Author: Markus KotullaPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Confinement Properties of the 3D Topological Insulators Bi2Se3, Bi2Te3, and Sb2Te3
Topological insulators Bi2Se3, Bi2Te3, and Sb2Te3: electronic and topological properties of surfaces and thin films from DFT and GW calculations
Author: Tobias FörsterElectronic Properties of the Topological Insulators Bi2Se3 and Bi2Te3
Author: Robin GühneOptical and electrical properties of topological insulator Bi2Se3
Author: Jiajun ZhuPublisher: diplom.de
ISBN: 3960676603
Category : Science
Languages : en
Pages : 88
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.
Topological Insulators
Author: Publisher: Elsevier
ISBN: 0444633189
Category : Science
Languages : en
Pages : 349
Book Description
Topological Insulators, volume six in the Contemporary Concepts of Condensed Matter Series, describes the recent revolution in condensed matter physics that occurred in our understanding of crystalline solids. The book chronicles the work done worldwide that led to these discoveries and provides the reader with a comprehensive overview of the field. Starting in 2004, theorists began to explore the effect of topology on the physics of band insulators, a field previously considered well understood. However, the inclusion of topology brings key new elements into this old field. Whereas it was thought that all band insulators are essentially equivalent, the new theory predicts two distinct classes of band insulators in two spatial dimensions and 16 classes in three dimensions. These "topological" insulators exhibit a host of unusual physical properties, including topologically protected gapless surface states and exotic electromagnetic response, previously thought impossible in such systems. Within a short time, this new state of quantum matter, topological insulators, has been discovered experimentally both in 2D thin film structures and in 3D crystals and alloys. It appears that topological insulators are quite common in nature, and there are dozens of confirmed substances that exhibit this behavior. Theoretical and experimental studies of these materials are ongoing with the goal of attaining the fundamental understanding and exploiting them in future practical applications. - Usable as a textbook for graduate students and as a reference resource for professionals - Includes the most recent discoveries and visions for future technological applications - All authors are prominent in the field
Electronic Properties of the Topological Insulators Bi2Se3 and Bi2Te3
Author: Robin GühneTopological Insulators at Room Temperature
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
Topological insulators are new states of quantum matter with surface states protected by the time-reversal symmetry. In this work, we perform first-principle electronic structure calculations for Sb2Te3, Sb2Se3, Bi2Te3 and Bi2Se3 crystals. Our calculations predict that Sb2Te3, Bi2T e3 and Bi2Se3 are topological insulators, while Sb2Se3 is not. In particular, Bi2Se3 has a topologically non-trivial energy gap of 0.3eV, suitable for room temperature applications. We present a simple and unified continuum model which captures the salient topological features of this class of materials. These topological insulators have robust surface states consisting of a single Dirac cone at the [Lambda] point.
Brillouin Light Scattering Studies of Topological Insulators Bi2Se3, Sb2Te3, and Bi2Te3
Author: Jamal Najr AlnofiayPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Brillouin Light Scattering has been used to examine acoustic waves in three different Topological Insulators: Bismuth Selenide Bi2Se3, Antimony Telluride Sb2Te3, and Bismuth Telluride Bi2Te3. Two samples of each material were studied to ensure the accuracy of the results obtained. In general, surface mode, quasi-transverse, and quasi-longitudinal bulk modes were observed in all these materials. Rayleigh surface phonon velocities were obtained for the first time from the corresponding Brillouin peak frequency shifts. Quasi-transverse and quasi-longitudinal bulk mode velocities were also obtained. Elastic constants C33 and C44 were calculated from the measured bulk-velocities. Both bulk acoustic phonon velocities and elastic constants were compared to those obtained in previous studies. All results obtained have been found to be in good agreement with both experimental and some theoretical available studies.
Photoconductivity
Author: N V JoshiPublisher: Routledge
ISBN: 1351424874
Category : Technology & Engineering
Languages : en
Pages : 330
Book Description
Featuring detector technology capable of sensing even a few photons, this valuablereference guide provides criteria for selecting techniques and equipment appropriate tovarious types of faint signals. It highlights many important facets of photoconductivityand photodetection, including the measurement of weak photosignals in the presence ofnoise ... statistics relating to the creation, annihilation, and transport of charge carriers... and time-dependent behavior, photoquenching, negative photoconductivity, andphotosensitivity.Complete with more than 125 diagrams and tables, Photoconductivity: Art,Science, and Technology gives special attention to modem two-dimensionalphotodetectors . . . describes various configurations for experimental techniques inphotoconductivity measurements . . . surveys band structure properties, with usefulreference to such contemporary structures as n-i-p-i and modulation doped materials .. .illustrates the concept of noise in photoconductors and its role in detector technology .. .and observes unusual photoconducting properties in diluted magnetic semiconductors.Photoconductivity: Art, Science, and Technology serves as an indispensableresource for optical, electrical, laser, and aerospace engineers, physicists, materialsscientists, photonic scientists, and graduate students interested in these disciplines.
The Role of Topology in Materials
Author: Sanju GuptaPublisher:
ISBN: 9783319765976
Category : Materials science
Languages : en
Pages : 297
Book Description
This book presents the most important advances in the class of topological materials and discusses the topological characterization, modeling and metrology of materials. Further, it addresses currently emerging characterization techniques such as optical and acoustic, vibrational spectroscopy (Brillouin, infrared, Raman), electronic, magnetic, fluorescence correlation imaging, laser lithography, small angle X-ray and neutron scattering and other techniques, including site-selective nanoprobes. The book analyzes the topological aspects to identify and quantify these effects in terms of topology metrics. The topological materials are ubiquitous and range from (i) de novo nanoscale allotropes of carbons in various forms such as nanotubes, nanorings, nanohorns, nanowalls, peapods, graphene, etc. to (ii) metallo-organic frameworks, (iii) helical gold nanotubes, (iv) Möbius conjugated polymers, (v) block co-polymers, (vi) supramolecular assemblies, to (vii) a variety of biological and soft-matter systems, e.g. foams and cellular materials, vesicles of different shapes and genera, biomimetic membranes, and filaments, (viii) topological insulators and topological superconductors, (ix) a variety of Dirac materials including Dirac and Weyl semimetals, as well as (x) knots and network structures. Topological databases and algorithms to model such materials have been also established in this book. In order to understand and properly characterize these important emergent materials, it is necessary to go far beyond the traditional paradigm of microscopic structure-property-function relationships to a paradigm that explicitly incorporates topological aspects from the outset to characterize and/or predict the physical properties and currently untapped functionalities of these advanced materials. Simulation and modeling tools including quantum chemistry, molecular dynamics, 3D visualization and tomography are also indispensable. These concepts have found applications in condensed matter physics, materials science and engineering, physical chemistry and biophysics, and the various topics covered in the book have potential applications in connection with novel synthesis techniques, sensing and catalysis. As such, the book offers a unique resource for graduate students and researchers alike.