Spin-selective optical absorption of singly charged excitons in a quantum dot

Alexander Högele, Martin Kroner, Stefan Seidl, Khaled Karrai, Mete Atatüre, Jan Dreiser, Atac Imamoǧlu, Richard J. Warburton, Antonio Badolato, Brian D. Gerardot, Pierre M. Petroff

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


We report high resolution laser absorption spectroscopy of a single InGaAsGaAs self-assembled quantum dot embedded in a field-effect structure. We show experimentally that the interband optical absorption to the lower Zeeman branch of the singly charged exciton is strongly inhibited due to spin (Pauli) blockade of the optical transition. At high magnetic fields the optical absorption to the upper Zeeman branch dominates the absorption spectrum. We find, however, that the spin blockade is not complete and a 10% leakage remains at high magnetic fields. Applying a gate voltage to empty the dot of its resident electron turns the spin blockade off. This effect is observed at 1.5 K and up to 9 T. © 2005 American Institute of Physics.

Original languageEnglish
Article number221905
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number22
Publication statusPublished - 30 May 2005


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