Pulsed-gate spectroscopy of single-electron spin states in bilayer graphene quantum dots

Graphene and bilayer graphene quantum dots are promising hosts for spin qubits with long coherence times. Although recent technological improvements make it possible to confine single electrons electrostatically in their valley texture of the single-particle spectrum has been studied detail, relaxation dynamics remains still unexplored. Here, we report on transport through a high-frequency gate-controlled single-electron dot. By transient current spectroscopy states, extract lower bound time 0.5 $\ensuremath{\mu}\mathrm{s}$. This result represents an important step towards investigation times graphene-based implementation qubits.