论文标题
磁性变亮的深色电子 - phonon结合了van der waals抗fiferromagnet
Magnetically brightened dark electron-phonon bound states in a van der Waals antiferromagnet
论文作者
论文摘要
在范德华（vdw）材料中，不同自由度之间的强耦合可以将基本激发与具有混合特征的结合状态杂交。正确识别这些约束状态的性质和组成是理解其基态特性和激发光谱的关键。在这里，我们使用超快速光谱法揭示了2D VDW抗fiferromagnet nips3中的D-轨道和声子的结合状态。这些结合的状态通过频域中的相同的声子复制品表现出来。这些状态在Néel温度上方的光学上是深色的，并可以通过磁性秩序进入。通过启动此声子并在光谱跟踪其幅度，我们将界面状态的电子起源作为局部D-D激发。我们的数据直接产生电子偶联强度，该耦合强度超过了2D系统中已知值的最高值。这些结果证明了NIPS3是研究旋转，轨道和晶格之间强烈相互作用的平台，以及对2D磁体相干控制的开放途径。
In van der Waals (vdW) materials, strong coupling between different degrees of freedom can hybridize elementary excitations into bound states with mixed character. Correctly identifying the nature and composition of these bound states is key to understanding their ground state properties and excitation spectra. Here, we use ultrafast spectroscopy to reveal bound states of d-orbitals and phonons in 2D vdW antiferromagnet NiPS3. These bound states manifest themselves through equally spaced phonon replicas in frequency domain. These states are optically dark above the Néel temperature and become accessible with magnetic order. By launching this phonon and spectrally tracking its amplitude, we establish the electronic origin of bound states as localized d-d excitations. Our data directly yield electron-phonon coupling strength which exceeds the highest known value in 2D systems. These results demonstrate NiPS3 as a platform to study strong interactions between spins, orbitals and lattice, and open pathways to coherent control of 2D magnets.
