Optical investigations on single vertically coupled InP/GaInP quantum dot pairs
| Autor: | E. Koroknay, Peter Michler, Heinz Schweizer, C. A. Kessler, Robert Roßbach, Michael Jetter, M. Reischle |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Coupling
Materials science business.industry Physics::Optics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Quantum dot laser Quantum dot Optoelectronics Molecule Photoluminescence excitation business Ground state Spectroscopy Quantum tunnelling |
| Zdroj: | physica status solidi (b). 249:747-751 |
| ISSN: | 0370-1972 |
| DOI: | 10.1002/pssb.201200004 |
| Popis: | Single vertically stacked pairs of InP quantum dots (QDs) with different interdot barrier width are investigated using microphotoluminescence, photoluminescence excitation spectroscopy and time-resolved techniques. The results indicate unidirectional carrier tunneling to be the main coupling mechanism between the two layers containing QDs with intentionally different size. The coupling is changing from electron–hole tunneling to electron tunneling and finally vanishing tunneling with increasing barrier size. Two QDs of different size form an asymmetric QD molecule with different ground state energies of the composing single QDs. Carriers can tunnel from the small dot to the large dot depending on the interdot spacer thickness dsp. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text