Tailored Electron Phonon Interactions In Semiconductor Double Quantum Dots
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Tailored Electron Phonon Interactions In Semiconductor Double Quantum Dots
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Author : Thomas Richard Hartke
language : en
Publisher:
Release Date : 2017
Tailored Electron Phonon Interactions In Semiconductor Double Quantum Dots written by Thomas Richard Hartke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This thesis demonstrates the construction of a double quantum dot (DQD) in an Indium Arsenide (InAs) nanowire that is mechanically suspended in vacuum between metal contacts and capacitively coupled to a superconducting microwave resonator. This mechanical suspension scheme places the DQD at the center of an effective 380 nm long phonon cavity created by the contacts supporting the ends of the suspended nanowire. Because electron-phonon coupling mechanisms lead to electron transport through the DQD, measurements of current can be used as a probe of the phonon density of states in the nanostructure. Current measurements reveal strong signatures of electron-phonon coupling at energies corresponding to the guitar string vibrational modes of the suspended nanowire. In addition, photon emission has recently been observed in InAs nanowire DQDs coupled to superconducting cavities. However, it has been proposed that a phonon must simultaneously be emitted with each photon to ensure energy conservation. Therefore the photon emission rate should be enhanced when the emitted phonons couple strongly to electrons in the DQD. We quantitatively confirm this hypothesis by independently measuring both the photon emission into the cavity and the electron-phonon coupling strength as a function of the DQD energy splitting.
Carrier Phonon Interactions In Semiconductor Quantum Dots
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Author : Jan Seebeck
language : en
Publisher:
Release Date : 2009
Carrier Phonon Interactions In Semiconductor Quantum Dots written by Jan Seebeck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Quantum Dot Phonon Interactions In Semiconductor Quantum Optics
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Author : Ignacio Wilson-Rae
language : en
Publisher:
Release Date : 2003
Quantum Dot Phonon Interactions In Semiconductor Quantum Optics written by Ignacio Wilson-Rae and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Jjap
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Author :
language : en
Publisher:
Release Date : 2010
Jjap written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Physics categories.
On The Interactions Between Charges Phonons And Photons In Electric Field Tunable Quantum Dot Molecules
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Author :
language : en
Publisher:
Release Date : 2001
On The Interactions Between Charges Phonons And Photons In Electric Field Tunable Quantum Dot Molecules written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
This dissertation focuses on the optical properties of single InAs/GaAs quantum dot molecules. A quantum dot molecule consists of a pair of quantum dots coupled by a nanometer scale tunneling barrier. Compared to single quantum dots, quantum dot molecules provide greatly enhanced versatility - with the ease of an electric field control, one gains broad flexibility to tune electronic energy levels and manipulate particle tunneling within a QDM. As a consequence, individual QDMs are being intensely studied as controllable interfaces of charge, spin and photonic quantum states at the single particle level. On the other hand, phonons - the quantized vibrations of the underlying crystal lattice - have mostly been left outside the realm of coherent control. In the domain of solid-state quantum technologies, the ubiquitous phonons are mainly considered for the limitations they impose. Omnipresent electron-phonon interactions and the predominantly dissipative nature of phonons are typically a major source of decoherence of the atom-like quantum states hosted by low-dimensional solid-state structures, such as QDMs. Here, we report experimental and theoretical results on the interactions between charges, photons and phonons in electric field tunable quantum dot molecules. Using an effective mass perturbation model, we compute the low energy biexciton states of a quantum dot molecule and apply them to provide a theoretical description of the dipole-dipole interaction between two excitons occupying separate dots in a quantum dot molecule. The expected properties of these so called dipolar states are presented, and we highlight their potential application as a switch for manipulating the transition energy and tunneling properties of the ground state neutral exciton. We then present results from a comprehensive investigation of the quantum confined Stark effect in quantum dot molecules, in which we studied the electric-field dependent energy shifts of exciton states as a function of the tunneling barrier width. Our experimental and computational results reveal that molecular wavefunction formation in quantum dot molecules strongly affects the quantum confined Stark effect, even as the dots are tuned far from resonance for particle tunneling. This dissertation culminates with our report of a novel mechanism by which phonons are made non-dissipative and coherent via electric field control and the optically driven formation of a molecular polaron in a quantum dot molecule. The coherent interaction of a single optical phonon with individual electronic states is revealed via a Fano-type quantum interference that produces a phonon-induced transparency in the optical absorption of individual quantum dot molecules. Experimentally, we find that the transparency is widely tunable by electronic and optical means, and provides a mechanism for amplifying weak coupling channels. This work is significant in that it demonstrates a specific mechanism by which typically incoherent and dissipative phonons are made to behave in a coherent and non-dissipative manner. As such, we demonstrate that phonons may enter the realm of mutual control of quantum states on the single particle level, which so far has been dominated by photons, electrons and spins.
Quantum Dot Optoelectronic Devices
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Author : Peng Yu
language : en
Publisher: Springer Nature
Release Date : 2020-04-16
Quantum Dot Optoelectronic Devices written by Peng Yu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-16 with Technology & Engineering categories.
This book captures cutting-edge research in semiconductor quantum dot devices, discussing preparation methods and properties, and providing a comprehensive overview of their optoelectronic applications. Quantum dots (QDs), with particle sizes in the nanometer range, have unique electronic and optical properties. They have the potential to open an avenue for next-generation optoelectronic methods and devices, such as lasers, biomarker assays, field effect transistors, LEDs, photodetectors, and solar concentrators. By bringing together leaders in the various application areas, this book is both a comprehensive introduction to different kinds of QDs with unique physical properties as well as their preparation routes, and a platform for knowledge sharing and dissemination of the latest advances in a novel area of nanotechnology.
Inelastic Light Scattering Of Semiconductor Nanostructures
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Author : Christian Schüller
language : en
Publisher: Springer
Release Date : 2006-09-13
Inelastic Light Scattering Of Semiconductor Nanostructures written by Christian Schüller and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-09-13 with Technology & Engineering categories.
The field of semiconductor nanostructures is of enormous and still-growing research interest. On one hand, they are already realized in mass products such as high-electron-mobility field-effect transistors and quantum-well lasers. On the other hand, they allow, in specially tailored systems, the investigation of fundamental properties such as many-particle interactions of electrons in reduced dimensions. This book bridges the gap between general semiconductor textbooks and research articles.
Quantum Coherent Electron Phonon Nanolaboratories
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Author :
language : en
Publisher:
Release Date : 2003
Quantum Coherent Electron Phonon Nanolaboratories written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
This project was aimed at creating mechanically suspended nanostructures that include active electronic devices, with the goal of achieving coherence between electrons and vibrational phonons. We pursued separately the use of metal tunnel junctions (515 tunnel junctions and single-electron transistors, SETs), and electrostatically defined double quantum dots, as the electronic system. We performed cryogenic measurements with varying degrees of success. Due to unanticipated difficulties, the focus shifted direction several times. Our most successful implementation was the use of an SET coupled to the vibrational motion of a doubly-clamped 100 MHz flexural resonator, with which we achieved a displacement sensitivity roughly 100 times the quantum limit of motion. A ten times higher frequency resonator, at I GHz, could be detected at 10 times the quantum limit. We believe further improvement in the sensitivity and noise of the displacement sensor is possible. Other areas of research, such as using double-quantum dots, did not prove as illuminating or useful; direct, resonant coupling as observed by dc current-voltage measurements did not reveal the hoped-for signatures of resonant coupling. There are a number of reasons as to why this may be, and further work might further elucidate the physics.
Phonons In Nanostructures
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Author : Michael A. Stroscio
language : en
Publisher: Cambridge University Press
Release Date : 2001-08-23
Phonons In Nanostructures written by Michael A. Stroscio and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-08-23 with Science categories.
This book focuses on the theory of phonon interactions in nanoscale structures with particular emphasis on modern electronic and optoelectronic devices. The continuing progress in the fabrication of semiconductor nanostructures with lower dimensional features has led to devices with enhanced functionality and even novel devices with new operating principles. The critical role of phonon effects in such semiconductor devices is well known. There is therefore a great need for a greater awareness and understanding of confined phonon effects. A key goal of this book is to describe tractable models of confined phonons and how these are applied to calculations of basic properties and phenomena of semiconductor heterostructures. The level of presentation is appropriate for undergraduate and graduate students in physics and engineering with some background in quantum mechanics and solid state physics or devices. A basic understanding of electromagnetism and classical acoustics is assumed.
Semiconductor Quantum Dots
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Author : Y. Masumoto
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17
Semiconductor Quantum Dots written by Y. Masumoto 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 2013-04-17 with Technology & Engineering categories.
Semiconductor quantum dots represent one of the fields of solid state physics that have experienced the greatest progress in the last decade. Recent years have witnessed the discovery of many striking new aspects of the optical response and electronic transport phenomena. This book surveys this progress in the physics, optical spectroscopy and application-oriented research of semiconductor quantum dots. It focuses especially on excitons, multi-excitons, their dynamical relaxation behaviour and their interactions with the surroundings of a semiconductor quantum dot. Recent developments in fabrication techniques are reviewed and potential applications discussed. This book will serve not only as an introductory textbook for graduate students but also as a concise guide for active researchers.