Serch for new vortex phase in two-dimensonal superfluid

• Project/Area Number: 25610104
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Mathematical physics/Fundamental condensed matter physics
• Research Institution: Nagoya University
• Principal Investigator: HIEDA Mitsunori 名古屋大学, 理学(系)研究科(研究院), 講師 (30372527)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: KT転移 / 量子渦 / トポロジカル欠陥 / 超流動 / ヘリウム4 / 3He-4He混合薄膜

Outline of Final Research Achievements

We studied superfluidity of 3He-4He mixture films on gold substrate by quartz crystal microbalance (QCM). At present there were no clear evidence of new vortex phase in this experimental region. However the submonolayer superfluidity was strongly affected by the coverage of the 3He overlayer. Yet the mechanism is not been fully understood. From a qualitative comparison with a calculation of KT theory, we suggest the reduction of the superfluid vortex core energy by 3He as a possible scenario. With increasing temperature this scenario predicts a rapid increase of number density of vortex and therefore the emergence of a new quantum vortex phase is expected.

Research Products

• [Journal Article] Temperature-dependent pinning or depinning of a 3He overlayer in a 3He-4He mixture film (2013)
  • Author(s): T. Oda and M. Hieda
  • Journal Title: Phys. Rev. Lett. Volume: 111 Issue: 10
  • DOI: 10.1103/physrevlett.111.106101
  • Peer Reviewed
• [Journal Article] 3He effect on 2D superfluidity in 3He-4He mixture films on planar gold (2013)
  • Author(s): H. Yamaguchi, T. Oda, M. Hieda, T. Matsushita, and N. Wada
  • Journal Title: Journal of Low Temperature Physics Volume: 171 Issue: 5-6 Pages: 650-656
  • DOI: 10.1007/s10909-012-0792-3
  • Peer Reviewed
• [Journal Article] Atomic motion in low-coverage helium films adsorbed in FSM nanochannels (2013)
  • Author(s): T. Matsushita, A. Kuze, R. Kawai, M. Hieda, and N. Wada
  • Journal Title: Journal of Low Temperature Physics Volume: 171 Issue: 5-6 Pages: 657-663
  • DOI: 10.1007/s10909-012-0815-0
  • Peer Reviewed
• [Presentation] Pinning or depinning of a 3He overlayer in a 3He-4He mixture film (2014)
  • Author(s): M. Hieda and T. Oda
  • Organizer: 27th International Conference on Low Temperature Physics
  • Place of Presentation: The Palais Rouge, Buenos Aires, Argentina
  • Year and Date: 2014-08-06 – 2014-08-13
• [Presentation] 3He-4He混合薄膜中3Heオーバーレイヤーのピニング-ディピニング (2014)
  • Author(s): 小田拓也、檜枝光憲
  • Organizer: 物性研短期研究会「スーパーマターが拓く新量子現象」
  • Place of Presentation: 東京大学 物性研究所
  • Year and Date: 2014-04-17 – 2014-04-19
• [Presentation] 3He-4He混合薄膜中3Heオーバーレイヤーのピニング-ディピニング (2014)
  • Author(s): 小田拓也，檜枝光憲
  • Organizer: 日本物理学会第69回年次大会
  • Place of Presentation: 東海大学湘南キャンパス
• [Presentation] 金基板上4He薄膜KT超流動の面密度分布繰り込み計算による研究 (2013)
  • Author(s): 田中春奈，山口寛，檜枝光憲，松下琢，和田信雄
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学常三島キャンパス
• [Presentation] Submonolayer Superfluidity of 4He Films on Planar Gold (2013)
  • Author(s): M. Hieda, H. Yamaguchi, H. Tanaka, T. Matsushita, and N. Wada
  • Organizer: QFS2013
  • Place of Presentation: KUNIBIKI MESSE, Matsue, Japan
• [Presentation] Competition between superfluid overlayer and mobile solid layer of 3He-4He mixture films on porous gold (2013)
  • Author(s): J. Taniguchi, T. Mouri, M. Suzuki, M. Hieda, and T. Minoguchi
  • Organizer: QFS2013
  • Place of Presentation: KUNIBIKI MESSE, Matsue, Japan