Serch for new vortex phase in two-dimensonal superfluid

2014 Fiscal Year Final Research Report

• 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
• Keywords: KT転移 / 量子渦 / トポロジカル欠陥 / 超流動 / ヘリウム4

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.

Free Research Field

低温物理