Atomically Thin Resonant Tunnel Diodes built from Synthetic van der Waals Heterostructures

Vertical integration of two-dimensional van der Waals materials is predicted to lead to novel electronic and optical properties not found in the constituent layers. Here, we present the direct synthesis of two unique, atomically thin, multi-junction heterostructures by combining graphene with the monolayer transition-metal dichalocogenides: MoS2, MoSe2, and WSe2.The realization of MoS2-WSe2-Graphene and WSe2-MoSe2-Graphene heterostructures leads toresonant tunneling in an atomically thin stack with spectrally narrow room temperature negative differential resistance characteristics

Judd on Phenomena

Donald Judd’s 1964 essay 'Specific Objects' probably remains his most well-known. In it, he described new artworks characterized by, among other features, 'a quality as a whole' instead of conventional 'part-by-part structure,' the 'use of three dimensions' and 'real space' as opposed to depiction, 'new materials [that] aren’t obviously art,' and the unadorned appearance and 'obdurate identity' of materials as they are. Judd held that the 'shape, image, color and surface' of these objects were more 'specific,' that is to say, 'more intense, clear and powerful,' than in previous art. While these positions demonstrate Judd’s subjective preferences as an artist and art critic, they also convey some of the wider debates driving American avant-garde practices in the 1960s, such as the supposed 'insufficiencies of painting and sculpture' as mediums. Art historians tend to find such breadth appealing of course - sweeping statements bring retrospective order to what was actually haphazard and unruly. But Judd knew that you lose much in eliminating complexity for the sake of clarity. He emphasized this point in his earlier essay 'Local History' so as to qualify the more general of his own arguments. 'The history of art and art’s condition at any time are pretty messy,' he declared. 'They should stay that way.