Atomic diffusion-induced polarization and superconductivity in topological insulator-based heterostructures
发布时间：2023-12-27
点击次数：
- 所在单位：
- Ernst Ruska-Centre, Research Center Juelich
- 出版单位：
- ACS Nano
- 简介：
- The proximity effect at an s-wave superconductor (S) and a topological insulator (TI) provides a promising platform to create Majorana zero modes in artificially designed heterostructures. However, structural and chemical issues pertinent to such interfaces are poorly explored so far. Here, we report the discovery of Pd diffusion induced interfacial polarization in Pd1+x(Bi0.4Te0.6)2 and Pd-intercalated Bi2Te3 by using atomic-resolution scanning transmission electron microscopy. Our quantitative image analysis reveals that nanoscale lattice strain and QL polarity synergistically suppress and promote the Pd diffusion at the normal and parallel interfaces. First-principles calculations unveil that the superconductivity of xPBT phase and topological nature of Pd-intercalated Bi2Te3 phase are robust against the broken inversion symmetry. These findings point out the necessity of considering coexistence of electric polarization with superconductivity and topology in such S-TI systems.
- 著作类别：
- 论文
- 学科门类：
- 理学
- 是否译成外文：
- 否
