Researchers from Fusain University and the Chinese National University of Defense Technology demonstrated that 2D all-dielectric PhC slabs without in-plane inversion symmetry can be used to efficiently separate valley exciton emission of a 2D WS2 monolayer in the far field at room temperature.
Researchers from the University of California, Riverside, has observed light emission intervalley transmissions. The researchers say that this light emission can be used to read valley information from Valleytronics devices in the future.
The researhers observed the phenomenon in monolayer tungsten diselenide (WSe2) - a promising valleytronic material that possesses two valleys with opposite dynamic characteristics in the band structure, and can interact strongly with light.
Researchers from the University of Groningen managed to produce valley-coherent photoluminescence at room temperatures - by using a silver sawatooth nanoslit array in two-dimensional tungsten disulfide flakes.
Researchers from the University of California, Riverside,have developed a new method to read the valley indices of the dark excitons and trions. The researchers used monolayer (2D) tungsten diselenide (WSe2), a semiconductor with two distinct electronic valleys.The material hosts bright and dark excitons or trions with different spin configurations.
The International Institute of Physics in Brazil recently uploaded this interesting talk by Stephan Roche from the ICREA and CINN who discusses valleytronics in 2D materials (such as graphene):
Researchers from Korea's Daegu Gyeongbuk Institute of Science and Technology (DGIST) discovered the formation of valley domain, which can expand valleytronics technology.
The researchers say that they have solved the stability problem inherent in valley spin in valleytronics devices by discovering the formation of valley domain in 2D molybdenum disulfide (MoS2). The team identified that a valley domain formed in an extreme nano structure can be used to store information in place of spin.
Researchers from EPFL's Laboratory of Nanoscale Electronics and Structures (LANES) developed a new way to control the valley properties of excitons and change the polarization of the light they generate.
Excitons, or electron and electron hole pairs, are created when an electron absorbs light and moves into a higher energy band. To research the excitons, the researchers used a material made from tungsten diselenide (WSe2) and molybdenum diselenide (MoSe2), and a circular polarized laser that was focused on the film.
Researchers from Penn State University developed a topological valley valve, which controls electron flow. Using electron "beam splitters", the researchers achieved high-level of electron control.
Using bilayer graphene, the researcher created electron waveguides created by gates defined with extreme precision using state-of-the-art electron beam lithography.By controlling the topology of the waveguides (the valley-momentum locking of the electrons), the researchers can control electron flow.
The US National Science Foundation (NSF) has allocated $20-25 million for a new six year program called "Enabling Quantum Leap: Convergent Accelerated Discovery Foundries for Quantum Materials Science, Engineering, and Information" (Q-AMASE-i).
Q-AMASE-i encompasses many clases of materials, includings ones that explore the paradigms or spintronics, hybrid 2D materials - and Valleytronics.
Researchers from Princeton University observed that electrons in bismuth prefer to crowd into one valley rather than distributing equally into the six available valleys. This behavior creates a type of electricity called ferroelectricity, which involves the separation of positive and negative charges onto opposite sides of a material.