The feedback driven atomic scale Josephson microscope
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913961169911808 |
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| author | Escribano, Samuel D. Barrena, Víctor Perconte, David Moreno, Jose Antonio Lomana, Marta Fernández Águeda, Miguel Herrera, Edwin Wu, Beilun Rodrigo, Jose Gabriel Prada, Elsa Guillamón, Isabel Yeyati, Alfredo Levy Suderow, Hermann |
| author_facet | Escribano, Samuel D. Barrena, Víctor Perconte, David Moreno, Jose Antonio Lomana, Marta Fernández Águeda, Miguel Herrera, Edwin Wu, Beilun Rodrigo, Jose Gabriel Prada, Elsa Guillamón, Isabel Yeyati, Alfredo Levy Suderow, Hermann |
| contents | The ultimate spatial limit to establish a Josephson coupling between two superconducting electrodes is an atomic-scale junction. The Josephson effect in such ultrasmall junctions has been used to unveil new switching dynamics, study coupling close to superconducting bound states or reveal non-reciprocal effects. However, the Josephson coupling is weak and the sensitivity to temperature reduces the Cooper pair current magnitude. Here we show that a feedback element induces a time-dependent bistable regime which consists of spontaneous periodic oscillations between two different Cooper pair tunneling states (corresponding to the DC and AC Josephson regimes respectively). The amplitude of the time-averaged current within the bistable regime is almost independent of temperature. By tracing the periodic oscillations in the new bistable regime as a function of the position in a Scanning Tunneling Microscope, we obtain atomic scale maps of the critical current in 2H-NbSe$_2$ and find spatial modulations due to a pair density wave. Our results fundamentally improve our understanding of atomic size Josephson junctions including a feedback element in the circuit and provide a promising new route to study superconducting materials through atomic scale maps of the Josephson coupling. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_12783 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The feedback driven atomic scale Josephson microscope Escribano, Samuel D. Barrena, Víctor Perconte, David Moreno, Jose Antonio Lomana, Marta Fernández Águeda, Miguel Herrera, Edwin Wu, Beilun Rodrigo, Jose Gabriel Prada, Elsa Guillamón, Isabel Yeyati, Alfredo Levy Suderow, Hermann Superconductivity The ultimate spatial limit to establish a Josephson coupling between two superconducting electrodes is an atomic-scale junction. The Josephson effect in such ultrasmall junctions has been used to unveil new switching dynamics, study coupling close to superconducting bound states or reveal non-reciprocal effects. However, the Josephson coupling is weak and the sensitivity to temperature reduces the Cooper pair current magnitude. Here we show that a feedback element induces a time-dependent bistable regime which consists of spontaneous periodic oscillations between two different Cooper pair tunneling states (corresponding to the DC and AC Josephson regimes respectively). The amplitude of the time-averaged current within the bistable regime is almost independent of temperature. By tracing the periodic oscillations in the new bistable regime as a function of the position in a Scanning Tunneling Microscope, we obtain atomic scale maps of the critical current in 2H-NbSe$_2$ and find spatial modulations due to a pair density wave. Our results fundamentally improve our understanding of atomic size Josephson junctions including a feedback element in the circuit and provide a promising new route to study superconducting materials through atomic scale maps of the Josephson coupling. |
| title | The feedback driven atomic scale Josephson microscope |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2311.12783 |