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arXiv 2412.01239cond-mat.mtrl-scicond-mat.str-el
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反铁磁体 FePS3 中电子极化的光致迟滞

Light-induced hysteresis of electronic polarization in antiferromagnet FePS3

Kyung Ik Sim, Byung Cheol Park, Taesoo Kim, Byeong Wook Cho, Jae Hoon Kim, Eun-Mi Choi, Young Hee Lee

AI总结:

该研究在反铁磁半导体 FePS3 中发现光子能量依赖的电子极化取向,并揭示 2.0 eV 下由八极极化和光致相对称性破缺导致的迟滞。

摘要:

利用光操控材料的研究已引起广泛关注,但在磁性材料中控制电子极化的实例仍然稀少。在此,我们通过光展示了反铁磁半导体 FePS3 中电子极化的迟滞现象。在 Néel 温度以下,我们观察到不存在结构对称性破缺的线性二向色性(即光学各向异性)。由于光使电荷从 armchair 方向转移到 zigzag 方向,光致净极化在 1.6 eV 时由偶极极化导致并沿 a 轴(zigzag 方向)排列,在 2.0 eV 时由偶极极化和八极极化的共同效应导致并沿 b 轴(armchair 方向)排列。与 1.6 eV 时不存在这种迟滞相反,电子极化在 2.0 eV 时出现由八极极化导致的意外迟滞。我们将其归因于 FePS3 光致相的对称性破缺,该破缺涉及自旋晶格内的电子极化。本研究提出了一种利用光在磁性材料中产生和控制电子极化的新机制,并对未来器件应用具有启示意义。

英文摘要:

Research on manipulating materials using light has garnered significant interest, yet examples of controlling electronic polarization in magnetic materials remain scarce. Here, we demonstrate the hysteresis of electronic polarization in the antiferromagnetic semiconductor FePS3 via light. Below the Néel temperature, we observe linear dichroism (i.e., optical anisotropy) without structural symmetry breaking. Light-induced net polarization aligns along the a-axis (zigzag direction) at 1.6 eV due to the dipolar polarization and along the b-axis (armchair direction) at 2.0 eV due to the combined effects of dipolar and octupolar polarizations, resulting from charge transfer from the armchair to the zigzag direction by light. Unexpected hysteresis of the electronic polarization occurs at 2.0 eV due to the octupolar polarization, in contrast to the absence of such hysteresis at 1.6 eV. We attribute this to a symmetry breaking of the light-induced phase of FePS3 involving electronic polarization within the spin lattice. This study suggests a new mechanism for generating and controlling electronic polarization in magnetic materials using light, with implications for future device applications.

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