纳米多孔介质中^4He中纳米尺度玻色-爱因斯坦凝聚的热力学证据
Thermodynamic Evidence for Nanoscale Bose-Einstein Condensation in ^4He Confined in Nanoporous Media
摘要：
我们报告了在压力高达5.3 MPa的条件下，对限制在纳米多孔Gelsil玻璃（具有直径为2.5 nm的纳米孔）中的^4He的热容进行了测量。热容在远高于使用扭转振荡器技术获得的超流转变温度的温度下具有宽峰。该峰为纳米尺度上局域化玻色-爱因斯坦凝聚体（LBECs）的形成提供了明确的热力学证据。热容量的温度依赖性很好地描述了声子和声子的激发，支持LBEC的存在。
英文摘要：
We report the measurements of the heat capacity of ^4He confined in nanoporous Gelsil glass that has nanopores of 2.5-nm diameter at pressures up to 5.3 MPa. The heat capacity has a broad peak at a temperature much higher than the superfluid transition temperature obtained using the torsional oscillator technique. The peak provides a definite thermodynamic evidence for the formation of localized Bose-Einstein condensates (LBECs) on nanometer length scales. The temperature dependence of heat capacity is well described by the excitations of phonons and rotons, supporting the existence of LBEC.
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