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 17 of 17 for “"Twisted Bilayer Graphene"”.
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Electronic transport in low-angle twisted bilayer graphene
Graphene is a two-dimensional material with exotic electronic, optical and mechanical properties. By stacking two layers of graphene together with a small rotation angle between them, a superlattice of arbitrarily large size can be formed. The hybridization of the electronic states in the two …
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Characterization of Magic-angle Twisted Bilayer Graphene using Microwave Techniques
Magic-angle twisted bilayer graphene (MATBG) is a highly tunable material platform that exhibits a wide range of novel phases, including correlated insulating states and unconventional superconductivity. Its tunability and potentially high kinetic inductance in the superconducting state are …
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Probing electron-electron and electron-phonon interactions in twisted bilayer graphene
… that when two pieces of atomically thin carbon (graphene) are twisted at 1.1° with respect to one another, they display a variety of effects, including superconducting behavior [10]. Experimental investigation of the behavior of small-angle twisted bilayer graphene (SA-TBG) as a function of twist …
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An efficient computational framework for prediction of corrugation in twisted bilayer graphene
… at a specific ""magic"" angle in twisted bilayer graphene (TBG) has stirred a lot of interest in the scientific community. When two graphene layers are placed on top of each other with a twist, a moir\'e pattern emerges. By controlling the period of the moir\'e in twisted bilayer …
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Twist angle physics in graphene based van der Waals heterostructures
In this thesis, I present my experimental work on twisted bilayer graphene, a van der Waals heterostructure consisting of two graphene sheets stack on top of each other. In particular, the twist angle is a new degree of freedom in this system, and has an important effect in the determination of its …
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Density Matrix Renormalization Group Studies of Strongly Correlated Systems in Low Dimensions
… order with chiral edge states. Regarding the twisted bilayer graphene which is found experimentally to emerge a superconducting phase at low temperature, we construct an auxiliary model and provide insights to the exotic ferromagnetic Mott state that may exists in the twisted bilayer graphene. …
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Thermodynamic and tunneling measurements of van der Waals heterostructures
… a material system commonly known as magic-angle twisted bilayer graphene (MATBG).
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Synthetic Topological Quantum Matter in Nanostructured 2D Materials for Quantum Information Processing
… materials, with a strong emphasis on graphene-based nanostructures, such as twisted multilayer graphene and triangular graphene quantum dots. The thesis is organized into six chapters, including an introduction and a conclusion. In Chapter 2, we present the theoretical methods used to …
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High-throughput characterisation and device integration of nanomaterials
… of nanomaterial devices using InAs nanowires, bilayer graphene, MoS2, and MoSe2/WSe2 lateral heterostructures. First, a novel method for nanofabrication is introduced using a lithography-optimised fiducial marker system LithoTag, which is used for the identification of individual InAs nanowires …
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Dynamic polarizability and collective modes in narrow-band electron systems
… moiré materials, in particular the magic angle twisted bilayer graphene, has emerged recently as a platform to study strongly interacting physics. This thesis analyzes the impact of the ultranarrow Bloch bands and strong electron-electron interactions on the dynamical polarization response of …
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Superlattices and quantum spin Hall states in graphene and hexagonal boron nitride heterostructures
Two-dimensional (2d) layered materials, such as graphene and hexagonal boron nitride (hBN), can be isolated separately and then stacked together to form heterostructures with crystalline interfaces between the layers. In this thesis, I present a series of experiments which explore the quantum …
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Spectral gaps for many-particle systems, semiclassical analysis of graphene, and quantum dynamics
… techniques, the squeezing of bands in a model of twisted bilayer graphene and related properties such as the so-called magic angles. In the final part, we study numerical aspects of quantum dynamics. Our first result is concerned with rates of quantum evolution under energy-constraints and …
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Graphene-Based Nanodevices in the Superconducting and Strongly Correlated Regimes
… 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 experiments via two …
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Strongly Correlated 2D Electronic Systems: Interplay between Band Topology and Electron-electron Interaction
… by these experiments, we studied various graphene-based moiré materials. We found that band topology and electron-electron interaction can be easily tuned by electric field in these systems, which opens the door for various fascinating quantum many-body phenomena such as the quantum Hall …
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Topological defects in single and multi-layer graphene
Since its monolayer exfoliation in 2004, graphene has been the focus of intense study revealing a multitude of exciting properties that allow for studying fundamental physics and new engineering devices. In particular, monolayer graphene has unique mechanical properties such as high in-plane …
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Coupling of deformation and electronic properties in two-dimensional materials
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Computation of van der Waals effects in layered materials
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms