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Author : Joseph H. Kratzer
Publisher :
ISBN 13 : 9780542106767
Total Pages : 98 pages
Book Rating : 4.1/5 (67 download)
Download or read book Magneto-optic Properties of II-VI Semiconductor Quantum Dots written by Joseph H. Kratzer and published by . This book was released on 2005 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Pamela Rueda-Fonseca
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (918 download)
Download or read book Magnetic Quantum Dots in II-VI Semiconductor Nanowires written by Pamela Rueda-Fonseca and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this PhD work a novel type of magnetic semiconductor object has been developed: Cd(Mn)Te quantum dots embedded in ZnTe/ZnMgTe core-shell nanowires. The goal was to investigate the growth, by molecular beam epitaxy, and the fundamental properties of these complex heterostructures. For that purpose, two main issues were addressed: i) gaining control of the structural, electronic and magnetic properties of these quantum objects by mastering their growth; and ii) obtaining quantitative local knowledge on the chemical composition of those non-homogeneous nanostructures. To tackle these topics, our research was divided into four stages. The first stage was devoted to perform a quantitative study of the formation process of the Au particles that catalyze the growth of nanowires. The second stage involved the analysis of the mechanisms and parameters governing the growth of ZnTe nanowires. In particular, two different types of nanowires were found: cone-shaped nanowires with the zinc-blende crystal structure and cylinder-shaped nanowires with the hexagonal wurtzite structure. A diffusion-driven growth model is employed to fit some of the quantitative results presented in this part. The third stage focused on the insertion of pure CdTe quantum dots containing Mn ions in the core-shell nanowires. An initial study of the relevant parameters influencing the magneto-optical properties of these objects, such as the quantum dot confinement, the Mn incorporation, and the strain anisotropy, was performed. The four and last stage of this work concerned the quantitative interpretation of Energy-Dispersive X-ray spectroscopy measurements performed on single core-multishell nanowires. A geometrical model was proposed to retrieve the shape, the size and the local composition of the quantum dot insertions and of the multiple layers of the heterostructures. This study was coupled to other complementary characterization measurements on the same nanowire, such as cathodo-luminescence, micro-photo-luminescence and magneto-optical spectroscopy.
Author : Huijuan Zhou
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (764 download)
Download or read book Optical and Magnetic Resonance Properties of II-VI Quantum Dots written by Huijuan Zhou and published by . This book was released on 2002 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. R. Vij
Publisher : Nova Publishers
ISBN 13 : 9781560724339
Total Pages : 406 pages
Book Rating : 4.7/5 (243 download)
Download or read book Luminescence and Related Properties of II-VI Semiconductors written by D. R. Vij and published by Nova Publishers. This book was released on 1998 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume provides the readers an in-depth, yet concise, overview of the physico-chemical structures, luminescence and related properties of II-VI compounds which are being utilised and exhaustively studied these days for their applications in LED's, modern optoelectronic devices, flat EL screens and panels, infrared detectors, photovoltaic and thermal solar energy converters etc. The book, therefore, should be useful to a wide variety of people (working in the field of luminescence and related properties of II-VI compounds, i.e. advanced graduate students) and serve as a review to researchers entering in this field and working on these materials. It should also be useful to solid state spectroscopists, lasers physicists; electronic and illuminating engineering people, and all those professionals using these materials.
Author : Ulrike Woggon
Publisher : Springer
ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.X/5 (4 download)
Download or read book Optical Properties of Semiconductor Quantum Dots written by Ulrike Woggon and published by Springer. This book was released on 1997 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an overview of the current understanding of the physics of zero-dimensional semiconductors. It concentrates mainly on quantum dots of wide-gap semiconductors, but touches also on zero-dimensional systems based on silicon and III-V materials. After providing the reader with a theoretical background, the author illustrates the specific properties of three-dimensionally confined semiconductors, such as the size dependence of energy states, optical transitions, and dephasing mechanisms with the results from numerous experiments in linear and nonlinear spectroscopy. Technological concepts of the growth concepts and the potential of this new class of semiconductor materials for electro-optic and nonlinear optical devices are also discussed.
Author : Joseph William May
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (898 download)
Download or read book Theoretical Insight Into the Manipulation of the Optical and Magnetic Properties of Transition-metal-doped II-VI Semiconductor Quantum Dots written by Joseph William May and published by . This book was released on 2014 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to tune the electronic, magnetic, and optical properties of II-VI semiconductor quantum dots (QDs) makes these materials ideal candidates in the fabrication of new solar energy, spin electronic, and phosphorescent devices. This dissertation makes use of electronic structure theory to provide insight into the physical underpinnings of magnetic exchange and photoexcitation in Mn2[superscript +]- and Co2[superscript +]-doped CdSe and ZnO QDs. Specifically, new methods for controlling these physical effects via the incorporation of various dopants or changes in the QD's size and shape are presented. Several examples of these control techniques are discussed in this dissertation. Ferromagnetic alignment of multiple unpaired Mn2[superscript +] 3d electrons is predicted when the p-type defect N2[superscript - ] is present in ZnO QDs. Control over the magnetic exchange interactions between charge carriers and TM2[superscript] dopants that give rise to ferromagnetism is achieved by distorting the QD's shape along one or two dimensions. Aliovalent doping with Al3[superscript +] produces QDs that are spectroscopically identical to photochemically charged QDs, yet exhibit different reactivities. A unique temperature dependence of the luminescence and photoconductivity in large Co2[superscript +] -doped ZnO QDs is predicted upon excitation of its mid-gap excited state. Lastly, a new method for the optimization of transition state molecular geometries is shown to exhibit fast optimization and to be advantageous for difficult optimizations where the reaction path is flat, ideal for optimizing large QD structures.
Author : Chulsoo Kim
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (448 download)
Download or read book Fabrication, Structural, and Optical Properties of Self Assembled II-VI Semiconductor Quantum Dots written by Chulsoo Kim and published by . This book was released on 2000 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kelly S. Sooklal
Publisher :
ISBN 13 :
Total Pages : 362 pages
Book Rating : 4.:/5 (47 download)
Download or read book Control of Physical and Optical Properties of II - VI Quantum Dots written by Kelly S. Sooklal and published by . This book was released on 1998 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Leonid Fradkin
Publisher :
ISBN 13 :
Total Pages : 111 pages
Book Rating : 4.:/5 (87 download)
Download or read book Magneto-optical Properties of Composite Semiconductor Quantum Dots written by Leonid Fradkin and published by . This book was released on 2005 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mukesh Jain
Publisher : World Scientific
ISBN 13 : 9814536830
Total Pages : 603 pages
Book Rating : 4.8/5 (145 download)
Download or read book Ii-vi Semiconductor Compounds written by Mukesh Jain and published by World Scientific. This book was released on 1993-05-04 with total page 603 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: X-Ray Characterisation of II-VI Semiconductor Materials (D Gao et al.)Electronic Structure of II-VI Semiconductors and Their Alloys (S-H Wei)Radiative Recombination Processes in Rare Earth Doped II-VI Materials (M Godlewski et al.)Nonlinear Optical Properties of Heavily Doped CdS (U Neukirch)Nanostructures of Broad Gap (II,Mn) VI Semiconductors (W Heimbrodt & O Goede)Co-Based II-VI Semimagnetic Semiconductors (A Twardowski et al.)Photoluminescence and Raman Scattering of ZnSe-ZnTe Strained Layer Superlattices (K Kumazaki)Novel Electronic Processes in Mercury-Based Superlattices (J R Meyer et al.)Strain, Pressure and Piezoelectric Effects in Strained II-VI Superlattices and Heterostructures (E Anastassakia)Electronic Structures of Strained II-VI Superlattices (T Nakayama)Devices and Applications of II-VI Compounds (S Colak)Solar Cells Based on II-VI Semiconductors (H Uda)ZnSe and Its Applications for Blue-Light Laser Diodes (M Pessa & D Ahn)Molecular Beam Epitaxy of HgCdTe for Electro-Optical Infrared Applications (J M A Cortés)and other papers Readership: Condensed matter physicists and electronic engineers. keywords:
Author : MariaC. Tamargo
Publisher : Routledge
ISBN 13 : 1351439375
Total Pages : 240 pages
Book Rating : 4.3/5 (514 download)
Download or read book II-VI Semiconductor Materials and their Applications written by MariaC. Tamargo and published by Routledge. This book was released on 2018-05-04 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: II-VI Semiconductor Materials and Their Applications deals with II-VI compound semiconductors and the status of the two areas of current optoelectronics applications: blue-green emitters and IR detectors. Specifically, the growth, charactrtization, materials and device issues for these two applications are described. Emphasis is placed on the wide bandgap emitters where much progress has occurred recently.The book also presents new directions that have potential, future applications in optoelectronics for II-VI materials. In particular, it discusses the status of dilute magnetic semiconductors for mango-optical and electromagnetic devices, nonlinear optical properties, photorefractive effects and new materials and physics phenomena, such as self-organized, low-dimensional structures.II_VI Semiconductor Materials and Their Applications is a valuable reference book for researchers in the field as well as a textbook for materials science and applied physics courses.
Author : Marcin L. Sadowski
Publisher : Springer Science & Business Media
ISBN 13 : 9401141584
Total Pages : 443 pages
Book Rating : 4.4/5 (11 download)
Download or read book Optical Properties of Semiconductor Nanostructures written by Marcin L. Sadowski and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 443 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical methods for investigating semiconductors and the theoretical description of optical processes have always been an important part of semiconductor physics. Only the emphasis placed on different materials changes with time. Here, a large number of papers are devoted to quantum dots, presenting the theory, spectroscopic investigation and methods of producing such structures. Another major part of the book reflects the growing interest in diluted semiconductors and II-IV nanosystems in general. There are also discussions of the fascinating field of photonic crystals. `Classical' low dimensional systems, such as GsAs/GaAlAs quantum wells and heterostructures, still make up a significant part of the results presented, and they also serve as model systems for new phenomena. New materials are being sought, and new experimental techniques are coming on stream, in particular the combination of different spectroscopic modalities.
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Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (638 download)
Download or read book Optical and Magnetic Resonance Properties of II-VI Quantum Qots [dots] written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Author : Huijuan Zhou
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (638 download)
Download or read book Optical and Magnetic Resonance Properties of II-VI Quantum Qots [dots] written by Huijuan Zhou and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : J.C. Woo
Publisher : CRC Press
ISBN 13 : 9780750310178
Total Pages : 548 pages
Book Rating : 4.3/5 (11 download)
Download or read book Compound Semiconductors 2004 written by J.C. Woo and published by CRC Press. This book was released on 2005-04-01 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compound Semiconductors 2004 was the 31st Symposium in this distinguished international series, held at Hoam Convention Center of Seoul National University, Seoul, Korea from September 12 to September 16, 2004. It attracted over 180 submissions from leading scientists in academic and industrial research institutions, and remains a major forum for the compound semiconductor research community since the first one held in 1966 at Edinburgh, UK under the name of 'International Symposium on Gallium Arsenide and related Compounds'. These proceedings provide an international perspective on the latest research and an overview of recent, important developments in III-V compounds, II-VI compounds and IV-IV compounds. In the total of 106 papers, notable progress was reported in the development of zinc oxide and spintronics. Steady advances were seen in traditional topics such as III-V based electronic and optoelectronic devices, growth and processing, and characterization. Novel research trends were observed in quantum structures, such as quantum wires and dots, which are promising for future developments in nanotechnology. As the primary forum for research into these materials and their device applications the book is an essential reference for researchers working on compound semiconductors in semiconductor physics, device physics, materials science, chemistry and electronic and electrical engineering.
Author : Andreas Hans Russ
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (845 download)
Download or read book Magneto-optical Studies of Quantum Dots written by Andreas Hans Russ and published by . This book was released on 2013 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significant effort in condensed matter physics has recently been devoted to the field of "spintronics" which seeks to utilize the spin degree of freedom of electrons. Unlike conventional electronics that rely on the electron charge, devices exploiting their spin have the potential to yield new and novel technological applications, including spin transistors, spin filters, and spin-based memory devices. Any such application has the following essential requirements:1) Efficient electrical injection of spin-polarized carriers;2) Long spin lifetimes;3) Ability to control and manipulate electron spins;4) Effective detection of spin-polarized carriers. Recent work has demonstrated efficient electrical injection from ferromagnetic contacts such as Fe and MnAs, utilizing a spin-Light Emitting Diode (spin-LED) as a method of detection. Semiconductor quantum dots (QDs) are attractive candidates for satisfying requirements 2 and 3 as their zero dimensionality significantly suppresses many spin-flip mechanisms leading to long spin coherence times, as well as enabling the localization and manipulation of a controlled number of electrons and holes. This thesis is composed of three projects that are all based on the optical properties of QD structures including:I) Intershell exchange between spin-polarized electrons occupying adjacent shells in InAs QDs;II) Spin-polarized multiexitons in InAs QDs in the presence of spin-orbit interactions;III) The optical Aharonov-Bohm effect in AlxGa1-xAs/AlyGa1-yAs quantum wells (QWs). In the following we introduce some of the basic optical properties of quantum dots, describe the main tool (spin-LED) employed in this thesis to inject and detect spins in these QDs, and conclude with the optical Aharonov-Bohm effect (OAB) in type-II QDs.
Author : Xinyu Liu
Publisher : Woodhead Publishing
ISBN 13 : 0081027362
Total Pages : 398 pages
Book Rating : 4.0/5 (81 download)
Download or read book Chalcogenide written by Xinyu Liu and published by Woodhead Publishing. This book was released on 2019-11-14 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chalcogenide: From 3D to 2D and Beyond reviews graphene-like 2D chalcogenide systems that include topological insulators, interesting thermoelectric structures, and structures that exhibit a host of spin phenomena that are unique to 2D and lower-dimensional geometries. The book describes state-of-the-art materials in growth and fabrication, magnetic, electronic and optical characterization, as well as the experimental and theoretical aspects of this family of materials. Bulk chalcogenides, chalcogenide films, their heterostructures and low-dimensional chalcogenide-based quantum structures are discussed. Particular attention is paid to findings that are relevant to the continued search for new physical phenomena and new functionalities. Finally, the book covers the enormous opportunities that have emerged as it has become possible to achieve lower-dimensional chalcogenide structures by epitaxial techniques. Provides readers with foundational information on the materials growth, fabrication, magnetic, electronic and optical characterization of chalcogenide materials Discusses not only bulk chalcogenides and chalcogenide thin films, but also two-dimensional chalcogenide materials systems Reviews the most important applications in optoelectronics, photovoltaics and thermoelectrics
