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<p>Axion electrodynamics, originally proposed by Frank Wilczek in the context of high energy physics, can manifest in condensed matter systems as an isotropic linear magnetoelectric (ME) response. Yet, experimental realization of a continuous and purely monopolar ME response has remained elusive. Here, we demonstrate such a response by transforming the topologically trivial antiferromagnet chromia into an isotropic ME medium. Using low-frequency AC ME susceptometry, supported by Monte Carlo simulations, we reveal a monopolar ME response <InlineEquation ID="IEq1"><EquationSource Format="TEX">\({\alpha }_{{ij}}=\theta {\delta }_{{ij}}\)</EquationSource><EquationSource Format="MATHML"><math><msub><mrow><mi>α</mi></mrow><mrow><mi>i</mi><mi>j</mi></mrow></msub><mo>=</mo><mi>θ</mi><msub><mrow><mi>δ</mi></mrow><mrow><mi>i</mi><mi>j</mi></mrow></msub></math></EquationSource></InlineEquation> resulting from suppressed quadrupolar contributions. The zero crossing of the temperature-dependent <i>θ</i> at 168 K provides direct evidence that the measured isotropic ME response arises from the axion contribution in chromia. These results establish a condensed-matter platform for axion electrodynamics and open pathways toward ME Hall effects, magnetophotovoltaic responses, and monopolar-based devices.</p>

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Axion electrodynamics in a topologically trivial antiferromagnet

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月20日

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  • Abhilash Mishra,
  • Robin Karothiya,
  • Syed Qamar Abbas Shah,
  • Arti Kashyap,
  • Christian Binek

摘要

Axion electrodynamics, originally proposed by Frank Wilczek in the context of high energy physics, can manifest in condensed matter systems as an isotropic linear magnetoelectric (ME) response. Yet, experimental realization of a continuous and purely monopolar ME response has remained elusive. Here, we demonstrate such a response by transforming the topologically trivial antiferromagnet chromia into an isotropic ME medium. Using low-frequency AC ME susceptometry, supported by Monte Carlo simulations, we reveal a monopolar ME response \({\alpha }_{{ij}}=\theta {\delta }_{{ij}}\)αij=θδij resulting from suppressed quadrupolar contributions. The zero crossing of the temperature-dependent θ at 168 K provides direct evidence that the measured isotropic ME response arises from the axion contribution in chromia. These results establish a condensed-matter platform for axion electrodynamics and open pathways toward ME Hall effects, magnetophotovoltaic responses, and monopolar-based devices.