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Researchers explored non-Hermitian physics using a non-Abelian gauge field, observing novel spectral braiding and bipolar skin effects in electric circuits. This work advances experimental non-Hermitian physics and device design.

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Area of Science:

  • * Quantum physics and condensed matter theory.
  • * Exploration of complex spectral topologies and non-Hermitian phenomena.

Background:

  • * Non-Hermitian systems exhibit unique spectral properties like braiding and the skin effect.
  • * Experimental studies have been limited to systems without or with Abelian gauge fields.

Purpose of the Study:

  • * To propose and experimentally implement a non-Abelian Hatano-Nelson model with a nonreciprocal U(2) gauge field.
  • * To investigate novel non-Hermitian phenomena induced by non-Abelian gauge fields.

Main Methods:

  • * Theoretical proposal of a non-Abelian Hatano-Nelson model.
  • * Experimental implementation using electric circuits.
  • * Observation of spectral braiding and skin effect modes.

Main Results:

  • * Demonstrated Hopf-link-shaped complex energy braiding.
  • * Observed bipolar skin effect under non-Abelian conditions.
  • * Experimental validation of the proposed model in electric circuits.

Conclusions:

  • * The study enriches the experimental landscape of non-Hermitian physics.
  • * Provides a pathway for designing multifunctional non-Hermitian devices.
  • * Highlights the significance of non-Abelian gauge fields in non-Hermitian systems.