Extended Data Fig. 7: Transport properties simulated for asymmetric valley g-factors in the electron and hole QDs.
From: Particle–hole symmetry protects spin-valley blockade in graphene quantum dots
a–h, Calculation of the current through the device as a function of the detuning energy \(\widetilde{\varepsilon }\) (see arrow in Fig. 2c) and perpendicular magnetic field at a finite bias of VSD = 2 mV (a–d) and VSD = −2 mV (e–h). In a, the valley g-factors of the two QDs are chosen asymmetrically (\({g}_{{\rm{v}}}^{{\rm{e}}}=15\) for the electron QD and \({g}_{{\rm{v}}}^{{\rm{h}}}=20\) for the hole QD), resulting in a splitting of both, the α and β transition, which scales with the difference in the valley g-factors. In b, the valley g-factors of the two QDs are chosen less asymmetrically (\({g}_{{\rm{v}}}^{{\rm{e}}}=15\) for the electron QD and \({g}_{{\rm{v}}}^{{\rm{h}}}=17\) for the hole QD), resulting in a smaller splitting of both, the α and β transition, which scales with the difference in the valley g-factors. In c the valley g-factors are chosen symmetrically (gv = 15), and no dependence on B⊥ is observed. In d, the experimentally observed g-factor difference of \({g}_{{\rm{v}}}^{{\rm{e}}}=15\) and \({g}_{{\rm{v}}}^{{\rm{h}}}=15.1\) is used for the simulation. e–h, For reverse bias, the single-particle blockade remains robust and the current is zero, independent of the chosen valley g-factor asymmetry, as the spin and valley texture, that is, the level ordering remains symmetrical.
