Scientists Develop Technique for Ultra-Thin Quantum Material Stacks

Scientists have introduced a polymer-free fabrication method for 2D heterostructures—materials only a few atoms thick—aimed at making quantum and nanoelectronic devices cleaner and more controllable. The approach, developed by teams at the University of Southampton and the National University of Singapore, targets one of the biggest practical bottlenecks in the field: unwanted contamination from conventional assembly techniques.

Most current workflows build layered 2D stacks using sticky synthetic polymers to hold atomically thin crystals in place. While effective, polymer residues can remain trapped at interfaces, subtly altering electronic behavior and masking the intrinsic properties researchers are trying to measure.

Instead of polymers, the researchers used muscovite, a natural mineral commonly known as mica, as the stacking platform. Because mica is inorganic and crystalline, it provides atomically flat surfaces and reduces the formation of microscopic debris at the critical interfaces between different 2D layers.

In experiments, substituting polymers with mica produced heterostructures with significantly improved surface cleanliness and flatness. The result is a more reliable physical foundation for creating precisely aligned layered systems, where the relative twist angle between components strongly determines electronic and quantum phenomena.

The team emphasizes that controlled alignment is essential for engineered states such as exotic superconductivity and tunable magnetism, which emerge in carefully constructed 2D stacks. Even tiny amounts of contamination can suppress or obscure these effects, making interface purity a decisive requirement for reproducible quantum-material experiments.

Lead author Dr Makars Šiškins notes that the method is not only cleaner but also potentially cheaper, lowering the barrier for high-precision device assembly. He argues that improved alignment and cleanliness open the door to complex heterostructures that were previously too challenging to manufacture routinely.

Co-lead Prof Alexey Berdyugin adds that mica’s crystalline nature avoids many of the contamination issues associated with soft polymer layers. By enabling ultra-clean electronic interfaces, the technique helps components operate closer to their full designed potential.

The study was published in Nature Communications and appears as part of a broader push toward fabrication strategies that can support the next generation of quantum processors and faster, more dependable nanoelectronics. If adopted widely, polymer-free van der Waals assembly could accelerate both fundamental research and the engineering of future quantum technologies.