Seminars & Lectures
| * TITLE | Evidence of Higher Order Topology in Multilayer WTe2 from Josephson Coupling through Anisotropic Hinge States | ||||||
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| * DATE / TIME | 2020-06-25, 14:00-15:00 | ||||||
| * PLACE | #512, Hogil Kim Memorial Bldg. & ZOOM Webinar | ||||||
| * ABSTRACT | |||||||
| Non-centrosymmetric Td-WTe2, a type-II Weyl semimetal, is also expected to have higher order topological phases with topologically protected, helical one-dimensional (1D) hinge states when its Weyl points are annihilated. However, the detection of these hinge states is difficult due to the semimetallic behaviour of its bulk. Here, we spatially resolve hinge states by analysing the magnetic field interference of supercurrent in Nb-WTe2-Nb proximity Josephson junctions. The Josephson current along the a-axis of the WTe2 crystal, but not along the b-axis, shows sharp enhancements at the edges of the junction; the amount of enhanced Josephson current was comparable to the upper limits of a single 1D helical channel. Our experimental observations suggest a higher order topological phase in WTe2 and its corresponding anisotropic topological hinge states, in agreement with theoretical calculations. Our work paves the way for the study of hinge states in topological transition metal dichalcogenides and analogous phases. ■ On-site You can participate in the lecture series directly on-site at seminar room #503 of the Center. ■ ZOOM Webinar 1) Click the following link https://zoom.us/j/93504787221?pwd=ZmttMzJvRlo0S0ZVcjIzMUJpSXdEdz09 2) Join the webinar with your email account and name |
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