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 128 for “"spin-orbit coupling"”.
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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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Geometric frustration in high spin orbit coupling magnetic materials
… of frustrated materials. The ferrimagnetic spinel $\mathrm{CoV_2O_4}$ has been a topic of recent interest, both as a frustrated insulator with unquenched orbital degeneracy and as a near-itinerant magnet which can be driven metallic with moderate applied pressure. Here, we report on our …
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Spin-orbit coupling and supersolidity in ultracold quantum gases
… several experiments on realizing one-dimensional spin-orbit coupling in ultracold 23Na gases and the creation of a new form of matter with supersolid properties using interacting spin-orbit coupled Bose-Einstein condensates. The first part describes the realization of spin-orbit coupling in …
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Topological Phases in Perovskite Iridates with Strong Spin-Orbit Coupling
… 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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Topics in Spin-Orbit Coupling in Cold Atoms and Semiconductors
… contains a collection of topics on the spin-orbit coupling of cold atoms and semiconductors. We first consider the effects of an optically induced spin-orbit interaction on a system of Bosonic atoms. The spin-orbit term couples the emergent pseudo-spin- 1/2 degree of freedom to momentum. …
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Ultracold quantum scattering in the presence of synthetic spin-orbit coupling
… of synthetic gauge fields is the artificial spin-orbit coupling. We discuss three different aspects in scattering theory: ultracold collision, scattering resonance, and bound state formation from a few-body perspective when the atomic spin states are coupled with their center-of-mass motion. …
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Spin-Orbit Coupling in SrTiO3/Si Thin Films at High Carrier Concentration
… 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 WAL …
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SPIN CIRCUIT REPRESENTATION OF ELECTRONIC TRANSPORT IN MATERIALS WITH SPIN ORBIT COUPLING
… involve materials and phenomena featuring both spin and charge transport. SPICE compatible spin circuits with 4-component voltage and current (1 for charge and 3 for spin) have been developed to represent this emerging class of devices. However there has not been much work on circuit …
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Experiments with synthetic spin-orbit coupling and spin transport in Bose Einstein Condensates
… thesis I will describe my experiments to study spin transport of spin Bose Einstein Condensates (BECs) with synthetic spin-orbit coupling. First I will describe procedures used to reproduce previous experiments with synthetic gauge fields in Bose-Einstein Condensates, from constant vector …
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Superconducting phase transitions in hybrid superconducting systems with ferromagnets and spin-orbit coupling
… thesis investigates theoretically the proximity-coupling of superconductivity with ferromagnetism and/or spin-orbit coupling (SOC) in hybrid superconductor systems. The results are summarised in three results chapters which assess the proximity effect in hybrid superconductor systems through …
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EMERGENT PHENOMENA AND NOVEL DEVICES BASED ON SPIN-ORBIT COUPLING AT COMPLEX OXIDE INTERFACES
… novel quantum materials and properties. Spin-orbit coupling (SOC) has been pivotal to this effort as it offers an effective means to drive and manipulate magnetic properties – such as anisotropy, spin relaxation, magnetic damping, anisotropic magnetoresistance, and anomalous Hall effect – …
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Enhancing the efficiency of organic LEDs through spin-orbit coupling of charge-transfer states
… molecule organic light-emitting diodes through spin-orbit effects is examined. Because only singlet spin states, statistically one quarter of the total possible states, emit fluorescent light, it has generally been thought that a maximum of 25% efficiency could be attained without the addition …
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Experimental methods to examine the role of vibrational excitation in the singlet-triplet spin-orbit coupling in acetylene
… Acetylene has been observed to have a complex spin-orbit coupling mechanism where the first excited singlet state S couples to the triplet state T3 which is then coupled to the dense manifold of vibrational states in the T, 2 electronic states. A description of theories imperative to this study …
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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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Interdimensional effects in systems of fermions
… which are favourable candidates in the field of spintronics. These materials include topological insulators, graphene, and heterostructure materials with large Rashba spin-orbit coupling along an interface. In all of these materials, the electron's spin is responsible for exotic behaviour along …
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Simulating and controlling non-adiabatic effects in ultrafast photochemistry
… experimental observations. We develop a Vibronic Coupling Hamiltonian previously published [G.A.Worth, J . Photochem. Photobio. 190:190-199,2007]. Using CASPT2 we add dynamic correlation to the description of the excited states, improving their accuracy dramatically. Seven coupled states and all …
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Orbital Polarization in Relativistic Density Functional Theory
… in an atom described by quantum numbers, spin (S), orbital (L), and total angular momentum (J) of its electrons. A set of guidelines, known as Hund's rules, discovered by Friedrich Hermann Hunds help us to determine the quantum numbers for the ground states of free atoms. The question ``to …
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CHARGE AND SPIN TRANSPORT STUDIES IN GRAPHENE AND BLACK PHOSPHORUS
… in this thesis. Specifically, I studied the spin transport and spin characteristics of graphene subjected to an enhancement of its otherwise low intrinsic spin-orbit coupling. Taking advantage of its flexibility for engineering modification, we enhanced the spin-orbit coupling via chemical …
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Measurements of magnetoresistance in amorphous alloys
… data reveal that the influence of spin-orbit coupling on the conductivity increases with the atomic number of components. The data are discussed in terms of the theories of magnetoresistance of interacting and noninteracting three-dimensional electron gases in the presence of a …
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