论文标题
在单层高-TC铁超导体中发现配对密度波状态
Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor
论文作者
论文摘要
配对密度波（PDW）是一个非凡的超导状态，库珀对具有非零动量。当使零动量对库珀对的全部凝结感到沮丧时，它可能会出现。最近出现了在高温（高-TC）丘比特超导体和kagome超导体中存在内在的PDW秩序的证据。但是，尚未通过实验观察到基于铁的高-TC超导体的PDW顺序。在这里，使用扫描隧道显微镜/光谱法，我们报告了基于单层铁的高-TC FE（TE，SE）膜在SRTIO3（001）底物上生长的PDW状态。在域壁上，通过状态局部密度的空间电子调制，超导间隙的空间调制，超导差距和PDW围绕相互构图的电荷电荷波动层的错位观察到具有λ〜3.6A_FE（A_FE是邻近Fe原子之间的距离）的PDW状态。单层FE（TE，SE）膜中PDW状态的发现提供了一个低维平台，以研究相关的电子状态与高-TC超导体中相关的电子状态与非常规的Cooper配对之间的相互作用。
The pair density wave (PDW) is an extraordinary superconducting state where Cooper pairs carry nonzero momentum. It can emerge when the full condensation of zero momentum Cooper pairs is frustrated. Evidence for the existence of intrinsic PDW order in high-temperature (high-Tc) cuprate superconductors and kagome superconductors has emerged recently. However, the PDW order in iron-based high-Tc superconductors has not been observed experimentally. Here, using scanning tunneling microscopy/spectroscopy, we report the discovery of the PDW state in monolayer iron-based high-Tc Fe(Te,Se) films grown on SrTiO3(001) substrates. The PDW state with a period of λ~3.6a_Fe (a_Fe is the distance between neighboring Fe atoms) is observed at the domain walls by the spatial electronic modulations of the local density of states, superconducting gap, and the π-phase shift boundaries of the PDW around the dislocations of the intertwined charge density wave order. The discovery of the PDW state in the monolayer Fe(Te,Se) film provides a low-dimensional platform to study the interplay between the correlated electronic states and unconventional Cooper pairing in high-Tc superconductors.
