Attribution of spatial parameter variations to specific microscopic causes

Ascertain the dominant microscopic mechanism(s) responsible for the spatial variations of the exciton lifetime T1, the fine‑structure splitting δ, the quantum‑beat dephasing time T2* and the peak differential transmission ΔT/T observed in the 1×1‑mm² ASOPS mapping of the InAs quantum‑dot resonator sample by decoupling superimposed contributions from dielectric distributed‑Bragg‑reflector surface/interface roughness, dislocations, and resonator‑thickness variations.

Background

The mapping revealed modest but systematic spatial inhomogeneities in several extracted parameters across a 1×1‑mm² field of view. The authors discuss multiple plausible structural contributors—including dielectric DBR surface/interface roughness, dislocations, and cavity‑thickness fluctuations—that could influence these parameters.

However, because these effects may act simultaneously, the present data do not allow a unique attribution, leaving unresolved which mechanism(s) chiefly govern the observed spatial distributions.

References

Because these effects are superimposed, the observed distributions cannot be unambiguously attributed to a single cause.

— Spatial mapping of quantum-dot dynamics across multiple timescales at low temperature using remote asynchronous optical sampling  (2604.03041 - Asambo et al., 3 Apr 2026) in Subsubsection "Discussion of parameter distributions," Section "Mappings of parameters"