Figure 4

Singlet-triplet splitting.

(a)–(c) DC measurements of the triangle pair analysed in Fig. 3, at V_SD = −2.5 mV, for different in-plane magnetic fields, B (scale bar same as Fig. 3(b)). The singlet–triplet splitting, Δ_ST, is defined by the triplet and singlet state of (0,2) as depicted in (a). As the magnetic field increases, Δ_ST decreases along the detuning axis of the triangle [labeled in (b)]. (d) The energy spacing Δ_ST as a function of in-plane magnetic field B. Δ_ST decreases at a rate ∼ 0.12 meV/T and is expected to approach zero at 11.3 T. From the linear fit (red line) through Δ_ST, the g-factor is 2.1 ± 0.2.