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Author: Chelsey Dorow Publisher: ISBN: Category : Languages : en Pages : 71
Book Description
Over several decades, research in semiconductor physics has revealed a rich plethora of physical phenomena filled with electric, magnetic, and optical processes for physicists and engineers to observe and manipulate. In addition to hosting a number of fundamental discoveries in physics, several of which merited Nobel Prizes, semiconductor physics has also revolutionized modern technology, most notably in the field of computing. An especially interesting topic in this field is the physics of quasiparticles, which are excitations or disturbances in matter that resemble particles in free space. This dissertation focuses on excitons, which are quasiparticles that exist in semiconductor materials and are a bound state of an electron and a hole. Excitons can interact with light, either through their photo-generation or by radiative recombination of the electron and hole, and therefore can aid in the study of the interaction of light and matter. This dissertation in particular looks at a specially engineered system of excitons: indirect excitons in coupled quantum wells. In this system, the electron and hole of the exciton are confined to two separate quantum well layers and are as a result separated in space, typically by ∼ 10 nm, depending on the coupled quantum well structure. Indirect excitons possess several unique properties including a built-in electric dipole moment, long lifetimes, energy control by applied voltage, and the ability to form a quantum Bose gas, making them a useful system to study fundamental physics of cold bosons and to investigate ways to integrate these properties into modern day technology. The experiments detailed in this dissertation probe the basic physics of exciton transport in high magnetic fields and expand upon our current understanding of how nano-scale devices can be used to control electronic and optical processes in solids.
Author: Chelsey Dorow Publisher: ISBN: Category : Languages : en Pages : 71
Book Description
Over several decades, research in semiconductor physics has revealed a rich plethora of physical phenomena filled with electric, magnetic, and optical processes for physicists and engineers to observe and manipulate. In addition to hosting a number of fundamental discoveries in physics, several of which merited Nobel Prizes, semiconductor physics has also revolutionized modern technology, most notably in the field of computing. An especially interesting topic in this field is the physics of quasiparticles, which are excitations or disturbances in matter that resemble particles in free space. This dissertation focuses on excitons, which are quasiparticles that exist in semiconductor materials and are a bound state of an electron and a hole. Excitons can interact with light, either through their photo-generation or by radiative recombination of the electron and hole, and therefore can aid in the study of the interaction of light and matter. This dissertation in particular looks at a specially engineered system of excitons: indirect excitons in coupled quantum wells. In this system, the electron and hole of the exciton are confined to two separate quantum well layers and are as a result separated in space, typically by ∼ 10 nm, depending on the coupled quantum well structure. Indirect excitons possess several unique properties including a built-in electric dipole moment, long lifetimes, energy control by applied voltage, and the ability to form a quantum Bose gas, making them a useful system to study fundamental physics of cold bosons and to investigate ways to integrate these properties into modern day technology. The experiments detailed in this dissertation probe the basic physics of exciton transport in high magnetic fields and expand upon our current understanding of how nano-scale devices can be used to control electronic and optical processes in solids.
Author: Jason Leonard Publisher: Springer ISBN: 3319697331 Category : Technology & Engineering Languages : en Pages : 67
Book Description
This thesis presents results crucial to the emerging field of indirect excitons. These specially designed quasiparticles give the unique opportunity to study fundamental properties of quantum degenerate Bose gases in semiconductors. Furthermore, indirect excitons allow for the creation of novel optoelectronic devices where excitons are used in place of electrons. Excitonic devices are explored for the development of advanced signal processing seamlessly coupled with optical communication. The thesis presents and describes the author's imaging experiments that led to the discovery of spin transport of excitons. The many firsts presented herein include the first studies of an excitonic conveyer, leading to the discovery of the dynamical localization-delocalization transition for excitons, and the first excitonic ramp and excitonic diode with no energy-dissipating voltage gradient.
Author: Matthew W. Hasling Publisher: ISBN: Category : Languages : en Pages : 62
Book Description
Indirect excitons are bosonic quasiparticles composed of an electron and a hole confined to spatially separated quantum wells. Many properties of excitons, such as their low effective mass, long lifetime, tunable energy, and optically active nature, make them an ideal system for studying condensed matter phenomena. This dissertation explores the transport properties associated with indirect excitons in various environments. In this dissertation, exciton transport is studied in multiple devices, created by carefully patterned electrodes, which create a varied potential energy landscape for the excitons. The first device is used to trap large amounts of excitons, which can be used to study the properties of dense exciton gases. The second device is used as a stirring potential for indirect excitons, and can give excitons angular momentum while they collect to the center of the device. In addition, a record high quality single quantum well structure is characterized, which may prove to be a new platform for studying indirect excitons. Measurements of this new sample show large transport and a record high diffusion coefficient for indirect excitons.
Author: Yuliya Yevgenyevna Kuznetsova Publisher: ISBN: 9781321451900 Category : Languages : en Pages : 67
Book Description
This dissertation explores studies of transport of indirect excitons (bosonic quasiparticles composed of bound pairs of an electron and a hole confined to spatially separated layers) in GaAs coupled quantum wells. The small mass and long lifetime of indirect excitons result in a relatively high quantum degeneracy temperature and efficient cooling, making indirect excitons a model system for studies of physics of cold bosons. In addition, indirect excitons are optically active, electronically controllable and have long enough lifetimes that their transport distances can be accommodated by lithography. These properties make indirect excitons a promising system for creating excitonic devices. The direction of the research presented in this dissertation is thus twofold: studying fundamental physics of excitons, including transport, thermalization, coherence, spin currents, and properties in high magnetic fields, and realization of optical excitonic devices, such as traps and transistors.
Author: Laurens D. A. Siebbeles Publisher: John Wiley & Sons ISBN: 352763309X Category : Technology & Engineering Languages : en Pages : 293
Book Description
As functional elements in opto-electronic devices approach the singlemolecule limit, conducting organic molecular wires are the appropriate interconnects that enable transport of charges and charge-like particles such as excitons within the device. Reproducible syntheses and a thorough understanding of the underlying principles are therefore indispensable for applications like even smaller transistors, molecular machines and light-harvesting materials. Bringing together experiment and theory to enable applications in real-life devices, this handbook and ready reference provides essential information on how to control and direct charge transport. Readers can therefore obtain a balanced view of charge and exciton transport, covering characterization techniques such as spectroscopy and current measurements together with quantitative models. Researchers are thus able to improve the performance of newly developed devices, while an additional overview of synthesis methods highlights ways of producing different organic wires. Written with the following market in mind: chemists, molecular physicists, materials scientists and electrical engineers.
Author: Henning Soller Publisher: Logos Verlag Berlin GmbH ISBN: 3832533796 Category : Science Languages : en Pages : 144
Book Description
The subject of this thesis is the study of hybrid nanoelectronic components involving superconductors or excitonic systems. The behavior of such electronic devices is relevant both for the miniaturization of electronics as well as for possible future on-chip quantum computation. In order to characterise them the cumulant generating function of charge transfer is calculated. First, quantum point contacts between (conventional und unconventional) superconductors, ferromagnets and semiconductors are investigated. The focus of interest are transport processes involving non-trivial correlated electronic states such as Cooper pairs, excitons or Majorana fermions. In the second part quantum impurities are included and the effects of onsite Coulomb and electron-phonon interaction are discussed. Using these results the possibility to witness entanglement in superconducting beamsplitters is demonstrated. The results are compared both to different theoretical approaches and experimental data.
Author: Publisher: Elsevier ISBN: 0443193932 Category : Science Languages : en Pages : 270
Book Description
Semiconductors and Semimetals series, highlights new advances in the field, with this new volume presenting interesting chapters. Each chapter is written by an international board of authors. - Provides the latest information on cancer research - Offers outstanding and original reviews on a range of cancer research topics - Serves as an indispensable reference for researchers and students alike
Author: Eckehard Schöll Publisher: Springer Science & Business Media ISBN: 1461558077 Category : Technology & Engineering Languages : en Pages : 394
Book Description
Recent advances in the fabrication of semiconductors have created almost un limited possibilities to design structures on a nanometre scale with extraordinary electronic and optoelectronic properties. The theoretical understanding of elec trical transport in such nanostructures is of utmost importance for future device applications. This represents a challenging issue of today's basic research since it requires advanced theoretical techniques to cope with the quantum limit of charge transport, ultrafast carrier dynamics and strongly nonlinear high-field ef fects. This book, which appears in the electronic materials series, presents an over view of the theoretical background and recent developments in the theory of electrical transport in semiconductor nanostructures. It contains 11 chapters which are written by experts in their fields. Starting with a tutorial introduction to the subject in Chapter 1, it proceeds to present different approaches to transport theory. The semiclassical Boltzmann transport equation is in the centre of the next three chapters. Hydrodynamic moment equations (Chapter 2), Monte Carlo techniques (Chapter 3) and the cellular au tomaton approach (Chapter 4) are introduced and illustrated with applications to nanometre structures and device simulation. A full quantum-transport theory covering the Kubo formalism and nonequilibrium Green's functions (Chapter 5) as well as the density matrix theory (Chapter 6) is then presented.
Author: Carl. R Poelking Publisher: Springer ISBN: 3319695991 Category : Technology & Engineering Languages : en Pages : 142
Book Description
This book focuses on the microscopic understanding of the function of organic semiconductors. By tracing the link between their morphological structure and electronic properties across multiple scales, it represents an important advance in this direction. Organic semiconductors are materials at the interface between hard and soft matter: they combine structural variability, processibility and mechanical flexibility with the ability to efficiently transport charge and energy. This unique set of properties makes them a promising class of materials for electronic devices, including organic solar cells and light-emitting diodes. Understanding their function at the microscopic scale – the goal of this work – is a prerequisite for the rational design and optimization of the underlying materials. Based on new multiscale simulation protocols, the book studies the complex interplay between molecular architecture, supramolecular organization and electronic structure in order to reveal why some materials perform well – and why others do not. In particular, by examining the long-range effects that interrelate microscopic states and mesoscopic structure in these materials, the book provides qualitative and quantitative insights into e.g. the charge-generation process, which also serve as a basis for new optimization strategies.
Author: Chelsey Dorow
Author: Chelsey Dorow
Author: Jason Leonard
Author: 
Author: Matthew W. Hasling
Author: Yuliya Yevgenyevna Kuznetsova
Author: Laurens D. A. Siebbeles
Author: Henning Soller
Author: 
Author: Eckehard Schöll
Author: Carl. R Poelking