Fig. 4: Correspondence between numerical and experimental data for different couplings.

Experimental measurements of a conductance and b thermovoltage through the same device as in Fig. 3, for several values of tunneling widths \(\Gamma\). The anomalous nonzero value of the crossing point of the TR curves is denoted by an arrow (due to experimental ambiguity of reference chemical potential, the different curves were aligned so that the apparent particle-hole symmetry point is shifted to \({V}_{P}=0\)). Theoretical NRG calculations of c conductance and d thermopower through a QD with two spin-degenerate levels, with linearly varying level spacing, depicted in the inset to (d). The numerical plots were shifted horizontally so that the minima inside the valley for all plots coincided for alignment as in the experimental plots. The results also indicate a non-zero crossing point (arrow). The \(x\)-axes in c and d as well as \(\Gamma\) are in units of \(D\), half the bandwidth in the leads, and we used \(U=0.3D\).