Figure 5.

Normalized conductances as a function of temperature for a system consisting of two semi-infinite Rice–Mele chains attached to a quantum dot at the topological phase transition of the chains ($\tilde{V}=1$). In blue continuous $ϵ/V_2=0.1$, and in red dashed $ϵ/V_2=5\times {10}^{-5}$. In both cases, the low temperature saturation value $G/G_0=1/2$ gives evidence of fractional charges flowing in the system. The curves for $G/G_0$ are independent of the coupling to the quantum dot and of the sign of $ϵ$, for $\mu =ϵ$ and the dot in resonance with the edge mode. Notice that for small values of $ϵ/V_2$ as temperatures increases there is a kind of recombination of the fractional charges.