[9p-Z17-1~22] 3.1 光学基礎・光学新領域

▲ [9p-Z17-4] Terahertz Magneto-Spectroscopy Mapping of the Low-Temperature Phase Transition of Er_xY_1-xFeO₃

〇(D)Nicolas Marquez Peraca¹、Xinwei Li¹、Motoaki Bamba^2,3、Chien-Lung Huang¹、Xiaoxuan Ma⁴、Takuma Makihara¹、Emilia Morosan¹、Shixun Cao⁴、Junichiro Kono¹ (1.Rice University、2.Kyoto University、3.PRESTO、4.Shanghai University)

キーワード：ultrastrong, terahertz, orthoferrites

In this work, we have studied the low temperature properties of the rare-earth orthoferrite Er_xY_1-xFeO₃ using terahertz (THz) time-domain magnetospectroscopy. Comparison of the theoretical predictions with actual observations revealed that the phase transition this material exhibits can be modeled using an extended Dicke Hamiltonian that incorporates short-range Er-Er exchange interactions, broadening our understanding of the role of cooperative effects in the superradiant phase transition.