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Hole spin relaxation in neutral InGaAs quantum dots: Decay to dark states
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Results of polarization-dependent time-resolved PL experiments on InGaAs QDs at . Triangles (squares) indicate the dynamics of the components of the photoluminescence under excitation with . Circles indicate results for linearly polarized excitation, in which the same linear component of the photoluminescence is detected. Inset: Selection rules for the ground state optical transition in the quantum dots, which is primarily heavy-hole in character (Refs. 25 and 26). The states indicate the total angular momentum projection of the exciton spin along the growth direction of the quantum dots. The degenerate optically active states are separated from the dark states by the electron-hole exchange interaction energy, which is typically (Refs. 25 and 26) and has been exaggerated for clarity. Single-particle hole and electron spin flip transitions, which connect dark and bright exciton states, are indicated by dashed lines.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Time dependence of the ratio . The decay of to unity indicates spin relaxation of holes in the QDs. The exponential fit (solid curve) indicates a decay time of . Inset: Same data for larger optical time delays. (b) Decay of the degree of circular polarization , indicating the spin dynamics of electrons in the QDs. The exponential fit (solid curve) provides a decay time of . Inset: Temperature dependence of the exponential fit results for .

Image of FIG. 3.
FIG. 3.

Temperature dependence of the initial value of (extrapolated to zero time delay) obtained from the exponential fit results.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hole spin relaxation in neutral InGaAs quantum dots: Decay to dark states