• Corpus ID: 219177269

Higher-Order Topological Instanton Tunneling Oscillation

  title={Higher-Order Topological Instanton Tunneling Oscillation},
  author={Moon Jip Park and Sunam Jeon and SungBin Lee and Hee Chul Park and Youngkuk Kim},
  journal={arXiv: Mesoscale and Nanoscale Physics},
We propose a new type of instanton interference effect in two-dimensional higher-order topological insulators. The intercorner tunneling consists of the instanton and the anti-instanton pairs that travel through the boundary of the higher-order topological insulator. The Berry phase difference between the instanton pairs causes the interference of the tunneling. This topological effect leads to the gate-tunable oscillation of the energy splitting between the corner states, where the oscillatory… 

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