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Pauli blockade mechanisms -- whereby carrier transport through quantum dotsis blocked due to selection rules even when energetically allowed -- are adirect manifestation of the Pauli exclusion principle, as well as a keymechanism for manipulating and reading out spin qubits. Pauli spin blockade iswell established for systems such as GaAs QDs, but is to be further exploredfor systems with additional degrees of freedom, such as the valley quantumnumbers in carbon-based materials or silicon. Here we report experiments oncoupled bilayer graphene double quantum dots, in which the spin and valleystates are precisely controlled, enabling the observation of the two-electroncombined blockade physics. We demonstrate that the doubly occupied single dotswitches between two different ground states with gate and magnetic-fieldtuning, allowing for the switching of selection rules: with aspin-triplet--valley-singlet ground state, valley-blockade is observed; andwith the spin-singlet--valley-triplet ground state, robust spin blockade isshown.

Pauli Blockade of Tunable Two-Electron Spin and Valley States in Graphene Quantum Dots