Redox-Induced Gating of the Exchange Interactions in a Single Organic Diradical

Abstract

Embedding a magnetic electroactive molecule in a three-terminal junction allows for the fast and local electric field control of magnetic properties desirable in spintronic devices and quantum gates. Here, we provide an example of this control through the reversible and stable charging of a single all-organic neutral diradical molecule. By means of inelastic electron tunnel spectroscopy (IETS) we show that the added electron occupies a molecular orbital distinct from those containing the two radical electrons, forming a spin system with three antiferromagnetically-coupled spins. Changing the redox state of the molecule therefore switches on and off a parallel exchange path between the two radical spins through the added electron. This electrically-controlled gating of the intramolecular magnetic interactions constitutes an essential ingredient of a single-molecule $\sqrt{\text{SWAP}}$ quantum gate.

References in corpus (12)

• Supramolecular Spin Valves
• Spin qubits with electrically gated polyoxometalate molecules
• Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
• Spin-Electric Coupling in Molecular Magnets
• Electrical manipulation of spin states in a single electrostatically gated transition-metal complex
• Molecular prototypes for spin-based CNOT quantum gates
• Spin electric effects in molecular antiferromagnets
• Exchange coupling inversion in a high-spin organic triradical molecule
• Universal transport signatures in two-electron molecular quantum dots: gate-tunable Hund's rule, underscreened Kondo effect and quantum phase transitions
• Electric control of a $\{F{e}_4\}$ single-molecule magnet in a single-electron transistor
• Probing Transverse Magnetic Anisotropy by Electronic Transport through a Single-Molecule Magnet
• Observing magnetic anisotropy in electronic transport through individual single-molecule magnets

Cited by in corpus (6)

• Robust organic radical molecular junctions using acetylene terminated groups for C-Au bond formation
• Controlling the entropy of a single-molecule junction
• Magnetic Field Universality of the Kondo Effect Revealed by Thermocurrent Spectroscopy
• Phenalenyls as tunable excellent molecular conductors and switchable spin filters
• Magnetically-Tuned Kondo Effect in a Molecular Double Quantum Dot: Role of the Anisotropic Exchange
• Overcoming the challenges in controlled thermal deposition of organic diradicals