Two-Dimensional Quadrupole Topological Insulator in γ-Graphyne

Nano Letters
Bing LiuZ F Wang

Abstract

Two-dimensional quadrupole topological insulator (2D QTI), as a new class of second-order topological phases, has been experimentally confirmed in various artificial systems recently. However, its realization in electronic materials has seldom been reported. In this work, we predict that the experimentally synthesized γ-graphyne is a large-gap (∼0.2 eV) 2D QTI. Three characterized features for 2D QTI are simultaneously observed in γ-graphyne: quantized finite bulk quadrupole moment, gapped topological edge states, and in-gap topological corner states. Intriguingly, we found that gapped topological edge states exist on armchair edge with C≡C (but not C-C) termination, and in-gap topological corner states exist at corner with 120° (but not 60°) termination, which can be explained by different edge-hopping textures and corner chiral charges. Moreover, the robustness of in-gap topological corner states is further identified by varying edge-disorder and system-size calculations. Our results demonstrate a realistic electronic material for large-gap 2D QTI, which is expected to draw immediate experimental attention.

References

Jun 5, 1989·Physical Review Letters·J Zak
Dec 31, 2005·Physical Review Letters·C L Kane, E J Mele
Dec 16, 2006·Science·B Andrei BernevigShou-Cheng Zhang
Jun 25, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Guodong YuYisong Zheng
Jan 22, 2014·Chemical Society Reviews·Yongjun LiYuliang Li
Jan 25, 2013·Physical Review Letters·Fan ZhangE J Mele
May 14, 2016·Reports on Progress in Physics·Yafei RenQian Niu
Sep 8, 2016·Nature Communications·Z F WangFeng Liu
Mar 4, 2017·Physical Review Letters·Feng Liu, Katsunori Wakabayashi
Jul 8, 2017·Science·Wladimir A BenalcazarTaylor L Hughes
Dec 30, 2017·Physical Review Letters·Josias LangbehnPiet W Brouwer
Dec 30, 2017·Physical Review Letters·Zhida SongChen Fang
Jan 16, 2018·Nature·Marc Serra-GarciaSebastian D Huber
Apr 18, 2018·ACS Applied Materials & Interfaces·Jun KangJingbo Li
Jun 6, 2018·Science Advances·Frank SchindlerTitus Neupert
Oct 24, 2018·Nature Physics·Frank SchindlerTitus Neupert
Nov 24, 2018·Physical Review Letters·Chen-Hsuan HsuDaniel Loss
Jan 2, 2019·Nature Materials·Haoran XueBaile Zhang
Apr 2, 2019·Physical Review Letters·Feng LiuKatsunori Wakabayashi
Jan 11, 2020·Physical Review Letters·Xian-Lei ShengShengyuan A Yang

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Citations

Dec 7, 2019·Physical Review Letters·Moon Jip ParkSungBin Lee
May 10, 2020·Physical Review Letters·Yafei RenQian Niu
Feb 27, 2021·Physical Review Letters·Bing LiuZ F Wang
Jul 14, 2020·Nano Letters·Gan ZhaoZhengfei Wang
Oct 14, 2021·Scientific Reports·Yuichi OtsukaYasuhiro Hatsugai
Oct 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jiaojiao GuoShiping Feng
Oct 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Susmita JanaDebnarayan Jana

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