Multiple topological states in iron-based superconductors
Abstract
Topological insulators and semimetals as well as unconventional iron-based superconductors have attracted major recent attention in condensed matter physics. Previously, however, little overlap has been identified between these two vibrant fields, even though the principal combination of topological bands and superconductivity promises exotic unprecedented avenues of superconducting states and Majorana bound states (MBSs), the central building block for topological quantum computation. Along with progressing laser-based spin-resolved and angle-resolved photoemission spectroscopy (ARPES) towards high energy and momentum resolution, we have resolved topological insulator (TI) and topological Dirac semimetal (TDS) bands near the Fermi level () in the iron-based superconductors Li(Fe,Co)As and Fe(Te,Se), respectively. The TI and TDS bands can be individually tuned to locate close to by carrier doping, allowing to potentially access a plethora of different superconducting topological states in the same material. Our results reveal the generic coexistence of superconductivity and multiple topological states in iron-based superconductors, rendering these materials a promising platform for high- topological superconductivity.
Cite
@article{arxiv.1809.09977,
title = {Multiple topological states in iron-based superconductors},
author = {Peng Zhang and Zhijun Wang and Xianxin Wu and Koichiro Yaji and Yukiaki Ishida and Yoshimitsu Kohama and Guangyang Dai and Yue Sun and Cedric Bareille and Kenta Kuroda and Takeshi Kondo and Kozo Okazaki and Koichi Kindo and Xiancheng Wang and Changqing Jin and Jiangping Hu and Ronny Thomale and Kazuki Sumida and Shilong Wu and Koji Miyamoto and Taichi Okuda and Hong Ding and G. D. Gu and Tsuyoshi Tamegai and Takuto Kawakami and Masatoshi Sato and Shik Shin},
journal= {arXiv preprint arXiv:1809.09977},
year = {2019}
}
Comments
9 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1803.00846, arXiv:1803.00845