Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions
Abstract The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs forms Andreev molecule states (AMSs), which provide a new ingredient to engineer exotic SC phenomena such as to...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-12-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-44111-3 |
| _version_ | 1797388206277132288 |
|---|---|
| author | Sadashige Matsuo Takaya Imoto Tomohiro Yokoyama Yosuke Sato Tyler Lindemann Sergei Gronin Geoffrey C. Gardner Sho Nakosai Yukio Tanaka Michael J. Manfra Seigo Tarucha |
| author_facet | Sadashige Matsuo Takaya Imoto Tomohiro Yokoyama Yosuke Sato Tyler Lindemann Sergei Gronin Geoffrey C. Gardner Sho Nakosai Yukio Tanaka Michael J. Manfra Seigo Tarucha |
| author_sort | Sadashige Matsuo |
| collection | DOAJ |
| description | Abstract The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs forms Andreev molecule states (AMSs), which provide a new ingredient to engineer exotic SC phenomena such as topological SC states and Andreev qubits. Here we provide tunneling spectroscopy measurements on a device consisting of two electrically controllable planar JJs sharing a single SC electrode. We discover that Andreev spectra in the coupled JJ are highly modulated from those in the single JJs and possess phase-dependent AMS features reproduced in our numerical calculation. Notably, the SC gap closing due to the AMS formation is experimentally observed. Our results help in understanding SC transport derived from the AMS and promoting the use of AMS physics to engineer topological SC states and quantum information devices. |
| first_indexed | 2024-03-08T22:37:25Z |
| format | Article |
| id | doaj.art-77673d837d694bb6888f7b49bd14d138 |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-08T22:37:25Z |
| publishDate | 2023-12-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-77673d837d694bb6888f7b49bd14d1382023-12-17T12:23:22ZengNature PortfolioNature Communications2041-17232023-12-011411810.1038/s41467-023-44111-3Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctionsSadashige Matsuo0Takaya Imoto1Tomohiro Yokoyama2Yosuke Sato3Tyler Lindemann4Sergei Gronin5Geoffrey C. Gardner6Sho Nakosai7Yukio Tanaka8Michael J. Manfra9Seigo Tarucha10Center for Emergent Matter Science, RIKENCenter for Emergent Matter Science, RIKENDepartment of Materials Engineering Science, Osaka UniversityCenter for Emergent Matter Science, RIKENDepartment of Physics and Astronomy, Purdue UniversityBirck Nanotechnology Center, Purdue UniversityBirck Nanotechnology Center, Purdue UniversityDepartment of Applied Physics, Nagoya UniversityDepartment of Applied Physics, Nagoya UniversityDepartment of Physics and Astronomy, Purdue UniversityCenter for Emergent Matter Science, RIKENAbstract The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs forms Andreev molecule states (AMSs), which provide a new ingredient to engineer exotic SC phenomena such as topological SC states and Andreev qubits. Here we provide tunneling spectroscopy measurements on a device consisting of two electrically controllable planar JJs sharing a single SC electrode. We discover that Andreev spectra in the coupled JJ are highly modulated from those in the single JJs and possess phase-dependent AMS features reproduced in our numerical calculation. Notably, the SC gap closing due to the AMS formation is experimentally observed. Our results help in understanding SC transport derived from the AMS and promoting the use of AMS physics to engineer topological SC states and quantum information devices.https://doi.org/10.1038/s41467-023-44111-3 |
| spellingShingle | Sadashige Matsuo Takaya Imoto Tomohiro Yokoyama Yosuke Sato Tyler Lindemann Sergei Gronin Geoffrey C. Gardner Sho Nakosai Yukio Tanaka Michael J. Manfra Seigo Tarucha Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions Nature Communications |
| title | Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions |
| title_full | Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions |
| title_fullStr | Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions |
| title_full_unstemmed | Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions |
| title_short | Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions |
| title_sort | phase dependent andreev molecules and superconducting gap closing in coherently coupled josephson junctions |
| url | https://doi.org/10.1038/s41467-023-44111-3 |
| work_keys_str_mv | AT sadashigematsuo phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT takayaimoto phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT tomohiroyokoyama phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT yosukesato phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT tylerlindemann phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT sergeigronin phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT geoffreycgardner phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT shonakosai phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT yukiotanaka phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT michaeljmanfra phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions AT seigotarucha phasedependentandreevmoleculesandsuperconductinggapclosingincoherentlycoupledjosephsonjunctions |