[208] "Interplay of strain and intermixing effects on direct-bandgap optical transition in strained Ge-on-Si under thermal annealing", C. Lee, Y.-S. Yoo, B. Ki, M. H. Jang, S. H. Lim, H. G. Song, J. H.Cho, J. Oh, and Y. H. Cho*, Scientific Reports 9, 11709 (2019).