通过双轴应变对II型Weyl半金属候选体MoTe $_2$超导温度的急剧增强
Drastic enhancement of the superconducting temperature in type-II Weyl semimetal candidate MoTe$_2$ via biaxial strain
摘要：
第二类Weyl半金属候选体MoTe $_2$在T_c~0.1 K超导，是实现拓扑超导电性的理想候选体之一。然而，极低的$T_c$与小的上临界场（$H_{c2}$）相关联，这意味着仅存在于$H$ - $T$相图的小区域上的脆弱超导相。在这里，我们描述了一种简单而通用的方法，根据不同材料之间的差异热膨胀薄单晶MoTe $_2$的双轴应变。通过这种方法，我们成功地提高了$T_c$的MoTe $_2$的五倍，从而扩大了$H$ - $T$相图上的超导区域显着。为了证明在双轴应变的MoTe $_2$的超导性研究的相对容易，我们进一步提出的磁输运数据，使温度依赖的$H_{c2}$和各向异性的超导状态，否则将难以获得在一个独立的MoTe $_2$的研究。我们的工作表明，双轴应变是调节MoTe $_2$电子性质的有效方法。由于我们的方法简单，应用双轴应变，我们预计其直接适用于更广泛的一类量子材料。
英文摘要：
Type-II Weyl semimetal candidate MoTe$_2$, which superconducts at T_c~0.1 K, is one of the promising candidates for realizing topological superconductivity. However, the exceedingly low $T_c$ is associated with a small upper critical field ($H_{c2}$), implying a fragile superconducting phase that only exists on a small region of the $H$-$T$ phase diagram. Here, we describe a simple and versatile approach based on the differential thermal expansion between dissimilar materials to subject a thin single crystalline MoTe$_2$ to biaxial strain. With this approach, we successfully enhance the $T_c$ of MoTe$_2$ five-fold and consequently expand the superconducting region on the $H$-$T$ phase diagram significantly. To demonstrate the relative ease of studying the superconductivity in the biaxially strained MoTe$_2$, we further present the magnetotransport data, enabling the study of the temperature-dependent $H_{c2}$ and the anisotropy of the superconducting state which would otherwise be difficult to obtain in a free-standing MoTe$_2$. Our work shows that biaxial strain is an effective knob to tune the electronic properties of MoTe$_2$. Due to the simplicity of our methodology to apply biaxial strain, we anticipate its direct applicability to a wider class of quantum materials.
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