Layer construction of topological crystalline insulator LaSbTe

查看全文 作　　者：YuTing [1,2]Qian;ZhiYun [1,3]Tan;Tan [1,2]Zhang;JiaCheng [1,2]Gao;ZhiJun [1,2]Wang;Zhong [1,2]Fang;Chen [1,2,4,5]Fang;HongMing [1,2,4,5]Weng 机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China;[3]School of Physics and Electronic Science,Zunyi Normal University,Zunyi 563006,China;[4]Songshan Lake Materials Laboratory,Dongguan 523808,China;[5]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China 出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2020年第63卷第10期,共7页 基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11504117,11674369,11925408,11921004,and11974395);the support from the Foundation of Guizhou Science and Technology Department(Grant No.QKHLHZ20177091);the support from the National Thousand-Young-Talents Program;the CAS Pioneer Hundred Talents Program;the National Natural Science Foundation of China;the support from the National Key Research and Development Program of China(Grant Nos.2016YFA0300600,2016YFA0302400,and 2018YFA0305700);the K.C.Wong Education Foundation(Grant No.GJTD-2018-01)。 摘　　要：Topological crystalline insulator(TCI)is one of the symmetry-protected topological states.Any TCI can be deformed into a simple product state of several decoupled two-dimensional(2 D)topologically nontrivial layers in its lattice respecting its crystalline symmetries called the layer construction(LC)limit.In this work,based on first-principles calculations we have revealed that both tetragonal LaSbTe(t-LaSbTe)and orthorhombic LaSbTe(o-LaSbTe)can be interpreted as stacking of 2 D topological insulators in each lattice space.The structural phase transition from t-LaSbTe to o-LaSbTe due to soft phonon modes demonstrates how the real space change can lead to the modification of topological states.Their symmetry-based indicators and topological invariants have been analyzed based on LC.We propose that LaSbTe is an ideal example demonstrating the LC paradigm,which bridges the crystal structures in real space to the band topology in momentum space. 关 键 词：layer construction topological crystalline insulator topological insulator LaSbTe