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KAKEN_19K21856seika.pdf
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Title |
Title |
フォノン照射による原子分子薄膜の超流動化
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Kana |
フォノン ショウシャ ニ ヨル ゲンシ ブンシ ハクマク ノ チョウリュウドウカ
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Fonon shōsha ni yoru genshi bunshi hakumaku no chōryūdōka
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Realization of superfluidity in adsorbed molecular films by phonon irradiation
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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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石黒, 亮輔
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イシグロ, リョウスケ
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Ishiguro, Ryōsuke
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日本女子大学・理学部・准教授
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Research team member
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科研費研究者番号 : 40433312
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永合, 祐輔
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ナゴウ, ユウスケ
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Nagō, Yūsuke
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慶應義塾大学・理工学部 (矢上) ・助教
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Research team member
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科研費研究者番号 : 50623435
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2021
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科学研究費補助金研究成果報告書
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2020
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本研究は、様々な原子分子の吸着薄膜にフォノンを照射して非平衡超流動状態を実現し、物理学の発展に資することを目的とする。薄膜が吸着した固体基板に100GHz程度の超高周波フォノンを生成し、薄膜を局在状態から空間的に広がった励起状態に遷移させる。フォノン生成には超伝導トンネル接合を用いる。本研究ではNb-AlOx-Nb超伝導トンネル接合素子を作成しその電流電圧特性を調べて素子の改善を進めるとともに、2つの接合を貼り合わせることでフォノンの生成と検出を試みた。フォノン生成を示唆する信号が得られているが測定上の問題から完全な同定には至っていない。今後装置の改良を進め、非平衡超流動状態の実現を目指す。
We aim to realize non-equilibrium superfluid states by irradiating phonons on adsorbed thin films of various atoms and molecules. Such novel superfluid states will contribute to the development of physics. Ultrahigh-frequency phonons of about 100 GHz are generated on the solid substrate on which a monoatomic layer of molecules is adsorbed, so that the molecules undergo transitions from a localized state to a spatially extended excited state. A superconducting tunnel junction is used for phonon generation. We fabricated a Nb-AlOx-Nb superconducting tunnel junction device, investigated its current-voltage characteristics to improve the device, and tried to generate and detect phonons by bonding the two junctions. We have obtained signals that suggest phonon generation, but have not yet been able to identify them completely due to measurement problems. In the future, we will improve the apparatus and try to realize a non-equilibrium superfluid state in molecular films such as hydrogen.
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研究種目 : 挑戦的研究 (萌芽)
研究期間 : 2019~2020
課題番号 : 19K21856
研究分野 : 低温物理学
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May 17, 2022 | | インデックス を変更 |
Nov 14, 2022 | | Creator 著者ID,Creator Name,Creator Kana,Creator Romanization,Creator Affiliation,Creator Affiliation (Translated),Creator Role,Creator Link,Abstract 内容,Note 注記 を変更 |
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