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Observation of continuum Landau modes in non-Hermitian electric circuits

Author

Listed:
  • Xuewei Zhang

    (Zhengzhou University
    Shanxi University)

  • Chaohua Wu

    (Zhengzhou University)

  • Mou Yan

    (Zhengzhou University
    Institute of Quantum Materials and Physics, Henan Academy of Sciences)

  • Ni Liu

    (Shanxi University)

  • Ziyu Wang

    (Wuhan University)

  • Gang Chen

    (Zhengzhou University
    Shanxi University)

Abstract

Continuum Landau modes — predicted recently in a non-Hermitian Dirac Hamiltonian under a uniform magnetic field — are continuous bound states with no counterparts in Hermitian systems. However, they have still not been confirmed in experiments. Here, we report an experimental observation of continuum Landau modes in non-Hermitian electric circuits, in which the non-Hermitian Dirac Hamiltonian is simulated by non-reciprocal hoppings and the pseudomagnetic field is introduced by inhomogeneous complex on-site potentials. Through measuring the admittance spectrum and the eigenstates, we successfully verify key features of continuum Landau modes. Particularly, we observe the exotic voltage response acting as a rainbow trap or wave funnel through full-field excitation. This response originates from the linear relationship between the modes’ center position and complex eigenvalues. Our work builds a bridge between non-Hermiticity and magnetic fields, and thus opens an avenue to explore exotic non-Hermitian physics.

Suggested Citation

  • Xuewei Zhang & Chaohua Wu & Mou Yan & Ni Liu & Ziyu Wang & Gang Chen, 2024. "Observation of continuum Landau modes in non-Hermitian electric circuits," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46122-0
    DOI: 10.1038/s41467-024-46122-0
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    References listed on IDEAS

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