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Electronic Properties of Graphene Heterostructures with Hexagonal Crystals

Author: John R. Wallbank

Publisher: Springer

Published: 2014-06-13

Total Pages: 101

ISBN-13: 3319077228

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The last decade has witnessed the discovery of, and dramatic progress in understanding the physics of graphene and related two-dimensional materials. The development of methods for manufacturing and aligning high-quality two-dimensional crystals has facilitated the creation of a new generation of materials: the heterostructures of graphene with hexagonal crystals, in which the graphene electrons acquire new, qualitatively different properties. This thesis provides a comprehensive theoretical framework in which to understand these heterostructures, based on the tight binding model, perturbation theory, group theory and the concept of the moire superlattice (all of which are elucidated). It explains how graphene heterostructures provide new opportunities for tailoring band structure, such as creating additional Dirac points or opening band gaps and how they manifest themselves in transport measurements, optical absorption spectra and the fractal Hofstadter spectra. Also considered are the heterostructures of bilayer graphene and resonant tunneling in aligned graphene/insulator/graphene devices.

Book Synopsis Electronic Properties of Graphene Heterostructures with Hexagonal Crystals by : John R. Wallbank

Download or read book Electronic Properties of Graphene Heterostructures with Hexagonal Crystals written by John R. Wallbank and published by Springer. This book was released on 2014-06-13 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last decade has witnessed the discovery of, and dramatic progress in understanding the physics of graphene and related two-dimensional materials. The development of methods for manufacturing and aligning high-quality two-dimensional crystals has facilitated the creation of a new generation of materials: the heterostructures of graphene with hexagonal crystals, in which the graphene electrons acquire new, qualitatively different properties. This thesis provides a comprehensive theoretical framework in which to understand these heterostructures, based on the tight binding model, perturbation theory, group theory and the concept of the moire superlattice (all of which are elucidated). It explains how graphene heterostructures provide new opportunities for tailoring band structure, such as creating additional Dirac points or opening band gaps and how they manifest themselves in transport measurements, optical absorption spectra and the fractal Hofstadter spectra. Also considered are the heterostructures of bilayer graphene and resonant tunneling in aligned graphene/insulator/graphene devices.

Electronic Properties of Graphene Heterostructures with Hexagonal Crystals

Author: John Wallbank

Publisher:

Published: 2014-07-31

Total Pages: 112

ISBN-13: 9783319077239

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Book Synopsis Electronic Properties of Graphene Heterostructures with Hexagonal Crystals by : John Wallbank

Download or read book Electronic Properties of Graphene Heterostructures with Hexagonal Crystals written by John Wallbank and published by . This book was released on 2014-07-31 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Geometric and Electronic Properties of Graphene-Related Systems

Author: Ngoc Thanh Thuy Tran

Publisher: CRC Press

Published: 2017-11-22

Total Pages: 232

ISBN-13: 1351368478

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Due to its physical, chemical, and material properties, graphene has been widely studied both theoretically and experimentally since it was first synthesized in 2004. This book explores in detail the most up-to-date research in graphene-related systems, including few-layer graphene, sliding bilayer graphene, rippled graphene, carbon nanotubes, and adatom-doped graphene, among others. It focuses on the structure-, stacking-, layer-, orbital-, spin- and adatom-dependent essential properties, in which single- and multi-orbital chemical bondings can account for diverse phenomena. Geometric and Electronic Properties of Graphene-Related Systems: Chemical Bonding Schemes is excellent for graduate students and researchers, but understandable to undergraduates. The detailed theoretical framework developed in this book can be used in the future characterization of emergent materials.

Book Synopsis Geometric and Electronic Properties of Graphene-Related Systems by : Ngoc Thanh Thuy Tran

Download or read book Geometric and Electronic Properties of Graphene-Related Systems written by Ngoc Thanh Thuy Tran and published by CRC Press. This book was released on 2017-11-22 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to its physical, chemical, and material properties, graphene has been widely studied both theoretically and experimentally since it was first synthesized in 2004. This book explores in detail the most up-to-date research in graphene-related systems, including few-layer graphene, sliding bilayer graphene, rippled graphene, carbon nanotubes, and adatom-doped graphene, among others. It focuses on the structure-, stacking-, layer-, orbital-, spin- and adatom-dependent essential properties, in which single- and multi-orbital chemical bondings can account for diverse phenomena. Geometric and Electronic Properties of Graphene-Related Systems: Chemical Bonding Schemes is excellent for graduate students and researchers, but understandable to undergraduates. The detailed theoretical framework developed in this book can be used in the future characterization of emergent materials.

Electronic Properties of Heterostructures of 2D Materials

Author: Wafa Hadadi

Publisher:

Published: 2020

Total Pages:

ISBN-13:

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Researchers have recently become interested in two-dimensional materials such as graphene, hexagonal boron nitride (h-BN), Transition Metal Dichalcogenides (TMDs), etc. Their 2D hexagonal structures result in unique properties, which make these materials attractive for scientists and engineers. In this work, we investigated the electronic properties of graphene, h-BN, and MoS2 based on density functional theory (DFT). We first studied the electronic properties of monolayers of different materials. We found a zero bandgap and observed massless Dirac Hamiltonian in graphene. For h-BN, a large bandgap at K-point was observed. Also, we observed the bandgap opening in MoS2 and a strong splitting of its bands. Then, we extended these studies to graphene and h-BN bilayers. For graphene bilayer, we observed a gapless material and massive Dirac fermions. For h-BN bilayer, an indirect bandgap was observed, smaller in comparison with its monolayer. The main focus of this study was the investigation of graphene/h-BN heterostructures for different stacking configurations. The suitability of h-BN as a substrate for graphene is due to its small lattice constant mismatch with graphene and its high insulating gap (~ 5 eV). Another important aspect to be observed in graphene/h-BN heterostructures is the gap opening brought by the h-BN layer proximity to the initially gapless graphene layer. We found the effect of bandgap opening in graphene/h- BN and determined the most stable configuration which is the AB[CB]. This work supports the findings of many researchers who demonstrate that graphene/h-BN heterostructures are very useful as building blocks for nanodevices with desirable electronic properties.

Book Synopsis Electronic Properties of Heterostructures of 2D Materials by : Wafa Hadadi

Download or read book Electronic Properties of Heterostructures of 2D Materials written by Wafa Hadadi and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers have recently become interested in two-dimensional materials such as graphene, hexagonal boron nitride (h-BN), Transition Metal Dichalcogenides (TMDs), etc. Their 2D hexagonal structures result in unique properties, which make these materials attractive for scientists and engineers. In this work, we investigated the electronic properties of graphene, h-BN, and MoS2 based on density functional theory (DFT). We first studied the electronic properties of monolayers of different materials. We found a zero bandgap and observed massless Dirac Hamiltonian in graphene. For h-BN, a large bandgap at K-point was observed. Also, we observed the bandgap opening in MoS2 and a strong splitting of its bands. Then, we extended these studies to graphene and h-BN bilayers. For graphene bilayer, we observed a gapless material and massive Dirac fermions. For h-BN bilayer, an indirect bandgap was observed, smaller in comparison with its monolayer. The main focus of this study was the investigation of graphene/h-BN heterostructures for different stacking configurations. The suitability of h-BN as a substrate for graphene is due to its small lattice constant mismatch with graphene and its high insulating gap (~ 5 eV). Another important aspect to be observed in graphene/h-BN heterostructures is the gap opening brought by the h-BN layer proximity to the initially gapless graphene layer. We found the effect of bandgap opening in graphene/h- BN and determined the most stable configuration which is the AB[CB]. This work supports the findings of many researchers who demonstrate that graphene/h-BN heterostructures are very useful as building blocks for nanodevices with desirable electronic properties.

Electronic Properties of Rhombohedral Graphite

Author: Servet Ozdemir

Publisher: Springer Nature

Published: 2021-10-25

Total Pages: 142

ISBN-13: 3030883078

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This thesis presents the first systematic electron transport investigation of rhombohedral graphite (RG) films and thus lies at the interface of graphene physics, vdW heterostructure devices and topological matter. Electron transport investigation into the rhombohedral phase of graphite was limited to a few layers of graphene due to the competing hexagonal phase being more abundant. This work reports that in exfoliated natural graphite films, rhombohedral domains of up to 50 layers can be found. In the low energy limit, these domains behave as an N-layer generalisation of graphene. Moreover, being a potential alternative to twisted bilayer graphene systems, RG films show a spontaneous metal-insulator transition, with characteristic symmetry properties that could be described by mean-field theory where superconductivity is also predicted in these low energy bands. A nodal-line semimetal in the bulk limit, RG thin films are a 3D generalisation of the simplest topological insulator model: the Su-Schrieffer-Heeger chain. Similar to the more usual topological insulators, RG films exhibit parallel conduction of bulk states, which undergo three-dimensional quantum transport that reflects bulk topology.

Book Synopsis Electronic Properties of Rhombohedral Graphite by : Servet Ozdemir

Download or read book Electronic Properties of Rhombohedral Graphite written by Servet Ozdemir and published by Springer Nature. This book was released on 2021-10-25 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first systematic electron transport investigation of rhombohedral graphite (RG) films and thus lies at the interface of graphene physics, vdW heterostructure devices and topological matter. Electron transport investigation into the rhombohedral phase of graphite was limited to a few layers of graphene due to the competing hexagonal phase being more abundant. This work reports that in exfoliated natural graphite films, rhombohedral domains of up to 50 layers can be found. In the low energy limit, these domains behave as an N-layer generalisation of graphene. Moreover, being a potential alternative to twisted bilayer graphene systems, RG films show a spontaneous metal-insulator transition, with characteristic symmetry properties that could be described by mean-field theory where superconductivity is also predicted in these low energy bands. A nodal-line semimetal in the bulk limit, RG thin films are a 3D generalisation of the simplest topological insulator model: the Su-Schrieffer-Heeger chain. Similar to the more usual topological insulators, RG films exhibit parallel conduction of bulk states, which undergo three-dimensional quantum transport that reflects bulk topology.

Phosphorene: Physical Properties, Synthesis, and Fabrication

Author: Yongqing Cai

Publisher: CRC Press

Published: 2019-09-16

Total Pages: 293

ISBN-13: 1351358340

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This book is the first attempt to systematically present the knowledge and research progress of phosphorene, another elemental 2D material that can be exfoliated by mechanical or liquid methods as the intensively studied graphene. The book provides a comprehensive overview of the synthesis, growth, characterization, and applications of phosphorene. It also compiles cutting-edge research in the related field with respect to thermal conduction, transistors, and electrochemical applications and encompasses the intrinsic properties (structural, electronic, defective, and phononic) of phosphorene. This book provides detailed mechanisms of phenomena observed for phosphorene. It will benefit graduate students of physics, chemistry, electrical and electronics engineering, and materials science and engineering; researchers in nanoscience working on phosphorene and similar 2D materials; and engineers and anyone involved in nanotechnology, nanoelectronics, materials preparation, and device fabrication based on layered materials.

Book Synopsis Phosphorene: Physical Properties, Synthesis, and Fabrication by : Yongqing Cai

Download or read book Phosphorene: Physical Properties, Synthesis, and Fabrication written by Yongqing Cai and published by CRC Press. This book was released on 2019-09-16 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first attempt to systematically present the knowledge and research progress of phosphorene, another elemental 2D material that can be exfoliated by mechanical or liquid methods as the intensively studied graphene. The book provides a comprehensive overview of the synthesis, growth, characterization, and applications of phosphorene. It also compiles cutting-edge research in the related field with respect to thermal conduction, transistors, and electrochemical applications and encompasses the intrinsic properties (structural, electronic, defective, and phononic) of phosphorene. This book provides detailed mechanisms of phenomena observed for phosphorene. It will benefit graduate students of physics, chemistry, electrical and electronics engineering, and materials science and engineering; researchers in nanoscience working on phosphorene and similar 2D materials; and engineers and anyone involved in nanotechnology, nanoelectronics, materials preparation, and device fabrication based on layered materials.

Electronic Properties of Misoriented Two-dimensional Materials

Author: Supeng Ge

Publisher:

Published: 2017

Total Pages: 94

ISBN-13: 9781369833027

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Van der Waals (vdW) heterostructures assembled from monolayers (one or a few) of graphene, hexagonal boron nitride (h-BN) are emerging as a new paradigm with which to attain desired electronic properties. Graphene/h-BN heterostructures have higher carrier mobility and better device performance when compared with traditional devices of graphene on SiO2/Si substrate. Vertical interlayer tunneling in Gr/BN/Gr structures display negative differential resistance (NDR). These exceptional electrical properties has attracted intense attentions for energy band engineering and device performance optimization. Interlayer electron transport through a graphene / hexagonal boron-nitride (h-BN) / graphene heterostructure is strongly affected by the misorientation angle & thetas; of the h-BN with respect to the graphene layers with different physical mechanisms governing the transport in different regimes of angle, Fermi level, and bias. The different mechanisms and their resulting signatures in resistance and current are analyzed using two different models, a tight-binding, non-equilibrium Green function model and an effective continuum model, and the qualitative features resulting from the two different models compare well. In the large-angle regime (& thetas;> 4°), the change in the effective h-BN bandgap seen by an electron at the K point of the graphene causes the resistance to monotonically increase with angle by several orders of magnitude reaching a maximum at & thetas; = 30°. It does not affect the peak-to-valley current ratios in devices that exhibit negative differential resistance. In the small-angle regime (& thetas;

Book Synopsis Electronic Properties of Misoriented Two-dimensional Materials by : Supeng Ge

Download or read book Electronic Properties of Misoriented Two-dimensional Materials written by Supeng Ge and published by . This book was released on 2017 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: Van der Waals (vdW) heterostructures assembled from monolayers (one or a few) of graphene, hexagonal boron nitride (h-BN) are emerging as a new paradigm with which to attain desired electronic properties. Graphene/h-BN heterostructures have higher carrier mobility and better device performance when compared with traditional devices of graphene on SiO2/Si substrate. Vertical interlayer tunneling in Gr/BN/Gr structures display negative differential resistance (NDR). These exceptional electrical properties has attracted intense attentions for energy band engineering and device performance optimization. Interlayer electron transport through a graphene / hexagonal boron-nitride (h-BN) / graphene heterostructure is strongly affected by the misorientation angle & thetas; of the h-BN with respect to the graphene layers with different physical mechanisms governing the transport in different regimes of angle, Fermi level, and bias. The different mechanisms and their resulting signatures in resistance and current are analyzed using two different models, a tight-binding, non-equilibrium Green function model and an effective continuum model, and the qualitative features resulting from the two different models compare well. In the large-angle regime (& thetas;> 4°), the change in the effective h-BN bandgap seen by an electron at the K point of the graphene causes the resistance to monotonically increase with angle by several orders of magnitude reaching a maximum at & thetas; = 30°. It does not affect the peak-to-valley current ratios in devices that exhibit negative differential resistance. In the small-angle regime (& thetas;

Optical and Electrical Properties of Nanoscale Materials

Author: Alain Diebold

Publisher: Springer Nature

Published: 2022-01-10

Total Pages: 495

ISBN-13: 3030803236

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This book covers the optical and electrical properties of nanoscale materials with an emphasis on how new and unique material properties result from the special nature of their electronic band structure. Beginning with a review of the optical and solid state physics needed for understanding optical and electrical properties, the book then introduces the electronic band structure of solids and discusses the effect of spin orbit coupling on the valence band, which is critical for understanding the optical properties of most nanoscale materials. Excitonic effects and excitons are also presented along with their effect on optical absorption. 2D materials, such as graphene and transition metal dichalcogenides, are host to unique electrical properties resulting from the electronic band structure. This book devotes significant attention to the optical and electrical properties of 2D and topological materials with an emphasis on optical measurements, electrical characterization of carrier transport, and a discussion of the electronic band structures using a tight binding approach. This book succinctly compiles useful fundamental and practical information from one of the fastest growing research topics in materials science and is thus an essential compendium for both students and researchers in this rapidly moving field.

Book Synopsis Optical and Electrical Properties of Nanoscale Materials by : Alain Diebold

Download or read book Optical and Electrical Properties of Nanoscale Materials written by Alain Diebold and published by Springer Nature. This book was released on 2022-01-10 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the optical and electrical properties of nanoscale materials with an emphasis on how new and unique material properties result from the special nature of their electronic band structure. Beginning with a review of the optical and solid state physics needed for understanding optical and electrical properties, the book then introduces the electronic band structure of solids and discusses the effect of spin orbit coupling on the valence band, which is critical for understanding the optical properties of most nanoscale materials. Excitonic effects and excitons are also presented along with their effect on optical absorption. 2D materials, such as graphene and transition metal dichalcogenides, are host to unique electrical properties resulting from the electronic band structure. This book devotes significant attention to the optical and electrical properties of 2D and topological materials with an emphasis on optical measurements, electrical characterization of carrier transport, and a discussion of the electronic band structures using a tight binding approach. This book succinctly compiles useful fundamental and practical information from one of the fastest growing research topics in materials science and is thus an essential compendium for both students and researchers in this rapidly moving field.

Electronic Properties of Graphene Tuned by Two-dimensional Crystals

Author: Yu Han

Publisher:

Published: 2015

Total Pages: 130

ISBN-13:

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Book Synopsis Electronic Properties of Graphene Tuned by Two-dimensional Crystals by : Yu Han

Download or read book Electronic Properties of Graphene Tuned by Two-dimensional Crystals written by Yu Han and published by . This book was released on 2015 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

2D Materials

Author: Phaedon Avouris

Publisher: Cambridge University Press

Published: 2017-06-29

Total Pages: 521

ISBN-13: 1316738132

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Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.

Book Synopsis 2D Materials by : Phaedon Avouris

Download or read book 2D Materials written by Phaedon Avouris and published by Cambridge University Press. This book was released on 2017-06-29 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn about the most recent advances in 2D materials with this comprehensive and accessible text. Providing all the necessary materials science and physics background, leading experts discuss the fundamental properties of a wide range of 2D materials, and their potential applications in electronic, optoelectronic and photonic devices. Several important classes of materials are covered, from more established ones such as graphene, hexagonal boron nitride, and transition metal dichalcogenides, to new and emerging materials such as black phosphorus, silicene, and germanene. Readers will gain an in-depth understanding of the electronic structure and optical, thermal, mechanical, vibrational, spin and plasmonic properties of each material, as well as the different techniques that can be used for their synthesis. Presenting a unified perspective on 2D materials, this is an excellent resource for graduate students, researchers and practitioners working in nanotechnology, nanoelectronics, nanophotonics, condensed matter physics, and chemistry.