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 55 for “"Bilayer graphene"”.
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Theory of Bilayer Graphene Spectroscopy.
… we model theoretically spectra measured for bilayer graphene obtained using the angle-resolved photoemission spectroscopy, magneto-optical absorption spectroscopy and electronic Raman spectroscopy The theories are based on the tight-binding description of the pi bands in the material. In …
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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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Quantum many body physics in single and bilayer graphene
… avenue for investigation of many body physics. Graphene constitutes a new and unusual 2DES, which may give rise to unexpected collective phenomena. However, the vanishing density of states in charge neutral single layer graphene suppresses many body effects, and one has to alter the system to …
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Electronic properties of bilayer graphene in a steady magnetic field
… thesis, we consider the electronic properties of bilayer graphene in a steady, parallel magnetic field. Using the tight–binding model, and taking into account relevant tight–binding parameters, we find a new contribution to the electronic Hamiltonian describing the orbital effect of the magnetic …
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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 graphene, …
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Bilayer graphene growth by low pressure chemical vapor deposition on copper foil
Successfully integrating graphene in standard processes for applications in electronics relies on the synthesis of high-quality films. In this work we study Low Pressure Chemical Vapor Deposition (LPCVD) growth of bilayer graphene on the outside surface of copper enclosures. The effect of several …
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Interlayer Defect Effects on the Phonon Properties of Bilayer Graphene and its Nanoribbon
Phonon properties of AB (Bernal) stacked bilayer graphene (BLG) with various types of defects have been investigated theoretically. Forced Vibrational (FV) method has been employed to compute the phonon modes of disordered BLG. A downward linear shift of E2g mode frequencies has been observed with …
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Synthesis of bilayer graphene and hexagonal boron nitride by chemical vapor deposition method
… is to develop a reliable method for synthesizing bilayer graphene using chemical vapor deposition (CVD) method and to understand the growth mechanism. The second part involves exploring methods of synthesizing hexagonal boron nitride (hBN). The successful isolation of monolayer graphene in 2004 …
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The Hofstadter spectrum of monolayer and bilayer graphene van der Waals heterostructures with boron nitride
… of materials created by stacking two-dimensional graphene layers. The first material is a heterostructure created by placing a graphene layer on top of a layer of hexagonal boron nitride. The energy bands are determined as well as the energy spectrum in the presence of a magnetic field applied in …
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Electronic properties and device applications of rotationally controlled van der Waals heterostructures
… a rotationally aligned double monolayer graphene using a sequential pick-up of two graphene layers, which originate from a single crystal domain, and compare it with Bernal stacked bilayer graphene using Raman spectroscopy, scanning probe microscopy (SPM), and electrical transport …
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Quantum transport in graphene heterostructures
The two dimensional charge carriers in mono- and bilayer graphene are described by massless and massive chiral Dirac Hamiltonians, respectively. This thesis describes low temperature transport experiments designed to probe the consequences of this basic fact. The first part concerns the effect of …
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The fractional quantum Hall regime in graphene
… gaps in the fractional quantum Hall states of graphene. The theory relies on knowledge of these properties for filling fractions smaller than one. Then, by the application of two mapping rules, one is able to obtain these properties for fractional quantum Hall states at arbitrary fillings, by …
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Scanning tunneling microscopy and spectroscopy of graphene on semiconducting surfaces
… of the physical and electronic structure of graphene monolayers and bilayers due to interactions with the supporting substrate, we have utilized scanning tunneling microscopy (STM) and spectroscopy (STS) to probe the graphene-substrate interaction for graphene on several different …
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Twist angle physics in graphene based van der Waals heterostructures
… 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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Quantum Hall transport in graphene and its bilayer
Graphene has generated great interest in the scientific community since its discovery because of the unique chiral nature of its carrier dynamics. In monolayer graphene, the relativistic Dirac spectrum for the carriers results in an unconventional integer quantum Hall effect, with a peculiar Landau …
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Studies of bilayer and trilayer graphene
Graphene is a single 2-dimensional atomic layer of hexagonally packed carbon atoms. Graphene has a unique combination of thermal, mechanical, and electronic properties, making it a useful tool for learning new physics as well as a material with high potential for applications. Bilayer graphene …
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