Broken mirror symmetry tuned topological transport in PbTe/SnTe heterostructures

Article

关键词: CRYSTALLINE INSULATOR;    PHASE-TRANSITION;    SNTE;    MAGNETORESISTANCE;    SURFACE;    STATES;    SEMICONDUCTORS;    RESISTANCE;   

DOI  :  10.1103/PhysRevB.98.161301

来源: SCIE

【 摘 要 】

The tunability of topological surface states and the controllable opening of the Dirac gap are two keys for the study of topological crystalline insulators (TCIs). By constructing PbTe/SnTe heterostructures, we discover giant linear magnetoresistance (GLMR) (2150% under a magnetic field of 14 T at 2 K) and strong metallic behavior that are likely induced by Dirac fermions with a high carrier mobility. By decreasing the hole density in SnTe, a much weaker metallic behavior and two-dimensional weak antilocalization are exhibited in PbTe/SnTe heterostructures. This striking transport difference is attributed to the cubic-rhombohedral structural phase transition in SnTe and broken mirror symmetry effect. The revelation of lattice structural distortion and mirror symmetry breaking in a PbTe/SnTe heterostructure's transport properties is very significant to the fundamental research in topological matter, magnetoelectronics, and spintronics.

【 授权许可】

Free