Optical and electrical properties of topological insulator Bi2Se3 PDF Download

Author: Jiajun Zhu
Publisher: diplom.de
ISBN: 3960676603
Category : Science
Languages : en
Pages : 88

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Book Description
Topological insulator is one of the hottest research topics in solid state physics. This is the first book to describe the vibrational spectroscopies and electrical transport of topological insulator Bi2Se3, one of the most exciting areas of research in condensed matter physics. In particular, attempts have been made to summarize and develop the various theories and new experimental techniques developed over years from the studies of Raman scattering, infrared spectroscopy and electrical transport of topological insulator Bi2Se3. It is intended for material and physics researchers and graduate students doing research in the field of optical and electrical properties of topological insulators, providing them the physical understanding and mathematical tools needed to engage research in this quickly growing field. Some key topics in the emerging field of topological insulators are introduced.

Author: Alain Diebold
Publisher: Springer Nature
ISBN: 3030803236
Category : Technology & Engineering
Languages : en
Pages : 495

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Book Description
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.

Author: Inamuddin
Publisher: Materials Research Forum LLC
ISBN: 1644902850
Category : Technology & Engineering
Languages : en
Pages : 195

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Book Description
A topological insulator is an area that has yet to be fully explored and developed. The charge-induced bandgap fluctuation in the best-known bismuth-chalcogenide-based topological insulators is approximately 10MeV in magnitude. The major focus has shifted to the investigation of the presence of high-symmetry electronic bands as well as the utilization of easily produced materials. As the subject of topological insulators is still in the nascent stage, there is growing research and knowledge in the emerging field. This book is intended to provide the readers with an understanding of the needs and application of these materials. Keywords: Topological Insulators, Insulators, One-Dimensional Topological Insulators, Graphene, Magnetic Topological Insulator, Antiferromagnetic Phase, Ferromagnetic Phase, Topological Superconductor, Nonlinear Optical Behavior, Saturable Absorber, Quantum, Band Gap, Photonic Topological Insulators.

Author: Michael Scott Wolf
Publisher:
ISBN:
Category : Antimony compounds
Languages : en
Pages : 58

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Book Description
Topological insulators are currently a main focus of condensed matter research. They have a unique property in which the bulk of the material acts as an insulator, while the surface states display metallic behavior. Using infrared, optical and magneto-optical spectroscopy, we have studied 3D topological insulators Bi2Se3, Bi2Te3, Sb2Te3 to understand their optical properties. The measurements were carried out using a Fourier Transform Infrared Spectrometer (FTIR) and an ultraviolet-visible spectrometer at varying temperatures ranging from 5 Kelvin to 300 Kelvin and at varying magnetic fields up to 18 Tesla. We use the Drude-Lorentz model to replicate the experimental data of the samples allowing to gain an understanding of the physical phenomena happening in the infrared, visible and ultraviolet regions of radiation. This understanding gives us insight on the optical properties of the materials such as charge dynamics. Results show that the temperature and magnetic field have an effect on the charge carriers especially near the plasma frequency.

Author: Zishan H. Khan
Publisher: Springer Nature
ISBN: 9811905533
Category : Technology & Engineering
Languages : en
Pages : 608

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Book Description
This book covers the latest research on applications of nanomaterials in the field of energy systems and devices. It provides an overview of the state-of-art research in this rapidly developing field. It discusses the design and fabrication of nanostructured materials and their energy applications. Various topics covered include nanomaterials for perovskite solar cells, transition metal dichalcogenides (TMDs) nanocomposites based supercapacitors, battery materials and technologies, major challenges toward development of efficient thermoelectric materials for energy efficient devices, extraction and experimentation of biodiesel produced from leachate oils of landfills coupled with nano-additives aluminium oxide and copper oxide on diesel engine and many more. It has contributions from world-renowned specialists in the fields of nanomaterials and energy devices. The book will be useful for students, researchers and professionals working in the area of nanomaterials and energy systems & devices.

Author: Jonathan A. Sobota
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Most macroscopic properties of a material (electrical, thermal, and optical) can be understood on the basis of its band structure and the dynamical behavior of its electrons. However, resolving electron dynamics directly is difficult using conventional techniques because the underlying interactions typically occur on a femtosecond timescale. Ultrafast photoemission spectroscopy is an experimental technique which can probe electronic band structure with femtosecond time resolution. This dissertation presents work using this technique to study dynamic phenomena in the topological insulator Bi2Se3, a fascinating material due to the coexistence of its insulating bulk and metallic surface electronic structures. It will demonstrate three types of novel measurements that can be performed with ultrafast photoemission spectroscopy which are unattainable by other methods: (1) By performing two-photon photoemission (2PPE) spectroscopy, it is possible to resolve unoccupied band structure above the Fermi level. In Bi2Se3 this reveals a second, topologically protected surface state. (2) Time-resolved 2PPE (tr2PPE) is used to record real-time "movies" of the electron relaxation which follows optical excitation. This allows for the identification of intra- and inter- band electron scattering pathways in the material. Temperature-dependent tr2PPE measurements are performed on the conduction band to help understand the role of electron-phonon coupling. A model of fundamental electron-phonon scattering processes is implemented to describe the results. (3) In a time- and angle- resolved photoemission spectroscopy (trARPES) experiment, intense optical excitation is used to drive coherent motion of A1g optical phonon modes in Bi2Se3. These modes lead to periodic binding energy shifts in the bulk conduction band and surface state. A slight red-shift of the phonon frequency is observed in the surface state, which is used to deduce a softening of the phonon due to the abrupt termination of the crystal at its surface.

Author: Paola Di Pietro
Publisher: Springer Science & Business Media
ISBN: 3319019910
Category : Technology & Engineering
Languages : en
Pages : 129

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Book Description
Topological Insulators (TIs) are insulators in the bulk, but have exotic metallic states at their surfaces. The topology, associated with the electronic wavefunctions of these systems, changes when passing from the bulk to the surface. This work studies, by means of infrared spectroscopy, the low energy optical conductivity of Bismuth based TIs in order to identify the extrinsic charge contribution of the bulk and to separate it from the intrinsic contribution of the surface state carriers. The extensive results presented in this thesis definitely shows the 2D character of the carriers in Bismuth-based topological insulators. The experimental apparatus and the FTIR technique, the theory of optical properties and Surface Plasmon Polaritons, as well as sample preparation of both crystals and thin films, and the analysis procedures are thoroughly described.

Author: Peng Yu
Publisher: Springer Nature
ISBN: 303087544X
Category : Science
Languages : en
Pages : 348

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Book Description
This book highlights cutting-edge research in surface plasmons, discussing the different types and providing a comprehensive overview of their applications. Surface plasmons (SPs) receive special attention in nanoscience and nanotechnology due to their unique optical, electrical, magnetic, and catalytic properties when operating at the nanoscale. The excitation of SPs in metal nanostructures enables the manipulation of light beyond the diffraction limit, which can be utilized for enhancing and tailoring light-matter interactions and developing ultra-compact high-performance nanophotonic devices for various applications. With clear and understandable illustrations, tables, and descriptions, this book provides physicists, materials scientists, chemists, engineers, and their students with a fundamental understanding of surface plasmons and device applications as a basis for future developments.

Author: Huixia Luo
Publisher: John Wiley & Sons
ISBN: 111940732X
Category : Technology & Engineering
Languages : en
Pages : 420

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Book Description
This book is the first pedagogical synthesis of the field of topological insulators and superconductors, one of the most exciting areas of research in condensed matter physics. Presenting the latest developments, while providing all the calculations necessary for a self-contained and complete description of the discipline, it is ideal for researchers and graduate students preparing to work in this area, and it will be an essential reference both within and outside the classroom. The book begins with the fundamental description on the topological phases of matter such as one, two- and three-dimensional topological insulators, and methods and tools for topological material's investigations, topological insulators for advanced optoelectronic devices, topological superconductors, saturable absorber and in plasmonic devices. Advanced Topological Insulators provides researchers and graduate students with the physical understanding and mathematical tools needed to embark on research in this rapidly evolving field.

Author: Robin Gühne
Publisher:
ISBN:
Category :
Languages : en
Pages :

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