光致η配对中的辐射Higgs模式
Radiative Higgs mode in photoinduced $η$ pairs
AI总结：
本研究证明Hubbard链中光致η配对态可被探测脉冲破坏对称性，引发动态Higgs振荡和负光导率，并导致Higgs频率光子发射，为识别该配对态提供独特标志。
摘要：
我们证明了在Hubbard链中，泵浦诱导的η配对态的η对称性可以被额外施加的探测脉冲瞬时破坏。这导致在探测脉冲期间η配对关联出现特征性的动态Higgs振荡，并在泵浦脉冲结束后很长时间，在平衡Mott间隙ω>Δ_c之上出现尖锐的动态负光导率σ(ω;t)。σ(ω;t)实部中的这个负峰是光致η配对态的独特标志，将其与以非相干双占位形成为主导的参数区域区分开来，后者不表现出这一特征。值得注意的是，宽带探测脉冲随后导致以Higgs频率发射光子。
英文摘要：
We demonstrate that the $η$ symmetry of the pump-induced $η$-pairing state in the Hubbard chain can be transiently broken by an additionally applied probe pulse. This leads to characteristic dynamic Higgs oscillations of the $η$-pair correlations during the probe pulse and a sharp dynamic negative optical conductivity $σ(ω;t)$, which appears above the equilibrium Mott gap $ω>Δ_{\rm c}$, long after the pump pulse is finished. This negative peak in the real part of $σ(ω;t)$ is a distinctive hallmark of the photoinduced $η$-pairing state, distinguishing it from parameter regimes dominated by incoherent doublon formation, which do not exhibit this feature. Remarkably, the broadband probe pulse then leads to the emission of photons with the Higgs frequency.
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