Abstract
We study the conductance of a quantum “T junction” coupled to two electron reservoirs and a quantum dot. In the absence of electron-electron interactions, the conductance is sensitive to interference between trajectories which enter the dot and those which bypass it. We show that including an intradot charging interaction has a marked influence: it can enforce a coherent response from the dot at temperatures much larger than the single-particle level spacing . The result is large oscillations of as a function of the voltage applied to a gate that is capacitively coupled to the dot. Without interactions, the conductance has only a weak interference signature when .
- Received 15 May 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.186801
©2001 American Physical Society