Co-tunneling spin blockade observed in a three-terminal triple quantum dot

Abstract

We prepare a triple quantum dot with a separate contact lead to each dot to study Pauli spin blockade in the tunnel-coupled three dots in a row. We measure the tunneling current flowing between the center dot and either the left or right dot with the left and right leads as a common source and the center lead as a drain. In the biased stability diagram, we establish Pauli spin blockade in the respective neighboring dots, with features similarly obtained in double quantum dot systems. We further realize Pauli spin blockade with two different conditions by tuning the inter-dot coupling gates: strong and weak inter-dot tunnel coupling regimes. In the strong-coupling regime we observe significant suppression of co-tunneling through the respective double dots due to Pauli spin blockade. We reveal the influence from the third dot in the triple dot device on this co-tunneling Pauli spin blockade and clarify that the co-tunneling Pauli spin blockade is lifted by the resonant coupling of excited states to the third dot level as well as spin exchange of the left and right dots with the adjacent reservoir.

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Cited by in corpus (5)

• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Dark states in spin-polarized transport through triple quantum dot molecules
• Tunable tunnel coupling in a double quantum antidot with cotunneling via localized state
• Pauli Spin Blockade in a Resonant Triple Quantum Dot Molecule
• Coherent time-dependent oscillations and temporal correlations in triangular triple quantum dots