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 35 for “"Hexagonal boron nitride (hBN)"”.
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Atomistic modeling and simulations of 2D materials : chemical vapor deposition, nanoporous defects, force-field development, wetting, and friction
… (TMDs) (e.g., molybdenum disulfide (MoS₂)), and hexagonal boron nitride (hBN), have recently received considerable attention, due to their layer-number-dependent optoelectronic, mechanical, and barrier properties. However, physical understanding of the controlled synthesis and interfacial …
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Kinetic Inductance Characterization of Thin 2H-NbSe₂ Superconductor Using Circuit Quantum Electrodynamics
… contact thin NbSe₂, entirely encapsulated with hexagonal Boron Nitride (hBN), with a coplanar Al resonator. Then we fabricated hybrid Al-NbSe₂ resonators and measured the kinetic inductance of thin NbSe₂ at low-temperature and low-photon number limits. In this thesis, we discuss the observed …
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Synthesis of bilayer graphene and hexagonal boron nitride by chemical vapor deposition method
… part involves exploring methods of synthesizing hexagonal boron nitride (hBN). The successful isolation of monolayer graphene in 2004 has attracted many researchers to search for potential applications of graphene and other two-dimensional materials in electronic and optical devices. However, the …
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Photocurrent Spectroscopy Study of Graphene / Hexagonal Boron Nitride Moiré Superlattice In the Far-Infrared Regime
… Then I will apply it to the monolayer graphene / hexagonal boron nitride (hBN) moiré superlattices, where I accurately measure the gap ∆ opened at charge-neutral point (CNP) by the moiré superlattice. The relationship between the gap size and the moiré wavelength will also be discussed. Finally, I …
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Control of Excitons and Quantum Emitters in Two-Dimensional Materials
… emitters have been identified in an insulating hexagonal boron nitride (hBN) and semiconducting transition metal dichalcogenides (TMDs). In spite of the unique characteristics of these emitters, they suffer from large inhomogeneous distribution because of their proximity to the surface and …
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Large-scale density functional theory study of van-der-Waals heterostructures
… (TMDC) or black phosphorus (BP) and hexagonal boron nitride (hBN). We show that hBN can protect BP from external influences, while also preventing the band-gap reduction in BP stacks, and enabling the use of BP heterostructures as tunnelling field effect transistors. Moreover, our …
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Developing force field parameters for water interacting with graphene and graphene-like materials
… towards graphene-analogous materials including hexagonal boron nitride (hBN) and molybdenum disulfide (MoS2). Compared to graphene, the graphene-analogous materials possess non-zero bandgap, chemical inertness, and biological compatibility. The graphene-analogous materials are promising …
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Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
Hexagonal boron nitride has attracted a lot of interest in the deep UV community of late. Due to its wide bandgap (~ 6 eV), hBN has a significant potential for deep ultraviolet (DUV) photonic device applications. Additionally, the high neutron capture cross-section of the isotope boron-10 makes hBN …
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Quantum transport in graphene heterostructures
… part of the work describes the development of hexagonal boron nitride (hBN), an insulating isomorph of graphite, as a substrate and gate dielectric for graphene electronics. We use the enhanced mobility of electrons in h-BN supported graphene to investigate the effect of electronic …
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Developing and Characterizing Sources of Quantum States of Light: from Single Photons to Million-Photon Fock States
… of single photon emitters (SPEs) in hexagonal boron nitride (hBN) at optical wavelengths. Specifically, I demonstrate how one can extract information about electron-phonon coupling in SPEs from photoluminescence spectra in order to characterize fidelity in generating N=1 Fock states. …
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Electron beam processing and spectroscopic characterisation of 2D materials and novel nanostructures
… (2D) materials black phosphorus (BP) and hexagonal boron nitride (hBN) has exponentially risen due to the distinct advantages they possess over their bulk counterparts. Excellent and unique mechanical, electronic and optical properties have recently been discovered which can potentially …
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Performance evaluation of biodegradable metalworking fluids for machining process
… MJO5 (3.5:1). Later, the MJOs were blended with hexagonal boron nitride (hBN) particles at various concentrations (0.05 to 0.5wt.%). MJOs with and without hBN particles were analysed based on the physicochemical properties, tribology behaviour test, orthogonal cutting and turning proses. From the …
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Spectroscopy and rational chemical design of single emitters for quantum photonics
… quantum defects in monolayers of two-dimensional hexagonal Boron Nitride (hBN). In the third part, I develop and validate a lineshape model for single CdSe/CdS coreshell quantum dots and show that optical phonons play a pivotal role in determining the room temperature emission linewidth. I …
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Superlattices and quantum spin Hall states in graphene and hexagonal boron nitride heterostructures
… (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 transport of …
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The Electronic Compressibility of Rhombohedral Graphene Multilayers
… electronic compressibility of R5G aligned to a hexagonal boron nitride (hBN) substrate to form a moiré superlattice. Motivated by the recent discovery of the fractional quantum anomalous Hall effect in this system when the electrons are pushed away from the moiré interface by an external …
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Tribological performance of jatropha oil-based nanofluids for orthogonal cutting process
… process. Subsequently, the MJOs were mixed with hexagonal boron nitride (hBN), graphene and copper oxide (CuO) nanoparticles at various concentrations (i.e. 0.01 to 0.05 wt.%). The performance of MJOs was analysed based on the physicochemical properties, tribological behavior and orthogonal …
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Visible Emitters in Hexagonal Boron Nitride as an Optically Addressable Spin Qubit Platform
… visible emitters embedded in epitaxially grown hexagonal boron nitride (hBN) films, displaying bright single-photon emission and quantum coherent spins under ambient conditions. Two optically addressable electronic spin manifolds in these defects are described, investigated using optically …
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Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors
… a new class of heterostructure materials. Hexagonal boron- nitride (hBN), is a great candidate to be stacked with graphene due to an atomically 2-D layered structure with a lattice constant very similar to graphene (1.8% mismatch), large electrical band gap (∼4.7eV), and excellent thermal …
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Growth and characterization of high-quality bulk hexagonal boron nitride crystals
While hexagonal boron nitride (hBN) in polycrystalline form has met demand for its mechanical, chemical, and thermal applications, its new electronic, optoelectronic, and nanophotonic applications required single crystals with low residual impurity concentrations. Grain boundaries and impurities …
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Quantum transport in gapped graphene
… local and nonlocal transport properties in hexagonal boron nitride (hBN)/graphene superlattice Hall bars and graphene Hall bars proximity coupled to the ferrimagnetic insulator yttrium iron garnet ($\text{Y}_{3}\text{Fe}_{5}\text{O}_{12}$ or YIG). The first part describes in detail the pulse …
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