Weiss, Marco and Stilp, Fabian and Reinhart, Max and Giessibl, Franz J. (2025) Measurement and qualitative explanation of decay lengths of attractive and repulsive forces between natural and artificial atoms. PHYSICAL REVIEW B, 112 (20): 205413. ISSN 2469-9950, 2469-9969
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Artificial atoms, such as quantum corrals, offer an excellent platform to study fundamental interactions between localized quantum states and nanoscale probes. We performed atomic force microscopy measurements inside square quantum corrals on Cu(111) using CO- and metal-terminated tips. Using chemically unreactive CO-terminated tips, repulsive Pauli forces can be probed, while metallic tips are attracted to the localized quantum states due to chemical bonding. We found distinct exponential decay constants of (46 +/- 6) pm for the repulsive and (66 +/- 5) pm for the attractive forces. Attractive and repulsive interactions between two natural atoms show significantly shorter decay lengths. While natural atoms feature states with a broad range of decay lengths, including very short ones from deeply bound states, quantum corrals are lacking such deeply bound and highly localized states, resulting in longer decay lengths. These results offer an alternate route to understanding and designing atomic-scale interactions in low-dimensional quantum structures and devices.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALKALI IONS LI+; QUANTUM CORRALS; DIRAC FERMIONS; SINGLE ATOMS; SURFACE; POTENTIALS; MICROSCOPY; STATES; SCATTERING; MOLECULES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Franz J. Giessibl |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jun 2026 08:20 |
| Last Modified: | 16 Jun 2026 08:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66039 |
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