PHASE BREAKING OF COHERENT ELECTRON WAVES IN DOT ARRAY SYSTEMS

Low temperature magneto-conductance has been studied in ballistic dot arrays using corrugation splitgates. We have obseved many peaks at low fields superimposed upon the large negative magneto-resistance in dou ble sided corrugation wires. These peaks can be considered to arise fr om three different phase breaking phenomena for coherent electron wave s in ballistic quantum dots: weak localization in the quasi-ballistic regime, periodic oscillations due to coherent interferences and electr on focusing of collimated electron waves. The three phenomena have bee n discussed in terms of their phase breaking behavior in dot arrays.