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arXiv 2401.01873quant-phcond-mat.mtrl-sciphysics.optics
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磁子 Dicke 超辐射相变的观测

Observation of the Magnonic Dicke Superradiant Phase Transition

Dasom Kim, Sohail Dasgupta, Xiaoxuan Ma, Joong-Mok Park, Hao-Tian Wei, Liang Luo, Jacques Doumani, Xinwei Li, Wanting Yang, Di Cheng, Richard H. J. Kim, Henry O… 展开作者

Dasom Kim, Sohail Dasgupta, Xiaoxuan Ma, Joong-Mok Park, Hao-Tian Wei, Liang Luo, Jacques Doumani, Xinwei Li, Wanting Yang, Di Cheng, Richard H. J. Kim, Henry O. Everitt, Shojiro Kimura, Hiroyuki Nojiri, Jigang Wang, Shixun Cao, Motoaki Bamba, Kaden R. A. Hazzard, Junichiro Kono

发表信息：
Science Advances 11, adt1691 (2025)
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AI总结：

本文报告了在 ErFeO$_3$ 中观测到磁子 Dicke 超辐射相变（SRPT）的光谱学证据，利用 Fe$^{3+}$ 磁子模式与 Er$^{3+}$ 自旋的交换耦合规避了不可行定理，实验揭示了临界点处杂化模式的扭折与软化特征。

摘要：

当耦合强度超过临界值时，与单模腔光子耦合的二能级原子被预测会发生量子相变，进入即使在零温度且无外部驱动下，原子极化和光子场仍为有限值的相。然而，由于哈密顿量中抗磁项的存在，这一被称为超辐射相变（SRPT）的现象被不可行定理所禁止。在此，我们展示了 ErFeO$_3$ 中磁子 SRPT 的光谱学证据，其中光子 SRPT 中的光子模式（二能级原子）的角色由 Fe$^{3+}$ 磁子模式（Er$^{3+}$ 自旋）扮演。Fe$^{3+}$-Er$^{3+}$ 交换耦合中抗磁项的缺失确保了不可行定理在此不适用。太赫兹和千兆赫兹磁光谱实验揭示了 SRPT 的特征——在临界点处，两个自旋-磁子杂化模式分别出现扭折和软化。

英文摘要：

Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic polarization and photonic field are finite even at zero temperature and without external driving. However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO$_3$, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe$^{3+}$ magnon mode (Er$^{3+}$ spins). The absence of the diamagnetic term in the Fe$^{3+}$-Er$^{3+}$ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT -- a kink and a softening, respectively, of two spin-magnon hybridized modes at the critical point.

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。

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