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 12 of 12 for “"Rashba effect"”.
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Spin-Bahn-Wechselwirkung in niedrigdimensionalen Al x Ga 1-x N/GaN-Elektronengasen
… this way, one can control the spin-splitting, an effect also known as Rashba-effect. In contrast to conventional III/V-semiconductors, the spin-orbit coupling arising from the crystal and the one from the macroscopic electric field of the heterostructure are of the same kind, so that they both can …
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Rashba-Effekt in niedrigdimensionalen InGaAs/InP Strukturen
… InGaAs/InP heterostructures, referred to as Rashba Effect, is investigated. It focuses on the basic features of the spin-orbit interaction in quasi one-dimensional structures (quantum wires) with typical widths of 150 to 1000 nm. These quantum wires were prepared by metal-organic vapor phase …
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SPIN-ORBIT COUPLING IN STRONGLY CORRELATED SYSTEMS
… it is shown that a possible nonlinear Rashba effect can emerge in such a system. It can explain the presence of giant Rashba constants in some two-dimensional devices.
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Charge Carrier Relaxation in Halide Perovskite Semiconductors for Optoelectronic Applications
… still debated and an indirect bandgap due to a Rashba splitting has been suggested. In this thesis, we study the early-time carrier relaxation and its impact on photoluminescence emission. We first study ultrafast carrier thermalization processes using 2D electronic spectroscopy and extract …
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High Pressure Quantum Oscillation Study of BiTeI and Bi2Te3
… in this thesis investigates the behaviour of the Rashba semi-conductor BiTeI and of the topological insulator $\text{Bi}_2\text{Te}_3\,$ under pressure. Using Shubnikov-de Haas quantum oscillation measurements, the evolution of the Fermi surface of both materials was tracked as a function of …
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Unidirectional Magnetoresistive Behaviors: Materials, Characterization, and Prospects
… may be attributed to an interplay of enhanced Rashba effect by spin canting and the contributions of magnons. Moreover, BMER is observed in a single layer topological semimetal Pt3Sn for the first time and is found to be enhanced by ~2 times with an adjacent ferromagnetic layer. This finding …
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First Principle Modeling of Hybrid Halide Perovskites for Optoelectronic Applications
… strong electron-phonon coupling. Relativistic effects are studied using spin orbit coupling (SOC) corrections to account for large atoms like Pb and I. The Rashba effect is seen when SOC corrections are added which implies inversion symmetry breaking and momentum dependent photoexcitation, both …
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A photoemission study of quasiparticle excitations, electron-correlation effects and magnetization dynamics in thin magnetic systems
… thesis, the strength of electron correlation effects in the spin-dependent electronic structure of ferromagnetic bcc Fe(110) and hcp Co(0001) is investigated by means of spin- and angle-resolved photoemission spectroscopy. The experimental results are compared to theoretical calculations …
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Phase coherent transport phenomena in HgTe quantum well structures
… a very good template to study spin related effects. It exhibits large Zeeman spin splitting and Rashba spin-orbit splitting. The latter is at least four to five times larger than in III-V semiconductors. Initially a short review on the transport theory was presented. The main focus as on …
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EMERGENT PHENOMENA AND NOVEL DEVICES BASED ON SPIN-ORBIT COUPLING AT COMPLEX OXIDE INTERFACES
… 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 – allowing it to be exploited for future spin-orbitronics, especially for …
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Angle-resolved photoemission and first-principles studies of topological thin films
… films become ultrathin, the quantum tunneling effect breaks the degeneracy at the Dirac point of the topological surface bands, resulting in a gap. Our ARPES mapping of the surface band structure of a 4-BL Sb film reveals no energy gap at the Dirac point. This lack of tunneling gap can be …
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Equilibration of deep neural networks and carrier chirality in Rashba systems
… the decay of non-equilibrium states in strongly Rashba-coupled systems at low temperature. Deep learning is a conceptually simple, highly effective, and widely used tool, yet there remains insufficient understanding for why it works. The optimisation of deep neural networks with common algorithms …