Building topologic device through emerging robust helical surface states

ORAL

Abstract

In a 3D $Cd_3As_2$ ribbon with proper sizes, the system can exhibit a unique finite-size effect. Namely, if magnetic impurities are doped on one side, the surface states on the other side can be altered according to the strengths of these magnetic impurities. As a result, the conductance of the system will also be changed. This finding can be explained by the backscattering between the hybridized surface states due to finite size confinement and the normal surface states. Moreover, this phenomenon can be used to build new topologic devices.

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Authors

  • Zibo Wang

    International Center for Quantum Materials, Peking University, Beijing, China

  • Hua Jiang

    College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, China, College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, China

  • X.C. Xie

    International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China, International Center for Quantum Materials, Peking University, Beijing, China