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KAKEN_26610106seika.pdf
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超伝導の力学的検出とトポロジカル超伝導への応用
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チョウデンドウ ノ リキガクテキ ケンシュツ ト トポロジカル チョウデンドウ エノ オウヨウ
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Chodendo no rikigakuteki kenshutsu to toporojikaru chodendo eno oyo
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Mechanical detection of superconductivity and its application to topological studies
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白濱, 圭也
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シラハマ, ケイヤ
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Shirahama, Keiya
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慶應義塾大学・理工学部・教授
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Research team head
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科研費研究者番号 : 70251486
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2016
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科学研究費補助金研究成果報告書
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2015
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本研究では, 超流動ヘリウムの実験手法であるねじれ振り子法を超伝導に応用し, 超伝導を力学的に観測する手法を確立し, トポロジカル超伝導で期待される熱流・回転交差相関効果の探索を行うことを目指した。当初の目標であった高いQ値のねじれ振り子による超伝導検出は技術的課題が大きいという結論にいたり, 超伝導転移による角運動量変化をねじれ振動子のトルク測定で検出する手法の開発を進めた。またこの手法の開発に役立つ回転クライオスタットを開発し, 円環状超流動4Heの第二音波に対する回転効果の測定を行い, 回転速度がある閾値を超えたときに, 回転停止後も量子渦がピン止めされ残留することを示唆する結果を得た。
We have applied torsional oscillator technique (TO), a gold standard in superfluid studies, to detect the mass superfluidity of superconducting electrons. We also aimed at detecting a predicted cross-correlation effect of rotation and thermal flow in topological superconductors. Our original idea utilizing high-Q TO was concluded to have difficulties to realize. We have alternatively developed another method in which angular momentum of superconducting electrons are detected by change in torque of TO. We also developed a rotating cryostat to apply rotation to supercoductors, and studied the rotation effect on superfluid second sound in annular superfluid 4He. We have found a probably new phenomenon that the quantized vortices induced by rotation are strongly pinned and remained in the annular 4He after stopping rotation.
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研究種目 : 挑戦的萌芽研究
研究期間 : 2014~2015
課題番号 : 26610106
研究分野 : 低温物理学
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