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Transient non-Hermitian skin effect.

Zhongming Gu1, He Gao2, Haoran Xue3

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Summary
This summary is machine-generated.

Researchers demonstrate the non-Hermitian skin effect (NHSE) in a passive system without gain media. This transient NHSE utilizes virtual gain, enabling observation of skin mode localization in passive platforms.

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Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Wave phenomena

Background:

  • The non-Hermitian skin effect (NHSE) is a unique phenomenon in non-Hermitian systems, characterized by the accumulation of modes at the boundaries.
  • Observing the full evolution of NHSE typically requires gain media, which complicates system design and robustness.

Purpose of the Study:

  • To demonstrate the observation of the complete evolution of NHSE in a passive system.
  • To investigate the possibility of realizing NHSE without relying on gain media.

Main Methods:

  • Utilized a simple lattice model and acoustic ring resonators.
  • Employed complex-frequency excitation to induce a virtual gain effect.
  • Experimentally demonstrated NHSE in a totally passive system during a quasi-stationary stage.

Main Results:

  • Successfully observed transient non-Hermitian skin effect (NHSE) in a passive system.
  • Showcased the persistence of exact NHSE during a quasi-stationary stage without gain.
  • Confirmed that the localization character of skin modes can be witnessed and exploited despite general energy decay.

Conclusions:

  • Excitation plays a crucial role in realizing NHSE.
  • Passive systems can fully support the observation of NHSE's complete evolution.
  • Findings open avenues for studying non-Hermitian physics using diverse passive platforms.