Electrical spin pumping in exchange-coupled molecules.

Remote, all-electrical spin pumping of the electron spin in single S = 1/2 molecule pairs is demonstrated, enabling control of a neighboring molecule’s spin state via exchange coupling and spin-polarized tunneling current.

• Why it matters: Single-molecule qubits need efficient, single-entity state initialization and reliable control, but remote electrical control of an individual spin state remains challenging.
• What they did: Using electron spin resonance scanning tunneling microscopy, the authors study coupled pairs of S = 1/2 molecules where one molecule both reads out and pumps the neighboring one, varying tunneling current direction/magnitude and the exchange coupling strength.
• The result: Exchange interaction is shown to enable angular momentum transfer, allowing remote control of the neighboring spin state and providing a general all-electrical route for spin pumping in related quantum architectures.

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