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In this thesis, T junctions out of topological insulators are investigated theoretically and the occurence of (perfect) crossed Andreev reflection is shown. In recent years, effective Dirac systems recieved a lot of attention in solid state physics. These are systems whose dispersion can effectively be described by a Dirac cone, the most prominent examples beeing graphene and topological insulators (TIs). These systems exhibit intriguing phenomena---for example, TIs can host perfectly transmitted modes or, in conjunction with superconductors, Majorana zero modes.