Year: 2015
Type: article
Abstract: We demonstrate, using first-principles calculations, that the electronic structure of ${\mathrm{FeSe}}_{1\ensuremath{-}x}{\mathrm{Te}}_{x}\phantom{\rule{0.28em}{0ex}}(x=0.5)$ is topologically nontrivial and characterized by an odd ${\mathbb{Z}}_{2}$ invariant and Dirac cone type surface states, in sharp contrast to the end member FeSe $(x=0)$. This topological state is induced by the enhanced three-dimensionality and spin-orbit coupling due to Te substitution (compared to FeSe), and characterized by a band inversion at the $Z$ point of the Brillouin zone, which is confirmed by our ARPES measurements. The results suggest that the surface of ${\mathrm{FeSe}}_{0.5}{\mathrm{Te}}_{0.5}$ may support a nontrivial superconducting channel in proximity to the bulk.
Source: Physical Review B
Authors: Zhijun Wang, P. Zhang, Gang Xu, L. K. Zeng, H. Miao, Xiaoyan Xu, T. Qian, Hongming Weng, P. Richard, A. V. Fedorov, H. Ding, Xi Dai, Zhong Fang
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2572973103