Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
The development of atomically thin layers of van der Waals bonded solids with interesting optoelectronic properties has opened up new possibilities for exploring 2D physics and designing miniature photonic devices such as optical modulators, light emitters and saturable absorbers.
Australians call it sticky tape, English name it Sellotape, and some say Scotch tape. Whatever you call it, it is arguably responsible for the theme of this month's focus issue.
Graphene is no longer alone; a family of atomically thin 2D semiconductors has emerged. Optoelectronics and photonics applications are in their experimental infancy but the future holds much promise.
Fengnian Xia from Yale University shares his opinions with Nature Photonics on the status of research into 2D materials and their prospects for commercial applications.
The electronic and optical properties and the recent progress in applications of 2D semiconductor transition metal dichalcogenides with emphasis on strong excitonic effects, and spin- and valley-dependent properties are reviewed.
The recent realization that 2D layered materials could modulate light with superior performance has prompted intense research and significant advances, paving the way for realistic applications.