Recent manipulations of excitons in moiré superlattices
Light can excite electron and hole pairs inside semiconducting materials. If the attraction between a negatively charged electron and a positively charged hole (the antiparticle of electron in solid state physics) is strong, they stay bound together,.....»»
Scientists create a longer-lasting exciton that may open new possibilities in quantum information science
In a new study, scientists have observed long-lived excitons in a topological material, opening intriguing new research directions for optoelectronics and quantum computing......»»
How to combat hardware Trojans by detecting microchip manipulations
Not only do security vulnerabilities lurk within software, but they can also be embedded directly into hardware, leaving technical applications open to widespread attack. For their project, the researchers took thousands of microscopic images of micr.....»»
New study opens the door to ultrafast 2D devices that use nonequilibrium exciton superdiffusion
Bound electron-hole pairs, or excitons, are the workhorses in layered transition metal dichalcogenide semiconductors. Like the negative and positive charge carriers from which it forms, the exciton exhibits great mobility that ultrafast transient dif.....»»
New class of porous metal nanoparticles will yield new capabilities in absorption, chemical sensing and separations
Researchers from Northwestern University have made a significant advance in the way they produce exotic open-framework superlattices made of hollow metal nanoparticles......»»
Valleytronics researchers fabricate novel 2D material enjoying long-life excitons
The emerging field of valleytronics, which exploits the momentum preference of excited electrons, or excitons, in a variety of optoelectronic devices, is closely tied to the fabrication of novel 2D materials just atoms thick. This month, a group of v.....»»
New class of excitons with hybrid dimensionality in layered silicon diphosphide
Researchers from Nanjing University and Beihang University in China and the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) in Hamburg, Germany, have produced a new class of exciton with hybrid dimensionality by engineering the p.....»»
Physicists shine light on solid way to extend excitons" life
Optics researchers at The University of Texas at Dallas have shown for the first time that a new method for manufacturing ultrathin semiconductors yields material in which excitons survive up to 100 times longer than in materials created with previou.....»»
Fast-moving excitons observed for first time in metal, unlocking potential to speed up digital communication
In a world first, a team co-led by a physicist at City University of Hong Kong (CityU) has discovered that excitons—excited electrons bound to empty electron "holes"—can exist stably and travel rapidly through metal. Because excitons can be gener.....»»
Scientists capture the fleeting dance of moiré excitons
Published in the journal Nature, scientists from the Okinawa Institute of Science and Technology Graduate University (OIST), SLAC National Accelerator Laboratory (SLAC), and Stanford University have, in a world-first, imaged and measured the two part.....»»
Quantifying biexciton binding energy
A rare spectroscopy technique performed at Swinburne University of Technology directly quantifies the energy required to bind two excitons together, providing for the first time a direct measurement of the biexciton binding energy in WS2......»»
Study unveils a Moiré nematic phase in twisted double bilayer graphene
Moiré superlattices are systems in which two sheets of a material are placed on top of each other with a small angle misalignment, resulting in a characteristic pattern known as the Moiré pattern. In recent years, many physicists and material scien.....»»
Predicting high temperature Bose-Einstein condensation of excitons
National University of Singapore researchers have predicted that an exotic state of matter known as a Bose-Einstein condensate can exist at relatively high temperatures (around 50 K to 100 K) in systems comprising organic molecules on two-dimensional.....»»
Towards straintronics: Guiding excitons in 2D materials
From a team of City College of New York physicists and their collaborators in Japan and Germany comes another advancement in the study of excitons—electrically neutral quasiparticles that exist in insulators, semi-conductors and some liquids. The r.....»»
Twisted-angle dependent exciton in heterobilayer of transition metal dichalcogenides
The type-II band structures in vertically stacked transition metal dichalcogenides (TMDs) heterobilayers facilitate the formation of interlayer excitons. The twist-angle and the mismatch in the lattice constants of the monolayers create a periodic mo.....»»
Synthesizing double perovskite nanocrystals with bright emission based on triplet self-trapped excitons
Different from the narrow band emission based on free excitons in lead-perovskite nanocrystals (NCs), the low electronic dimensionality in lead-free double perovskite NCs can lead to self-trapped excitons (STEs), generating a broadband emission......»»
Researchers achieve charge-order-enhanced capacitance in semiconductor moiré superlattices
In recent years, electronics engineers have been experimenting with new materials that could be used to study electronic correlation phenomena. Van der Waals (vdW) moiré materials are particularly promising for examining these phenomena. VdW materia.....»»
Optical effects of the divalent functionalization of carbon nanotubes
Scientists have learned how to place crystalline defects in new materials with atomic-scale precision. This enables materials that can control excitons—energy carriers that are similar to subatomic particles. New research shows that, by precisely a.....»»
X-ray study reveals how lead sulphide particles self-organise in real time
The structure adopted by lead sulfide nanoparticles changes surprisingly often as they assemble to form ordered superlattices. This is revealed by an experimental study that has been conducted at DESY's X-ray source PETRA III. A team led by the DESY.....»»
Interlayer exciton formation, relaxation, and transport in TMDs van der Waals heterostructures
Interlayer excitons in transition metal dichalcogenides (TMDs) van der Waals (vdW) heterostructures exhibit fascinating physics and hold great promise for developing excitonic devices. Scientists in China present a systematical and comprehensive over.....»»
High-order superlattices by rolling up van der Waals heterostructures
Two-dimensional (2D) materials and van der Waals (vdW) heterostructures are flexible materials with distinct atomic layers beyond traditional units of lattice-matching requirements. Nevertheless, the 2D van der Waals structures researchers have hithe.....»»