Significance Controlling collective phenomena in quantum materials is a promising route toward engineering material properties on demand. Strong THz lasers have been successful at inducing ferroelectricity in S r T i O 3 . Here we demonstrate, from atomistic calculations, that cavity quantum vacuum fluctuations induce a change in the collective phase of S r T i O 3 in the strong light–matter coupling regime. Under these conditions, the ferroelectric phase is stabilized as the ground state, instead of the quantum paraelectric one. We conceptualize this light–matter hybrid state as a material photo ground state: Fundamental properties such as crystal structure, phonon frequencies, and the collective phase of a material are determined by the quantum light–matter coupling in equilibrium conditions. Cavity-coupling adds a new dimension to the phase diagram of S r T i O 3 .

中文翻译：

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SrTiO 3 的铁电光基态：腔体材料工程

意义控制量子材料中的集体现象是按需工程材料性能的一条有前途的途径。强太赫兹激光器已成功诱导铁电体 S r 时间 我 氧 3 。在这里，我们通过原子计算证明，空腔量子真空涨落会引起集体相的变化 S r 时间 我 氧 3 在强光-物质耦合状态下。在这些条件下，铁电相稳定为基态，而不是量子顺电相。我们将这种光-物质混合态概念化为材料光基态：材料的晶体结构、声子频率和集体相等基本特性是由平衡条件下的量子光-物质耦合决定的。空腔耦合为相图添加了新的维度 S r 时间 我 氧 3 。