| Project/Area Number |
19H02548
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
Deacon Russell 国立研究開発法人理化学研究所, 開拓研究本部, 専任研究員 (40552443)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2019: ¥12,480,000 (Direct Cost: ¥9,600,000、Indirect Cost: ¥2,880,000)
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| Keywords | Andreev Bound state / Josephson junction / Nanowire / Resonator / Topological / Majorana / Andreev Bound States / Josephson Junction / Andreev Bound State / Rssonator |
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| Outline of Research at the Start |
We study Andreev bound states in weak links of potential topological systems coupled to microwave cavities. Our goals are to perform spectroscopic measurements of the phase dispersion of states, study spin-orbit and Zeeman effects, and demonstrate/study topological superconducting states.
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| Outline of Final Research Achievements |
We fabricate and study Josephson junctions in both InAs and bismuth nanowires with deposition of superconducting contacts performed in-situ within the growth system. In both systems Josephson junctions are formed through the shadowing of overlapping nanowires avoiding the need for etching in device processing and protecting the nanowire surface from unnecessary damage. We couple single InAs nanowire Josephson junctions to superconducting coplanar microwave cavities and perform the dispersive readout of single Andreev bound states. Andreev bound state spectroscopy reveals not just the dispersion of single states in phase but also the presence of spin-split Andreev states through the interplay of spin-orbit interaction and confinement.
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| Academic Significance and Societal Importance of the Research Achievements |
The cavity coupled spectroscopy method developed in this study can be flexible applied to any Josephson system and can thus be of great value to the study of other Andreev bound states, not just in exotic systems but also fundamental properties of superconducting circuits for quantum computing.
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