  We study the charge transport properties of triangular quantum dot molecule
(TQDM) connected to metallic electrodes, taking into account all correlation
functions and relevant charging states. The quantum interference (QI) effect of
TQDM resulting from electron coherent tunneling between quantum dots is
revealed and well interpreted by the long distance coherent tunneling
mechanism. The spectra of electrical conductance of TQDM with charge filling
from one to six electrons clearly depict the many-body and topological effects.
The calculated charge stability diagram for conductance and total occupation
numbers match well with the recent experimental measurements. We also
demonstrate that the destructive QI effect on the tunneling current of TQDM is
robust with respect to temperature variation, making the single electron QI
transistor feasible at higher temperatures.
