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Transport induced dimer state from topological corner states

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Abstract

Recently, a new type of second-order topological insulator has been theoretically proposed by introducing an in-plane Zeeman field into the Kane-Mele model in the two-dimensional honeycomb lattice. A pair of topological corner states arise at the corners with obtuse angles of an isolated diamond-shaped flake. To probe the corner states, we study their transport properties by attaching two leads to the system. Dressed by incoming electrons, the dynamic corner state is very different from its static counterpart. Resonant tunneling through the dressed corner state can occur by tuning the in-plane Zeeman field. At the resonance, the pair of spatially well separated and highly localized corner states can form a dimer state, whose wavefunction extends almost the entire bulk of the diamond-shaped flake. By varying the Zeeman field strength, multiple resonant tunneling events are mediated by the same dimer state. This re-entrance effect can be understood by a simple model. These findings extend our understanding of dynamic aspects of the second-order topological corner states.

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Author information

Authors and Affiliations

  1. College of Physics and Energy, Shenzhen University, Shenzhen, 518060, China

    Kai-Tong Wang

  2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Kai-Tong Wang

  3. Department of Physics, The University of Texas at Austin, Austin, Texas, 78712, USA

    Yafei Ren

  4. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Fuming Xu, Yadong Wei & Jian Wang

  5. Department of Physics, University of Hong Kong, Hong Kong, China

    Jian Wang

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  1. Kai-Tong Wang
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  2. Yafei Ren
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  3. Fuming Xu
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  5. Jian Wang
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Correspondence to Fuming Xu or Jian Wang.

Additional information

This work was supported by the National Natural Science Foundation of China (Grant No. 12034014), the Natural Science Foundation of Guangdong Province (Grant No. 2020A1515011418), and the Natural Science Foundation of Shenzhen (Grant Nos. JCYJ20190808152801642, and JCYJ20190808150409413).

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Wang, KT., Ren, Y., Xu, F. et al. Transport induced dimer state from topological corner states. Sci. China Phys. Mech. Astron. 64, 257811 (2021). https://doi.org/10.1007/s11433-020-1677-9

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