Optical Study On Two Dimensional Transition Metal Dichalcogenides

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Optical Study on Two Dimensional Transition Metal Dichalcogenides

Author : Bairen Zhu
Publisher : Open Dissertation Press
ISBN 13 : 9781361367148
Total Pages : pages
Book Rating : 4.3/5 (671 download)

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Book Synopsis Optical Study on Two Dimensional Transition Metal Dichalcogenides by : Bairen Zhu

Download or read book Optical Study on Two Dimensional Transition Metal Dichalcogenides written by Bairen Zhu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Optical Study on Two Dimensional Transition Metal Dichalcogenides" by Bairen, Zhu, 朱柏仁, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Atomically thin group-VI transition metal dichalcogenides (TMDC) has been emerging as a family of intrinsic 2-dimensional (2D) crystals with a sizeable bandgap in the visible and near infrared range, satisfying numerous requirements for ultimate electronics and optoelectronics. This intrinsic 2D crystal also provides a perfect platform for physics study in 2D semiconductors. The characteristic inversion symmetry breaking presented in monolayer TMDCs leads to non-zero but contrasting Berry curvatures and orbital magnetic moments at K/K' valleys located at the corners of the first Brillouin zone. These features provide an opportunity to manipulate electrons' additional internal degrees of freedom, namely the valley degree of freedom, making monolayer TMDC a promising candidate for the conceptual valleytronics. Besides, the strong spin-orbit interactions and the subsequent spin-valley coupling demonstrated in 2D TMDCs open potential new routes towards quantum manipulation. In this thesis, I give a brief review on the background and our progress of the physics study in 2D TMDCs (MoS2, WS2) via optical spectroscopy. Particularly, our experimental approach on the excitonic effect, valley dependent circular dichroism, and the spin-valley coupling in monolayer and bilayer TMDCs are elaborated in individual chapters. DOI: 10.5353/th_b5351031 Subjects: Transition metal compounds - Optical properties Chalcogenides - Optical properties

Optical Study on Two Dimensional Transition Metal Dichalcogenides

Author : 朱柏仁
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (97 download)

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Book Synopsis Optical Study on Two Dimensional Transition Metal Dichalcogenides by : 朱柏仁

Download or read book Optical Study on Two Dimensional Transition Metal Dichalcogenides written by 朱柏仁 and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-Dimensional Transition-Metal Dichalcogenides

Author : Alexander V. Kolobov
Publisher : Springer
ISBN 13 : 3319314505
Total Pages : 545 pages
Book Rating : 4.3/5 (193 download)

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Book Synopsis Two-Dimensional Transition-Metal Dichalcogenides by : Alexander V. Kolobov

Download or read book Two-Dimensional Transition-Metal Dichalcogenides written by Alexander V. Kolobov and published by Springer. This book was released on 2016-07-26 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.

Two Dimensional Transition Metal Dichalcogenides

Author : Narayanasamy Sabari Arul
Publisher : Springer
ISBN 13 : 9811390452
Total Pages : 355 pages
Book Rating : 4.8/5 (113 download)

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Book Synopsis Two Dimensional Transition Metal Dichalcogenides by : Narayanasamy Sabari Arul

Download or read book Two Dimensional Transition Metal Dichalcogenides written by Narayanasamy Sabari Arul and published by Springer. This book was released on 2019-07-30 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents advanced synthesis techniques adopted to fabricate two-dimensional (2D) transition metal dichalcogenides (TMDs) materials with its enhanced properties towards their utilization in various applications such as, energy storage devices, photovoltaics, electrocatalysis, electronic devices, photocatalysts, sensing and biomedical applications. It provides detailed coverage on everything from the synthesis and properties to the applications and future prospects of research in 2D TMD nanomaterials.

Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy

Author : Yilei Li
Publisher : Springer
ISBN 13 : 331925376X
Total Pages : 80 pages
Book Rating : 4.3/5 (192 download)

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Book Synopsis Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy by : Yilei Li

Download or read book Probing the Response of Two-Dimensional Crystals by Optical Spectroscopy written by Yilei Li and published by Springer. This book was released on 2015-11-09 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the study of the optical response of new atomically thin two-dimensional crystals, principally the family of transition metal dichalcogenides like MoS2. One central theme of the thesis is the precise treatment of the linear and second-order nonlinear optical susceptibilities of atomically thin transition metal dichalcogenides. In addition to their significant scientific interest as fundamental material responses, these studies provide essential knowledge and convenient characterization tools for the application of these 2D materials in opto-electronic devices. Another important theme of the thesis is the valley physics of atomically thin transition metal dichalcogenides. It is shown that the degeneracy in the valley degree of freedom can be lifted and a valley polarization can be created using a magnetic field, which breaks time reversal symmetry in these materials. These findings enhance our basic understanding of the valley electronic states and open up new opportunities for valleytronic applications using two-dimensional materials.

Optical Studies of Two Dimensional Materials

Author : 沈稚強
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (896 download)

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Book Synopsis Optical Studies of Two Dimensional Materials by : 沈稚強

Download or read book Optical Studies of Two Dimensional Materials written by 沈稚強 and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-Dimensional Transition-Metal Dichalcogenides

Author : Chi Sin Tang
Publisher : John Wiley & Sons
ISBN 13 : 3527350640
Total Pages : 357 pages
Book Rating : 4.5/5 (273 download)

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Book Synopsis Two-Dimensional Transition-Metal Dichalcogenides by : Chi Sin Tang

Download or read book Two-Dimensional Transition-Metal Dichalcogenides written by Chi Sin Tang and published by John Wiley & Sons. This book was released on 2023-11-14 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-Dimensional Transition-Metal Dichalcogenides Comprehensive resource covering rapid scientific and technological development of polymorphic two-dimensional transition-metal dichalcogenides (2D-TMDs) over a range of disciplines and applications Two-Dimensional Transition-Metal Dichalcogenides: Phase Engineering and Applications in Electronics and Optoelectronics provides a discussion on the history of phase engineering in 2D-TMDs as well as an in-depth treatment on the structural and electronic properties of 2D-TMDs in their respective polymorphic structures. The text addresses different forms of in-situ synthesis, phase transformation, and characterization methods for 2D-TMD materials and provides a comprehensive treatment of both the theoretical and experimental studies that have been conducted on 2D-TMDs in their respective phases. Two-Dimensional Transition-Metal Dichalcogenides includes further information on: Thermoelectric, fundamental spin-orbit structures, Weyl semi-metallic, and superconductive and related ferromagnetic properties that 2D-TMD materials possess Existing and prospective applications of 2D-TMDs in the field of electronics and optoelectronics as well as clean energy, catalysis, and memristors Magnetism and spin structures of polymorphic 2D-TMDs and further considerations on the challenges confronting the utilization of TMD-based systems Recent progress of mechanical exfoliation and the application in the study of 2D materials and other modern opportunities for progress in the field Two-Dimensional Transition-Metal Dichalcogenides provides in-depth review introducing the electronic properties of two-dimensional transition-metal dichalcogenides with updates to the phase engineering transition strategies and a diverse range of arising applications, making it an essential resource for scientists, chemists, physicists, and engineers across a wide range of disciplines.

Optical Properties of Two-dimensional Transition Metal Dichalcogenides

Author : Yuxuan Lin (S.M.)
Publisher :
ISBN 13 :
Total Pages : 115 pages
Book Rating : 4.:/5 (899 download)

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Book Synopsis Optical Properties of Two-dimensional Transition Metal Dichalcogenides by : Yuxuan Lin (S.M.)

Download or read book Optical Properties of Two-dimensional Transition Metal Dichalcogenides written by Yuxuan Lin (S.M.) and published by . This book was released on 2014 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: The re-discovery of the atomically thin transition metal dichalcogenides (TMDs), which are mostly semiconductors with a wide range of band gaps, has diversified the family of two-dimensional materials and boosted the research on their potential applications in the fields of logic nanoelectronics and high-performance nanophotonics. Many body effects are of great significance in 2-dimensional TMDs, especially when thinned down to a monolayer. As a result, the exciton-related phenomena are prominent in TMD monolayers, which distinguish the monolayers significantly from their bulk counterparts. This thesis systematically studies the optical properties in semiconducting, monolayer TMDs, including Raman spectroscopy, photoluminescence (PL), and optical absorption. In order to further understand the excitononic properties in 2-dimensional TMDs, we took monolayer MoS2 as an example, and studied its exciton behaviors with different carrier densities and dielectric environments through PL measurements with the help of electrochemical gating and non-ionic solvent immersion. Our findings are helpful to understand better the tightly bound excitons in low-dimensional systems and to provide a simple approach to controlling the generation of excitons and trions (charged excitons) selectively and separately.

Defects in Two-Dimensional Materials

Author : Rafik Addou
Publisher : Elsevier
ISBN 13 : 032390310X
Total Pages : 434 pages
Book Rating : 4.3/5 (239 download)

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Book Synopsis Defects in Two-Dimensional Materials by : Rafik Addou

Download or read book Defects in Two-Dimensional Materials written by Rafik Addou and published by Elsevier. This book was released on 2022-02-14 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defects in Two-Dimensional Materials addresses the fundamental physics and chemistry of defects in 2D materials and their effects on physical, electrical and optical properties. The book explores 2D materials such as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides (TMD). This knowledge will enable scientists and engineers to tune 2D materials properties to meet specific application requirements. The book reviews the techniques to characterize 2D material defects and compares the defects present in the various 2D materials (e.g. graphene, h-BN, TMDs, phosphorene, silicene, etc.). As two-dimensional materials research and development is a fast-growing field that could lead to many industrial applications, the primary objective of this book is to review, discuss and present opportunities in controlling defects in these materials to improve device performance in general or use the defects in a controlled way for novel applications. Presents the theory, physics and chemistry of 2D materials Catalogues defects of 2D materials and their impacts on materials properties and performance Reviews methods to characterize, control and engineer defects in 2D materials

Computational Study of Structural and Optical Properties of Two-dimensional Transition-metal Dichalcogenides with Implanted Defects

Download Computational Study of Structural and Optical Properties of Two-dimensional Transition-metal Dichalcogenides with Implanted Defects PDF Online Free

Author : Stefan Rost
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)

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Book Synopsis Computational Study of Structural and Optical Properties of Two-dimensional Transition-metal Dichalcogenides with Implanted Defects by : Stefan Rost

Download or read book Computational Study of Structural and Optical Properties of Two-dimensional Transition-metal Dichalcogenides with Implanted Defects written by Stefan Rost and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

2D Materials for Photonic and Optoelectronic Applications

Author : Qiaoliang Bao
Publisher : Woodhead Publishing
ISBN 13 : 0128154357
Total Pages : 336 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis 2D Materials for Photonic and Optoelectronic Applications by : Qiaoliang Bao

Download or read book 2D Materials for Photonic and Optoelectronic Applications written by Qiaoliang Bao and published by Woodhead Publishing. This book was released on 2019-10-19 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: 2D Materials for Photonic and Optoelectronic Applications introduces readers to two-dimensional materials and their properties (optical, electronic, spin and plasmonic), various methods of synthesis, and possible applications, with a strong focus on novel findings and technological challenges. The two-dimensional materials reviewed include hexagonal boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, black phosphorous and other novel materials. This book will be ideal for students and researchers in materials science, photonics, electronics, nanotechnology and condensed matter physics and chemistry, providing background for both junior investigators and timely reviews for seasoned researchers. Provides an in-depth look at boron nitride, silicene, germanene, topological insulators, transition metal dichalcogenides, and more Reviews key applications for photonics and optoelectronics, including photodetectors, optical signal processing, light-emitting diodes and photovoltaics Addresses key technological challenges for the realization of optoelectronic applications and comments on future solutions

Optical and Electrical Characterization of Two-dimensional Transition Metal Dichalcogenides

Author : 陈曦
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (981 download)

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Book Synopsis Optical and Electrical Characterization of Two-dimensional Transition Metal Dichalcogenides by : 陈曦

Download or read book Optical and Electrical Characterization of Two-dimensional Transition Metal Dichalcogenides written by 陈曦 and published by . This book was released on 2016 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Spectroscopy of Two-Dimensional Transition Metal Dichalcogenides (TMDCs)

Author : Keliang He
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (116 download)

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Book Synopsis Optical Spectroscopy of Two-Dimensional Transition Metal Dichalcogenides (TMDCs) by : Keliang He

Download or read book Optical Spectroscopy of Two-Dimensional Transition Metal Dichalcogenides (TMDCs) written by Keliang He and published by . This book was released on 2014 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atomically thin transition metal dichalcogenides (TMDCs), with the chemical stoichiometry MX2, where M is group VI transition metal atoms including Mo, W; and X is chalcogen atoms of S, Se and Te, have been emerging as a fast growing research field. Similar to graphene, a layered structure with weak van der Waals coupling between neighboring layers allows for them to be easily separated into single to few-layer thick samples. Different from graphene of zero band gap, they exhibit a band gap with magnitude between 1.5 and 2.0 eV and show current on-off ratios exceeding 108 in field-effect transistors. It has been discovered that an indirect to direct band-gap transition occurs in the monolayer limit at the K point of the Brillouin zone, which significantly enhances the photoluminescence quantum yield. Moreover, monolayer TMDCs are non-centrosymmetric arising from A and B sublattices being occupied by M and X atoms, respectively, which makes them an ideal laboratory to study valleytronics. The electronic structure of atomically thin TMDCs, mainly focusing on MoS2 and MoSe2, is investigated with optical absorption, photoluminescence and ultrafast pump-probe spectroscopic techniques in this thesis. First, we demonstrate continuous tuning of the electronic structure of atomically thin MoS2 on flexible substrates by applying a uniaxial tensile strain. A redshift at a rate of ~70 meV per percent applied strain for both mono- and bilayer MoS2 direct gap transitions, and at a rate 1.6 times larger for bilayer MoS2 indirect gap transitions, have been determined.Second, we investigate the optical response of monolayer MoS2 as a function of carrier density. Tightly bound negative trions, a quasi-particle composed of two electrons and a hole, are identified in doped monolayer MoS2. They possess a large binding energy (~ 20 meV), rendering trion effects significant even at room temperature. Third, we demonstrate that optical pumping with circularly polarized light can achieve complete dynamic valley polarization in monolayer MoS2. Moreover, we found that this polarization is retained for longer than 1 ns. Finally, preliminary results on the ultrafast dynamics in mono- and bilayer MoSe2 are presented. The photo-excited carrier dynamics is investigated via optical pump-probe technique.

2D Materials

Author : Phaedon Avouris
Publisher : Cambridge University Press
ISBN 13 : 1316738132
Total Pages : 521 pages
Book Rating : 4.3/5 (167 download)

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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.

Two-Dimensional Materials in Nanophotonics

Author : Yuerui Lu
Publisher : CRC Press
ISBN 13 : 0429767994
Total Pages : 189 pages
Book Rating : 4.4/5 (297 download)

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Book Synopsis Two-Dimensional Materials in Nanophotonics by : Yuerui Lu

Download or read book Two-Dimensional Materials in Nanophotonics written by Yuerui Lu and published by CRC Press. This book was released on 2019-10-31 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-dimensional (2D) materials have attracted tremendous interest since the study of graphene in the early 21st century. With their thickness in the angstrom-to-nanometer range, 2D materials, including graphene, transition metal dichalcogenides, phosphorene, silicene, and other inorganic and organic materials, can be an ideal platform to study fundamental many-body interactions because of reduced screening and can also be further engineered for nanophotonic applications. This book compiles research outcomes of leading groups in the field of 2D materials for nanophotonic physics and devices. It describes research advances of 2D materials for various nanophotonic applications, including ultrafast lasers, atomically thin optical lenses, and gratings to inelastically manipulate light propagation, their integrations with photonic nanostructures, and light–matter interactions. The book focuses on actual applications, while digging into the physics underneath. It targets advanced undergraduate- and graduate-level students of nanotechnology and researchers in nanotechnology, physics, and chemistry, especially those with an interest in 2D materials.

Optical Transitions and Excitonic Effects in Two-dimensional Transition-metal Dichalcogenides

Author : 龔璞
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis Optical Transitions and Excitonic Effects in Two-dimensional Transition-metal Dichalcogenides by : 龔璞

Download or read book Optical Transitions and Excitonic Effects in Two-dimensional Transition-metal Dichalcogenides written by 龔璞 and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Two-Dimensional Semiconductors

Author : Jingbo Li
Publisher : John Wiley & Sons
ISBN 13 : 3527815937
Total Pages : 192 pages
Book Rating : 4.5/5 (278 download)

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Book Synopsis Two-Dimensional Semiconductors by : Jingbo Li

Download or read book Two-Dimensional Semiconductors written by Jingbo Li and published by John Wiley & Sons. This book was released on 2020-03-10 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-depth overview of two-dimensional semiconductors from theoretical studies, properties to emerging applications! Two-dimensional (2D) materials have attracted enormous attention due to their exotic properties deriving from their ultrathin dimensions. 2D materials, such as graphene, transition metal dichalcogenides, transition metal oxides, black phosphorus and boron nitride, exhibit versatile optical, electronic, catalytic and mechanical properties, thus can be used in a wide range of applications, including electronics, optoelectronics and optical applications. Two-Dimensional Semiconductors: Synthesis, Physical Properties and Applications provides an in-depth view of 2D semiconductors from theoretical studies, properties to applications, taking into account the current state of research and development. It introduces various preparation methods and describes in detail the physical properties of 2D semiconductors including 2D alloys and heterostructures. The covered applications include, but are not limited to, field-effect transistors, spintronics, solar cells, photodetectors, light-emitting diode, sensors and bioelectronics. Highly topical: 2D materials are a rapidly advancing field that attracts increasing attention Concise overview: covers theoretical studies, preparation methods, physical properties, potential applications, the challenges and opportunities Application oriented: focuses on 2D semiconductors that can be used in various applications such as field-effect transistors, solar cells, sensors and bioelectronics Highly relevant: newcomers as well as experienced researchers in the field of 2D materials will benefit from this book Two-Dimensional Semiconductors: Synthesis, Physical Properties and Applications is written for materials scientists, semiconductor and solid state physicists, electrical engineers, and readers working in the semiconductor industry.