Full tomography of topological Andreev bands in graphene Josephson junctions
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910072715608064 |
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| author | Jung, Woochan Jin, Seyoung Park, Sein Shin, Seung-Hyun Watanabe, Kenji Taniguchi, Takashi Cho, Gil Young Lee, Gil-Ho |
| author_facet | Jung, Woochan Jin, Seyoung Park, Sein Shin, Seung-Hyun Watanabe, Kenji Taniguchi, Takashi Cho, Gil Young Lee, Gil-Ho |
| contents | Multiply connected electronic networks threaded by flux tubes have been proposed as a platform for adiabatic quantum transport and topological states. Multi-terminal Josephson junction (MTJJ) has been suggested as a pathway to realize this concept. Yet, the manifestations of topology in MTJJ remain open for experimental study. Here, we investigated the artificial topological band structure of three-terminal graphene Josephson junctions. Employing tunnelling spectroscopy and magnetic flux gates, we captured the tomography of the Andreev bound state (ABS) energy spectrum as a function of two independent phase differences. This ABS spectrum exhibits the topological transition from gapped to gapless states, akin to the band structure of nodal-line semimetals. Our results show the potential of graphene-based MTJJs for engineering band topologies in higher dimensions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01170 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Full tomography of topological Andreev bands in graphene Josephson junctions Jung, Woochan Jin, Seyoung Park, Sein Shin, Seung-Hyun Watanabe, Kenji Taniguchi, Takashi Cho, Gil Young Lee, Gil-Ho Mesoscale and Nanoscale Physics Superconductivity Multiply connected electronic networks threaded by flux tubes have been proposed as a platform for adiabatic quantum transport and topological states. Multi-terminal Josephson junction (MTJJ) has been suggested as a pathway to realize this concept. Yet, the manifestations of topology in MTJJ remain open for experimental study. Here, we investigated the artificial topological band structure of three-terminal graphene Josephson junctions. Employing tunnelling spectroscopy and magnetic flux gates, we captured the tomography of the Andreev bound state (ABS) energy spectrum as a function of two independent phase differences. This ABS spectrum exhibits the topological transition from gapped to gapless states, akin to the band structure of nodal-line semimetals. Our results show the potential of graphene-based MTJJs for engineering band topologies in higher dimensions. |
| title | Full tomography of topological Andreev bands in graphene Josephson junctions |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2411.01170 |