He-4在镀氩的MCM-41纳米孔内的降维
Dimensional Reduction of Helium-4 Inside Argon Plated MCM-41 Nanopores
摘要：
描述氦-4在低温下的超流体波函数的埃尺度相干长度阻止了它在真正的一维几何中的制备。介孔有序的二氧化硅基结构，如分子筛MCM-41，提供了一个有前途的途径物理限制，但可以化学合成的最小孔径已被证明是太大，达到准一维的限制。我们提出了一个积极的纳米工程的方法来解决这个问题，通过预镀MCM-41与单一的，良好控制的层的Ar气体，然后用氦气填充孔隙。通过实验吸附等温线和中子散射测量，与大规模量子蒙特卡罗模拟一致的孔隙内的结构进行了研究。结果表明，埃和开尔文尺度的可调性的有效限制的潜力所经历的MCM-41内的4 He原子，与Ar层减少的直径的限制介质到一个政权，其中一些固体层包围的一维量子液体。
英文摘要：
The angstrom-scale coherence length describing the superfluid wavefunction of helium-4 at low temperatures has prevented its preparation in a truly one-dimensional geometry. Mesoporous ordered silica-based structures, such as the molecular sieve MCM-41, offer a promising avenue towards physical confinement, but the minimal pore diameters that can be chemically synthesized have proven to be too large to reach the quasi-one-dimensional limit. We present an active nano-engineering approach to this problem by pre-plating MCM-41 with a single, well controlled layer of Ar gas before filling the pores with helium. The structure inside the pore is investigated via experimental adsorption isotherms and neutron scattering measurements that are in agreement with large scale quantum Monte Carlo simulations. The results demonstrate angstrom and kelvin scale tunability of the effective confinement potential experienced by 4He atoms inside the MCM-41, with the Ar layer reducing the diameter of the confining media into a regime where a number of solid layers surround a one-dimensional quantum liquid.
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