论文标题
热带声音
Hot band sound
论文作者
论文摘要
高温下的混沌晶格模型通常预期显示所有局部保守电荷的扩散运输。这种扩散的运输通常与相关电流的过度阻尼相关。在这里，我们表明，通过适当调整颗粒间相互作用，可以使无限温度下混沌费米子的晶格模型从扩散过度阻尼的状态转变为“热带声音”的阻尼不足的状态。我们研究了具有远距离密度相互作用的一维无旋转费米链的家族，即即使固定有效的相互作用强度，也可以任意长时间使声波的阻尼时间变长。我们的结果表明，在单个频段内，电荷密度不足的声波不足，远非集成性和在非常高的温度下。
Chaotic lattice models at high temperature are generically expected to exhibit diffusive transport of all local conserved charges. Such diffusive transport is usually associated with overdamped relaxation of the associated currents. Here we show that by appropriately tuning the inter-particle interactions, lattice models of chaotic fermions at infinite temperature can be made to cross over from an overdamped regime of diffusion to an underdamped regime of "hot band sound". We study a family of one-dimensional spinless fermion chains with long-range density-density interactions, in which the damping time of sound waves can be made arbitrarily long even as an effective interaction strength is held fixed. Our results demonstrate that underdamped sound waves of charge density can arise within a single band, far from integrability, and at very high temperature.
