Download or read book Magneto optical Studies of Dirac and Weyl Semimetals written by Seongphill Moon and published by . This book was released on 2021 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studying of relativistic particles in the condensed matter system became possible after adiscovery of graphene in 2004. What follows from graphene was search for other materials hosting relativistic particles, such as Dirac semimetals and Weyl semimetals. Low energy fermionic excitations of such materials show linear energy-momentum dispersion relationship, which can be described by the Dirac and Weyl Hamiltonians. In this dissertation, we utilize low temperature magneto-infrared spectroscopy to obtain detailed understanding of band dispersion of the Dirac and Weyl semimetals. Low energy electronic band structures of Weyl semimetals consist of two non-degenerated linear bands with crossing points, which is called Weyl bands. Weyl semimetals can be categorized into type-I and type-II depending on degree of tilting of the Weyl bands. In the first part of this dissertation, we present magneto-optical spectroscopy experiment on a archetypical type-I Weyl semimetal, NbP. We observed a complicated structure of inter-Landau level transitions, which only can be satisfactorily explained by a newly proposed Weyl Hamiltonian model, which includes tilting effect. Our work demonstrates that Weyl band of NbP is strongly tilted from ideal type-I case and a theoretical model with effect of tilting can give accurate information of Weyl band structures. A zinc-blende crystal of HgCdTe has been known to have highly tunable band structure as a function of cadmium content and temperature. At optimal concentration and temperature, band structure is predicted to show linear band dispersion. Band structures of HgCdTe have been successfully described by Kane model, thus, quasiparicles in the system are called Kane fermions. Here, in the second part of the thesis, we study chemical composition and temperature dependent band structure evolution of Hg1-xCdxTe through magneto-optical spectroscopy. Our observation proves that the Kane fermions in HgCdTe become true massless quasiparticles at a specific condition.
Download or read book Optical Studies on Dirac and Weyl Semimetals written by Micha Benjamin Schilling and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electronic Properties Of Dirac And Weyl Semimetals written by Eduard V Gorbar and published by World Scientific. This book was released on 2021-01-04 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: The monograph reviews various aspects of electronic properties of Dirac and Weyl semimetals. After a brief discussion of 2D Dirac semimetals, a comprehensive review of 3D materials is given. The description starts from an overview of the topological properties and symmetries of Dirac and Weyl semimetals. In addition, several low-energy models of Dirac and Weyl quasiparticles are presented. The key ab initio approaches and material realizations are given. The monograph includes detailed discussions of the surface Fermi arcs, anomalous transport properties, and collective modes of Dirac and Weyl semimetals. Superconductivity in these materials is briefly addressed.
Download or read book Linear Electrodynamic Response of Topological Semimetals written by Artem V. Pronin and published by Springer Nature. This book was released on 2023-08-17 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a model description for the electromagnetic response of topological nodal semimetals and summarizes recent experimental findings in these systems. Specifically, it discusses various types of topological semimetals – Dirac, Weyl, nodal-line, triple-point, and multifold semimetals – and provides description for the characteristic features of the linear electrodynamic response for all these types of materials. Topological semimetals possess peculiar bulk electronic band structure, which leads to unusual electrodynamic response. For example, the low-energy inter-band optical conductivity of nodal semimetals is supposed to demonstrate power-law frequency dependence and the intra- and inter-band contributions to the conductivity are often mixed. Further, the magneto-optical response is also unusual, because of the non-equidistant spacing between the Landau levels. Finally, in semimetals with chiral electronic bands, e.g. in Weyl semimetals, the simultaneous application of parallel magnetic and electric fields leads to the chiral anomaly, i.e. to a misbalance between the electrons with diffident chiralities. This misbalance affects the electrodynamics properties of the material and can be detected optically. All these points are addressed here in detail. The book is written for a wide audience of physicists, working in the field of topological condensed matter physics. It gives a pedagogical introduction enabling graduate students and non-experts to familiarize themselves with the subject.
Download or read book Theoretical Aspects and New Developments in Magneto Optics written by J.T. Devreese and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advanced Study Institute on "Theoretical Aspects and New Developments in Magneto-Optics" was held at the University of Antwerpen (R.U.C.A.), from July 16 to July 28, 1979. The Institute was sponsored by NATO. Co-sponsors were: Agfa-Gevaert (Belgium), A.S.L.K. (Belgium), Bell Telephone Mfg. CO. (Belgium), Esso Belgium, Generale Bankmaatschappij (Belgium), General Motors (Belgium), I.B.M. (Belgium), Kredietbank (Belgium), Metallurgie Hoboken-Over pelt (Belgium), National Science Foundation (U.S.A). A total of 60 lecturers and participants attended the Institute. Scope of the Institute The magneto-optic phenomena are due to the change of the polarizability of a substance as a result of the splitting of the quantized energy bands. Most of these phenomena were discovered during the second half of this century. The understanding of the magneto-optical effects of all kinds, however, was brought by the advent of quantum mechanics, and since then important progress has been made in many fields of experimental methods and techniques.
Download or read book Magneto optical Studies of the CaO F Band written by William Merle Ziniker and published by . This book was released on 1967 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magneto optical Studies of Single Semiconductor Quantum Dots in Microcavity written by Shlomi Alon-Braitbart and published by . This book was released on 2005 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Springer Handbook of Surface Science written by Mario Rocca and published by Springer Nature. This book was released on 2021-01-14 with total page 1273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook delivers an up-to-date, comprehensive and authoritative coverage of the broad field of surface science, encompassing a range of important materials such metals, semiconductors, insulators, ultrathin films and supported nanoobjects. Over 100 experts from all branches of experiment and theory review in 39 chapters all major aspects of solid-state surfaces, from basic principles to applications, including the latest, ground-breaking research results. Beginning with the fundamental background of kinetics and thermodynamics at surfaces, the handbook leads the reader through the basics of crystallographic structures and electronic properties, to the advanced topics at the forefront of current research. These include but are not limited to novel applications in nanoelectronics, nanomechanical devices, plasmonics, carbon films, catalysis, and biology. The handbook is an ideal reference guide and instructional aid for a wide range of physicists, chemists, materials scientists and engineers active throughout academic and industrial research.
Download or read book Magneto optical Studies of InGaAs Quantum Wells and Devices Used for Spintronics Applications written by Tariq Ali and published by . This book was released on 2011 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: AbstractSpintronics has been one of the most rapidly developing research areas in condensed matter physics. Exploiting the electron's spin degree of freedom is hoped to yield new and novel technological applications. The ability to generate a non-equilibrium spin population, to manipulate the spins, and to be able to detect them have been the most intensely studied subjects in this research area. In this dissertation, spin injection from an Fe (Iron) ferromagnetic spin polarizing contact into two dimensional semiconductor hetero-structures were investigated using a device called a "Spin-LED" also known as a Spin Light Emitting Diode. Due to its high Curie temperature, Fe is a very promising candidate for practical applications at room temperature. This dissertation is comprised of two separate experimental studies outlined as follows.1. We have investigated the Polarization of the Spin LEDs as function of Bias. In addition to the exciton we see a feature called "LV" (Low Voltage) that is bias and temperature dependent. We have compared the Spin life time TS measured for the exciton, LV feature in the device (Spin LED) and for the exciton in the unprocessed InGaAs QW. The LV feature shows polarization in excess of 70% and the polarization changes sign as we increase the magnetic field from B = 0 Tesla to B = 7 Tesla.2. We see intensity oscillations in for the photoluminescence for exciton in the InGaAs QWs. We attribute these oscillations to the Optical Aharonov-Bohm effect. A shift in the oscillations has been observed when the sample relative angle with respect to the magnetic field is changed. These oscillations are present only in the Faraday's geometry and disappear in the Voigt geometry.
Download or read book Topological Insulators written by Shun-Qing Shen and published by Springer Science & Business Media. This book was released on 2013-01-11 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topological insulators are insulating in the bulk, but process metallic states present around its boundary owing to the topological origin of the band structure. The metallic edge or surface states are immune to weak disorder or impurities, and robust against the deformation of the system geometry. This book, the first of its kind on topological insulators, presents a unified description of topological insulators from one to three dimensions based on the modified Dirac equation. A series of solutions of the bound states near the boundary are derived, and the existing conditions of these solutions are described. Topological invariants and their applications to a variety of systems from one-dimensional polyacetalene, to two-dimensional quantum spin Hall effect and p-wave superconductors, and three-dimensional topological insulators and superconductors or superfluids are introduced, helping readers to better understand this fascinating new field. This book is intended for researchers and graduate students working in the field of topological insulators and related areas. Shun-Qing Shen is a Professor at the Department of Physics, the University of Hong Kong, China.
Download or read book Topological Matter written by Dario Bercioux and published by Springer. This book was released on 2018-10-03 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers basic and advanced aspects in the field of Topological Matter. The chapters are based on the lectures presented during the Topological Matter School 2017. It provides graduate level content introducing the basic concepts of the field, including an introductory session on group theory and topological classification of matter. Different topological phases such as Weyls semi-metals, Majoranas fermions and topological superconductivity are also covered. A review chapter on the major experimental achievements in the field is also provided. The book is suitable not only for master, graduate and young postdoctoral researchers, but also to senior scientists who want to acquaint themselves with the subject.
Download or read book Magneto optical and linear polarization studies of metalloporph written by Elisabeth Cornelia Maria Keilman-van Luijt and published by . This book was released on 19?? with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magneto optical Studies of Exciton Effects in Layer type Semiconductors written by Kiyoshi Aoyagi and published by . This book was released on 1966 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magneto optical Studies of 2D 1D and 0D Electron Systems written by Sailesh Patel and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Topological Photonics written by Xiaoyong Hu and published by Frontiers Media SA. This book was released on 2022-07-07 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Topological Semimetals written by David J. Fisher and published by Materials Research Forum LLC. This book was released on 2019-04-20 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topological semimetals are quantum materials that are not only extremely interesting from a theoretical point of view but also have a great potential for technological applications in which superconducting, semiconducting and other semimetal behaviors are involved. Keywords: Quantum Materials, Macroscopic Quantum Phenomena, Topological Semimetals, Dirac Semimetals, Weyl Semimetals, Nodal-Line Semimetals, Antimony and Antimonides, Antimonene, Arsenides, Bismuthides, Boron, Borides, Borophene, Carbon and Carbides, Chalcogenides, Nitrides, Phosphorus, Phosphides, Silicides, Topological Metals, Topological States of Matter.
