UV modulation by twisting crystal films
Films of the two-dimensional material hexagonal boron nitride can be used to control light emission from materials, according to the Singapore-MIT Alliance for Research and Technology (Smart).
The phenomenon involves the creation of ‘Moiré superlattices’ as two films are rotated with respect to one-another, and works at room temperature with films made from stacks of atoms around 100nm high – considered bulk materials and easier to manipulate than single-atom layers.
It was examined using ultra-violet cathodoluminescence in a scanning transmission electron microscope.
“A number of new physical phenomena, such as unconventional superconductivity, have been discovered recently by stacking individual layers of atomically-thin materials on top of each other at a twist angle, which results in the formation of what we call Moiré superlattices,” said Smart investigator Professor Silvija Gradecak. “Existing methods focus on stackin
SMART Breakthrough in Materials Discovery Enables ‘Twistronics’ for Bulk Systems
Written by AZoNanoApr 22 2021
Researchers from the Low Energy Electronic Systems (LEES) Interdisciplinary Research Group (IRG) at Singapore-MIT Alliance for Research and Technology (SMART), MIT’s research enterprise in Singapore together with Massachusetts Institute of Technology (MIT) and National University of Singapore (NUS) have discovered a new way to control light emission from materials.
SMART researchers show the phenomena related to the formation of moiré superlattices observed in monolayer-based two-dimensional systems can be translated to tune optical properties of three-dimensional, bulk-like hexagonal boron nitride, even at room temperature. Photo Credit: Nano Letters Cover, Volume 21, Issue 7
Date Time
SMART breakthrough in materials discovery enables twistronics for bulk systems
The findings allow manipulation of materials for the first time by stacking films at a twist angle, allowing a new way to control light emitting from materials
Recent discoveries focused on manipulation of atomically-thin 2D materials, while the new breakthrough can be used to stack technologically-relevant 3D materials at a twist angle
Method allows continuous, systematic control of optical emission intensity and energy, and can produce ultraviolet emissions at room temperature for bulk systems
The discovery can be significant for applications in medicine, environmental or information technologies.
Researchers from the Low Energy Electronic Systems (LEES) Interdisciplinary Research Group (IRG) at Singapore-MIT Alliance for Research and Technology (SMART), MIT’s research enterprise in Singapore together with Massachusetts Institute of Technology (MIT) and National University of Singap
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International students at Stony Brook University participating in remote learning are facing challenges due to their differing time zones.
Remote instruction has challenged many students to adjust to new learning models amidst the coronavirus pandemic. This new format offers classes that are synchronous, where students meet online for regular class times, and asynchronous, where students complete the course material on their own time. Synchronous courses in particular have posed a challenge for international students, forcing them to adopt schedules that result in irregular sleep patterns.
The university requires students to attend their synchronous courses on Eastern Standard Time, including students in different time zones across the world and country, according to the Office of Visa and Immigration Services guidelines. Others across the world must adjust to logging on nine, 12, even 14 hours ahead of Eastern Standard Time.