Viscosity of a multichannel one-dimensional Fermi gas
Viscosity of a multichannel one-dimensional Fermi gas
复制标题
多通道一维费米气体的粘度
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
K. Matveev
中科院分区：
文献类型：
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作者：
Wade DeGottardi;K. Matveev
许多实验感兴趣的一维系统拥有由浅约束势产生的多个能带。在这项工作中，我们研究了一种弱相互作用费米子气体，并表明体积粘度因占据多个能带而显着改变。其原因有两个：多通道系统更容易偏离平衡，并且相关的弛豫过程比单通道情况导致更快的平衡。我们根据潜在的微观相互作用来估计体积粘度。在量子线和捕获的冷原子气体的背景下讨论了该物理的实验相关性。
Many one-dimensional systems of experimental interest possess multiple bands arising from shallow confining potentials. In this work, we study a gas of weakly interacting fermions and show that the bulk viscosity is dramatically altered by the occupation of more than one band. The reasons for this are two-fold: a multichannel system is more easily displaced from equilibrium and the associated relaxation processes lead to more rapid equilibration than in the single channel case. We estimate the bulk viscosity in terms of the underlying microscopic interactions. The experimental relevance of this physics is discussed in the context of quantum wires and trapped cold atomic gases.