气候变化领域集成服务门户(CCPortal): A fractional corner anomaly reveals higher-order topology

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DOI	10.1126/science.aba7604
	A fractional corner anomaly reveals higher-order topology
	Peterson C.W.; Li T.; Benalcazar W.A.; Hughes T.L.; Bahl G.
发表日期	2020
ISSN	10959203
起始页码	1114
结束页码	1118
卷号	368 期号:6495
英文摘要	Spectral measurements of boundary-localized topological modes are commonly used to identify topological insulators. For high-order insulators, these modes appear at boundaries of higher codimension, such as the corners of a two-dimensional material. Unfortunately, this spectroscopic approach is only viable if the energies of the topological modes lie within the bulk bandgap, which is not required for many topological crystalline insulators. The key topological feature in these insulators is instead fractional charge density arising from filled bulk bands, but measurements of such charge distributions have not been accessible to date. We experimentally measure boundary-localized fractional charge density in rotationally symmetric two-dimensional metamaterials and find one-fourth and one-third fractionalization. We then introduce a topological indicator that allows for the unambiguous identification of higher-order topology, even without in-gap states, and we demonstrate the associated higher-order bulk-boundary correspondence. Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
关键词	article writing
语种	英语
来源机构	Science (New York, N.Y.)
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133447
推荐引用方式 GB/T 7714	Peterson C.W.,Li T.,Benalcazar W.A.,et al. A fractional corner anomaly reveals higher-order topology[J]. Science (New York, N.Y.),2020,368(6495).
APA	Peterson C.W.,Li T.,Benalcazar W.A.,Hughes T.L.,&Bahl G..(2020).A fractional corner anomaly reveals higher-order topology.,368(6495).
MLA	Peterson C.W.,et al."A fractional corner anomaly reveals higher-order topology".368.6495(2020).