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 9 of 9 for “"Low disorder"”.
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Epitaxial aluminium gates in ultra-shallow GaAs/AlxGa1-xAs heterostructures for low disorder nanoelectronics
… decreasing the depth of the conduction channel below the wafer surface, but increased scattering from charge trapped in oxides at the semiconductor surface hinders device performance. In this thesis we report the suppression of surface charge in GaAs/Alx Ga1 xAs systems with ultra-shallow …
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Growth of low disorder GaAs/AlGaAs heterostructures by molecular beam epitaxy for the study of correlated electron phases in two dimensions
… material purity issues currently limiting the low temperature electron mobility. Finally, a series of appendices are included which detail the experimental methods used over the course of the research.^ Chapter 4 presents an experiment examining transport in a low density two-dimensional hole …
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Perovskite Light-emitting Diodes with Tunable Emission
… Halide perovskite has tunable colour emission, low disorder and is solution processable making it one of a popular choice as emitters. This thesis demonstrates the versatility of using halide perovskite material in light-emitting diodes. We demonstrate the first working perovskite light-emitting …
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Properties of dirty bosons in disordered optical lattices
The study of the disordered Bose-Hubbard model is key to understanding the interplay of disorder and interactions. Despite many studies with uniform diagonal disorder, few have inquired into experimental realizations with an additional correlated off-diagonal disorder. The presence of a trap and …
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The Electrical Transport Study Of Graphene Nanoribbons And 2d Materials Beyond Graphene
… transport measurements on a suspended ultra-low-disorder graphene nanoribbon (GNR) with nearly atomically smooth edges that reveal a high mobility exceeding 3000 cm2 V-1 s-1 and an intrinsic bandgap was reported in this study. The experimentally derived bandgap is in quantitative agreement …
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Charge and Thermoelectric Transport in Semicrystalline Conjugated Polymers and Single-Walled Carbon Nanotube Networks
… high-mobility copolymers is incompatible with disorder-based transport models that were developed for preceding, more disordered polymers. Instead the charge density and temperature dependence of the field-effect mobility and gated Seebeck coefficient of the semicrystalline n-type polymer …
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Charge Transport in Field-Effect and Ion-Gel Gated Conjugated Polymers
… diverse, customised conjugated polymers with a low degree of disorder, 15 derivatives of the benchmark low disorder polymer semiconductor IDT-BT were synthesised. To create the derivatives, a number of modifications were made to the acceptor unit, donor unit, molecular weight or side chains. The …
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Enhancing Fluorescence and Charge Transport in Disordered Organic Semiconductors
… apparent trade-off between $\mu$ and $\Phi$ in disordered systems. Recent reports of state-of-the-art device performance often optimise $\mu$ and $\Phi$ in disordered organic materials separately, and employ multi-layer architectures. In this work, we investigate materials in a class of …
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Numerical studies on many-body localization
… interacting, quantum systems subject to strong disorder, has been the focus of a large body of theoretical, numerical, and experimental work in recent years. In this thesis we numerically study several aspects of MBL and the ergodic-MBL transition. Chapter 1 introduces the concept of …