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 13 of 13 for “"spin lifetime"”.
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Effects of asymmetry on electron spin dynamics in gallium arsenide quantum wells
This work presents optical studies of electron spin dynamics in gallium arsenide (GaAs) quantum wells, focusing on the effect of inversion asymmetric confinement potentials on spin lifetimes in quantum wells grown on (110)-oriented substrates. Inversion asymmetry in the presence of the spin orbit …
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Spin and Charge Dynamics in Organic Semiconductors
… details the efforts made to investigate lateral spin transport (LST) in metal phthalocyanines with the underlying theory explained in chapter 3. We present the full process of obtaining and characterising spintronics appropriate metal phthalocyanines and present the first ever room-temperature …
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Spin Transport in Organic Semiconductors
… potential for use in solid state devices for spintronics and spin-based information processing. Organic semiconductors composed of mainly light elements appeal to the field of spintronics due to their long spin lifetime originating from their weak spin-orbit coupling. The significant progress …
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Optical and Spin Properties of Defect-Bound Excitons in Semiconductors
… bound exciton, finding three distinct radiative lifetimes. Next, we utilize our knowledge of bound-exciton transitions to measure the spin lifetime of donor-bound electrons. These measurements motivate the use of shallow-dopant-bound spins as qubits for quantum information, and we explore …
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VISUALIZATION OF CURRENT INDUCED SPIN ACCUMULATIONS IN THE STRONG SPIN-ORBITAL COUPLING MATERIALS
Charge-to-spin conversion in various material systems is the key to understanding a variety of spin-orbitronics phenomena. In this thesis, we first image the current induced spin accumulation at the channel edges of Bi2Se3 and BiSbTeSe2 topological insulators as well as Pt heavy metal by scanning …
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SPIN AND CHARGE TRANSPORT IN 2D MATERIALS AND VAN DER WAALS HETEROSTRUCTURES
… field as well as BKT transition. Secondly, spin-polarized tunnel spectroscopy of NbSe2 is presented. The tunnel spectra strongly depend on the magnetization configuration of the tunnel contacts. The result is drastically different from a similar experiment on aluminium, suggesting the …
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Control of chiral optical and spin properties in low-dimensional perovskites
… symmetry breaking, giving rise to spin-selective and circularly polarized optical phenomena. The introduction of chiral organic cations breaks inversion and mirror symmetries and induces unique structural behavior in the absence of external magnetic fields, e.g., circularly …
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Chip-scale atomic magnetometer based on free-induction-decay
… us to monitor the free Larmor precession of the spin coherent Cs atoms by separating the pump and probe phases in the time domain. A single light pulse can sufficiently polarise the atomic sample;however, synchronous modulation of the light field actively drives the precession and maximises the …
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Dynamic and geometric control of electronic spins in diamond for quantum sensing and quantum information science
… (NV) color center in diamond, electronic spin defects embedded in a solid-state system, has emerged as a promising platform for quantum sensing and quantum information science in ambient temperature. Its capability of robust but high-precision spin control allows the NV center to be not …
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Spin-coherence and -dephasing of donor and free conduction band electrons across the metal-insulator transition in Si:GaAs
… as a magnetization state. The emerging field of Spintronics is trying to combine the world of semiconductor electronics and magnetism to overcome disadvantagesof each part on its own. Furthermore, new phenomena and applications associated with them may arise. Although this dissertation deals only …
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Techniques to Characterize Vapor Cell Performance for a Nuclear-Magnetic-Resonance Gyroscope
… measure for gyro performance is the longitudinal spin lifetime of polarized xenon atoms in the vapor cell. The newly implemented technique for measuring these lifetimes matches results from the industry standard method to within 3.5% error while reducing the average testing time by 76% and …
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Developing the spin qubit of the tin-vacancy center in diamond for quantum networks
… requires developing a system with excellent spin and photonic properties [8]. To date, no system has demonstrated excellence in both of these regards simultaneously. At a high level, this thesis develops the spin properties of the tin-vacancy (SnV) center in diamond, a system for which the …
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Spin dynamics of bulk and quasi-two-dimensional metal halide based perovskite semiconductors
… metal halide perovskites. Specifically, of their spin dependencies on lattice and many-body interactions. Many of these results were obtained in close collaboration with others, as specified throughout the dissertation. First, we report that spin-dependent exciton interactions modify the exciton …