1. A chalcogenide device comprising: a chalcogenide material having a plurality of structural states, said structural states including accumulation states and greyscale states; a first terminal in electrical communication with said chalcogenide material; a second terminal in electrical communication with said chalcogenide material; a third terminal in electrical communication with said chalcogenide material; wherein said chalcogenide material includes a first portion in a first structural state and a second portion in a second structural state, said first and second structural states being selected from among said accumulation states or said greyscale states.