Coupled Quantum Wells. The compact density matrix approach and the Coupled quantum well
The compact density matrix approach and the Coupled quantum wells present unique opportunities for engineering new semiconductors with large optical nonlinearities associated with intersubband transitions in the infrared. Here, we explore the possibility of achieving ultrastrong coupling between conduction sub-band states in Si 1–x Ge x heterostructures and THz The nonlinear optical rectification (OR) in the asymmetric GaAs/Al x Ga 1−x As coupled quantum wells (CQWs) is theoretically investigated. The cavity is driven by Experimental PL and EL results reveal that coupled QWs show different optical responses due to the different variation in the Because of their quasi-two-dimensional nature, electrons in quantum wells have a density of states as a function of energy that has distinct steps, versus a smooth square root dependence that is found in bulk materials. The proposed quantum-engineered heterostructures enable efficient wave mixing at visible/NIR frequencies into ultracompact nonlinear optical devices. Request PDF | Carrier tunneling and transport in coupled quantum wells: Modeling and experimental verification | We propose an A few-cycle ultrashort laser field propagating through strongly coupled quantum wells (CQW) is numerically investigated. Additionally, the effective mass of holes in the valence band can be tuned to more closely match that of electrons in the conduction band. Indeed, when two quantum wells are coupled via The nonlinear optical rectification (OR) in the asymmetric GaAs/AlxGa1−xAs coupled quantum wells (CQWs) is theoretically investigated. The compact density matrix In particular, the tem-perature performance of THz quantum cascade lasers is postulated to be significantly enhanced using ZnO material systems due to their large optical phonon energy. These two factors lead to better perfo We design and demonstrate an asymmetric Ge/SiGe coupled quantum well (CQW) waveguide modulator for both intensity and phase modulation with Tunable enhancement of the optical rectification in coupled quantum wells provides a significant potential for its future use in high-speed optical detection and switching devices. A coupled quantum A model for diffusion of statistically-degenerate excitons in (coupled) quantum wells is proposed and analysed. In this The results show that the interface related Rashba spin splitting of the two coupled quantum wells is both smaller than that of a A coupled quantum well (CQW) with a structure in which two quantum wells with a width of 10 nm and 15 nm are separated by 11 nm barrier layers were used to separate Due to long lifetimes and high cooling rates indirect excitons in coupled quantum wells (CQWs) (Fig. It is well known, and easy to show, that a pair of quantum wells separated by a thin barrier will have two coupled states. 1 (a) and (b)) form a unique system where a cold exciton gas with We design and demonstrate an asymmetric Ge/SiGe coupled quantum well (CQW) waveguide modulator for both intensity and phase modulation with It is well known that the coupling between the two wells can be controlled effectively by tuning the structure parameters of the coupled quantum wells and remarkable second-order The use of quantum wells in semiconductor materials to confine carriers in one dimension has led to the creation of many optoelectronic devices; among these are quantum well lasers and Published: 23 January 2019 Large optical nonlinearity enabled by coupled metallic quantum wells Haoliang Qian, Shilong Li, Ching-Fu Chen, Su-Wen Hsu, Steven Edward Bopp, Qian Ma, Temperature dependences of photoluminescence (PL) spectra of two different InGaN/GaN multiple quantum wells (MQWs) were studied at different excitatio Quantum well based structures is still having a growing interest for the richness of the optical processes that can be produced. Within a microscopic approach, we derive a quantum diffusion The electron properties of two coupled quantum wells with a δ doping layer are investigated by solving simultaneous Schrödinger and Poisson equations This validation process not only confirms the model's accuracy under both coupled and uncoupled conditions but also highlights its potential applicability to quantum-well-based Coupled quantum wires One-dimensional electron transport in combination with wavefunction engineering has been proposed for the use in solid . The lower energy state of the pair has a symmetric combination of In this work, we explore the intriguing phenomena of bistability and multistability in a cavity comprising two coupled quantum wells via electron tunneling. The results show that the harmonic signal can be tuned by Here we investigate the properties of indirect excitons and their coupling interactions with direct excitons in asymmetric InGaAs double quantum wells using optical Spin relaxation times of electrons spatially separated from holes were evaluated by polarization and time resolved pump and probe reflection measurements.