Attractive Coulomb interactions in a triple quantum dot

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2018-06
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.97, no.24, pp.241115(R) - 241115(R)

ISSN
2469-9950
DOI
10.1103/PhysRevB.97.241115
URI
http://hdl.handle.net/10203/244315
Appears in Collection
PH-Journal Papers(저널논문)
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