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 115 for “"transport measurements"”.
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Transport measurements on NdCeCuO thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1992.
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Noise detection and transport measurements of spin valve systems.
Electronic noise not only limits the performance of magnetic devices in practical applications but also provides valuable physical insights into these devices. The first part of this thesis discusses how the low frequency noise in magnetic tunnel junctions and giant magnetoresistance devices can be …
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Correlation of laboratory and installed drainage system solid transport measurements
The transport of solids in 'horizontal' above ground drainage pipes was the subject of an investigation, based upon the measurement of both sterile 'model' solid velocity and 'live' waste load velocity, aimed at the establishment of a sound basis for the development of a comprehensive empirical …
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Minority Electron Base Transport in Heterojunction Bipolar Transistors Determined by Magneto-Transport Measurements
The magneto-transport method is a technique that allows the simultaneous measurement of the minority electron mobility in the base of the HBT and the dc current gain of the device. The minority electron lifetime can be determined using these two measurements. Therefore, this technique is very …
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Turbulence and transport measurements in Alcator C-Mod and comparisons with Gyrokinetic simulations
… plasmas is the primary means by which energy is transported from the core of the plasma to the edge, where it is lost, and is therefore the main limitation of tokamak plasma performance. Dilution of the main-ion species was found to have a stabilizing effect on ion gyroradius scale turbulence in …
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Single-layer transport measurements of bilayer 2D electron and hole systems in GaAs heterostructures
… studies, which involve low temperature magneto-transport measurements of one 2D system independent of the other, and one theoretical study. Firstly, we present a new technique for measuring the chemical potential of a 2D system. In a bilayer 2D electron system (2DES), we use the lower 2DES as a …
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Microwave Spectroscopy and Transport Measurements of Andreev Bound States in Superconductor – Semiconductor Josephson Junctions
… states are the microscopic states which mediate transport through these junctions. In this thesis a series of experiments aimed at understanding Andreev bound states in Josephson junction devices are presented. RF reflectometry measurements of a superconducting tunnel junction are made sensitive …
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Magnetotransport of connected artificial spin ice
… of magnetic pyrochlore oxides. Here I detail measurements of the magnetotransport response of connected artificial spin ice to varying temperatures and magnetic fields. In the literature, transport measurements have been used simply as a tool to probe the behavior of connected artificial spin …
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Transport spectroscopy of graphene quantum dots fabricated by atomic force microscope nano-lithography
… AFML to fabricate graphene quantum dot systems. Transport measurements are carried out on our graphene quantum dots at low temperatures and high parallel magnetic fields and we try to understand the behaviour of spins in graphene. In our initial investigations into AFML we use graphene samples …
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Topological Insulators Interfaced with Trivial and Ferromagnetic Insulators. Selective contact and patterning of surface states.
… insulators which will enable us to probe their transport properties and can lead to their integration in existing technologies. This project has developed methods of fabricating TI devices which can allow characterisation and control of topological surface states. First, different etching …
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Split gate tunnel barriers in double top gated silicon metal-oxide-semiconductor nanostructures
… barriers of silicon have been examined using transport measurements. However, reliable interpretation of donor transport measurements depends critically on understanding the tunnel barriers separating the localized electron state from the source and drain reservoirs. In this thesis, split gate …
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New features in the phase diagrams of the cuprate high-Tc superconductors mapped using strong magnetic fields
… using high magnetic field electrical transport measurements. These discoveries attempt to address two central questions pertaining to how the physics of the cuprate high-Tc superconductors evolve as a function of both temperature and hole-doping. The first question addresses the nature …
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Elektrische Charakterisierung freistehender Nanodrähte mit dem Low Energy Electron Point Source Mikroskop
… By performing systematically length dependent transport measurements the contact contributions were separated from the intrinsic wire resistance, which allows the calculation of the specific resistivity. Besides various metallic and semiconducting materials (Cu, Co, Bi and CdS) special interest …
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Fluctuating and Phase -Stiff Proximity-Induced Superconductivity in Superconductor-Semiconductor Junctions
Results from transport measurements made on Nb/InGaAs heterojunctions show evidence of strong coupling across the superconductor-semiconductor interface. A novel 3-Terminal device geometry allows the simultaneous extraction of the specific contact conductance and the 2D sheet resistance in the …
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Effect of disorder on the vortex dynamics in superconducting Josephson junction arrays and clusters
… studied the effect of intrinsic disorder on the transport properties of large Josephson junction arrays and clusters. In large arrays, intrinsic random disorder results in the washing out of features in the magnetoresistance. It also gives rise to multiple onsets in the resistive transition as a …
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Exfoliation, Synthesis, and Characterization of Nanoscale Te
… synthesized Te wires were utilized in electron transport measurements. A four-terminal device showed a mobility of 51 cm2V-1s-1 at 2.8 K, a mobility lower than predicted due to the low quality of the Te wire. The contact resistance and resistivity of Te were estimated to be 9.4 kΩ and 9.4×10-4 …
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Electronic Transport in Thermoelectric Bismuth Telluride
… experimental investigation of the electronic transport properties of bismuth telluride nanocomposite materials is presented. The primary transport measurements are electrical conductivity, Seebeck coefficient and Hall effect. An experimental apparatus for measuring Hall effect and electrical …
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Critical currents in granular high temperature superconductors
… which generally exist between magnetic and transport measurements on HTSCs. In order to do this a number of systems were selected with different weak link strengths, overall alignment and pinning characteristics. Systematic studies were carried out on these systems using both transport and …
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Optoelectronic properties of size-selected silicon nanocrystals
… Layer growth, optical properties, charge transport, photoluminescence (PL) and electroluminescence (EL) were investigated on these porous layers. A stick-ball model for layer growth was developed and implemented by Monte-Carlo computer simulations. A limit value of 0.86 for the bulk …
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Electronic transport in low-angle twisted bilayer graphene
… graphene with controlled angle, and electronic transport measurements of the resulting high-quality samples are performed and discussed. We discover novel insulating states that purely results from the moiŕe superlattice band structure. The magnetotransport properties of these insulating states …
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