Have you ever felt your smartphone heat up after heavy use or watched the battery drop at the worst possible moment? A big reason is the electronic circuits and memory inside the device, which consume energy and release heat as they operate. At the most basic level, computer memory stores information as 0s and 1s by controlling how easily electricity can pass through a material. If scientists can design memory that requires far less electricity, it could dramatically reduce the energy demands of phones, computers, and other electronics. A New Approach to Low Power Memory One idea aimed at solving this problem dates back to 1971, when researchers proposed the ferroelectric tunnel junction (FTJ). This type of memory depends on ferroelectricity, a property in which a material's internal electric polarization can be switched. When this polarization changes, it affects how easily current flows, allowing the device to store data.…