双层T$_d$-MoTe$_2$中的二重各向异性超导
Two-Fold Anisotropic Superconductivity in Bilayer T$_d$-MoTe$_2$
AI总结：
本文通过调控面内磁场角度和面外电场，发现双层T$_d$-MoTe$_2$的超导上临界场沿b轴最大、沿a轴最小，呈现稳健的二重对称性，并结合实验与第一性原理计算证明倾斜伊辛自旋轨道耦合是主导机制。
摘要：
具有大自旋轨道耦合的非中心对称二维超导体为探索远超泡利极限的超导行为提供了机会。少层T$_d$-MoTe$_2$就是这样一种超导体，其具有大的上临界场，可超过泡利极限高达600%。然而，控制这种增强的机制仍存在争议，理论指出其可能源于自旋轨道宇称耦合或倾斜伊辛自旋轨道耦合。此外，最近在双层中观察到与超导相伴的铁电性，在整个铁电转变路径中可以观察到超导性的强烈变化。在此，我们报告了双层T$_d$-MoTe$_2$在面内磁场下的超导行为，同时系统地改变磁场角度和面外电场强度。我们发现双层MoTe$_2$中的超导性表现出二重对称性，上临界场最大值沿b轴出现，最小值沿a轴出现。二重旋转对称性在整个超导区域和铁电磁滞回线中保持稳健。我们对自旋轨道耦合强度（高达16.4 meV）的实验观测与第一性原理计算的自旋纹理和自旋劈裂一致，表明倾斜伊辛自旋轨道耦合是主导的底层机制。
英文摘要：
Noncentrosymmetric 2D superconductors with large spin-orbit coupling offer an opportunity to explore superconducting behaviors far beyond the Pauli limit. One such superconductor, few-layer T$_d$-MoTe$_2$, has large upper critical fields that can exceed the Pauli limit by up to 600%. However, the mechanisms governing this enhancement are still under debate, with theory pointing towards either spin-orbit parity coupling or tilted Ising spin-orbit coupling. Moreover, ferroelectricity concomitant with superconductivity has been recently observed in the bilayer, where strong changes to superconductivity can be observed throughout the ferroelectric transition pathway. Here, we report the superconducting behavior of bilayer T$_d$-MoTe$ _2$ under an in-plane magnetic field, while systematically varying magnetic field angle and out-of-plane electric field strength. We find that superconductivity in bilayer MoTe$_2$ exhibits a two-fold symmetry with an upper critical field maxima occurring along the b-axis and minima along the a-axis. The two-fold rotational symmetry remains robust throughout the entire superconducting region and ferroelectric hysteresis loop. Our experimental observations of the spin-orbit coupling strength (up to 16.4 meV) agree with the spin texture and spin splitting from first-principles calculations, indicating that tilted Ising spin-orbit coupling is the dominant underlying mechanism.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
