Download or read book Exciton Photon and Phonon Interactions in Semiconductor Quantum Dots written by Kaijie Xu and published by . This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Semiconductor Quantum Dots written by Y. Masumoto and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Vibrational Properties and Exciton phonon Interactions in Lead Sulfide Nanocrystals written by Todd Douglas Krauss and published by . This book was released on 1998 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tailored Electron phonon Interactions in Semiconductor Double Quantum Dots written by Thomas Richard Hartke and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Carrier phonon Interactions in Semiconductor Quantum Dots written by Jan Seebeck and published by . This book was released on 2009 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Colloidal Quantum Dot Optoelectronics and Photovoltaics written by Gerasimos Konstantatos and published by Cambridge University Press. This book was released on 2013-11-07 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Captures the most up-to-date research in the field, written in an accessible style by the world's leading experts.
Download or read book Quantum Dots for Quantum Information Technologies written by Peter Michler and published by Springer. This book was released on 2017-06-01 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the most recent developments in quantum dot spin physics and the generation of deterministic superior non-classical light states with quantum dots. In particular, it addresses single quantum dot spin manipulation, spin-photon entanglement and the generation of single-photon and entangled photon pair states with nearly ideal properties. The role of semiconductor microcavities, nanophotonic interfaces as well as quantum photonic integrated circuits is emphasized. The latest theoretical and experimental studies of phonon-dressed light matter interaction, single-dot lasing and resonance fluorescence in QD cavity systems are also provided. The book is written by the leading experts in the field.
Download or read book Semiconductor Quantum Science and Technology written by and published by Academic Press. This book was released on 2020-11-28 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor quantum science and technology is exploring the exciting and emerging prospects of integrating quantum functionality on semiconductor platforms to convert current information technology into quantum information technology. The past twenty years have led to incredible advances in this field. This book brings together the leading scientists who present the main achievements and challenges by reviewing and motivating the state-of-the-art at a tutorial level. The key challenges include creating quantum-light sources, quantum information processing via strong light-matter interaction, discovering new quantum materials as well as quasiparticles, and determining new quantum spectroscopic methodologies for superior control of quantum phenomena. As an important step, integration of these solutions on a semiconductor chip is discussed, and outlook for the future of semiconductor quantum science and technology is given. Leading experts present their vision on semiconductor quantum science and technology All aspects needed to realize semiconductor quantum science and technology are explained Quantum semiconductors from overviewed a tutorial introduction to the state-of-the-art
Download or read book Single Quantum Dots written by Peter Michler and published by Springer Science & Business Media. This book was released on 2003-12-09 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special focus is given to the optical and electronic properties of single quantum dots due to their potential applications in devices operating with single electrons and/or single photons. This includes quantum dots in electric and magnetic fields, cavity-quantum electrodynamics, nonclassical light generation, and coherent optical control of excitons.
Download or read book Quantum Dot phonon Interactions in Semiconductor Quantum Optics written by Ignacio Wilson-Rae and published by . This book was released on 2003 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploiting Phonon and Coulomb Interactions in Semiconductor Quantum Dots written by Clemens Spinnler and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resonant Photon exciton Interaction in Semiconductor Quantum Dots written by Martin Kroner and published by . This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Dot Heterostructures written by Dieter Bimberg and published by John Wiley & Sons. This book was released on 1999-03-17 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Da die Nachfrage nach immer schnelleren und kleineren Halbleiterbauelementen stetig wächst, sind Quanten-Dots und -Pyramiden rasant in den Mittelpunkt der Halbleiterforschung gerückt. Dieses Buch vermittelt einen umfassenden Überblick über den aktuellen Forschungsstand auf diesem Gebiet. Behandelt werden u.a. Fragen, wie Strukturen aufgebaut, wie sie charakterisiert werden und wie sie die Leistungsfähigkeit der Bauelemente bestimmen. (11/98)
Download or read book Non Equilibrium Dynamics of Semiconductors and Nanostructures written by Kong-Thon Tsen and published by CRC Press. This book was released on 2018-10-03 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of the femto-second laser has enabled us to observe phenomena at the atomic timescale. One area to reap enormous benefits from this ability is ultrafast dynamics. Collecting the works of leading experts from around the globe, Non-Equilibrium Dynamics of Semiconductors and Nanostructures surveys recent developments in a variety of areas in ultrafast dynamics. In eight authoritative chapters illustrated by more than 150 figures, this book spans a broad range of new techniques and advances. It begins with a review of spin dynamics in a high-mobility two-dimensional electron gas, followed by the generation, propagation, and nonlinear properties of high-amplitude, ultrashort strain solitons in solids. The discussion then turns to nonlinear optical properties of nanoscale artificial dielectrics, optical properties of GaN self-assembled quantum dots, and optical studies of carrier dynamics and non-equilibrium optical phonons in nitride-based semiconductors. Rounding out the presentation, the book examines ultrafast non-equilibrium electron dynamics in metal nanoparticles, monochromatic acoustic phonons in GaAs, and electromagnetically induced transparency in semiconductor quantum wells. With its pedagogical approach and practical, up-to-date coverage, Non-Equilibrium Dynamics of Semiconductors and Nanostructures allows you to easily put the material into practice, whether you are a seasoned researcher or new to the field.
Download or read book Single Semiconductor Quantum Dots written by Peter Michler and published by Springer Science & Business Media. This book was released on 2009-06-13 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews recent advances in the field of semiconductor quantum dots via contributions from prominent researchers in the scientific community. Special focus is given to optical, quantum optical, and spin properties of single quantum dots.
Download or read book On the Interactions Between Charges Phonons and Photons in Electric Field Tunable Quantum Dot Molecules written by and published by . This book was released on 2001 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Exciton Relaxation and Electron Transfer Dynamics of Semiconductor Quantum Dots written by Cunming Liu and published by . This book was released on 2015 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Quantum dots (QDs) exhibit unique electronic and optical properties arising from their three-dimensional confinement and strongly enhanced coulomb interactions. Developing a detailed understanding of their exciton relaxation dynamics is important not only for the sake of exploring the fundamental physics of quantum confinement processes, but also for their potential applications. Ultrafast transient absorption (TA) spectroscopy, which has been proven as a powerful tool to explore the relaxation dynamics of excitons, was employed to characterize the hot single/multiexciton relaxation dynamics at the first four exciton states 1Se-1S3/2 (1S), 1Se-2S3/2 (2S), 1Pe-1P3/2 (1P) and 1Se-2S1/2 (2SH) of CdSe/CdZnS QDs. We found all exciton states can accomplish their initialization in sub-ps timescales. And, the 1S single exciton mainly relaxes to surface trapping state with a lifetime of 0.90 ł 0.02 ns. A 74 ł 2 ps Auger recombination occurs to nonradiatively annihilate 1S multiexctions under higher pump fluence. We also observed for the first time that the 2S hot hole can relax via two possible pathways-intraband multiple phonon coupling (2S3/2-1P3/2 or 2S3/2-1S3/2) and the intrinsic defect trapping, with a lifetime of 7 ł 2 ps. Owing to the overlap between highly energetic 1P and 2SH exciton states, their probed dynamics both show the characteristics of 1P and 2SH exciton states. Surprisingly, an ultra-short component of 8 ł 1 ps, directly associated with the Auger recombination at the 1P exciton state, was discovered under higher pump fluence. After finishing the studies of exciton relaxation inside QDs, ultrafast TA spectroscopy was further applied to explore the electron transferring outside from QDs. By employing a novel photocatalytic system consisting of water-soluble CdSe QDs and Ni-dihydrolipoic acid (Ni-DHLA) catalyst, which has represented a robust photocatalysis of H2 from water, the photoinduced electron transfer (ET) dynamics between QDs and catalyst, one of most primary steps during H2 generation, was studied. We found that smaller bare CdSe QDs exhibit a better ET performance with an amplitude-weighted average lifetime of 69 ł 2 ps. And, nearly ~90% of TA signal in the presence of Ni-DHLA can be attributed to the ET process. CdS shelling on the bare CdSe QDs worsens the ET between QDs and Ni-DHLA catalysts. Under higher pump fluence, the ET performance with CdSe/CdS core-shell QDs is improved because of the Auger recombination in CdSe cores strongly suppressed by CdS shelling, which is contrary with bare CdSe QDs. These studies may supply potential ways to optimize the QDs sensitized photocatalytic systems for H2 production. Finally, by virtue of effective mass approximation (EMA) method and Marcus theory, the mechanism of ET between CdSe QDs and Ni-DHLA catalysts was clarified in theory. Additionally, photoluminescence (PL) quenching and time-resolved PL measurements were used to demonstrate that the main pathway for ET between QDs and Ni-DHLA catalysts is through dynamic collisions. As Ni-DHLA concentration increases, the static attachment between QDs and Ni-DHLA catalyst molecules can occur to further speed up the ET process from QDs to Ni-DHLA catalysts."--Pages vi-vii.
