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

Autor: Schmidt P; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain., Vialla F; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain.; Institut Lumière Matière UMR5306, Université Claude Bernard Lyon1 - CNRS, Villeurbanne , France., Latini S; Center for Atomic-scale Materials Design, Technical University of Denmark, Kongens Lyngby, Denmark.; Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany., Massicotte M; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain., Tielrooij KJ; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain., Mastel S; CIC nanoGUNE Consolider, Donostia-San Sebastián, Spain., Navickaite G; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain., Danovich M; National Graphene Institute, University of Manchester, Manchester, UK., Ruiz-Tijerina DA; National Graphene Institute, University of Manchester, Manchester, UK., Yelgel C; National Graphene Institute, University of Manchester, Manchester, UK., Fal'ko V; National Graphene Institute, University of Manchester, Manchester, UK., Thygesen KS; Center for Atomic-scale Materials Design, Technical University of Denmark, Kongens Lyngby, Denmark., Hillenbrand R; CIC nanoGUNE Consolider, Donostia-San Sebastián, Spain.; IKERBASQUE, Basque Foundation for Science, Bilbao, Spain., Koppens FHL; ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona), Spain. frank.koppens@icfo.eu.; ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain. frank.koppens@icfo.eu.
Jazyk: angličtina
Zdroj: Nature nanotechnology [Nat Nanotechnol] 2018 Nov; Vol. 13 (11), pp. 1035-1041. Date of Electronic Publication: 2018 Aug 27.
DOI: 10.1038/s41565-018-0233-9
Abstrakt: 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.
Databáze: MEDLINE
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