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KAKEN_17H02925seika.pdf
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Download
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:989.5 KB
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:Mar 5, 2021 |
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| Title |
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ヘリウム薄膜における量子弾性効果と超固体現象の解明
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ヘリウム ハクマク ニ オケル リョウシ ダンセイ コウカ ト チョウコタイ ゲンショウ ノ カイメイ
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Heriumu hakumaku ni okeru ryōshi dansei kōka to chōkotai genshō no kaimei
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Novel elastic effect and possible supersolidity in helium films
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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 (矢上) ・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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2020
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科学研究費補助金研究成果報告書
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2019
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2次元量子多体系であるグラファイト(Gr)表面上ヘリウム(4He)薄膜の弾性率が低温で増大する「弾性異常」を発見し、更に吸着第2層で超流動と剛性が共存することを示唆する結果を得た。弾性異常の存在から、Gr上He薄膜が他He薄膜と同様に、局在状態と空間的に拡がった励起状態を有し、吸着量の増加による超流動の発現は局在状態と拡がった状態間の「量子相転移」と解釈できることを明らかにした。これはヘリウム薄膜の諸性質が「量子相転移」描像で普遍的に理解できることを示す重要な成果である。また六方晶窒化ホウ素(hBN)表面上4He薄膜の弾性と超流動性がGr上薄膜と定性的に同様の挙動を示すことも明らかにした。
We discovered "elastic anomaly" (increase in shear modulus at low temperatures) in 4He films adsorbed on graphite (Gr), a two-dimensional quantum many-body system. We also observed a coexistence of superfluidity and rigidity in the second layer. Our results shows that He films on Gr are characterized by "quantum phase transition picture", in which a insulator - superfluid transition occurs by the gap closure of localized and spatially extended states. We have studied elasticity and superfluidity of 4He films on the hexagonal boron nitride (hBN) surface, and have found elastic anomalies and superfluid transitions both of which are qualitatively same as those of the films on Gr.
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研究種目 : 基盤研究 (B) (一般)
研究期間 : 2017～2019
課題番号 : 17H02925
研究分野 : 低温物理学
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