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Photoinduced Intersubband Transitions Due To Electrons Holes And Excitons In Gaas Algaas Quantum Wells
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Book Synopsis PHOTOINDUCED INTERSUBBAND TRANSITIONS DUE TO ELECTRONS HOLES AND EXCITONS IN GaAs/AlGaAs QUANTUM WELLS by : Yuval Garini
Download or read book PHOTOINDUCED INTERSUBBAND TRANSITIONS DUE TO ELECTRONS HOLES AND EXCITONS IN GaAs/AlGaAs QUANTUM WELLS written by Yuval Garini and published by . This book was released on 1994 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intersubband Transitions in Quantum Wells by : Emmanuel Rosencher
Download or read book Intersubband Transitions in Quantum Wells written by Emmanuel Rosencher and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the lectures delivered at the NATO Advanced Research Workshop on the "Intersubband Transistions in Quantum Wells" held in Cargese, France, between the t 9 h and the 14th of September 1991. The urge for this Workshop was justified by the impressive growth of work dealing with this subject during the last two or three years. Indeed, thanks to recent progresses of epitaxial growth techniques, such as Molecular Beam Epitaxy, it is now possible to realize semiconductor layers ( e.g. GaAs) with thicknesses controlled within one atomic layer, sandwiched between insulating layers (e.g. AlGaAs). When the semiconducting layer is very thin, i.e. less than 15 nm, the energy of the carriers corresponding to their motion perpendicular to these layers is quantized, forming subbands of allowed energies. Because of the low effective masses in these semiconducting materials, the oscillator strengths corresponding to intersubband transitions are extremely large and quantum optical effects become giant in the 5 - 20 ~ range: photoionization, optical nonlinearities, ... Moreover, a great theoretical surprise is that - thanks to the robustness of the effective mass theory - these quantum wells are a real life materialization of our old text book one-dimensional quantum well ideal. Complex physical phenomena may then be investigated on a simple model system.
Book Synopsis Intersubband Transitions in Quantum Wells: Physics and Devices by : Sheng S. Li
Download or read book Intersubband Transitions in Quantum Wells: Physics and Devices written by Sheng S. Li and published by Springer. This book was released on 1998-07-31 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of Intersubband Transitions in Quantum Wells: Physics and Devices is to facilitate the presentation and discussion of the recent results in theoretical, experimental, and applied aspects of intersubband transitions in quantum wells and dots. This reference work is based on the International Workshop that was held at National Cheng Kung University in Tainan, Taiwan in December 15-18, 1997. Intersubband transitions in quantum wells and quantum dots have attracted considerable attention in recent years, mainly due to the promise of various applications in the mid- and far-infrared regions (2-30 mum). Over 40 invited and contributed papers were presented in this four-day workshop, with topics covering most aspects of the intersubband transition phenomena including: the basic intersubband transition process, multiquantum well infrared photodetector (QWIP) physics, large format (640×480) GaAs QWIP (with 9.0 mum cutoff) focal plane arrays (FPAs) for IR imaging camera applications, infrared modulation, intersubband emission including mid- and long-wavelength quantum cascade (QC) lasers such as short (lambda = 3.4 mum) and long (lambda = 11.5 mum) wavelength room temperature QC lasers, quantum fountain intersubband laser at 15.5 mum wavelength in GaAs/AIGaAs quantum well, harmonic generation and nonlinear effects, ultra-fast phenomena such as terahertz (THz) intersubband emission and detection. Intersubband Transitions in Quantum Wells: Physics and Devices will be of interest to researchers from universities and industrial laboratories working on physics and devices of nanostructures, and researchers in the infrared (IR) community.
Book Synopsis Luminescence Anomaly of Two-Dimensional Excitons in GaAs Coupled Quantum Wells by : T. Fukuzawa
Download or read book Luminescence Anomaly of Two-Dimensional Excitons in GaAs Coupled Quantum Wells written by T. Fukuzawa and published by . This book was released on 1992 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possibility of a phase transition into an ordered state in a two-dimensional (2D) system of spatially separated electron-hole pairs has been suggested by Lozovik and Yudson and Shevchenko independently. Their proposal has recently been extended by Fukuzawa to a system formed by two GaAs/AlGaAs coupled quantum wells subject to an electric field. The long exciton lifetimes that can be achieved in such a semiconductor heterostructure, as well as the small Coulomb screening due to the interaction between oriented dipoles, make it particularly suitable for the study of phase transitions, be it like the one proposed by Lozovik and Yudson, and Shevchenko, or a Kosterliz-Thouless transition of a neutral Coulomb gas. The photoluminescence (PL) of GaAs-GaO. 7A10.3As structures consisting of two 50A quantum wells separated by a 40A barrier has shown a dramatic temperature dependence when an electric field is applied perpendicular to the well interfaces. The polarization of carriers and the energy shifts induced by the field lead to a PL spectrum consisting of two distinct peaks, one of which is associated with spatially direct interband transitions and another, much more intense, that involves spatially-separated electrons and holes (type-11 exciton).
Book Synopsis Electrons, Phonons and Their Interactions in Novel Modulation Doped GaAs/AlAs Based Quantum Wells by :
Download or read book Electrons, Phonons and Their Interactions in Novel Modulation Doped GaAs/AlAs Based Quantum Wells written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lowest energy interband transitions in AlGaAs/AlAs quantum wells involve electrons localized in the AlAs x-valleys and holes confined in the AlGaAs layers. These transitions are indirect in both real as well as in kappa-space and are accompanied by strong replicas of the GaAs and AlAs phonons. When a magnetic field is applied perpendicular to the layers a large reduction in the recombination intensity is observed. This reduction is attributed to magnetic field induced localization of the carriers which results in a reduction of the electron-hole wavefunction overlap. We have also studied photoluminescence spectra from type-II, n-type, modulation doped GaAs/AlAs quantum wells due to radiative recombination of electrons localized in the AlAs x-valleys with holes confined in the GaAs layers. In the presence of a magnetic field the emission spectra exhibit features associated with transitions among the AlAs x-valley Landau levels and photo-injected holes. The slopes of these transitions yield an effective mass m = 0.44 for the electrons.
Book Synopsis Quantum Well Intersubband Transition Physics and Devices by : Hui C. Liu
Download or read book Quantum Well Intersubband Transition Physics and Devices written by Hui C. Liu and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intersubband transitions in quantum wells have attracted tremendous attention in recent years, mainly due to the promise of applications in the mid and far-infrared regions (2--20 mum). Many of the papers presented in Quantum Well Intersubband Transition Physics and Devices are on the basic linear intersubband transition processes, detector physics and detector application, reflecting the current state of understanding and detector applications, where highly uniform, large focal plane arrays have been demonstrated. Other areas are still in their early stages, including infrared modulation, harmonic generation and emission.
Book Synopsis Spatially Indirect Excitons in Coupled Quantum Wells by : Chih-Wei Eddy Lai
Download or read book Spatially Indirect Excitons in Coupled Quantum Wells written by Chih-Wei Eddy Lai and published by . This book was released on 2004 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Intersubband Transitions in Quantum Wells: Physics and Device Applications II by :
Download or read book Intersubband Transitions in Quantum Wells: Physics and Device Applications II written by and published by Academic Press. This book was released on 1999-10-27 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Electrons at Intersubband Excitation in Asymmetric Tunnel-Coupled Quantum Well Structure by : E. A. Zibik
Download or read book Dynamics of Electrons at Intersubband Excitation in Asymmetric Tunnel-Coupled Quantum Well Structure written by E. A. Zibik and published by . This book was released on 2001 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present investigations of the intersubband electron dynamics in asymmetric tunnel-coupled GaAs/AlGaAs quantum wells. The study is performed by time resolved pump and probe experiments. Temporal evolution of the bleaching signals has biexponential behaviour. In addition to the time of the relaxation into the ground state with LO-phonon emission a second long decay time depending on transition energy and temperature is observed. We associate the second recovery time with transitions between confined F-state of quantum wells and states in the barriers including Xz-states which appear due to high content of Al. The influence of the transitions between subbands with energy separation less than optical phonon energy on the relaxation processes is also discussed.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Excitons in Coupled Double Quantum Wells by : Sang Yup Kim
Download or read book Excitons in Coupled Double Quantum Wells written by Sang Yup Kim and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantum Well Above-barrier States and Short Wavelength Intersubband Transitions in InGaAs/A1GaAs Quantum Wells by : Baegin Sung
Download or read book Quantum Well Above-barrier States and Short Wavelength Intersubband Transitions in InGaAs/A1GaAs Quantum Wells written by Baegin Sung and published by . This book was released on 1998 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Light-Induced Drift of Electrons in Coupled Quantum Wells by :
Download or read book Theory of Light-Induced Drift of Electrons in Coupled Quantum Wells written by and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theory of the new effect of light-induced drift (LID) in coupled potential wells is developed on the basis of the density-matrix method. The effect appears when light excites intersubband electronic transitions. LID manifests itself as the photocurrent of the 2-d electron gas in the well plane, which depends on coherent electron tunneling between the coupled wells. The theory shows the effect to possess distinctive features such as a characteristic antisymmetric spectral contour consisting of four alternating positive and negative peaks and the change of sign of the LID current with the sign change of the bias normal to the quantum-well plane. The quantitative estimates for GaAs wells show the LID current to be readily detectable. COUPLED QUANTUM WELLS, DENSITY MATRIX, LIGHT-INDUCED DRIFT, INTERSUBBAND TRANSITIONS, ELECTRONS, PHOTOCURRENT IN WELL PLANE.
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physics Of Semiconductors, The - Proceedings Of The 22nd International Conference (In 3 Volumes) by : David J Lockwood
Download or read book Physics Of Semiconductors, The - Proceedings Of The 22nd International Conference (In 3 Volumes) written by David J Lockwood and published by World Scientific. This book was released on 1995-01-20 with total page 2858 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings review the progress in most aspects of semiconductor physics, including those related to materials, processing and devices. The conference continues the tradition of the ICPS series and these volumes include state-of-the-art lectures. The plenary and invited papers address areas of major interest.These volumes will serve as excellent material for researchers in semiconductor physics and related fields.
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
