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<p>Excitons are electronic excitations in semiconductors that mediate the interaction between light and matter. They underpin a wide range of phenomena from optoelectronics to nonlinear optics and sensors. Here we show that a bound exciton reservoir in the two-dimensional magnetic semiconductor CrSBr exerts a spin torque that coherently acts as damping-like and anti-damping-like torques. Crucially, this excitonic spin torque drives a non-trivial trajectory on the magnetic potential energy surface, enabling rapid and repeated switching between antiferromagnetic configurations from a single optical pulse. Unlike traditional spin torques that are fixed by heterostructure symmetry and interface design, this excitonic spin torque is an intrinsic material property. Our results establish excitons as a practical control knob for optospintronic devices, bidirectional quantum transducers, spintronic memory and studies of non-equilibrium magnetic phase transitions.</p>

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Excitonic spin torque in a magnetic semiconductor

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月15日

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  • Nicholas J. Brennan,
  • Jiacheng Tang,
  • Jalil Varela-Manjarres,
  • Chang Chang,
  • Daniel G. Chica,
  • Xiaoyang Zhu,
  • Xavier Roy,
  • Branislav K. Nikolić,
  • Yafei Ren,
  • Youn Jue Bae

摘要

Excitons are electronic excitations in semiconductors that mediate the interaction between light and matter. They underpin a wide range of phenomena from optoelectronics to nonlinear optics and sensors. Here we show that a bound exciton reservoir in the two-dimensional magnetic semiconductor CrSBr exerts a spin torque that coherently acts as damping-like and anti-damping-like torques. Crucially, this excitonic spin torque drives a non-trivial trajectory on the magnetic potential energy surface, enabling rapid and repeated switching between antiferromagnetic configurations from a single optical pulse. Unlike traditional spin torques that are fixed by heterostructure symmetry and interface design, this excitonic spin torque is an intrinsic material property. Our results establish excitons as a practical control knob for optospintronic devices, bidirectional quantum transducers, spintronic memory and studies of non-equilibrium magnetic phase transitions.