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 ⟩ (u = ↑, d = ↓) and spin correlation between dots i and j ⟨ S i S j ⟩ as functions of interdot tunnel coupling t at zero temperature. Here, Γ = 0.01, U = 0.1, V = 0.15, and ε = − U /2–2 V .