Laser soliton microcombs heterogeneously integrated on silicon

Chao Xiang,1, ∗ Junqiu Liu,2, ∗ Joel Guo,1 Lin Chang,1 Rui Ning Wang,2 Wenle Weng,2 Jonathan Peters,1 Weiqiang Xie,1 Zeyu Zhang,1 Johann Riemensberger,2 Jennifer Selvidge,3 Tobias J. Kippenberg,2, † and John E. Bowers1, 3, ‡ ECE Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland Materials Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA