Logical inversion

It seems to defy logic but turning a material upside down can make it software, according to research by Gustau Catalán and colleagues at the Catalan Institute of Nanoscience and Nanotechnology, ICN2, a non-profit near Barcelona, Spain. The team has demonstrated how the interaction of localized flexoelectric polarization and piezoelectric polarization inherent in polar crystals can make it harder to indent the material - uniaxial ferroelectric lithium niobate - depending on the direction of the indentation or whether or not a voltage is being applied.