高温超导体中的微波诱导光磁效应

中文摘要 AI 辅助

我们报道了首次在高温超导体中实验观测到由微波驱动的稳态逆法拉第效应。圆偏振微波辐射在外延$\boldsymbol{\rm YBa_2Cu_3O_{7-\boldsymbol{\rm δ}}}$薄膜中产生依赖于螺旋度的响应，该响应通过零差霍尔输运法检测。这种光磁响应仅在临界温度$T_c$以下出现，在正常态下消失，且在线偏振激发下不存在依赖功率的对应效应。有效光磁转换效率达到$1.75\rm\boldsymbol{\rm T/(W·cm^{-2})}$，比光学基准值高出数个数量级。在更高微波功率下，当自生场超过下临界场$B_{c1}$时信号坍缩，标志着涡旋相滑移区的开始，随后在锁模涡旋-洗板谐波处重新出现。这些结果确立了稳态微波光磁效应可作为超导量子系统中无接触、非感应磁控及非平衡涡旋光谱的一种途径。

英文摘要

We report the first experimental observation of a steady-state, microwave-driven inverse Faraday effect in a high-temperature superconductor. Circularly polarized microwave radiation generates a helicity-dependent response in an epitaxial $\mathrm{YBa_2Cu_3O_{7-δ}}$ film, detected using homodyne Hall transport. The optomagnetic response emerges exclusively below $T_c$, vanishes in the normal state, and exhibits no power-dependent counterpart under linearly polarized excitation. The effective optomagnetic conversion reaches $1.75\,\mathrm{T}/(\mathrm{W\,cm^{-2}})$, surpassing optical benchmarks by several orders of magnitude. At higher microwave powers, the signal collapses when the self-generated field exceeds $B_{c1}$, marking the onset of a vortex phase-slip regime, and subsequently re-emerges at mode-locked vortex-washboard harmonics. These results establish steady-state microwave optomagnetism as a route to contactless, non-inductive magnetic control and nonequilibrium vortex spectroscopy in superconducting quantum systems.

发表机构

• University of Waterloo（滑铁卢大学）
• Waterloo Institute of Nanotechnology（滑铁卢纳米技术研究所）

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