Kondo effect in a triangular triple quantum dots ring with three terminals
✍ Scribed by Yu Liu; Yonghai Chen; Zhanguo Wang
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 364 KB
- Volume
- 150
- Category
- Article
- ISSN
- 0038-1098
No coin nor oath required. For personal study only.
✦ Synopsis
For a triangular triple quantum dots (TTQDs) ring with three terminals, when lowering one of the dot-lead coupling to realize the left-right (L-R) reflection symmetry coupling, the internal C 3v symmetry of the TTQDs is well preserved in the absence of many-body effect for the symmetric distribution of the dot-lead coupling on the molecular orbits. In the presence of Kondo effect, the decrement of one of the dot-lead couplings suppresses the inter-dot hopping. This happens especially for the coupled quantum dot (QD), which decouples with the other two ones gradually to form a localized state near the Fermi level. As a result, the internal dynamic symmetry of the TTQDs ring is reduced to L-R reflection symmetry, and simultaneously, the linear conductance is lifted for the new forming molecular orbit near the Fermi level.