Control of Andreev Reflection via a Single-Molecule Orbital
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915223371251712 |
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| author | Meyer, Lorenz Lado, Jose L. Néel, Nicolas Kröger, Jörg |
| author_facet | Meyer, Lorenz Lado, Jose L. Néel, Nicolas Kröger, Jörg |
| contents | Charge transport across a single-molecule junction fabricated from a normal-metal tip, a phthalocyanine, and a conventional superconductor in a scanning tunneling microscope is explored as a function of the gradually closed vacuum gap. The phthalocyanine (2H-Pc) molecule and its pyrrolichydrogen-abstracted derivative (Pc) exhibit vastly different behavior. Andreev reflection across the 2H-Pc contact exhibits a temporary enhancement that diminishes with increasing conductance. The hybridization of 2H-Pc with the tip at contact formation gives rise to a Kondo-screened molecular magnetic moment. In contrast, the single-Pc junction lacks Andreev reflection in the same conductance range. Spectroscopies and supporting nonequilibrium Green function calculations highlight the importance of a molecular orbital close to the Fermi energy for Andreev reflection. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_01635 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Control of Andreev Reflection via a Single-Molecule Orbital Meyer, Lorenz Lado, Jose L. Néel, Nicolas Kröger, Jörg Mesoscale and Nanoscale Physics Superconductivity Charge transport across a single-molecule junction fabricated from a normal-metal tip, a phthalocyanine, and a conventional superconductor in a scanning tunneling microscope is explored as a function of the gradually closed vacuum gap. The phthalocyanine (2H-Pc) molecule and its pyrrolichydrogen-abstracted derivative (Pc) exhibit vastly different behavior. Andreev reflection across the 2H-Pc contact exhibits a temporary enhancement that diminishes with increasing conductance. The hybridization of 2H-Pc with the tip at contact formation gives rise to a Kondo-screened molecular magnetic moment. In contrast, the single-Pc junction lacks Andreev reflection in the same conductance range. Spectroscopies and supporting nonequilibrium Green function calculations highlight the importance of a molecular orbital close to the Fermi energy for Andreev reflection. |
| title | Control of Andreev Reflection via a Single-Molecule Orbital |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2504.01635 |