Tiny whirlpools found in atom‑thin semiconductor

Monash University‑led researchers have captured the first direct images of nanoscale swirling structures—merons and antimerons—within an atomically thin semiconductor. Published in *Science Advances*, the study demonstrates that these whirlpools of electrical polarization can be engineered in twisted layers of tungsten diselenide (WSe₂), a two‑dimensional material known for its exceptional electronic properties. The imaging was achieved using advanced scanning probe techniques that resolve the minute magnetic textures associated with the merons and antimerons, confirming theoretical predictions about their existence in twisted van der Waals heterostructures.

The discovery is significant because merons and antimerons represent topologically protected states that can store and manipulate information with minimal energy dissipation. By demonstrating that these structures can be stabilized in a commercially relevant semiconductor, the research opens a pathway toward ultra‑low‑power electronic devices, such as racetrack memories and neuromorphic circuits, that rely on the controlled motion of magnetic vortices. The twisted‑layer configuration used in the experiment also suggests that strain and interlayer coupling can be fine‑tuned to optimize the stability and mobility of these topological excitations.

Looking ahead, the ability to image and control meron‑based textures in WSe₂ could accelerate the development of next‑generation spintronic and valleytronic technologies. The study provides a crucial experimental benchmark for designing devices that exploit the unique interplay between topology, magnetism, and two‑dimensional material science, potentially leading to more efficient, scalable, and versatile electronic components.