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Intersubband Transition Engineering in the Conduction Band of Asymmetric Coupled Ge/SiGe Quantum Wells
- Source :
- Crystals, Volume 10, Issue 3, Crystals, Vol 10, Iss 3, p 179 (2020)
- Publication Year :
- 2020
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2020.
-
Abstract
- n-type Ge/SiGe asymmetric coupled quantum wells represent the building block of a variety of nanoscale quantum devices, including recently proposed designs for a silicon-based THz quantum cascade laser. In this paper, we combine structural and spectroscopic experiments on 20-module superstructures, each featuring two Ge wells coupled through a Ge-rich SiGe tunnel barrier, as a function of the geometry parameters of the design and the P dopant concentration. Through a comparison of THz spectroscopic data with numerical calculations of intersubband optical absorption resonances, we demonstrated that it is possible to tune, by design, the energy and the spatial overlap of quantum confined subbands in the conduction band of the heterostructures. The high structural/interface quality of the samples and the control achieved on subband hybridization are promising starting points towards a working electrically pumped light-emitting device.
- Subjects :
- Silicon
Materials science
Terahertz radiation
General Chemical Engineering
FOS: Physical sciences
chemistry.chemical_element
02 engineering and technology
01 natural sciences
Germanium heterostructures
law.invention
Inorganic Chemistry
law
intersubband transitions
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
lcsh:QD901-999
General Materials Science
010306 general physics
Absorption (electromagnetic radiation)
Quantum
silicon–germanium heterostructures
Quantum well
Condensed Matter - Materials Science
Settore FIS/03
Condensed Matter - Mesoscale and Nanoscale Physics
Dopant
business.industry
Materials Science (cond-mat.mtrl-sci)
Heterojunction
021001 nanoscience & nanotechnology
Condensed Matter Physics
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter - Other Condensed Matter
quantum wells
chemistry
THz spectroscopy
Optoelectronics
lcsh:Crystallography
0210 nano-technology
business
Quantum cascade laser
Group IV epitaxy
Intersubband transitions
Quantum wells
group IV epitaxy
Other Condensed Matter (cond-mat.other)
Subjects
Details
- Language :
- English
- ISSN :
- 20734352
- Database :
- OpenAIRE
- Journal :
- Crystals
- Accession number :
- edsair.doi.dedup.....a888a6652bc405a96327336931abbadf
- Full Text :
- https://doi.org/10.3390/cryst10030179