Here's an older article from IEEE reporting on an earlier version of the same technology - https://spectrum.ieee.org/semiconductors/devices/introducing-the-vacu

Here's an older article from IEEE reporting on an earlier version of the same technology - https://spectrum.ieee.org/semiconductors/devices/introducing-the-vacuum-transistor-a-device-made-of-nothing https://spectrum.ieee.org/semiconductors/devices/introducing... This one goes into somewhat greater technical detail.