Strain driven emergence of topological non-triviality in YPdBi thin films.
Strain driven emergence of topological non-triviality in YPdBi thin films.
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DOI：
10.1038/s41598-021-86936-2
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发表时间：
2021-04-06
影响因子：
4.6
通讯作者：
Chatterjee R
中科院分区：
文献类型：
--
作者：
Bhardwaj V;Bhattacharya A;Srivastava S;Khovaylo VV;Sannigrahi J;Banerjee N;Mani BK;Chatterjee R
半霍斯勒化合物表现出各种显着的新特性，例如重费米子行为、非常规超导性和磁性。其中一些化合物已被预测具有拓扑上非平凡的电子结构。值得注意的是，最近的理论研究表明有可能通过应变工程在原本平凡的 half-Heusler 系统中引入非平凡的拓扑表面态。在这里，使用磁输运测量和基于 DFT 的第一原理模拟，我们展示了在 (100) MgO 上生长的 YPdBi 应变 [110] 取向薄膜的拓扑表面状态。这些拓扑表面态出现在纯粹由应变驱动的原本微不足道的半金属中。此外，我们观察到这些应变薄膜中超导性的开始，凸显了设计拓扑超导态的可能性。我们的结果证明了应变在薄膜系统中设计新颖的拓扑状态以开发下一代自旋电子器件中发挥的关键作用。
Half-Heusler compounds exhibit a remarkable variety of emergent properties such as heavy-fermion behaviour, unconventional superconductivity and magnetism. Several of these compounds have been predicted to host topologically non-trivial electronic structures. Remarkably, recent theoretical studies have indicated the possibility to induce non-trivial topological surface states in an otherwise trivial half-Heusler system by strain engineering. Here, using magneto-transport measurements and first principles DFT-based simulations, we demonstrate topological surface states on strained [110] oriented thin films of YPdBi grown on (100) MgO. These topological surface states arise in an otherwise trivial semi-metal purely driven by strain. Furthermore, we observe the onset of superconductivity in these strained films highlighting the possibility of engineering a topological superconducting state. Our results demonstrate the critical role played by strain in engineering novel topological states in thin film systems for developing next-generation spintronic devices.
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