Attractive Coulomb interactions in a triple quantum dot

Abstract

Electron pairing due to a repulsive Coulomb interaction in a triple quantum dot (TQD) is experimentally studied. It is found that electron pairing in two dots of a TQD is mediated by the third dot, when the third dot strongly couples with the other two via Coulomb repulsion so that the TQD is in the twofold degenerate ground states of (1, 0, 0) and (0, 1, 1) charge configurations. Using the transport spectroscopy that monitors electron transport through each individual dot of a TQD, we analyze how to achieve the degeneracy in experiments, how the degeneracy is related to electron pairing, and the resulting nontrivial behavior of electron transport. Our findings may be used to design a system with nontrivial electron correlations and functionalities.

arXiv comment5 pages, 5 figures

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• Bias-induced chiral current and topological blockadein triple quantum dots
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• Quantum criticality and formation of a singular Fermi liquid in the attractive SU(N > 2) Anderson model
• Accurately heat flow distribution based on a triple quantum dot
• A non-local cryogenic thermometer based on Coulomb-coupled systems
• Transport through strongly correlated triple quantum dot
• Fast raster scan multiplexed charge stability measurements toward high-throughput quantum dot array calibration
• Fractional shot noise of an SU(N) Kondo system