Tunneling through a coherent quantum antidot molecule

We report experiments on resonant tunneling through a quantum antidot in fr actional quantum Hall regime. The envelope of the conductance peaks indicat es tunneling via two resonant states, one of them bound on the lithographic antidot, the other on a hill of disorder potential. Moreover, our analysis indicates large coherent coupling between the two states, thus giving evid ence for an 'antidot molecule'. (C) 2000 Elsevier Science B.V. All rights r eserved.