Emergent topological states via digital(001)oxide superlattices  

作　　者：Zhiwei Liu Hongquan Liu Jiaji Ma Xiaoxuan Wang Gang Li Hanghui Chen 

机构地区：[1]Key Laboratory of Polar Materials and Devices,Ministry of Education,East China Normal University,200241,Shanghai,China [2]NYU-ECNU Institute of Physics,NYU Shanghai,200122,Shanghai,China [3]Department of Electronic Science,East China Normal University,200241,Shanghai,China [4]School of Physical Science and Technology,ShanghaiTech University,201210,Shanghai,China [5]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,201210,Shanghai,China [6]Department of Physics,New York University,New York,NY,10012,USA

出　　处：《npj Computational Materials》2022年第1期2015-2026,共12页计算材料学（英文）

基　　金：H.C.is supported by the National Natural Science Foundation of China under project number 11774236;the Ministry of Science and Technology of China under project number SQ2020YFE010418;Open Grant of State Key Laboratory of Low Dimensional Quantum Physics at Tsinghua University;G.L.is supported by NSF of China(Grant No.11874263);the Sino-German mobility program(M-0006);Shanghai Technology Innovation Action Plan 2020-Integrated Circuit Technology Support Program(Project No.20DZ1100605).

摘　　要：Oxide heterostructures exhibit many intriguing properties.Here we provide design principles for inducing multiple topological states in(001)(AMO_(3))_(1)/(AM′O_(3))_(1)oxide superlattices.Aided by first-principles calculations and model analysis,we show that a(SrMO_(3))_(1)/(SrM′O_(3))_(1)superlattice(M=Nb,Ta and M′=Rh,Ir)is a strong topological insulator with Z_(2)index(1;001).More remarkably,a(SrMoO_(3))1/(SrIrO_(3))_(1)superlattice exhibits multiple coexisting topological insulator(TI)and topological Dirac semi-metal(TDS)states.The TDS state has a pair of type-II Dirac points near the Fermi level and symmetry-protected Dirac node lines.The surface TDS Dirac cone is sandwiched by two surface TI Dirac cones in the energy-momentum space.The non-trivial topological properties arise from the band inversion between d orbitals of two dissimilar transition metal atoms and a particular parity property of(001)superlattice geometry.Our work demonstrates how to induce non-trivial topological states in(001)perovskite oxide heterostructures by rational design.

关 键 词：PROPERTIES TOPOLOGICAL TRIVIAL 

分 类 号：O17[理学—数学]