Ultra-thin van der Waals crystals as semiconductor quantum wells

Johanna Zultak, Samuel J. Magorrian, Maciej Koperski, Alistair Garner, Matthew J. Hamer, Endre Tóvári, Kostya S. Novoselov, Alexander A. Zhukov, Yichao Zou, Neil R. Wilson, Sarah J. Haigh, Andrey V. Kretinin, Vladimir I. Fal’ko () and Roman Gorbachev ()
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Johanna Zultak: University of Manchester
Samuel J. Magorrian: University of Manchester
Maciej Koperski: University of Manchester
Alistair Garner: University of Manchester
Matthew J. Hamer: University of Manchester
Endre Tóvári: University of Manchester
Kostya S. Novoselov: University of Manchester
Alexander A. Zhukov: University of Manchester
Yichao Zou: University of Manchester
Neil R. Wilson: University of Warwick
Sarah J. Haigh: University of Manchester
Andrey V. Kretinin: University of Manchester
Vladimir I. Fal’ko: University of Manchester
Roman Gorbachev: University of Manchester

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Control over the quantization of electrons in quantum wells is at the heart of the functioning of modern advanced electronics; high electron mobility transistors, semiconductor and Capasso terahertz lasers, and many others. However, this avenue has not been explored in the case of 2D materials. Here we apply this concept to van der Waals heterostructures using the thickness of exfoliated crystals to control the quantum well dimensions in few-layer semiconductor InSe. This approach realizes precise control over the energy of the subbands and their uniformity guarantees extremely high quality electronic transport in these systems. Using tunnelling and light emitting devices, we reveal the full subband structure by studying resonance features in the tunnelling current, photoabsorption and light emission spectra. In the future, these systems could enable development of elementary blocks for atomically thin infrared and THz light sources based on intersubband optical transitions in few-layer van der Waals materials.

Date: 2020
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DOI: 10.1038/s41467-019-13893-w

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