Evidence for $π$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866909380092362752 |
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| author | Gupta, Mohit Khade, Vipin Riggert, Colin Shani, Lior Menning, Gavin Lueb, Pim Jung, Jason Mélin, Régis Bakkers, Erik P. A. M. Pribiag, Vlad S. |
| author_facet | Gupta, Mohit Khade, Vipin Riggert, Colin Shani, Lior Menning, Gavin Lueb, Pim Jung, Jason Mélin, Régis Bakkers, Erik P. A. M. Pribiag, Vlad S. |
| contents | Josephson junctions are typically characterized by a single phase difference across two superconductors. This conventional two-terminal Josephson junction can be generalized to a multi-terminal device where the Josephson energy contains terms with contributions from multiple independent phase variables. Such multi-terminal Josephson junctions (MTJJs) are being considered as platforms for engineering effective Hamiltonians with non-trivial topologies, such as Weyl crossings and higher-order Chern numbers. These prospects rely on the ability to create MTJJs with non-classical multi-terminal couplings in which only a few quantum modes are populated. Here, we demonstrate these requirements in a three-terminal Josephson junction fabricated on selective-area-grown (SAG) PbTe nanowires. We observe signatures of a $π$-shifted Josephson effect, consistent with inter-terminal couplings mediated by four-particle quantum states called Cooper quartets. We further observe supercurrent co-existent with a non-monotonic evolution of the conductance with gate voltage, indicating transport mediated by a few quantum modes in both two- and three-terminal devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_17703 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Evidence for $π$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions Gupta, Mohit Khade, Vipin Riggert, Colin Shani, Lior Menning, Gavin Lueb, Pim Jung, Jason Mélin, Régis Bakkers, Erik P. A. M. Pribiag, Vlad S. Mesoscale and Nanoscale Physics Superconductivity Josephson junctions are typically characterized by a single phase difference across two superconductors. This conventional two-terminal Josephson junction can be generalized to a multi-terminal device where the Josephson energy contains terms with contributions from multiple independent phase variables. Such multi-terminal Josephson junctions (MTJJs) are being considered as platforms for engineering effective Hamiltonians with non-trivial topologies, such as Weyl crossings and higher-order Chern numbers. These prospects rely on the ability to create MTJJs with non-classical multi-terminal couplings in which only a few quantum modes are populated. Here, we demonstrate these requirements in a three-terminal Josephson junction fabricated on selective-area-grown (SAG) PbTe nanowires. We observe signatures of a $π$-shifted Josephson effect, consistent with inter-terminal couplings mediated by four-particle quantum states called Cooper quartets. We further observe supercurrent co-existent with a non-monotonic evolution of the conductance with gate voltage, indicating transport mediated by a few quantum modes in both two- and three-terminal devices. |
| title | Evidence for $π$-shifted Cooper quartets and few-mode transport in PbTe nanowire three-terminal Josephson junctions |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2312.17703 |