范德华反铁磁体NiPS₃中磁场可调的排斥性激子-激子相互作用
Magnetic Field-Tunable Repulsive Exciton-Exciton Interaction in the van der Waals Antiferromagnet NiPS$_3$
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中文总结 AI 辅助
本研究通过最高178 T的脉冲磁场磁光测量，发现NiPS₃中两个激子峰存在磁场可调的排斥耦合，为强关联激子物理研究提供了新平台。
中文摘要 AI 辅助
二维范德华晶体NiPS₃中存在两个约1.5 eV的超窄吸收峰，学界普遍认为其源于自旋轨道纠缠三重态到单重态的跃迁，因具有显著的自旋依赖特性而备受关注。一个有趣的问题是，超强磁场是否会改变这两个峰之间由相互作用驱动的杂化。本研究对NiPS₃进行脉冲磁场下的系统磁光测量，磁场最高达178 T，观测到两个尖锐激子峰间存在显著的相互排斥，同时伴随振子强度的重新分布，而在实验分辨率范围内，带边未出现可检测到的场致移动。我们构建了极简的二能级相互作用模型，并将其与实验数据进行半定量比较。研究结果表明，磁场可调的激子-激子耦合是NiPS₃在强场下的主要响应，该材料可作为探索磁性范德华绝缘体中强关联激子物理的新型实验平台。
英文摘要
Two ultra-narrow absorption peaks around 1.5 eV, which are widely believed to originate from a transition from a spin-orbital entangled triplet to a singlet state, in the two-dimensional van der Waals crystal NiPS$_3$, have attracted considerable attention because of their pronounced spin-dependent character. An interesting question is whether ultrahigh magnetic fields modify an interaction-driven hybridization between those two peaks. In this work we perform systematic magneto-optical measurements of NiPS$_3$ in pulsed magnetic fields of up to 178 T and observe a pronounced mutual repulsion between the two sharp exciton peaks accompanied by a redistribution of oscillator strength, while the band edge shows no detectable field-induced shift within our experimental resolution. We construct a minimal two-level interaction model and compare it semi-quantitatively with the experimental data. Our results reveal a magnetic-field-tunable exciton-exciton coupling as the dominant high-field response of NiPS$_3$, and clarify this material as a new experimental platform for exploring strongly correlated exciton physics in magnetic van der Waals insulators.
发表机构
- The Institute for Solid State Physics, The University of Tokyo（东京大学固体研究所）
- Department of Physics and Astronomy, Seoul National University (SNU)（首尔大学物理天文学系）
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