| Issue |
EPL
Volume 123, Number 6, September 2018
|
|
|---|---|---|
| Article Number | 67001 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/123/67001 | |
| Published online | 22 October 2018 | |
Direct and indirect exciton mixture in double quantum wells
Racah Institute of Physics, Hebrew University - Jerusalem 91904, Israel
Received: 22 May 2018
Accepted: 19 September 2018
The exciton system in double quantum wells is considered under the condition that the ground state is the spatially indirect exciton. At high pumping the growth of the exciton concentration can lead to such a significant increase of the indirect exciton energy that it becomes equal to the direct exciton energy. Then further increase of pumping leads to the formation of a mixed direct-indirect exciton phase. A rough estimate of the exciton energy in the mixed phase explains puzzling features of some recent exciton measurements. An experiment that would reveal the main characteristic features of the mixed phase is suggested.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 78.67.-n – Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures / 78.67.De – Quantum wells
© EPLA, 2018
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