Observation of superfluidity in two- and one-dimensions

• Published in: Физика низких температур
• Date: 2013
• Main Authors: Wada, Nobuo, Hieda, Mitsunori, Toda, Ryo, Matsushita, Taku
• Format: Article
• Language: English
• Published: 2013
• Subjects: Сверхтекучесть в низкоразмерных системах и в условиях ограниченной геометрии
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118750
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Observation of superfluidity in two- and one-dimensions / Nobuo Wada, Mitsunori Hieda, Ryo Toda, Taku Matsushita // Физика низких температур. — 2013. — Т. 39, № 9. — С. 1012–1020. — Бібліогр.: 38 назв. — англ.

Even though there is no long-range-ordered state of a superfluid in dimensions lower than the three-dimension (3D) such as bulk ⁴He liquid, superfluidity has been observed for flat ⁴He films in 2D and recently for nanotubes of ⁴He in 1D by the torsional oscillator method. In the 2D state, in addition to the superfluid below the 2D Kosterlitz–Thouless transition temperature TKT, superfluidity is also observed in a normal fluid state above TKT, which depends strongly on the measurement frequency and the system size. In the 1D state of the nano-tubes, superfluidity is directly observed as a frequency shift in the torsional oscillator experiment. Some calcula-tions suggest a superfluidity of a 1D Bose fluid with a finite length, where thermal excitations of 2-phase winding play the main role for superfluid onset of each tube. Dynamics of the 1D superfluidity is also suggested by observing the dissipation in the torsional oscillator experiment.