記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.111.144508

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.111.144508/fulltext

掲載種別：研究論文（学術雑誌）   出版者・発行元：IOP Publishing  

Abstract

Acoustic metasurfaces, which utilize acoustically resonating structures, enable precise control and shielding of sound waves through compact, subwavelength devices. In this study, we propose a multi-resonant metasurface design comprising a decorated membrane, Helmholtz resonators, and a defective pillar array. The proposed structure facilitates both sound absorption and energy harvesting. The effectiveness of its multiple-resonance mechanism was validated through numerical and experimental analyses. Numerical calculations revealed three resonant peaks within the frequency range of 500 Hz to 4000 Hz, achieving an average absorption coefficient of over 90%. Additionally, the structure demonstrated an average generated voltage of 1.6 mV as the potential difference across the PZT patch. Furthermore, we propose the application of this structure in the development of phononic-structural metasurfaces. This metasurface comprises multiple resonant structures of varying sizes, enabling the superposition of resonance peaks from individual units. This design facilitates broadband sound absorption in the audible frequency range.

DOI： 10.35848/1347-4065/adbd4a

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その他リンク： https://iopscience.iop.org/article/10.35848/1347-4065/adbd4a/pdf

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.111.064502

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.111.064502/fulltext

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

DOI： 10.1038/s42005-024-01931-z

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その他リンク： https://www.nature.com/articles/s42005-024-01931-z

担当区分：筆頭著者   記述言語：英語  

DOI： 10.48550/arXiv.2403.04421

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

Supercurrent diodes are nonreciprocal electronic elements whose switching current depends on their flow direction. Recently, a variety of composite systems combining different materials and engineered asymmetric superconducting devices have been proposed. Yet, ease of fabrication and tunable sign of supercurrent rectification joined to large efficiency have not been assessed in a single platform so far. We demonstrate that all-metallic superconducting Dayem nanobridges naturally exhibit nonreciprocal supercurrents under an external magnetic field, with a rectification efficiency up to ~ 27%. Our niobium nanostructures are tailored so that the diode polarity can be tuned by varying the amplitude of an out-of-plane magnetic field or the temperature in a regime without magnetic screening. We show that sign reversal of the diode effect may arise from the high-harmonic content of the current phase relation in combination with vortex phase windings present in the bridge or an anomalous phase shift compatible with anisotropic spin-orbit interactions.

DOI： 10.1038/s42005-023-01458-9

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その他リンク： https://www.nature.com/articles/s42005-023-01458-9

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.108.l020502

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.108.L020502/fulltext

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

We study the Josephson effects arising in junctions made of non-centrosymmetric superconductors with spin-triplet pairing having s-wave orbital-singlet symmetry. We demonstrate that the orbital dependent character of the spin-triplet order parameter determines its non-trivial texture in the momentum space due to the inversion symmetry breaking and spin-orbit interactions. The emergence of this pattern is responsible for the occurrence of an anomalous Josephson coupling and a dominance of high-harmonics in the current phase relation. Remarkably, due to the spin-orbital couplings, variations in the electronic structure across the heterostructure can generally turn the ground state of the junction from 0- to a generic value of the Josephson phase, thus realizing the so-called φ-junction. Hallmarks of the resulting Josephson behavior, apart from non-standard current-phase relation, are provided by an unconventional temperature and magnetic field dependence of the critical current. These findings indicate the path for the design of superconducting orbitronics devices and account for several observed anomalies of the supercurrent in oxide interface superconductors.

DOI： 10.1038/s41535-022-00509-8

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その他リンク： https://www.nature.com/articles/s41535-022-00509-8

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevresearch.4.013135

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.4.013135/fulltext

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.102.144512

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.102.144512/fulltext

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.100.104524

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.100.104524/fulltext

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)  

DOI： 10.1103/physrevb.97.174522

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その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.97.174522/fulltext

担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：一般社団法人 日本物理学会  

<p>単原子層物質は、異方的超伝導の探索において近年注目を集めている物質の一つでであり、その多くは2次元ハニカム格子をもつ。中でもグラフェン等の14族原子で形成される単原子層物質の内在型スピン軌道相互作用に注目すると、シリセンではグラフェンに比べて4000倍も大きくなる。本研究では、このハニカム格子に内在型スピン軌道相互作用を取り入れた模型であるKane-Mele模型において内在型スピン軌道相互作用によって安定化しうる超伝導ペアをクーロン斥力由来の超伝導を仮定して理論的に調べる。</p>

DOI： 10.7566/jpsj.85.104704

CiNii Article

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