{
"id": "2003.09936",
"version": "v1",
"published": "2020-03-22T16:11:52.000Z",
"updated": "2020-03-22T16:11:52.000Z",
"title": "Engineering Corner States from Two-Dimensional Topological Insulators",
"authors": [
"Yafei Ren",
"Zhenhua Qiao",
"Qian Niu"
],
"categories": [
"cond-mat.mes-hall"
],
"abstract": "We theoretically demonstrate that the second-order topological insulator with robust corner states can be realized in two-dimensional $\\mathbb{Z}_2$ topological insulators by applying an in-plane Zeeman field. Zeeman field breaks the time-reversal symmetry and thus destroys the $\\mathbb{Z}_2$ topological phase. Nevertheless, it respects some crystalline symmetries and thus can protect the higher-order topological phase. By taking the Kane-Mele model as a concrete example, we find that spin-helical edge states along zigzag boundaries are gapped out by Zeeman field whereas in-gap corner state at the intersection between two zigzag edges arises, which is independent on the field orientation. We further show that the corner states are robust against the out-of-plane Zeeman field, staggered sublattice potentials, Rashba spin-orbit coupling, and the buckling of honeycomb lattices, making them experimentally feasible. Similar behaviors can also be found in the well-known Bernevig-Hughes-Zhang model.",
"revisions": [
{
"version": "v1",
"updated": "2020-03-22T16:11:52.000Z"
}
],
"analyses": {
"keywords": [
"engineering corner states",
"two-dimensional topological insulators",
"in-plane zeeman field",
"zeeman field breaks",
"topological phase"
],
"note": {
"typesetting": "TeX",
"pages": 0,
"language": "en",
"license": "arXiv",
"status": "editable"
}
}
}