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.
Cite
@article{arxiv.1807.08641,
title = {Attractive Coulomb interactions in a triple quantum dot},
author = {Changki Hong and Gwangsu Yoo and Jinhong Park and Min-Kyun Cho and Yunchul Chung and H. -S. Sim and Dohun Kim and Hyungkook Choi and Vladimir Umansky and Diana Mahalu},
journal= {arXiv preprint arXiv:1807.08641},
year = {2018}
}
Comments
5 pages, 5 figures