Nano-imaging of intersubband transitions in van der Waals quantum wells

Nature Nanotechnology
Peter SchmidtFrank H L Koppens

Abstract

The science and applications of electronics and optoelectronics have been driven for decades by progress in the growth of semiconducting heterostructures. Many applications in the infrared and terahertz frequency range exploit transitions between quantized states in semiconductor quantum wells (intersubband transitions). However, current quantum well devices are limited in functionality and versatility by diffusive interfaces and the requirement of lattice-matched growth conditions. Here, we introduce the concept of intersubband transitions in van der Waals quantum wells and report their first experimental observation. Van der Waals quantum wells are naturally formed by two-dimensional materials and hold unexplored potential to overcome the aforementioned limitations-they form atomically sharp interfaces and can easily be combined into heterostructures without lattice-matching restrictions. We employ near-field local probing to spectrally resolve intersubband transitions with a nanometre-scale spatial resolution and electrostatically control the absorption. This work enables the exploitation of intersubband transitions with unmatched design freedom and individual electronic and optical control suitable for photodetectors, light...Continue Reading

References

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Citations

Jan 9, 2020·Nature Communications·Johanna ZultakRoman Gorbachev
Oct 6, 2019·Nature Communications·Benjamin T DirollRichard D Schaller
Mar 8, 2019·Nature·Bernhard Urbaszek, Ajit Srivastava
Nov 20, 2019·Nature Nanotechnology·Tomojit ChowdhuryThomas J Kempa
Mar 2, 2019·Physical Review Letters·Nicholas RiveraIdo Kaminer
Dec 23, 2020·Nanomaterials·Fabien Vialla, Natalia Del Fatti
May 15, 2021·Nature Communications·Mark Kamper SvendsenKristian S Thygesen
Jul 17, 2021·Nature Nanotechnology·Gangtae JinMoon-Ho Jo
Nov 13, 2021·The Journal of Physical Chemistry Letters·Lifeng WangKaifeng Wu
Feb 3, 2022·Nano Letters·Elena BlundoAntonio Polimeni

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Methods Mentioned

BETA
transition
electron microscopy
infrared diffraction
AFM

Software Mentioned

SNOM

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