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Volumn 80, Issue 20, 2009, Pages

Measurement of the Knight field and local nuclear dipole-dipole field in an InGaAs/GaAs quantum dot ensemble

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EID: 77954734084     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.80.205303     Document Type: Article
Times cited : (16)

References (57)
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    • The dominant mechanism for the evolution of the nuclear spins over this timescale is still under debate: both direct precession of the nuclear spins in the electronic field and electron-mediated nuclear-nuclear spin-flip processes are thought to play a role. In any case, it is in fact the electron itself that causes nuclear-spin evolution (Ref.): without an electron present only the dipole-dipole interaction is important.
    • The dominant mechanism for the evolution of the nuclear spins over this timescale is still under debate: both direct precession of the nuclear spins in the electronic field and electron-mediated nuclear-nuclear spin-flip processes are thought to play a role. In any case, it is in fact the electron itself that causes nuclear-spin evolution (Ref.): without an electron present only the dipole-dipole interaction is important.
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    • 10.1103/PhysRev.76.1259.2
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    • Ph.D. thesis, Technische Universität Dortmund, Germany
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    • -1 of that of a nucleus at the centre. Thus the average Knight-field variance is fairly narrow and weighted heavily towards the nuclei in the QD center.
    • - 1 of that of a nucleus at the centre. Thus the average Knight-field variance is fairly narrow and weighted heavily towards the nuclei in the QD center.
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    • Note that the maximum and minimum values of ρc vary slightly between Figs. with the maximum varying from -26 to -30%. This is because the measurements are taken on different measurement runs. As we have demonstrated in reference (Ref.), slight temperature variations in the bath cryostat give rise to different values of nuclear polarization decay over very long times. The behavior of the changes in polarization in this paper when a magnetic field is swept are not strongly dependent on temperature, however. Additionally, slight changes in excitation wavelength result in a change in electron spin memory preserved during energy relaxation from the wetting layer. Again, this slight variation does not affect the electron-nuclear spin dynamics here.
    • Note that the maximum and minimum values of ρ c vary slightly between Figs. with the maximum varying from - 26 to - 30 %. This is because the measurements are taken on different measurement runs. As we have demonstrated in reference (Ref.), slight temperature variations in the bath cryostat give rise to different values of nuclear polarization decay over very long times. The behavior of the changes in polarization in this paper when a magnetic field is swept are not strongly dependent on temperature, however. Additionally, slight changes in excitation wavelength result in a change in electron spin memory preserved during energy relaxation from the wetting layer. Again, this slight variation does not affect the electron-nuclear spin dynamics here.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.