Monolithic Integration of GaAs/InGaAs Lasers on Virtual Ge Substrates via Aspect-Ratio Trapping. - Li, J. Z.; Hydrick, J. M.; Park, J. S.; Li, J.; Bai, J.; Cheng, Z. Y.; Carroll, M.; Fiorenza, J. G.; Lochtefeld, A.; Chan, W.; Shellenbarger, Z. (Journal of The Electrochemical Society, 2009)