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강상관계 물질 연구단
강상관계 물질 연구단
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Direct Observation of Flatband Loop States Arising from Nontrivial Real-Space Topology

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Title
Direct Observation of Flatband Loop States Arising from Nontrivial Real-Space Topology
Author(s)
Jina Ma; Jun-Won Rhim; Liqin Tang; Shiqi Xia; Haiping Wang; Xiuyan Zheng; Shiqiang Xia; Daohong Song; Yi Hu; Yigang Li; Bohm-Jung Yang; Daniel Leykam; Zhigang Chen
Publication Date
2020-05
Journal
PHYSICAL REVIEW LETTERS, v.124, no.18, pp.183901 -
Publisher
AMER PHYSICAL SOC
Abstract
Topological properties of lattices are typically revealed in momentum space using concepts such as the Chern number. Here, we study unconventional loop states, namely, the noncontractible loop states (NLSs) and robust boundary modes, mediated by nontrivial topology in real space. While such states play a key role in understanding fundamental physics of flatband systems, their experimental observation has been hampered because of the challenge in realizing desired boundary conditions. Using a laser-writing technique, we optically establish photonic kagome lattices with both an open boundary by properly truncating the lattice, and a periodic boundary by shaping the lattice into a Corbin geometry. We thereby demonstrate the robust boundary modes winding around the entire edge of the open lattice and, more directly, the NLSs winding in a closed loop akin to that in a torus. We prove that the NLSs due to real-space topology persist in ideal Corbino-shaped kagome lattices of arbitrary size. Our results could be of great importance for our understanding of the singular flatbands and the intriguing physics phenomenon applicable for strongly interacting systems © 2020 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/7203
ISSN
0031-9007
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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