Skip to main content

Chiral Majorana Fermion Modes on the Surface of Superconducting Topological Insulators

Author(s): Chiu, Ching-Kai; Bian, Guang; Zheng, Hao; Yin, Jiaxin; Zhang, Songtian S.; et al

To refer to this page use:
Abstract: The surface of superconducting topological insulators (STIs) has been recognized as an effective $p\pm ip$ superconductivity platform for realizing elusive Majorana fermions. Chiral Majorana modes (CMMs), which are different from Majorana bound states localized at points, can be achieved readily in experiments by depositing a ferromagnetic overlayer on top of the STI surface. Here we simulate this heterostructure by employing a realistic tight-binding model and show that the CMM appears on the edge of the ferromagnetic islands only after the superconducting gap is inverted by the exchange coupling between the ferromagnet and the STI. In addition, multiple CMMs can be generated by tuning the chemical potential of the topological insulator. These results can be applied to both proximity-effect induced superconductivity in topological insulators and intrinsic STI compounds such as PbTaSe$_2$, BiPd and their chemical analogues, providing a route to engineering CMMs in those materials.
Publication Date: 21-Sep-2018
Citation: Chiu, C.-K.; Bian, G.; Zheng, H.; Yin, J.-X.; Zhang, S. S.; Sanchez, D. S.; Belopolski, I.; Xu, S.-Y.; Hasan, M. Z. Chiral Majorana Fermion Modes on the Surface of Superconducting Topological Insulators. EPL (Europhysics Letters) 2018, 123 (4), 47005.
DOI: doi:10.1209/0295-5075/123/47005
ISSN: 0295-5075
EISSN: 1286-4854
Pages: 1 - 16
Type of Material: Journal Article
Journal/Proceeding Title: EPL (Europhysics Letters)
Version: Author's manuscript

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.