候选时间反演对称性破缺超导体BiNi中的太赫兹波段偏振旋转
Terahertz range polarization rotation in the candidate time-reversal symmetry breaking superconductor BiNi
AI总结：
本研究利用高精度太赫兹偏振测量技术，在零磁场下的BiNi双层超导体中观察到了迄今最小的偏振旋转和数百微弧度的低频克尔旋转，证实了时间反演对称性破缺，并通过分析支持了多带超导情景。
摘要：
本文报道了利用太赫兹（THz）偏振测量技术在BiNi双层中观察到时间反演对称性（TRS）破缺超导性。借助一种新型高精度THz偏振测量技术，我们在超导态和零磁场下检测到了迄今为止测得的最小THz光偏振旋转。通过将MgO衬底本身作为光学谐振腔，我们能够将法拉第旋转和克尔旋转相互参照。我们在超导相中观察到量级为数百微弧度的低频克尔旋转，这是与TRS破缺超导性一致的清晰特征。我们的测量使得能够直接获取THz范围的霍尔电导率。通过Kramers-Kronig分析，我们将这些低能测量与先前的高频磁光克尔效应（MOKE）数据联系起来。这种联系为TRS破缺态的本质提供了关键见解，支持多带超导情景，而非无序单带解释作为克尔效应的起源。
英文摘要：
Here we report the observation of time-reversal symmetry (TRS) breaking superconductivity in a BiNi bilayer using terahertz (THz) polarimetry. Leveraging a novel high-precision THz polarimetry technique, we detect, in the superconducting state and at zero magnetic field, the smallest polarization rotation of THz light measured to date. By using the MgO substrate itself as an optical resonator, we can reference the Faraday and Kerr rotations to each other. We observe a low-frequency Kerr rotation on the order of several hundred microradians in the superconducting phase, a clear signature consistent with TRS-breaking superconductivity. Our measurements enable direct access to the THz-range Hall conductivity. Through a Kramers-Kronig analysis, we link these low-energy measurements to prior high-frequency magneto-optic Kerr effect (MOKE) data. This connection provides critical insight into the nature of the TRS-breaking state, supporting a multiband superconducting scenario over a disordered single-band interpretation for the origin of the Kerr effect.
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