远程磁振子传感探测Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$中的普适相位刚度跳变
Remote magnon sensing detects the universal phase stiffness jump in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$
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中文总结 AI 辅助
本文利用CrSBr中的传播磁振子作为远程传感器，非接触测量Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$的超导相位刚度，并直接观察普适相位刚度跳变，揭示场控制的二维相位有序转变。
中文摘要 AI 辅助
相位刚度控制着超流体和超导体中的宏观量子相干性，为凝聚体耗损、涨落和相变提供了灵敏的探针。然而，定量且空间分辨的测量仍然具有挑战性。本文报道了一种利用传播的反铁磁磁振子作为远程传感器的非接触、局域、全光学的超导相位刚度测量方法。在CrSBr中，强激子-磁振子耦合使得能够光学激发和探测磁振子波包，并精确确定其群速度。当CrSBr与欠掺杂的Bi$_2$Sr$_2$CaCu$_2$O$_{8+\beta}$界面接触时，我们发现磁振子群速度在超导转变以下显著增强，并通过Meissner屏蔽电流定量地编码相位刚度。利用这一能力，我们通过直接观察普适的相位刚度跳变，识别了平行场诱导的Berezinskii-Kosterlitz-Thouless转变，揭示了一种场控制的途径，以暴露体相铜氧化物中固有的二维相位有序物理。我们的工作确立了传播磁振子作为低维量子材料中超导电动力学和相位相干现象的局域探针。
英文摘要
Phase stiffness governs macroscopic quantum coherence in superfluids and superconductors, providing a sensitive probe of condensate depletion, fluctuations, and phase transitions. However quantitative and spatially resolved measurements remain challenging. Here we report a contactless, local, all-optical measurement of superconducting phase stiffness using propagating antiferromagnetic magnons as remote sensors. In CrSBr, strong exciton-magnon coupling enables optical excitation and detection of magnon wavepackets and precise determination of their group velocity. When CrSBr is interfaced with underdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$, we find that the magnon group velocity is substantially enhanced below the superconducting transition and quantitatively encodes the phase stiffness through Meissner screening currents. Using this capability, we identify a parallel-field-induced Berezinskii-Kosterlitz-Thouless transition through direct observation of the universal phase-stiffness jump, revealing a field-controlled route to expose intrinsic two-dimensional phase-ordering physics in a bulk cuprate. Our work establishes propagating magnons as local probes of superconducting electrodynamics and phase-coherent phenomena in low-dimensional quantum materials.
发表机构
- University of Washington（华盛顿大学）
- Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）
- University of Chemistry and Technology Prague（布拉格化学与技术大学）
- Columbia University（哥伦比亚大学）
- National Institute for Materials Science（物质材料研究机构）
- National Institute of Advanced Industrial Science and Technology（产业技术综合研究所）
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