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Spinful hinge states in the higher-order topological insulators WTe2

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Title
Spinful hinge states in the higher-order topological insulators WTe2
Author(s)
Lee, Jekwan; Kwon, Jaehyeon; Lee, Eunho; Park, Jiwon; Soonyoung Cha; Watanabe, Kenji; Taniguchi, Takashi; Moon-Ho Jo; Choi, Hyunyong
Publication Date
2023-03
Journal
Nature Communications, v.14, no.1
Publisher
Nature Research
Abstract
Higher-order topological insulators are recently discovered quantum materials exhibiting distinct topological phases with the generalized bulk-boundary correspondence. Td-WTe2 is a promising candidate to reveal topological hinge excitation in an atomically thin regime. However, with initial theories and experiments focusing on localized one-dimensional conductance only, no experimental reports exist on how the spin orientations are distributed over the helical hinges—this is critical, yet one missing puzzle. Here, we employ the magneto-optic Kerr effect to visualize the spinful characteristics of the hinge states in a few-layer Td-WTe2. By examining the spin polarization of electrons injected from WTe2 to graphene under external electric and magnetic fields, we conclude that WTe2 hosts a spinful and helical topological hinge state protected by the time-reversal symmetry. Our experiment provides a fertile diagnosis to investigate the topologically protected gapless hinge states, and may call for new theoretical studies to extend the previous spinless model. © 2023, The Author(s).
URI
https://pr.ibs.re.kr/handle/8788114/13739
DOI
10.1038/s41467-023-37482-0
ISSN
2041-1723
Appears in Collections:
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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