Quantum spin liquids (QSL) have emerged as a captivating subject within interacting spin systems that exhibit no magnetic ordering even at the lowest temperature accessible experimentally. However, definitive experimental evidence remains elusive. In light of the recent surge in theoretical and experimental interest in the half-filled Hubbard model on a triangular lattice, which offers the potential for stabilizing a chiral QSL, we investigate the electromagnetic signatures of this phase to facilitate experimental detection. Utilizing a combination of parton mean-field theory and unbiased density-matrix renormalization group calculations, we systematically examine the electrical charge and orbital electrical current associated with a spinon excitation in the chiral QSL. Additionally, we calculate the longitudinal and transverse optical conductivities below the Mott gap. Furthermore, employing quantum field theory analysis, we unravel the connection between spinon excitations and emergent as well as physical gauge fields. Our results demonstrate that the chiral QSL phase exhibits a distinct electromagnetic response, even within a Mott insulator regime. This finding holds great potential for enabling the experimental detection of this long-sought-after phase.

量子自旋液体（QSL）已成为相互作用的自旋系统中的一个令人着迷的主题，即使在实验可达到的最低温度下，该系统也不会表现出磁有序性。然而，确切的实验证据仍然难以捉摸。鉴于最近对三角晶格上的半填充哈伯德模型的理论和实验兴趣激增，该模型提供了稳定手性 QSL 的潜力，我们研究了该相的电磁特征以促进实验检测。利用部分子平均场理论和无偏密度矩阵重整化群计算的结合，我们系统地研究了与手性 QSL 中自旋子激发相关的电荷和轨道电流。此外，我们还计算了莫特间隙以下的纵向和横向光导率。此外，利用量子场论分析，我们揭示了自旋激发与涌现以及物理规范场之间的联系。我们的结果表明，即使在莫特绝缘体范围内，手性 QSL 相也表现出独特的电磁响应。这一发现对于通过实验检测这一期待已久的相具有巨大的潜力。