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Volumn 81, Issue 24, 2010, Pages

Dynamics of optically induced nuclear spin polarization in individual InP/GaxIn1-xP quantum dots

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EID: 77956336882     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.81.245308     Document Type: Article
Times cited : (34)

References (62)
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    • Here we neglect hyperfine coupling of the heavy-hole spin as it is ∼10 times smaller (Ref.) than for the electron and thus leads only to minor correction of the measured BN value
    • Here we neglect hyperfine coupling of the heavy-hole spin as it is ∼ 10 times smaller (Ref.) than for the electron and thus leads only to minor correction of the measured B N value.
  • 38
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    • - -polarized excitation residual electrons in negatively charged dots and photoexcited electrons in positively charged dots have spin polarization of the same sign resulting in positive nuclear field (B N > 0) in both cases. This is due to negative circular polarization (ρ c < 0) observed in negatively charged dots while ρ c > 0 is found for positively charged dots (see Fig.). In the opposite case studied by Lai (Ref.) ρ c > 0 for both signs of the dot charging and the resulting B N has opposite signs in positively and negatively charged dots
    • - -polarized excitation residual electrons in negatively charged dots and photoexcited electrons in positively charged dots have spin polarization of the same sign resulting in positive nuclear field (B N > 0) in both cases. This is due to negative circular polarization (ρ c < 0) observed in negatively charged dots while ρ c > 0 is found for positively charged dots (see Fig.). In the opposite case studied by Lai (Ref.) ρ c > 0 for both signs of the dot charging and the resulting B N has opposite signs in positively and negatively charged dots.
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    • Measurements performed on different singly charged dots reveal very similar electron Knight fields Be ∼10mT. In case of positively charged dots Be corresponds to the effect of the photoexcited electron of the trion while in negatively charged dots Knight field is induced by the residual charge
    • Measurements performed on different singly charged dots reveal very similar electron Knight fields B e ∼ 10 mT. In case of positively charged dots B e corresponds to the effect of the photoexcited electron of the trion while in negatively charged dots Knight field is induced by the residual charge.
  • 53
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    • The effect of the electron field on nuclei is significant only if electron-spin lifetime T1e exceeds the precession period of the nuclear spin 1/ νL, determined by Larmor frequency which is νL 9 (17 )MHz/T for indium (phosphorus). The exact value of T1e in InP dots at different fields is not available. It is known however that for large enough magnetic field T1e can be on a millisecond time scale (Ref.). We thus assume that T1e 1/ νL for Bz 0.5T and the effective field experienced by nuclei equals to the instant value of Be
    • The effect of the electron field on nuclei is significant only if electron-spin lifetime T1e exceeds the precession period of the nuclear spin 1/ νL, determined by Larmor frequency which is νL 9 (17 )MHz/T for indium (phosphorus). The exact value of T1e in InP dots at different fields is not available. It is known however that for large enough magnetic field T1e can be on a millisecond time scale (Ref.). We thus assume that T1e 1/ νL for Bz 0.5T and the effective field experienced by nuclei equals to the instant value of Be.


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