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 23 for “"2d systems"”.
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… transport in these low-dimensional semiconductor systems. In Chapter 2, low temperature spectroscopy and time-resolved photoluminescence spectroscopy are used to probe the complex energy landscape seen by excitons in acid-treated MoS₂. We show that deeply trapped "dark" exciton states are …
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Effects of pore-scale fluid flow on fluid-solid reactions in porous and fractured media
… flow topology differs between two-dimensional (2D) and three-dimensional (3D) systems, potentially leading to fundamental differences in reactive transport dynamics. However, most previous studies have investigated fluid-solid reactions in 2D systems without considering fluid inertia, and our …
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Photocurrent Spectroscopy Study of Graphene / Hexagonal Boron Nitride Moiré Superlattice In the Far-Infrared Regime
Two-dimensional (2D) materials and their heterostructures, especially those with moiré superlattices, have been one of the most fascinating topics in physics in recent years. Many interesting physics, for example the correlated insulating state at half- or quarter- fillings of the moiré band, …
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Proximity effects and vortex dynamics in mesoscopic superconductor-normal metal-superconductor arrays
… in characterizing the behavior of real systems, that is, those possessing any amount of disorder. The theory predicts that, at zero temperature in 1D and 2D systems, the diffusive motion of electrons scattering off impurities ceases, and there is no long range electron transport. In …
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Single-layer transport measurements of bilayer 2D electron and hole systems in GaAs heterostructures
… thesis we have studied bilayer two-dimensional (2D) electron and hole systems in GaAs. The work consists of three experimental 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 …
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Quantum Monte Carlo study of low dimensional materials
… several challenging problems in low-dimensional systems, which have rarely or never been studied using quantum Monte Carlo methods. It begins with an investigation into weak van der Waals-like interactions in bilayer graphene and extends to graphene placed on top of boron nitride at four …
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Estimation of the Real Area of Contact in Sliding Systems Using Thermal Measurements
… temperatures through thermal measurements in 1D/2D systems. This allows computationally easier models, resulting in faster simulations within acceptable convergence. The second objective is to provide experimental design guidance. The methods used are a modified cellular automata technique for …
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3D imaging in forensic odontology
… skin. When documenting bite marks with standard 2D cameras, errors in photographic technique can occur if best practice is not followed. Subsequent forensic analysis of the mark is problematic when a 3D structure is recorded in a 2D space. A 3D image capture and processing system might avoid the …
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Development of a Novel Single-Cell Attachment and Spreading Platform Utilizing Fused-Fiber Nanonets
… Cell spreading has been well-recognized in 2D systems, however, the native fibrous ECM presents cells with 3D biophysical cues. Thus, using suspended fibers as model systems, we present the development of a novel platform (Cell-STEPs) capable of capturing cell attachment dynamics and forces …
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3D Facial Feature Extraction and Recognition. An investigation of 3D face recognition: correction and normalisation of the facial data, extraction of facial features and classification using machine learning techniques.
… of possible applications for face recognition systems. Another reason is the emergence of affordable hardware, supporting digital photography and video, which have made the acquisition of high-quality and high resolution 2D images much more ubiquitous. However, 2D recognition systems are …
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MBE growth and STM study of chalcogenide thin films
… work here has been superconductivity. Studying 2D and quasi-2D systems is key to our understanding of high T$_c$ superconductivity. But although the motivation of this dissertation has been the study of superconductivity, the actual phenomena studied in this dissertation have been film-substrate …
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Tunneling spectroscopy of the two-dimensional electron gas
… (DOS) of a two-dimensional electron system (2DES) in a GaAs/AlGaAs heterostructure. Using a technique that we call "Time Domain Capacitance Spectroscopy" (TDCS), we measure the complete current-voltage characteristics for tunneling into the 2DES without making ohmic contacts to it. TDCS …
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Graphene-Based Nanodevices in the Superconducting and Strongly Correlated Regimes
… variety of physical properties accessible in 2D systems. Graphene, a carbon-based 2D hexagonal lattice, possesses exceptional properties that since its discovery in 2004 have attracted wide attention from the scientific and engineering communities. In this work, I present a series of …
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Space radiation-induced bystander signaling in 2D and 3D skin tissue models
… between different cell types cultured within 2D and 3D tissue architectures. 2D bystander signaling was investigated using a transwell insert system in which normal human fibroblasts (A) and keratinocytes (K) were irradiated with 1 GeV/n protons or iron ions at the NASA Space Radiation …
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Spectroscopic study of emergent electronic phases in transition metal based compounds
… spin phenomena in free-standing two-dimensional (2D) systems and nanoscale devices. Among possible multiferroic vdW materials, several families have been identified, and of particular promise is the magnetic semiconductor NiI₂. The multiferroic state of NiI₂ is characterized by a proper-screw spin …
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Plasmonics Using High Quality Epitaxial Graphene: An Approach towards Next-Generation Optical Computing
… detection and propagation, not present in usual 2D systems with parabolic dispersion. </p> <p> In this thesis we propose epitaxial graphene (EG) grown on SiC, a revolutionary carbon nanomaterial for SPP guiding, leading dramatic improvements over traditional SPP metal waveguides, with shrinkages …
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Physical Factors Regulating Human Trophoblast Invasion
… benefits compared with two-dimensional (2D) systems used previously. Importantly, only cells expressing the HLAG antigen, a marker for the extravillous phenotype are analysed. The stiffness of decidual tissues at the maternal-fetal interface was determined using atomic force microscopy. …
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Nonlinear dynamics and chaos in multidimensional disordered Hamiltonian systems
… chaotic behavior of multidimensional Hamiltonian systems in the presence of nonlinearity and disorder. It is known that any localized initial excitation in a large enough linear disordered system spreads for a finite amount of time and then halts forever. This phenomenon is called Anderson …
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Exploring Quantum Phenomena in 2D Materials: From Valley Topology and Exciton Selection Rules to Tuning Magnetic Correlations
… under the common theme of quantum phenomena in 2D materials: Part I introduces a gauge-invariant, quantized interband index for multiband 2D systems and uses it in two applications: A) to analyze valley topology, and B) to derive gauge-invariant exciton selection rules. Part II investigates …
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Dynamical structures and manifold detection in 2D and 3D chaotic flows
… uns einen ersten Überblick über die Dynamik des Systems geben, dass heisst, mit ihrer Hilfe sind wir in der Lage, das System zu charakterisieren und eventuell sogar seine Dynamik vorherzusagen. Die Visualisierung der dynamischen Strukturen, speziell in geschlossenen chaotischen Systemen, ist ein …
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