Pauli spin blockade (PSB) is a key paradigm in semiconductor nanostructures that gives access to the spin physics. We report the direct observation of PSB using gate-dispersive reflectometry on double quantum dots in the presence of a finite source-drain bias voltage. The reservoir charge transitions are strongly modulated, turning on and off when entering and leaving the blockaded region, consistent with a simple model. Observed in hole double quantum dots in a $\mathrm{Ge}$/$\mathrm{Si}$ core/shell nanowire and a $\mathrm{Si}$ fin field-effect transistor, the effects are enhanced at larger bias voltage and suppressed by a magnetic field. This work establishes the fundamental dispersive signature of PSB under bias as an emerging tool for probing quantum dot devices.

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• Quantum information with solid state qubits
• Spin blockade
• Core-shell nanoparticles
• Double quantum dots
• Nanowires
• Qubits
• Spin
• Radiofrequency reflectometry