论文标题
单声道1T'-WTE2中介导的非常规超导性的软模式声子
The soft-mode phonons mediated unconventional superconductivity in monolayer 1T'-WTe2
论文作者
论文摘要
最近的实验调整了单层1T'-WTE2，以通过静电门控为超导。在这里，我们从理论上研究了单层1T'-WTE2中的声子介导的超导性，这是通过电荷掺杂的。我们揭示了具有特定动量的软模式声子的出现对于产生电子兴奋剂方向的超导性至关重要，而没有这样的软模式声子和孔掺杂方案中没有超导性的超导性。我们还发现了一个超导圆顶，这可以归因于费米表面嵌套条件的变化，因为电子掺杂。通过考虑实验建立的强度依赖温度依赖性上临界场h_ {C2}之间的强大各向异性，我们表明，超导状态可能具有在c_ {2H}点组的a_ {u}通道中具有非常规的相等旋转 - 跨度 - 跨度 - 跨度的旋转。我们的研究为单层1T'-WTE2中H_ {C2}的掺杂依赖性超导性和强度的各向异性提供了有希望的理解。
Recent experiments have tuned the monolayer 1T'-WTe2 to be superconducting by electrostatic gating. Here, we theoretically study the phonon-mediated superconductivity in monolayer 1T'-WTe2 via charge doping. We reveal that the emergence of soft-mode phonons with specific momentum is crucial to give rise to the superconductivity in electron-doping regime, whereas no such soft-mode phonons and no superconductivity emerge in hole-doping regime. We also find a superconducting dome, which can be attributed to the change of Fermi surface nesting condition as electron doping. By taking into account the experimentally established strong anisotropy of temperature-dependent upper critical field H_{c2} between the in-plane and out-of-plane directions, we show that the superconducting state probably has the unconventional equal-spin-triplet pairing in A_{u} channel of C_{2h} point group. Our studies provide a promising understanding to the doping dependent superconductivity and strong anisotropy of H_{c2} in monolayer 1T'-WTe2.
