2021 Fiscal Year Final Research Report
Microwave Spectroscopy of Hybrid Topological Systems
| 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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| Keywords | Andreev Bound state / Josephson junction / Nanowire / Resonator / Topological / Majorana |
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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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| Free Research Field |
Condensed Matter Physics
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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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