TY - JOUR
T1 - Nano-imaging of intersubband transitions in van der Waals quantum wells
AU - Schmidt, Peter
AU - Vialla, Fabien
AU - Latini, Simone
AU - Massicotte, Mathieu
AU - Tielrooij, Klaas-Jan
AU - Mastel, Stefan
AU - Navickaite, Gabriele
AU - Danovich, Mark
AU - Ruiz-Tijerina, David A.
AU - Yelgel, Celal
AU - Fal'ko, Vladimir
AU - Thygesen, Kristian Sommer
AU - Hillenbrand, Rainer
AU - Koppens, Frank H. L.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
U2 - 10.1038/s41565-018-0233-9
DO - 10.1038/s41565-018-0233-9
M3 - Journal article
C2 - 30150633
SN - 1748-3387
VL - 13
SP - 1035
EP - 1041
JO - Nature Nanotechnology
JF - Nature Nanotechnology
IS - 11
ER -