Binary And Rare Earth Doped Topological Insulator Thin Films
DOWNLOAD
Download Binary And Rare Earth Doped Topological Insulator Thin Films PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Binary And Rare Earth Doped Topological Insulator Thin Films book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Binary And Rare Earth Doped Topological Insulator Thin Films
DOWNLOAD
Author : Sara Elizabeth Harrison
language : en
Publisher:
Release Date : 2015
Binary And Rare Earth Doped Topological Insulator Thin Films written by Sara Elizabeth Harrison and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Topological insulators (TIs) are a newly discovered class of electronic materials which are characterized by an insulating bulk band gap and metallic conducting edge/surface states. Their novel electronic band structure arises from strong spin-orbit coupling that leads to bulk energy band inversion which necessitates the formation of metallic states at their physical boundaries with dissimilar materials. These metallic edge/surface states have intriguing spin-momentum locking properties and a very robust nature, due to scattering protection by time-reversal symmetry (TRS), which make them interesting from both a fundamental science perspective as well as for their potential use in future generation electronic and spintronic applications. Recently, the discovery of the three-dimensional (3D) TIs in the bismuth telluride family of materials has provided an exciting new direction for TI research. The surface states on these 3D TIs are detectable at room temperature which eases the harsh requirements previously needed to study TIs and increases their potential for use in practical applications. As commercially successful thermoelectric materials, the use of widely accessible bulk crystals of the bismuth telluride family of 3D TIs has enabled early studies of their topological surface states. However, a prerequisite for realizing many proposed TI applications is the synthesis of high crystalline quality thin films which necessitates efforts in thin film materials engineering. In addition, a new area of TI materials research has also recently emerged around breaking the TRS in 3D TIs by inducing ferromagnetism through magnetic doping. This approach is predicted to provide a promising route for realizing exotic physical states, such as the recently discovered quantum anomalous Hall state. However, exploring magnetically induced phenomena has been experimentally challenging which has prompted the search for alternative TI systems through fundamental magnetic doping studies. This dissertation focuses on the growth and characterization of binary and rare earth-doped bismuth telluride thin films. All samples were fabricated using molecular beam epitaxy (MBE) and their structural, electronic, and magnetic properties were characterized using a comprehensive set of surface- and bulk-sensitive analytical techniques. The development of a new two-temperature step MBE growth process for bismuth telluride thin films is presented. The two-step method is shown to yield films of high crystallinity with significantly improved material properties over films grown using other growth recipes. This growth technique served as the starting platform for other studies presented in this work, including investigations into surface preparation techniques for ex situ grown TI thin films and magnetic doping studies with rare earth elements. Major shortcomings of conventional preparation techniques for preserving or restoring the surface of air exposed TI films are also presented. Commonly employed sputter cleaning is shown to be incompatible with TI samples that are prone to severe oxidation such as magnetically doped TIs. Se- and Te-capping layer studies provide new evidence that this commonly employed technique is ineffective at preserving the as-grown properties of bismuth telluride thin films. Alternatively, the efficacy of in situ cleaving for preparation of clean binary and rare earth-doped TI surfaces is demonstrated. Finally, the first experimental work on MBE-grown Dy-doped bismuth telluride thin films is presented. X-ray studies reveal that large concentrations of Dy, ranging from 0% to 35.5% (in % of the Bi sites), can be incorporated into the host bismuth telluride crystal lattice without the formation of secondary phases. A subset of films in the doping series are shown to maintain a high degree of crystallinity with evidence for substitutional doping of Dy and the absence of intercalation in the van der Waals gaps. Electronic band structure measurements show that there is a critical Dy doping concentration above which evidence for a sizable gap (tens of meV) in the surface state is detected. Bulk magnetometry reveals paramagnetic behavior down to low temperatures for all samples in the doping series. The use of rare earth dopants introduces the highest magnetic moments into a TI system, which could have a transformative potential for TI-based applications in the future.
Topological Insulator And Magnetically Doped Topological Insulator Thin Films By Molecular Beam Epitaxy
DOWNLOAD
Author : Shuang Li
language : en
Publisher:
Release Date : 2013
Topological Insulator And Magnetically Doped Topological Insulator Thin Films By Molecular Beam Epitaxy written by Shuang Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Searching for energy dissipation-less systems has become increasingly important for low power electronic devices. Topological insulators, a new topological state of quantum matter, have recently been proposed as an emerging material for use in low power electronics, because of the unique transport along its topologically protected edge/surface states. In addition, it has been predicted that the incorporation of magnetic elements into topological insulators could lead to the quantum anomalous Hall state, which is a truly dissipation-less system. However, the material quality of topological insulator thin films remains as a major stumbling block for exploring the novel physics of topological insulators and their proposed applications. In the first part of this thesis, I will first describe an advanced thin film deposition technique, molecular beam epitaxy (MBE) and the mini-MBE system we designed and built for topological insulator thin film growth. Then I will briefly illustrate some basic principles and sample preparation methods for a variety of characterization techniques we used for the material property investigation. In the second part of this thesis, I will present the growth and characterization of topological insulator bismuth telluride thin films grown by a two-step MBE process developed as part of this research. By optimizing the growth recipe and particularly developing the two-step growth method, defect densities were significantly reduced and higher crystal and surface quality bismuth telluride thin films were achieved. The existence of a topological surface state on our bismuth telluride thin films was also confirmed. The Fermi level of our bismuth telluride thin film was tuned to very close to the bulk gap region. The successful growth of centimeter-sized, uniform, high quality topological insulator thin films provides an excellent platform for both fundamental studies of the properties of topological insulators and fabrications of mesoscopic devices. Finally, I will report on the first successful growth of gadolinium substituted bismuth telluride thin films with high Gd concentrations by MBE. We systematically investigated the crystal structure, band structure, magnetic, and electronic properties of gadolinium substituted bismuth telluride thin films. The topological surface state was found to remain intact by Gd substitution into bismuth telluride. Although ferromagnetic behavior in gadolinium substituted bismuth telluride thin films was not observed above 2K by both magnetic and magneto-transport measurements, gadolinium substituted bismuth telluride thin films were found to have a Curie susceptibility due to the paramagnetic Gd ions with an atomic magnetic moment of 6.93 Bohr magneton per Gd ion, which suggests that it is possible to realize dissipation-less transport with a small external magnetic field or with a ferromagnetic layer on top of gadolinium substituted bismuth telluride thin films.
Transition Metal Doped Bi2se3 And Bi2te3 Topological Insulator Thin Films
DOWNLOAD
Author : Liam James Collins-McIntyre
language : en
Publisher:
Release Date : 2015
Transition Metal Doped Bi2se3 And Bi2te3 Topological Insulator Thin Films written by Liam James Collins-McIntyre and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Rare Earth Oxide Thin Films From Solution Based Inorganic Precursor Deposition As Potential Candidates For Insulators In Advanced Gate Stacks
DOWNLOAD
Author : Maraike Ahlf
language : en
Publisher:
Release Date : 2012
Rare Earth Oxide Thin Films From Solution Based Inorganic Precursor Deposition As Potential Candidates For Insulators In Advanced Gate Stacks written by Maraike Ahlf and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Computational Quantum Physics And Chemistry Of Nanomaterials
DOWNLOAD
Author : Mojmír Šob
language : en
Publisher: MDPI
Release Date : 2021-04-01
Computational Quantum Physics And Chemistry Of Nanomaterials written by Mojmír Šob and has been published by MDPI this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-01 with Science categories.
This Special Issue of Nanomaterials collects a series of original research articles providing new insight into the application of computational quantum physics and chemistry in research on nanomaterials. It illustrates the extension and diversity of the field and indicates some future directions. It provides the reader with an overall view of the latest prospects in this fast evolving and cross-disciplinary field
Topological Insulators
DOWNLOAD
Author : Frank Ortmann
language : en
Publisher: John Wiley & Sons
Release Date : 2015-04-07
Topological Insulators written by Frank Ortmann and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-04-07 with Technology & Engineering categories.
There are only few discoveries and new technologies in physical sciences that have the potential to dramatically alter and revolutionize our electronic world. Topological insulators are one of them. The present book for the first time provides a full overview and in-depth knowledge about this hot topic in materials science and condensed matter physics. Techniques such as angle-resolved photoemission spectrometry (ARPES), advanced solid-state Nuclear Magnetic Resonance (NMR) or scanning-tunnel microscopy (STM) together with key principles of topological insulators such as spin-locked electronic states, the Dirac point, quantum Hall effects and Majorana fermions are illuminated in individual chapters and are described in a clear and logical form. Written by an international team of experts, many of them directly involved in the very first discovery of topological insulators, the book provides the readers with the knowledge they need to understand the electronic behavior of these unique materials. Being more than a reference work, this book is essential for newcomers and advanced researchers working in the field of topological insulators.
Magnetic Heterostructures
DOWNLOAD
Author : H. Zabel
language : en
Publisher: Springer
Release Date : 2007-10-26
Magnetic Heterostructures written by H. Zabel and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-10-26 with Science categories.
Heterostructures consist of combinations of different materials, which are in contact through at least one interface. Magnetic heterostructures combine different physical properties which do not exist in nature. This book provides the first comprehensive overview of an exciting and fast developing field of research, which has already resulted in numerous applications and is the basis for future spintronic devices.
Chalcogenides
DOWNLOAD
Author : Alexander V. Kolobov
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-08-22
Chalcogenides written by Alexander V. Kolobov and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-22 with Technology & Engineering categories.
A state-of-the-art description of metastability observed in chalcogenide alloys is presented with the accent on the underlying physics. A comparison is made between sulphur(selenium)-based chalcogenide glasses, where numerous photo-induced phenomena take place entirely within the amorphous phase, and tellurides where a reversible crystal-to-amorphous phase-change transformation is a major effect. Applications of metastability in devices¿optical memories and nonvolatile electronic phase-change random-access memories among others are discussed, including the latest trends. Background material essential for understanding current research in the field is also provided.
Inorganic And Organic Thin Films
DOWNLOAD
Author : Yu Song
language : en
Publisher: John Wiley & Sons
Release Date : 2021-07-19
Inorganic And Organic Thin Films written by Yu Song and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-07-19 with Technology & Engineering categories.
Learn more about foundational and advanced topics in polymer thin films and coatings besides species with this powerful two-volume resource The two-volume Inorganic and Organic Thin Films: Fundamentals, Fabrication, and Applications delivers a foundational resource for current researchers and commercial users involved in the design and fabrication of thin films. The book offers newcomers to the field a thorough description of new design theory, fabrication methods, and applications of advanced thin films. Readers will discover the physics and chemistry underlying the manufacture of new thin films and coatings in this leading new resource that promises to become a handbook for future applications of the technology. This one-stop reference brings together all important aspects of inorganic and polymeric thin films and coatings, including construction, assembly, deposition, functionality, patterning, and characterization. Explorations of their applications in industries as diverse as information technology, new energy, biomedical engineering, aerospace, and oceanographic engineering round out this fulsome exploration of one of the most exciting and rapidly developing areas of scientific and industrial research today. Readers will also learn from: A comprehensive introduction to the progress of thin films and coatings as well as fundamentals in functional thin films and coatings An exploration of multi-layered magnetic thin films for electron transport control and signal sensing, including giant magnetoresistance, colossal magnetoresistance, tunneling magnetoresistance, and the quantum anomalous Holzer effect An in time summary of high-quality magneto-optics, nanophotonics, spin waves and spintronics using bismuth-substituted iron garnet thin films as examples A thorough discussion of template-assisted fabrication of nanostructure thin films for ultrasensitive detection of chemicals and biomolecules A treatment of biomass derived functional films and coatings Perfect for materials scientists and inorganic chemists, Inorganic and Organic Thin Films will also earn a place in the libraries of solid state physicists and physical chemists working in private industry, as well as polymer and surface chemists who seek to improve their understanding of thin films and coatings.
Springer Handbook Of Surface Science
DOWNLOAD
Author : Mario Rocca
language : en
Publisher: Springer Nature
Release Date : 2021-01-14
Springer Handbook Of Surface Science written by Mario Rocca and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-01-14 with Science categories.
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.