Topological Landscape of Competing Charge Density Waves in 2H-NbSe2

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Title
Topological Landscape of Competing Charge Density Waves in 2H-NbSe2
Author(s)
Gyeongcheol Gye; Eunseok Oh; Han Woong Yeom
Publication Date
2019-01
Journal
PHYSICAL REVIEW LETTERS, v.122, no.1, pp.016403 -
Publisher
AMER PHYSICAL SOC
Abstract
Despite decades of studies of the charge density wave (CDW) of 2H-NbSe2, the origin of its incommensurate CDW ground state has not been understood. We discover that the CDW of 2H-NbSe2 is composed of two different, energetically competing, structures. The lateral heterostructures of two CDWs are entangled as topological excitations, which give rise to a CDW phase shift and the incommensuration without a conventional domain wall. A partially melted network of topological excitations and their vertices explain an unusual landscape of domains. The unconventional topological role of competing phases disclosed here can be widely applied to various incommensuration or phase coexistence phenomena in materials. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5579
ISSN
0031-9007
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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