Quantum phase transition and Coulomb blockade effect in triangular quantum dots with interdot capacitive and tunnel couplings*
Xiong Yong-Chena)†, Wang Wei-Zhongb),c), Yang Jun-Taoa), Huang Hai-Minga)
       
(a) Total charge of three dots n , (b) double occupation of each dot ⟨ n iu n id ⟩ and (c) spin correlation between dots i and j ⟨ S i S j ⟩ as functions of charge energy ε for t = 0 (solid line), t = 0.01 (dashed line), and t = 0.08 (dotted line). The remaining parameters are give by Γ = 0.01, U = 0.1, and V = 0.15.