Single-electron charging in a parallel dot structure
T. H. Wang, Y. Aoyagi · Applied Physics Letters · 2001
A parallel dot structure, which is not conductively coupled but capacitively coupled, is fabricated. Both of the respective single dots show clear Coulomb blockade oscillations (CBOs) as their gate voltages are scanned. Single-electron charging in one dot causes oscillations of the current through another dot, even in the regime of more negative gate voltages where the CBOs cannot be observed due to a too weak current. In addition, information on the energy levels in one dot can be obtained.