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We measured the spectrum of a single-carrier bilayer graphene quantum dot asa function of both parallel and perpendicular magnetic fields, using atime-resolved charge detection technique that gives access to individual tunnelevents. Thanks to our unprecedented energy resolution of 4$\mu~$eV, we coulddistinguish all four levels of the dot's first orbital, in particular in therange of magnetic fields where the first and second excited states cross($B_\perp\lesssim 100~$mT). We thereby experimentally establish, the hithertoextrapolated, single-charge carrier spectrum picture and provide a new upperbound for the inter-valley mixing, equal to our energy resolution.

Spectroscopy of a single-carrier bilayer graphene quantum dot from time-resolved charge detection