Dynamics of bright and dark excitons in a self-assembled quantum dot
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...
| Main Authors: | , , , , , , , |
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| Format: | Conference item |
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2005
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| _version_ | 1826297536817659904 |
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| author | Dalgarno, P Ediger, M Smith, J Warburton, R Karrai, K Govorov, A Gerardot, B Petroff, P |
| author_facet | Dalgarno, P Ediger, M Smith, J Warburton, R Karrai, K Govorov, A Gerardot, B Petroff, P |
| author_sort | Dalgarno, P |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T04:33:09Z |
| format | Conference item |
| id | oxford-uuid:cf011397-b1a1-415f-9757-bc806350ce41 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:33:09Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:cf011397-b1a1-415f-9757-bc806350ce412022-03-27T07:39:30ZDynamics of bright and dark excitons in a self-assembled quantum dotConference itemhttp://purl.org/coar/resource_type/c_5794uuid:cf011397-b1a1-415f-9757-bc806350ce41Symplectic Elements at Oxford2005Dalgarno, PEdiger, MSmith, JWarburton, RKarrai, KGovorov, AGerardot, BPetroff, PWe 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. |
| spellingShingle | Dalgarno, P Ediger, M Smith, J Warburton, R Karrai, K Govorov, A Gerardot, B Petroff, P Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title | Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title_full | Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title_fullStr | Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title_full_unstemmed | Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title_short | Dynamics of bright and dark excitons in a self-assembled quantum dot |
| title_sort | dynamics of bright and dark excitons in a self assembled quantum dot |
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