通过皮秒应变脉冲探测CrSiTe₃中的磁维度交叉
Probing of magnetic dimensional crossover in CrSiTe$_{3}$ through picosecond strain pulses
AI总结：
研究通过皮秒声学应变脉冲探测CrSiTe₃中磁维度交叉，揭示了自旋波动对晶格的影响及超快载流子动力学特征。
摘要：
阐明二维范德华材料中长程磁序从其前驱体短程磁序（SRMO）的出现对基础研究和技术发展具有深远意义。然而，直接观测这种磁维度交叉（MDC）的复杂阶段仍是一个重大实验挑战。尽管磁电耦合提供了有前途的途径，但检测SRMO对晶格的微小响应仍具挑战性。最近利用二次谐波产生技术在范德华铁磁绝缘体中揭示了两步MDC。然而，通过时间分辨技术明确检测MDC仍不明确。为此，我们采用皮秒声学应变脉冲（由飞秒激光生成）首次通过磁电耦合探测MDC的不同阶段。通过分析应变脉冲在时间和频率域中随温度变化的形状，我们清楚地展示了自旋波动对晶格的细微影响。此外，超快载流子动力学也显示出MDC的特征。我们的测量为时间分辨实验表征磁性材料铺平了道路，这对于设计新一代基于自旋的光电设备至关重要。
英文摘要：
Elucidating the emergence of long-range magnetic ordering from its precursor short-range magnetic ordering (SRMO) in two-dimensional van der Waals materials holds profound implications for fundamental research and technological advancements. However, directly observing the intricate stages of this magnetic dimensional crossover (MDC) remains a significant experimental challenge. While magneto-elastic coupling offers a promising avenue, detecting the minute lattice response to SRMO proves challenging. Recent investigations utilizing second harmonic generation have unveiled a two-step MDC in a van der Waals ferromagnetic insulator. However, an unambiguous detection of MDC through the time-resolved techniques remains elusive. To meet this goal, we have executed an alternative approach by employing picosecond acoustic strain pulses generated by femtosecond lasers to probe the various stages of MDC through the magneto-elastic coupling for the first time. By analyzing the shape of the strain pulse in both the time and frequency domains as a function of temperature, we clearly demonstrate the detection of the subtle influence of spin fluctuations on the lattice. Additionally, the ultrafast carrier dynamics also show signatures of MDC. Our measurements pave the way towards characterizing magnetic materials in time-resolved experiments that are crucial in designing a new generation of spin-based optoelectronic devices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
