Study for quantum condensed phases of one-and 2-dimensional helium 3 fluids

本文研究了氦_4在直径约为18 A的一维孔中的吸附。5 K，压力精度在0. 1帕。从压力数据，我们得到的覆盖度依赖的吸附能和压缩性。结果表明，在孔壁上逐层形成直到第二层。通过<nd>~ 3 He和~ 4 He热容的同位素效应和扭振子超流观测，确定第2层为玻色流体。2^层的~ 4 He热容量<nd>具有温度线性项，其被理解为2^玻色流体层的一维声子热容量<nd>。在此基础上，我们实现了18 A孔中的一维玻色流体，并对18 A孔中的一维~ 3 He费米流体进行了展望。从热容量到80 mK，我们发现第二<nd>层薄膜是费米流体。为了了解3 He流体的一维性质，我们利用核退磁低温恒温器对3 He流体的热容进行了测量，测量结果表明，随着覆盖率的增加，3 He在Hectorite上存在弱局域化的二维费米液体和Mott-Hubbard跃迁。对于吸附在锂蒙脱石上的氦3和氦4，我们在10 MHz的超声测量中发现了原子滑移。

Helium 4 adsorbed on one-dimensional pores of the diameter about 18A has been studied by measuring pressure of adsorption at temperatures down to 0. 5K and the pressures within the accuracy of 0. 1Pa. From the pressure data, we obtained the coverage dependences of the adsorption energy and compressibility. The results indicate the layer-by-layer formation on the pore walls up to the second layer. The 2^<nd> layer was found to be the Bose fluids by the isotope effect of the 3He- and 4He-heat capacities and the superfluid observation by torsional oscillator. The 4He heat capacity of the 2^<nd> layer has a temperature -linear term, which was understood to be the 1D phonon heat capacity of the 2^<nd> Bose fluid layer. Then we realized the 1D Bose fluid in the 18A pores.We can expect the 1D 3He Fermi fluids in the pores. From the heat capacity down to 80mK, we found that the 2^<nd> layer films are Fermi fluids. To see the 1D properties of the 3He fluids, we are preparing hear capacity measurement down to about 1mK by using the nuclear demagnetizing cryostat.For 3He on Hectorite, the heat capacity results suggest the weak-localization-2D Fermi liquid and Mott-Hubbard transitions with increasing the coverage In the 2D Fermi liquids, we observed large density and spin-fluctuations characteristic to the two-dimension. For Helium 3 and 4 adsorbed on Hectorite, we obserbed atomic slippage in the ultra sound measurement at 10MHz.