DeCrescent Ryan A, Kennard Rhys M, Chabinyc Michael L, Schuller Jon A
Department of Physics, University of California Santa Barbara, Santa Barbara, California 93106, USA.
Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA.
Phys Rev Lett. 2021 Oct 22;127(17):173604. doi: 10.1103/PhysRevLett.127.173604.
The optical response of crystals is most commonly attributed to electric dipole interactions between light and matter. Although metamaterials support "artificial" magnetic resonances supported by mesoscale structuring, there are no naturally occurring materials known to exhibit a nonzero optical-frequency magnetic polarizability. Here, we experimentally demonstrate and quantify a naturally occurring nonzero magnetic polarizability in a layered semiconductor system: two-dimensional (Ruddlesden-Popper phase) hybrid organic-inorganic perovskites. These results demonstrate the only known material with an optical-frequency permeability that differs appreciably from vacuum, informing future efforts to find, synthesize, or exploit atomic-scale optical magnetism for novel optical phenomena such as negative index of refraction and electromagnetic cloaking.
晶体的光学响应通常归因于光与物质之间的电偶极相互作用。尽管超材料支持由中尺度结构产生的“人工”磁共振，但目前还没有已知的天然材料表现出非零的光频磁极化率。在此，我们通过实验证明并量化了一种层状半导体系统——二维（Ruddlesden-Popper相）有机-无机杂化钙钛矿中天然存在的非零磁极化率。这些结果证明了这种已知材料的光频磁导率与真空有明显差异，为未来寻找、合成或利用原子尺度的光学磁性以实现诸如负折射率和电磁隐身等新型光学现象的研究工作提供了依据。
