通过剥离调控FeSe中相互交织的电子序
Controlling Intertwined Electronic Orders in FeSe with Exfoliation
AI总结：
本研究通过剥离FeSe实现维度缩减，抑制其电子向列响应并将超导对称性从s波切换为d波主导，为量子器件设计提供了通用超导平台并深化了配对机制认知。
AI中文摘要：
调控二维超导体中相互交织的电子序为回答基础问题和设计新型量子器件提供了有效途径。然而，调控竞争序之间的平衡通常需要复杂的化学手段、应力或界面工程。本文表明，非常规超导体FeSe的维度缩减是一种原始的替代方案。剥离会抑制块体的电子向列响应，并将超导对称性从块体s波切换为d波主导。输运、电子显微镜和拉曼光谱证实，薄样品的向列序显著减弱。为探测超导性，我们在原始晶体边缘进行了角依赖的安德烈夫反射光谱测量。随着结的取向旋转，光谱从零能束缚态演化为相干峰。注入角、磁场和温度依赖性，结合理论建模，证实剥离会切换超导对称性。我们的结果为设计量子序提供了通用的超导平台，并为潜在配对机制提供了新见解。
英文摘要：
Controlling intertwined electronic orders in two-dimensional superconductors offers an effective route to answering fundamental questions and engineering new quantum devices. However, tuning the balance between competing orders typically requires complex chemistry, strain, or interface engineering. Here, we show that a pristine alternative is the dimensional reduction of the unconventional superconductor FeSe. Exfoliation suppresses the bulk electronic nematic response and switches the superconducting symmetry from bulk s-wave to d-wave-dominant. Transport, electron microscopy, and Raman spectroscopy establish the substantial weakening of nematic order in thin flakes. To probe superconductivity, we perform angle-dependent Andreev reflection spectroscopy on pristine crystal edges. As the junction's orientation is rotated, the spectra evolve from zero-energy bound states to coherence peaks. The injection angle, field, and temperature dependence, along with theoretical modeling, confirm that exfoliation switches the superconducting symmetry. Our results suggest a versatile superconducting platform for engineering quantum orders and provide fresh insights into the underlying pairing mechanisms.
