Preprint article ยท Journal article
Nano-imaging of intersubband transitions in van der Waals quantum wells
Barcelona Institute of Science and Technology1
Center for Atomic-scale Materials Design, Centers, Technical University of Denmark2
Department of Physics, Technical University of Denmark3
CIC nanoGUNE Consolider4
University of Manchester5
Computational Atomic-scale Materials Design, Department of Physics, Technical University of Denmark6
Center for Nanostructured Graphene, Centers, Technical University of Denmark7
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-emitting diodes and lasers.
Language: | English |
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Publisher: | Nature Publishing Group UK |
Year: | 2018 |
Pages: | 1035-1041 |
ISSN: | 17483395 and 17483387 |
Types: | Preprint article and Journal article |
DOI: | 10.1038/s41565-018-0233-9 |
ORCIDs: | Latini, Simone , Thygesen, Kristian Sommer , 0000-0001-7688-2511 and 0000-0001-9764-6120 |