论文标题
约瑟夫森效应是范德华异质结构双层中电子孔超流体的签名
Josephson effect as signature of electron-hole superfluidity in bilayers of van der Waals heterostructures
论文作者
论文摘要
我们研究了双层TMD异质结构中电子孔超流体中的约瑟夫森连接。观察临界隧道电流是超流体的明确特征。此外，我们发现狭窄的屏障区域中的BCS-BEC跨界物理控制整个系统中的临界电流。在该系统中可测量的相应临界速度时，当激发从骨骼到费尔米金传递时，具有最大值。值得注意的是，这发生在BEC边界的密度到从冷凝水部分确定的BCS-BEC交叉状态。这是在半导体系统中首次提供确定该边界位置的实验方法。
We investigate a Josephson junction in an electron-hole superfluid in a double layer TMD heterostructure. Observation of a critical tunneling current is a clear signature of superfluidity. In addition, we find the BCS-BEC crossover physics in the narrow barrier region controls the critical current across the entire system. The corresponding critical velocity, which is measurable in this system, has a maximum when the excitations pass from bosonic to fermionic. Remarkably, this occurs for the density at the boundary of the BEC to BCS-BEC crossover regime determined from the condensate fraction. This provides, for the first time in a semiconductor system, an experimental way to determine the position of this boundary.
