New Link Found Between Ferroelectric Domain Walls and Superconductivity in 2D Materials
Scientists have discovered a unique link between ferroelectric domain walls and superconductivity in two-dimensional van der Waals materials. This breakthrough, credited to research by Gaurav Chaudhary from the University of Cambridge and Ivar Martin from Argonne National Laboratory, sheds light on how specific structural features in these materials enable strong electron interactions. The findings are expected to pave the way for new superconducting devices and innovative applications in the field of condensed matter physics.
Sliding Ferroelectricity and Polarisation Reversal
According to reports by phys.org, sliding ferroelectricity in certain 2D van der Waals materials, including boron nitride and transition metal dichalcogenides (TMDs), facilitates polarisation reversal under moderate electric fields. This phenomenon allows for large-scale manipulation of layer stacking, significantly impacting the material’s electronic properties. Researchers noted that domain walls—boundaries separating regions with differing orientations of ferroelectric polarisation—exhibit unique characteristics that enhance electron-phonon coupling.
Superconductivity Observed at Domain Walls
The study revealed that in materials like molybdenum ditelluride (MoTe₂), superconductivity is transiently enhanced near ferroelectric reversal transitions. This enhancement occurs within hysteresis loops where domains of varying polarisation coexist. The dynamic fluctuations in domain walls were identified as the driving mechanism for the pairing interactions required for superconductivity. It was highlighted that these conditions are exclusive to 2D TMDs, which support interlayer ferroelectricity while remaining conductive within their planes.
Future Research and Applications
Chaudhary and Martin indicated to phys.org that their findings hold potential for developing highly controllable superconducting devices. Efforts are underway to explore the systematic design of new superconductors by layering polar materials and leveraging domain wall networks in moiré systems. They also emphasised the need for further investigations to validate their theoretical models using advanced microscopic simulations.
The study has generated interest among scientists aiming to uncover unconventional mechanisms of superconductivity, marking an important step forward in understanding and utilising the properties of 2D materials.
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In a major fillip to Pakistan’s space and disaster management applications, China Thursday launched the first ever Remote Sensing Satellite-1 (PRSS-01) exclusively for Pakistan. The satellite was carried into orbit on a Kuaizhou-1A rocket from the Xichang Satellite Launch Centre in Sichuan province. PRSS-01 was injected into the intended orbit after liftoff, and all systems were declared functioning properly. The satellite will be used to support agriculture and land surveys, urban planning, emergency disaster response, as well as environmental monitoring scans for the country, and marks a new beginning in Pakistan’s ambitions of a space program. It also highlights persistent cooperation between China and Pakistan in technology associated with space science, as well as earth observation.
Earth Observation and Disaster Management
According to the official website, PRSS-01 is equipped with high-resolution imaging systems capable of providing detailed data across a wide range of civilian and governmental uses. Its uses consist of national land survey, urban planning, and real-time environmental monitoring. Crucially, it increases Pakistan’s ability to respond rapidly and efficiently when natural disasters such as floods or earthquakes occur. It is anticipated that the technology will be valuable in long-term infrastructure planning and will promote smarter, sustainable development across the country.
Strengthening Bilateral Space Cooperation
The PRSS-01 launch indicates that the strategic cooperation between China and Pakistan is deepening, in aerospace technology as well. Engineers from the two countries worked closely together throughout the development and launch processes, including substantial technological support from China. The mission will continue the spirit of collaboration evident in satellite communications and scientific payloads between China, Pakistan, and Algeria, strengthening confidence among partners.
The successful launch of PRSS-01 is not only a great leap for Pakistan in promoting national development, but also an important step towards China’s deepening cooperation with countries along the Belt & Road Initiative (BRI) and its aerospace industry transforming from being big to strong. With the launch of PRSS-01, industry expects a new era in improved satellite services for Pakistan.
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The concept of a large, hidden planet or planets lurking in the most distant regions of our solar system has been known since before Pluto’s discovery on 1930s. Originally named “Planet X,” it had been proposed to account for irregularities in Uranus’s orbit. That mystery was eventually resolved by recalculating Neptune’s mass. But in 2016, Caltech astronomers Konstantin Batygin and Mike Brown resurrected the puzzle with a new idea — Planet Nine — which was based on the bizarre orbits of distant Kuiper Belt objects. The explanation is that a huge planet far away is gravitationally pulling on these objects.
The Case for Planet Nine
According to Batygin and Brown’s observation, many of the Kuiper Belt objects don’t travel on orbits as expected. This suggests that, like the Moon (whose outward spiral from Earth is due to earth’s gravity), these distant objects are somehow being perturbed by something other than our Sun. The hypothesised Planet Nine is believed to be several times the size of Earth and orbiting out beyond Neptune. Supporting evidence are the discovery of recently detected trans-Neptunian-object with elliptical-orbits (such as 2017 OF201 ) which could have been sculpted by a massive planet.
In 2024, Brown reaffirmed confidence in the theory, stating, “There are currently no other explanations for the effects that we see.” More trans-Neptunian discoveries keep pointing toward an unknown gravitational force.
Challenges and New Clues
However, the theory faces hurdles. Other astronomers contend that there is not enough data on the Kuiper Belt to warrant a Planet Nine. Others suggest alternative explanations, such as a debris ring or even something more exotic like a small black hole. One is reduced observing time; tens of thousands of years are required for these objects so far from our planet to orbit.
Recent finds, such as the sednoid 2023 KQ14 — so elongated that it looks stable in an empty solar system — complicate the scenario even more. If Planet Nine is out there, it could be at least 500 AU away from the Sun. In the meantime, astronomers are continuing to search those huge, remote edges of our solar system using ground- and space-based telescopes.
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