AlInAsSb Impact Ionization Coefficients IEEE Photonics Technology Letters 02/15/2019 10486799 10.1109/LPT.2019.2894114 IEEE Photonics Technology Letters 1041-1135 31 4 Yuan YuanJiyuan ZhengAnn K. RockwellStephen D. MarchSeth R. BankJoe C. Campbell