论文标题
流体动力传输和违反结节半段绑定的粘度与入侵比
Hydrodynamic transport and violation of the viscosity-to-entropy ratio bound in nodal-line semimetals
论文作者
论文摘要
剪切粘度与熵$η/s $之间的比率被认为是量子系统相互作用强度的普遍度量。该数量被认为具有通用的下限$（1/4π）\ hbar/k_ {b} $，这表明非常相关的量子流体非常相关。通过解决流体动力学状态中节点线半学的量子动力学理论，我们表明$η/s \ propto t $ t违反了通用下限，在扰动极限中降低了温度$ t $ t的降低。我们发现，碰撞之间的流体动力散射时间几乎独立于温度，直至对数缩放校正，并且在Mott-Ragel-ioffe极限附近的大节点线上可能非常短。我们的发现表明，节点线半学可以非常相关的量子系统。
The ratio between the shear viscosity and the entropy $η/s$ is considered a universal measure of the strength of interactions in quantum systems. This quantity was conjectured to have a universal lower bound $(1/4π)\hbar/k_{B}$, which indicates a very strongly correlated quantum fluid. By solving the quantum kinetic theory for a nodal-line semimetal in the hydrodynamic regime, we show that $η/s\propto T$ violates the universal lower bound, scaling towards zero with decreasing temperature $T$ in the perturbative limit. We find that the hydrodynamic scattering time between collisions is nearly temperature independent, up to logarithmic scaling corrections, and can be extremely short for large nodal lines, near the Mott-Ragel-Ioffe limit. Our finding suggests that nodal-line semimetals can be very strongly correlated quantum systems.
