抄録
Offer Organization: Japan Society for the Promotion of Science, System Name: Grants-in-Aid for Scientific Research, Category: Grant-in-Aid for Scientific Research (C), Fund Type: -, Overall Grant Amount: - (direct: 3500000, indirect: 1050000)
In the system of one-dimensional (1D) 4He, a dynamical superfluid response is expected to appear. Our purpose is to clarify how the superfluid specific to 1D becomes prominent. First, we studied the channel diameter dependence of superfluid response. When the channel diameter is reduced from 2.8 to 2.5 nm, the superfluid grows gradually with decreasing temperature, differently from the rather rapid rise for 2.8 nm. In the narrower channel, thermal activation of phase slip occurs at the lower temperature, which breaks the superfluid coherence at the lower temperature than the onset of dynamical one.
We also studied the dilute limit that the dynamical superfluid response appears for 2.8 nm channel. We found that under the unsaturated vapor pressure, a dilute liquid exists in the channel and shows a dynamical superfluid response with a large frequency dependence. We succeeded in explaining the superfluid response from dilute to pressurized liquid by the TL liquid model.