Enhanced superconductivity in bilayer PtTe2 by alkali-metal intercalations
Enhanced superconductivity in bilayer PtTe2 by alkali-metal intercalations
复制标题
通过碱金属插层增强双层 PtTe2 的超导性
DOI：
10.1103/physrevb.103.224502
复制
发表时间：
2021-05
影响因子：
3.7
通讯作者：
Zheng Feipeng
中科院分区：
文献类型：
--
作者：
Wu Danhong;Lin Yiping;Xiong Lingxiao;Li Junjie;Luo Tiantian;Chen Deyi;Zheng Feipeng
层状铂碲（PtTe 2）最近合成的可控层数下降到单层的限制。利用基于各向异性Midgal-Eliashberg理论的从头计算方法，我们发现在自旋轨道耦合（SOC）存在下，通过铷（Rb）的插入，双层PtTe 2中的弱超导电性可以得到显著的提高，超导Tc = 8 K.嵌入物一方面介导层间耦合，并作为电子供体，导致费米能的大的态密度。另一方面，它增加了质量增强参数，电子-声子耦合强度与Pt相当。的钾插入双层PtTe 2具有可比的Tc的情况下，Rb嵌入。相对较高的Tc与SOC结合实验可访问的晶体结构表明，这些超导体是有前途的平台，研究新的量子物理与二维超导性，如最近提出的II型伊辛超导。
Layered platinum tellurium (PtTe2) was recently synthesized with controllable layer numbers down to a monolayer limit. Using ab initio calculations based on anisotropic Midgal-Eliashberg formalism, we show that by rubidium (Rb) intercalation, weak superconductivity in bilayer PtTe2 can be significantly boosted with superconducting Tc = 8 K in the presence of spin-orbit coupling (SOC). The intercalant on one hand mediates the interlayer coupling and serves as an electron donor, leading to large density of states at Fermi energy. On the other hand, it increases the mass-enhancement parameter with electron-phonon coupling strength comparable to that of Pt. The potassium intercalated bilayer PtTe2 has a comparable Tc to the case of Rb intercalation. The relatively high Tc with SOC combined with experimental accessible crystal structures suggest that these superconductors are promising platforms to study the novel quantum physics associated with two-dimensional superconductivity, such as the recently proposed type-II Ising superconductivity.