of these features are investigated. Further, peculiarities in the electronic structure of TIs do not allow classical methods of band structure calculation possible. A new approach which …
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Realisation of De Gennes’ Absolute Superconducting Switch and Magnetic Exchange Field Effects at Metallic and Superconductor Interfaces
… and metallic thin-films exhibiting spin-orbit coupling. Firstly, we demonstrate an absolute superconducting switch, confirming a prediction by Pierre-Gilles de Gennes in 1966. This is achieved using a thin-film multilayer of EuS/Au/Nb/EuS, where Au is a metal with strong spin-orbit …
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Exotic phenomena in rare-earth based geometrically frustrated magnets
… materials are of specific interest due to the strong spin-orbit coupling and crystal electric field effects, which split the degenerate 4f angular momentum states, often leading to an effective spin-1/2 doublet with anisotropic effective exchange models. For this reason, RE materials are …
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Exploring linear and nonlinear electromagnetic responses in topological materials
… surfaces, stemming from chiral materials with strong spin-orbit coupling at high symmetry points. This widens the breadth of this thesis, not only in terms of exotic topological materials, but also in terms of electromagnetic-induced responses. In this chapter, we also consider the …
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Tight-binding simulations of random alloy and strong spin-orbit effects in InAs/GaBiAs quantum dot molecules
… quantum dots (QDs), which have long hole-spin coherence times and are amenable to optical control schemes, have long been explored as building blocks for qubit architectures. One such design consists of vertically stacking two QDs to create a quantum dot molecule (QDM). The two dots can be …