Topological crystalline metal in orthorhombic perovskite iridates

Nature Communications
Yige ChenHae-Young Kee

Abstract

Since topological insulators were theoretically predicted and experimentally observed in semiconductors with strong spin-orbit coupling, increasing attention has been drawn to topological materials that host exotic surface states. These surface excitations are stable against perturbations since they are protected by global or spatial/lattice symmetries. Following the success in achieving various topological insulators, a tempting challenge now is to search for metallic materials with novel topological properties. Here we predict that orthorhombic perovskite iridates realize a new class of metals dubbed topological crystalline metals, which support zero-energy surface states protected by certain lattice symmetry. These surface states can be probed by photoemission and tunnelling experiments. Furthermore, we show that by applying magnetic fields, the topological crystalline metal can be driven into other topological metallic phases, with different topological properties and surface states.

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Citations

May 21, 2016·Proceedings of the National Academy of Sciences of the United States of America·Di YiRamamoorthy Ramesh
Jan 23, 2018·Reports on Progress in Physics·Gang Cao, Pedro Schlottmann
Sep 19, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ying-Hua DengHuai-Wu Zhang
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Aug 31, 2019·Science·QuanSheng WuTomáš Bzdušek
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