Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-05-14
Phys. Rev. Lett., 87, 186801 (2001).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures. Typos corrected, minor changes for clarity. Accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.87.186801
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 $g$ is sensitive to interference between trajectories which enter the dot and those which bypass it. We show that including an intra-dot 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 $\Delta$. The result is large oscillations of $g$ as a function of the voltage applied to a gate capacitively coupled to the dot. Without interactions, the conductance has only a weak interference signature when $T>\Delta$.
Ambegaokar Vinay
Brouwer Piet. W.
Clerk Aashish A.
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