Valleytronics is an experimental area in semiconductors that exploits local extrema in the electronic band structure. Wikipedia

experimental area in semiconductors that exploits local minima ("valleys") in the electronic band structure Wikidata

A proposed equivalent of electronics utilizing valleys in the valence band or conduction band structure of some semiconductors or insulators that possess multiple valleys, such as graphene, carbon nanotubes, bismuth, dichalcogenides, diamond or silicon. Wiktionary