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

被引：35
|
作者：
Gye, Gyeongcheol [1 ,2 ]
Oh, Eunseok [1 ,2 ]
Yeom, Han Woong [1 ,2 ]
机构：
[1] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea
[2] Pohang Univ Sci & Technol POSTECH, Dept Phys, Pohang 37673, South Korea
来源：
PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 01期
关键词：
PHASE-TRANSITION; STATE; 2H-TASE2; DISCOMMENSURATIONS; SEPARATION;
D O I：
10.1103/PhysRevLett.122.016403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：5
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