Abstract
We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. © 2005 American Institute of Physics.
Original language | English |
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Title of host publication | PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 |
Editors | J Menendez, CG VanDeWalle |
Place of Publication | MELVILLE |
Publisher | American Institute of Physics |
Pages | 645-646 |
Number of pages | 2 |
Volume | 772 |
ISBN (Print) | 0735402574, 9780735402577 |
DOIs | |
Publication status | Published - 30 Jun 2005 |
Event | 27th International Conference on the Physics of Semiconductors - Flagstaff, Arizona, Argentina Duration: 26 Jul 2004 → 30 Jul 2004 |
Conference
Conference | 27th International Conference on the Physics of Semiconductors |
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Abbreviated title | ICPS-27 |
Country/Territory | Argentina |
City | Flagstaff, Arizona |
Period | 26/07/04 → 30/07/04 |