Glide symmetry protected higher-order topological insulators from semimetals with butterfly-like nodal lines  

作　　者：Xiaoting Zhou Chuang-Han Hsu Cheng-Yi Huang Mikel Iraola Juan L.Mañes Maia G.Vergniory Hsin Lin Nicholas Kioussis 

机构地区：[1]Department of Physics and Astronomy,California State University,Northridge,CA 91330,USA [2]Department of Electrical and Computer Engineering,Faculty of Engineering,National University of Singapore,Singapore 117583,Singapore [3]Institute of Physics,Academia Sinica,Taipei 115201,Taiwan [4]Donostia International Physics Center,Donostia-San Sebastian 20018,Spain [5]Department of Condensed Matter Physics,University of the Basque Country UPV/EHU,Apartado 644,Bilbao 48080,Spain [6]IKERBASQUE,Basque Foundation for Science,Maria Diaz de Haro 3,Bilbao 48013,Spain

出　　处：《npj Computational Materials》2021年第1期1871-1876,共6页计算材料学（英文）

基　　金：The work at CSUN was supported by NSF-Partnership in Research and Education in Materials(PREM)Grant No.DMR-1828019;H.L.acknowledges the support by the Ministry of Science and Technology(MOST)in Taiwan under grant number MOST 109-2112-M-001-014-MY3;The work of J.L.M.has been supported by Spanish Science Ministry grant PGC2018-094626-B-C21(MCIU/AEI/FEDER,EU)and Basque Government grant IT979-16;M.G.V.thanks support from DFG INCIEN2019-000356 from Gipuzkoako Foru Aldundia;M.G.V.and M.I.acknowledges the Spanish Ministerio de Ciencia e Innovacion(grant number PID2019-109905GB-C21).

摘　　要：Most topological insulators(TIs)discovered today in spinful systems can be transformed from topological semimetals(TSMs)with vanishing bulk gap via introducing the spin-orbit coupling(SOC),which manifests the intrinsic links between the gapped topological insulator phases and the gapless TSMs.Recently,we have discovered a family of TSMs in time-reversal invariant spinless systems,which host butterfly-like nodal-lines(NLs)consisting of a pair of identical concentric intersecting coplanar ellipses(CICE).In this Communication,we unveil the intrinsic link between this exotic class of nodal-line semimetals(NLSMs)and a Z_(4)=2 topological crystalline insulator(TCI),by including substantial SOC.We demonstrate that in three space groups(i.e.,Pbam(No.55),P4/mbm(No.127),and P4_(2)/mbc(No.135)),the TCI supports a fourfold Dirac fermion on the(001)surface protected by two glide symmetries,which originates from the intertwined drumhead surface states of the CICE NLs.The higher order topology is further demonstrated by the emergence of one-dimensional helical hinge states,indicating the discovery of a higher order topological insulator protected by a glide symmetry.

关 键 词：topological protected INSULATOR 

分 类 号：TM21[一般工业技术—材料科学与工程]