RD spectra of 5 nm-In
As/GaAs QW under different strain ϵ
in unit of e
= 3.23 × 10
-5. The spectra are measured at room temperature and shifted vertically for clarity. The oblique lines indicate the energy positions of the transitions 1e1hh, 1e2hh, and 1e1lh in the RD spectra.