论文标题
具有内在的Josephson连接的高临界温度超导体的时空结晶顺序
Space-time crystalline order of a high-critical-temperature superconductor with intrinsic Josephson junctions
论文作者
论文摘要
从理论上讲，我们表明，高临界超导体BI $ _2 $ _2 $ _2 $ cacu $ _2 $ _2 $ o $ _ {8+x} $（BSCCO）是最近设想的最近设想的经典时空水晶的自然候选人。 BSCCO本质上形成了一堆约瑟夫森连接。在约瑟夫森临界电流密度的周期性参数调制下，约瑟夫森电流会形成耦合时空晶体顺序，从而打破了时空和时间上的连续翻译对称性。调制频率和振幅范围跨度为A（非平衡）相图，用于所谓的时空阶参数，该参数在相图的特定区域内显示刚性模式的形成。基于我们使用代表性材料特性的计算，我们提出了一个激光调节实验，以实现预测的时空晶体行为。我们的发现将新的见解带入了时空晶体的性质，更一般而言，进入了非平衡驱动的冷凝物质系统。
We theoretically demonstrate that the high-critical-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ (BSCCO) is a natural candidate for the recently envisioned classical space-time crystal. BSCCO intrinsically forms a stack of Josephson junctions. Under a periodic parametric modulation of the Josephson critical current density, the Josephson currents develop coupled space-time crystalline order, breaking the continuous translational symmetry in both space and time. The modulation frequency and amplitude span a (nonequilibrium) phase diagram for a so-defined spatiotemporal order parameter, which displays rigid pattern formation within a particular region of the phase diagram. Based on our calculations using representative material properties, we propose a laser-modulation experiment to realize the predicted space-time crystalline behavior. Our findings bring new insight into the nature of space-time crystals and, more generally, into nonequilibrium driven condensed matter systems.
