The smallest solid-state ferroelectricity: 5,000 atoms will suffice

https://phys.org/news/2024-02-atoms-smallest-solid-state-ferroelectricity.html

"small traditional ferroelectrics' depolarization field cause original polarization characteristics disappear, hindering ferroelectric materials in high-density storage devices... tungsten disulfide nanotube interface with ≅5K atoms resist change and hysteresis phenomena in ferroelectric diodes due to lattice slip at interface, enabling resistance changes suitable for information storage and programmable photovoltaic responses across almost entire visible light range... high-density information storage, smaller ferroelectric devices"