%0 Journal %J Applied Physics Letters %D 2010 %T Design concepts of terahertz quantum cascade lasers: Proposal for terahertz laser efficiency improvements %A Kubis, T %A Mehrotra, Saumitra %A Klimeck, Gerhard %I AIP %N 26 %P 261106-1-261106-3 %U http://apl.aip.org/resource/1/applab/v97/i26/p261106_s1?view=fulltext %V 97 %8 11 %1 10.1063/1.3524197