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Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot | | Benoît Eble
; Olivier Krebs
; Aristide Lemaître
; Katarzyna Kowalik
; Arkadiusz Kudelski
; Paul Voisin
; Bernhard Urbaszek
; Xavier Marie
; Thierry Amand
; | | Date: |
11 Aug 2005 | | Subject: | Other | cond-mat.other | | Affiliation: | LPN), Olivier Krebs (LPN), Aristide Lemaître (LPN), Katarzyna Kowalik (LPN, FUW), Arkadiusz Kudelski (LPN), Paul Voisin (LPN), Bernhard Urbaszek (LNMO), Xavier Marie (LNMO), Thierry Amand (LNMO | | Abstract: | We report on the dynamic nuclear polarization of a single charge-tunable self-assembled InAs/GaAs quantum dot in a longitudinal magnetic field of $sim$0.2T. The hyperfine interaction between the optically oriented electron and nuclei spins leads to the polarization of the quantum dot nuclei measured by the Overhauser-shift of the singly-charged excitons ($X^{+}$ and $X^{-}$). When going from $X^{+}$ to $X^{-}$, we observe a reversal of this shift which reflects the average electron spin optically written down in the quantum dot either in the $X^{+}$ state or in the final state of $X^{-}$ recombination. We discuss a theoretical model which indicates an efficient depolarization mechanism for the nuclei limiting their polarization to ~10%. | | Source: | arXiv, cond-mat/0508281 | | Services: | Forum | Review | PDF | Favorites | |
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