Gate-dependent spectral functions and many-body effect for a triple dot structure

Xiong, Yong‐Chen; Zhao, Wen-Lei; Luo, Shijun

doi:10.1016/j.spmi.2017.05.023

Cited by 1 publication

(2 citation statements)

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“…This behavior is similar to the case where the energy level goes through the intermediate valence regime in multiquantum dot systems. [45][46][47][48] Now we study the charge transport through the PTQD. In Fig.…”

Section: Effect Of T T T In the Empty Regimementioning

confidence: 99%

“…When t = 0, our NRG results show n i ≈ 0.74 and S 1 S 2 ≈ −0.10, thus two of the dots are singly occupied, while the remaining one is nearly empty. The ground state of the system is considered as a magnetic-frustration phase, [45,48] and the antiferromagnetic spin-spin correlation is resulted from the following fact: comparing with the Kondo regime where N tot ≈ 3.0, the possibilities of each dot being singly occupied is weakened in the regime N tot ≈ 2.0. This tendency may result in a reduction of the RKKY interaction, which is mediated by the Kondo coupling between conduction leads and quantum dots and favors parallel spin alignment between different dots.…”

Section: Effect Of T T T In the Doubly Occupied Regimementioning

confidence: 99%

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Phase transition and charge transport through a triple dot device beyond the Kondo regime

Xiong¹,

Zhu²,

He³

2018

Chinese Phys. B

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Semiconductor quantum dot structure provides a promising basis for quantum information processing, within which to reveal the quantum phase and charge transport is one of the most important issues. In this paper, by means of the numerical renormalization group technique, we study the quantum phase transition and the charge transport for a parallel triple dot device in the strongly correlated limit, focusing on the effect of inter-dot hopping t beyond the Kondo regime. We find the quantum behaviors depend closely on the initial electron number on the dots, and the present model may map to single, double, and side-coupled impurity models in different parameter spaces. An orbital spin-1/2 Kondo effect between the conduction leads and the bonding orbital, and several magnetic-frustration phases are demonstrated when t is adjusted to different regimes. To understand these phenomena, a canonical transformation of the energy levels is given, and important physical quantities with respect to increasing t and necessary theoretical discussions are shown.

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Section: Effect Of T T T In the Empty Regimementioning

confidence: 99%

Section: Effect Of T T T In the Doubly Occupied Regimementioning

confidence: 99%