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Sample structure and PL data. (a) Schematic of the sample structure: the dotted line indicates the location of the -doping. (b) Level structure: represents the F-bound-electron manifold, while represents the F-bound-exciton manifold. Excitation occurs through above-band pumping, with fast nonradiative relaxation into the bound-exciton ground states. Radiative decay into the ground state is indicated by . Insets: schematic illustration of the bound electron and bound-exciton complexes. (c) Mesa structure (100 nm diameter, 3 nm QW) PL. FE-HH and FE-LH represent the heavy and light hole free-exciton emission, while indicates the bound-exciton decay into the electron ground state.
Coincidence counts [cts] vs time delay for (a) a 3 nm QW, 100 nm mesa, and (b) a 1 nm QW, 100 nm mesa. Normalized peak values (1 ns integration window, random detector noise subtracted) are indicated above the peaks. Note the -dip, denoting antibunching, and the repetition rate of 13 ns or 76 MHz.
Single-emitter magneto-PL data for 200 nm diameter mesas (3 nm QW). (a) Energy spectrum in Faraday geometry (: bound exciton; : bound electron; HH: heavy hole; and LH: light hole). (b) PL as function of the magnetic field, in Faraday geometry (inset: sample and field alignment in Faraday geometry). (c) Energy spectrum in Voigt geometry; note the two -systems with distinct polarization selection rules. (d) PL as function of the magnetic field in Voigt geometry (inset: sample and field alignment).
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