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Mobile Kink Solitons in a Van der Waals Charge-Density-Wave Layer

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Title
Mobile Kink Solitons in a Van der Waals Charge-Density-Wave Layer
Author(s)
Jinwon Lee; Jae Whan Park; Gil Young Cho; Han Woong Yeom
Publication Date
2023-07
Journal
Advanced Materials, v.35, no.29
Publisher
John Wiley and Sons Inc
Abstract
Kinks, point-like geometrical defects along dislocations, domain walls, and DNA, are stable and mobile, as solutions of a sine-Gordon wave equation. While they are widely investigated for crystal deformations and domain wall motions, electronic properties of individual kinks have received little attention. In this work, electronically and topologically distinct kinks are discovered along electronic domain walls in a correlated van der Waals insulator of 1T-TaS2. Mobile kinks and antikinks are identified as trapped by pinning defects and imaged in scanning tunneling microscopy. Their atomic structures and in-gap electronic states are unveiled, which are mapped approximately into Su–Schrieffer–Heeger solitons. The twelvefold degeneracy of the domain walls in the present system guarantees an extraordinarily large number of distinct kinks and antikinks to emerge. Such large degeneracy together with the robust geometrical nature may be useful for handling multilevel information in van der Waals materials architectures. © 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.
URI
https://pr.ibs.re.kr/handle/8788114/14216
DOI
10.1002/adma.202300160
ISSN
0935-9648
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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