Dislocation Majorana zero modes in perovskite oxide 2DEG

作者：Chung, Suk Bum^*; Chan, Cheung^*; Yao, Hong^*

来源：Scientific Reports, 2016, 6(1): 25184.

DOI：10.1038/srep25184

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Much of the current experimental efforts for detecting Majorana zero modes have been centered on probing the boundary of quantum wires with strong spin-orbit coupling. The same type of Majorana zero mode can also be realized at crystalline dislocations in 2D superconductors with the nontrivial weak topological indices. Unlike at an Abrikosov vortex, at such a dislocation, there is no other lowlying midgap state than the Majorana zero mode so that it avoids usual complications encountered in experimental detections such as scanning tunneling microscope (STM) measurements. We will show that, using the anisotropic dispersion of the t(2g) orbitals of Ti or Ta atoms, such a weak topological superconductivity can be realized when the surface two-dimensional electronic gas (2DEG) of SrTiO3 or KTaO3 becomes superconducting, which can occur through either intrinsic pairing or proximity to existing s-wave superconductors.

• 出版日期2016-5-3
• 单位清华大学