We report on ground- and excited state transport through an electrostatically
defined few-hole quantum dot in bilayer graphene in both parallel and
perpendicular applied magnetic fields. A remarkably clear level scheme for the
two-particle spectra is found by analyzing finite bias spectroscopy data within
a two-particle model including spin and valley degrees of freedom. We identify
the two-hole ground-state to be a spin-triplet and valley-singlet state. This
spin alignment can be seen as Hund's rule for a valley-degenerate system, which
is fundamentally different to quantum dots in carbon nano tubes and GaAs-based
quantum dots. The spin-singlet excited states are found to be valley-triplet
states by tilting the magnetic field with respect to the sample plane. We
quantify the exchange energy to be 0.35meV and measure a valley and spin
g-factor of 36 and 2, respectively
