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<p>Chiral cavities offer an intriguing way to manipulate material properties by breaking fundamental symmetries. However, only a few chiral cavity implementations exhibiting broken time-reversal symmetry have been demonstrated, with most relying on either strong magnetic fields, circularly polarized Floquet driving, or ultrastrong coupling between cavity modes and matter excitations. Here, we present a one-dimensional terahertz photonic-crystal cavity that exhibits broken time-reversal symmetry. The cavity consists of a silicon wafer sandwiched between InSb wafers. By exploiting the nonreciprocal terahertz response of a magnetoplasma and the low electron effective mass in InSb, a circularly polarized cavity mode at 0.67 THz under a modest magnetic field of 0.3 T, with a quality factor exceeding 50 is realized. Temperature-, magnetic field-, and polarization-dependent measurements and simulations demonstrate the chiral cavity with broken time-reversal symmetry, providing a robust platform for exploring chiral light–matter interactions and vacuum dressed quantum condensed matter in the terahertz regime.</p>

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Realization of a chiral photonic-crystal cavity with broken time-reversal symmetry

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月23日

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  • Kiran M. Kulkarni,
  • Hongjing Xu,
  • Fuyang Tay,
  • Gustavo M. Rodriguez-Barrios,
  • Dasom Kim,
  • Alessandro Alabastri,
  • Vasil Rokaj,
  • Ceren B. Dag,
  • Andrey Baydin,
  • Junichiro Kono

摘要

Chiral cavities offer an intriguing way to manipulate material properties by breaking fundamental symmetries. However, only a few chiral cavity implementations exhibiting broken time-reversal symmetry have been demonstrated, with most relying on either strong magnetic fields, circularly polarized Floquet driving, or ultrastrong coupling between cavity modes and matter excitations. Here, we present a one-dimensional terahertz photonic-crystal cavity that exhibits broken time-reversal symmetry. The cavity consists of a silicon wafer sandwiched between InSb wafers. By exploiting the nonreciprocal terahertz response of a magnetoplasma and the low electron effective mass in InSb, a circularly polarized cavity mode at 0.67 THz under a modest magnetic field of 0.3 T, with a quality factor exceeding 50 is realized. Temperature-, magnetic field-, and polarization-dependent measurements and simulations demonstrate the chiral cavity with broken time-reversal symmetry, providing a robust platform for exploring chiral light–matter interactions and vacuum dressed quantum condensed matter in the terahertz regime.