Dynamic quantum melting and novel insulating phase in superconducting vortex solid

在零钉扎极限下，我们观察到超导体中快驱动涡旋晶格的本征熔化(即动态熔化)。随着温度的降低，动态熔化场Bc，dyn(T)的温度依赖性变得非常弱，与静态熔化场相比，Bc，dyn(T)明显受到抑制。这是第一次观测到动态量子熔化转变。虽然还没有发现新的绝缘相，但与此问题相关的是，当速度超过一定的临界值时，流动的涡旋晶格的晶格取向发生了旋转。从这一结果中，首次证明了准粒子寿命的微观机制支配着涡旋动力学的宏观行为。

We observe intrinsic melting of fast driven vortex lattice(i. e., dynamic melting) in a superconductor in the limit of zero pinning. With decreasing temperature T, the T dependence of a dynamic melting field B c, dyn(T) becomes very weak and B c, dyn(T) is significantly suppressed compared to a static melting field. This is the first observation of a dynamic quantum melting transition. Although novel insulating phases have not yet been found, related to this issue, it has been revealed that the lattice orientation of the flowing vortex lattice rotates as the velocity exceeds a certain critical value. From this result, it has been first demonstrated that a microscopic mechanism of a quasi-particle life time dominates a macroscopic behavior of vortex dynamics.