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(a) Electrons and holes are localised in crescent-like adiabatic potentials for a vertical quantum number . (b) A single ring structure observed by FESEM. Biexciton (XX) and excited state exciton (X N =2) emission appear near ground exciton (X N =1) for increasing excitation power (c), among which analyzer angle dependence of the PL spectrum are compared under an excitation power of 2 kWcm−2 (d).
(a) Schematic diagram of the transitions between the energy levels of the excited (EX) state, X N =1, X N =2, and XX, where each TRPL spectrum was measured for an excitation power of 1.6 kWcm−2 (b) and 6.2 kWcm−2 (c). The calculations (solid lines) are in agreement with the experimental results (dots).
(a) Temperature dependence of the PL spectrum for X N =1, X N =2, and XX with at an excitation power of 2 kWcm−2. (b) Temperature dependence of the PL energy (open) and the linewidth (filled) for X N =1, X N =2, and XX compared with theory (line).
The PL spectrum (a) and fitted peak energy (b) of localised exciton Zeeman doublet with increasing an external magnetic field, where the energy oscillation is not significant with an error range of 20 μeV after removing Zeeman splitting and diamagnetic shift (c).
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