We found a common material that’s been hiding a secret: its entire internal structure is twisted into a perfect screw shape.
April 13, 2026
Original Paper
The hidden ferroelectric chiral ground state of silver niobate
arXiv · 2604.09193
The Takeaway
Scientists discovered that silver niobate has a "hidden" arrangement that gives it unusual optical properties. This explains why it behaves like quartz, a discovery that went unnoticed for years.
From the abstract
Silver niobate is a conventional perovskite oxide compound, known to exhibit a rich polymorphism. Although often classified as antiferroelectric, its low-temperature structure remains unclear. Here, first-principles calculations reveal a previously overlooked and unusual rhombohedral ferroelectric phase with $R3$ symmetry that emerges as the thermodynamic ground state despite its close energetic competition among previously proposed structures. Remarkably, this phase is structurally chiral, with