Two-Fold Anisotropic Superconductivity in Bilayer T$_d$-MoTe$_2$

Zizhong Li, Apoorv Jindal, Alex Strasser, Yangchen He, Wenkai Zheng, David Graf, Takashi Taniguchi, Kenji Watanabe, Luis Balicas, Cory R. Dean, Xiaofeng Qian, Abhay N. Pasupathy, Daniel A. Rhodes
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Abstract

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.
双层 T$_d$-MoTe$_2$ 中的双向各向异性超导性
具有大自旋轨道耦合的非五次对称二维超导体为探索远超过保利极限的超导行为提供了机会。其中一种超导体--少层 T$_d$-MoTe$_2$ 具有大临界上场,可超过保利极限达 600%。此外,最近还在双电层中观察到了与超导性同时存在的铁电性,在整个铁电转换途径中都可以观察到超导性的强烈变化。在这里,我们报告了双电层 T$_d$-MoTe$ _2$在平面内磁场下的超导行为,同时系统地改变了磁场角度和平面外电场强度。我们发现,双层 MoTe$_2$ 中的超导现象具有两重对称性,上临界磁场最大值沿 b 轴出现,最小值沿 a 轴出现。在整个超导区域和铁电磁滞回线中,这种二重旋转对称性始终保持稳固。我们对自旋轨道耦合强度(高达 16.4 meV)的实验观察结果与第一原理计算得出的自旋纹理和自旋分裂一致,表明倾斜伊辛自旋轨道耦合是主要的基本机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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