Articles tagged with Quantum Wells
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Scientists found that a thin layer of germanium-tin sandwiched between silicon-germanium-tin barriers enhances electronic charge mobility. This discovery could advance neuromorphic computing and quantum computers, as well as enable new control knobs for engineering material properties.
Scientists developed a technique to engineer LHPs with controlled size distribution of quantum wells, improving efficiency and stability in LEDs and lasers. By controlling nanoplatelets' growth, they achieved excellent energy cascades, enhancing photovoltaic performance and stability.
Researchers have developed a novel multi-step facet engineering approach for growing wurtzite-based InGaAs/InP MQW NWs with controlled size, morphology and high crystal quality. This enables the design of controllable nanowire optical cavities, allowing for tunable lasing peaks across the telecommunication O and C bands.
Researchers have developed a new engineering approach to on-chip light sources, enabling the widespread adoption of photonic chips in consumer electronics. The innovation involves growing high-quality multi-quantum well nanowires using a novel facet engineering approach, which enables precise control over the diameter and length of the...
A new graduate program at Rice University aims to equip students with skills needed to serve as leaders in quantum technology innovation. The program will provide interdisciplinary training to 30 students, combining expertise from quantum physics, optics, and nanotechnology.
Researchers developed high-capacity free-space optical links using unipolar quantum optoelectronic devices, achieving unprecedented data rates of up to 30 Gbit/s at 31-meter distances. The system's performance is resistant to weather conditions and showcases potential for fast, long-range optical links.
Researchers have demonstrated a new visible light communication system that uses a single optical path to create a multi-channel communication link over the air. The system, based on devices called multiple quantum well (MQW) III-nitride diodes, can save half the channel space, cost and power by using a single link.
A novel, simple, and extremely compact terahertz radiation source has been developed at TU Wien, enabling high intensities and small size. The technology uses resonant-tunnelling diodes and can be used in various applications such as material testing, airport security control, radio astronomy, and chemical sensors.
A study from KAUST found that interface and bandgap engineering can significantly slow down the relaxation of 'hot' electrons in semiconductors, increasing their lifetimes. This innovation has potential applications in solar cells, which could improve efficiency by reducing heat loss.
Researchers have explored the limits of light-matter coupling at the nanoscale, discovering a fundamental physical limit to subwavelength confinement. The study reveals that as light is concentrated into smaller volumes, its interaction with matter changes in ways that cannot be predicted by classical theories.
The study reveals optical response of GaInN/GaN MQWs using terahertz emission spectroscopy, enabling nano-seismology of wide-bandgap quantum devices. The technique allows monitoring of dynamic screening effects and acoustic wave beams in buried structures.
Researchers created nanophotonic cavities in a nanopatterned InGaAsP membrane, exhibiting photonic analogue of valley-Hall effect. The structure supports quantized spectrum of modes confined to the domain wall, enabling topologically controlled ultrathin light sources.
Researchers propose orbital engineering to overcome efficiency limitations in high-Al-content AlGaN quantum wells. By inclining the quantum well plane, they modify energy variations induced by orbital coupling, enhancing quantum confinement and radiative transition rates.
Researchers from Nanyang Technological University, Singapore, demonstrate a convenient way to control exciton flow between different colloidal quantum wells at room temperature through optical signals. They achieve continuous transition among three distinct exciton flow regimes with efficiencies of ~50%, ~90% and ~2%.
A new type of perovskite material eliminates lead and improves stability for next-generation solar cells. These materials have been shown to be as much as 28% efficient compared to current panels capturing only 15-18%. The new organic-inorganic hybrid structure also offers a blueprint for other functional hybrid materials.
Researchers at the University of Tokyo have introduced a new method for evaporation cooling using semiconductor quantum wells, reducing waste heat in portable electronics. Devices with this technology may be integrated into smart devices to prevent overheating issues.
The discovery of localization states in InGaN materials enables the creation of high-efficiency LEDs. Researchers have confirmed the existence of these energy minima states, which capture charge carriers and improve luminescence efficiency.
Researchers at Tohoku University discovered that terraced steps in AlGaN-based LED fabrication increase efficiency by forming micropaths of electric current. This process enhances the conversion of electrical energy to optical energy, paving the way for more efficient LEDs.
Scientists have observed intersubband transitions in few-layer 2D materials using s-SNOM, revealing a new class of materials for infrared detection and emission. The study also shows potential for compact integration with Si CMOS.
Researchers discovered that 2D cadmium telluride sheets can spontaneously fold into nanoscrolls when attached with specific organic molecules. This effect may be used in the development of new devices, including optic materials and light-emitting matrices.
A groundbreaking concept proposes using electron spins in semiconductors for information processing, enabling quantum computing and reducing energy consumption. The research team achieved long-distance spin transport in a semiconductor quantum well, controlling spin precession speed with an external gate voltage.
Researchers from Cyprus and Greece investigate Förster resonant energy transfer, a radiationless energy transmission process that promotes alternative contactless pathways for energy transfer. The study reveals the importance of understanding FRET in hybrid structures to develop novel devices with high efficiency.
Researchers successfully mapped the condensation of individual atoms in microscopic measuring beakers, known as quantum wells. This breakthrough provides key conclusions on the nature of atomic bonding and enables the study of other atoms and their interactions.
Scientists at Southeast University propose a scheme to control optical steady behavior in GaAs quantum well structures via nonradiation coherence. The study reveals multi-stability and optical bistability, with the ability to convert between these states by adjusting phase differences in polarized electric fields.
Researchers have demonstrated a novel quantum dot laser grown on silicon substrates, performing as well as similar lasers grown on their native substrates. This breakthrough enables large-scale photonic integration in an ultra low-cost platform.
Physicists have built a theoretical construct of twisted atom beams, which can have potential applications in quantum communication and atomic processes. These beams were created by solving the non-relativistic Schrödinger equation for atoms driven by a laser field.
Researchers at Rensselaer Polytechnic Institute have identified electron leakage as the culprit behind LED efficiency droop, a flaw that causes LEDs to lose up to 20% of their efficiency. The discovery may lead to new technologies to solve the problem and develop stronger LEDs.
Researchers at Kiel University have discovered a novel state of crystal matter with both compressible and incompressible properties. The discovery was made using extensive computer simulations and sheds light on the behavior of excitons, hydrogen atom-like bound states of electrons and holes.
Scientists at Berkeley Lab create two-dimensional electron gas with controlled spin state, exhibiting persistent spin helix with infinite lifetime. This discovery could lead to more efficient spin transistors and other devices.
Researchers at the University of Illinois have successfully demonstrated a microwave signal mixer made from a tunnel-junction transistor laser. The device accepts two electrical inputs and produces an optical signal that can be measured at frequencies of up to 22.7 gigahertz.
Researchers at UCSB have made a significant breakthrough in quantum physics, enabling the transmission of information 100 times faster than current methods. The discovery involves using a free-electron laser to modulate light beams and create a new type of cross modulation, allowing for fast channel changes.
Researchers developed wireless nanocrystals that emit visible light by pumping them with a nearby quantum well, improving efficiency over traditional fluorescent bulbs. The process produces white light through varying the size of quantum dots, paving the way for more efficient white-light-emitting diodes.
Researchers at USC and UT Austin have developed a device based on quantum dots that can detect infrared radiation in a crucial wavelength range. This technology has the potential to improve night vision goggles, medical sensors and environmental monitors.
The Lehigh group achieved breakthroughs in near-infrared-range (1300-nm) InGaAsN quantum well lasers using metalorganic chemical vapor deposition (MOCVD). Their findings have the potential to lead to the production of low-cost and high-performance 1300-nm VCSELs capable of a transmission rate of 10 GB per second.
Scientists at Berkeley Lab have observed a new exciton state that displays macroscopic ordering, indicating the formation of a Bose-Einstein condensate. This discovery holds promise for ultrafast digital logic elements and quantum computing devices.