Local control of parity and charge in nanoscale superconducting lead islands
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918094780235776 |
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| author | Trivini, Stefano Ortuzar, Jon Vaxevani, Katerina Viña-Bausá, Beatriz Bergeret, F. Sebastian Pascual, Jose Ignacio |
| author_facet | Trivini, Stefano Ortuzar, Jon Vaxevani, Katerina Viña-Bausá, Beatriz Bergeret, F. Sebastian Pascual, Jose Ignacio |
| contents | Small superconducting islands can exhibit charge quantization, where Coulomb interactions compete with Cooper pairing. Using scanning tunneling spectroscopy, we probe this interplay by measuring the charging energy ($E_C$) and the pairing energy ($Δ$) of individual nano-islands. Below a critical island size, where $E_C > Δ$, we observe a crossover between even and odd parity ground states. By applying controlled voltage pulses, we continuously tune the island's electrostatic potential and map the full charge-parity landscape. These results demonstrate tunable superconducting ground states, offering a potential platform for qubit design and control. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_12150 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Local control of parity and charge in nanoscale superconducting lead islands Trivini, Stefano Ortuzar, Jon Vaxevani, Katerina Viña-Bausá, Beatriz Bergeret, F. Sebastian Pascual, Jose Ignacio Mesoscale and Nanoscale Physics Small superconducting islands can exhibit charge quantization, where Coulomb interactions compete with Cooper pairing. Using scanning tunneling spectroscopy, we probe this interplay by measuring the charging energy ($E_C$) and the pairing energy ($Δ$) of individual nano-islands. Below a critical island size, where $E_C > Δ$, we observe a crossover between even and odd parity ground states. By applying controlled voltage pulses, we continuously tune the island's electrostatic potential and map the full charge-parity landscape. These results demonstrate tunable superconducting ground states, offering a potential platform for qubit design and control. |
| title | Local control of parity and charge in nanoscale superconducting lead islands |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.12150 |