4He in Nanoporous Media: 4D XY Quantum Criticality at Finite Temperatures
4He in Nanoporous Media: 4D XY Quantum Criticality at Finite Temperatures
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纳米多孔介质中的 4He：有限温度下的 4D XY 量子临界点
DOI：
10.1007/s10909-022-02742-8
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发表时间：
2022
影响因子：
2
通讯作者：
Keiya Shirahama
中科院分区：
文献类型：
--
作者：
Tomoyuki Tani;Yusuke Nago;Satoshi Murakawa;Keiya Shirahama
本文综述了我们对纳米多孔玻璃中超流氦临界现象的研究，纳米多孔介质中的氦是研究玻色子量子相变的理想场所。在目前的工作中，使用新开发的流体力学机械谐振器的临界现象进行了检查。发现超流密度的临界指数为1.0，而体He的临界指数为0.67。我们还证明了超流密度与任意有限温度成正比。这些是4D XY临界性的决定性证据，它应该只在0 K，在有限的温度下观察到。我们提出了一个机制的量子临界在有限温度下的纳米局域玻色凝聚体（LBECs）在纳米孔之间的相位对齐。与量子效应相比，在考虑相关长度的情况下，对所提出的机制进行了讨论。
We review our study of critical phenomena in superfluidHe confined in nanoporous glasses.He in nanoporous media is an ideal ground to survey the quantum phase transition of bosons. In the present work, critical phenomena were examined using a newly developed hydrodynamic mechanical resonator. The critical exponent of superfluid densitywas found to be 1.0, in contrast to 0.67 in bulkHe. We also demonstrate that the superfluid density is proportional towithat any finite temperatures. These are the decisive pieces of evidence for the 4D XY criticality, which should have been observed only at 0 K, at finite temperatures. We propose a mechanism of the quantum criticality at finite temperatures in terms of phase alignment among the nanoscale localized Bose condensates (LBECs) in nanopores. The proposed mechanism is discussed in the consideration of the correlation length compared with the quantum effect.