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Volume 13 Issue 11, November 2018

Probing intersubbands in 2D materials

The device operation of quantum-well infrared photodetectors and quantum-cascade lasers rely on intersubband transitions — that is, transitions that occur between quantized states in quantum wells that are typically fabricated from different III–V semiconductor alloys. The combination of materials in these structures is limited by strict lattice-matching conditions, which may deteriorate the device performance. Owing to their design versatility, van der Waals quantum wells naturally formed in 2D materials heterostructures are not impaired by these restrictions. However, until now, intersubband transitions in van der Waals quantum wells have not been observed experimentally. Now, Schmidt et al. employ near-field local probing to spectrally resolve intersubband transitions in layered transition metal dichalcogenides (TMDs) providing the opportunity to study these phenomena in van der Waals quantum wells for future applications. The cover is the artist’s depiction of an optically excited van der Waals layered structure formed by terraced TMDs.

See Koppens et al.

Image: Fabien Vialla. Cover Design: Sam Whitham

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