We found a material that remembers things by physically growing its own body to 100 times its original size.
March 23, 2026
Original Paper
Programmable, Spontaneous Superlattice Memory in a Monolayer Topological Insulator
arXiv · 2603.19404
The Takeaway
Most computer memory uses tiny electrical or magnetic flips to store data, but this material literally changes its physical shape. By toggling between two different atomic patterns, it creates a 'superlattice' memory that stays locked in place without needing power.
From the abstract
Memory is a foundational concept across disciplines, from neurobiology and electronics to artificial intelligence and quantum gravity. In materials, memory effects typically arise from ferroic orders, such as ferroelectricity and ferromagnetism, where information is stored in charge or spin degrees of freedom. Here, we report a surprising discovery of a nonvolatile superlattice memory effect in monolayer TaIrTe4, a dual quantum spin Hall insulator, where information is encoded through sharply co