自发对称破缺与固态声子频率梳的集体Higgs-Goldstone动力学
Spontaneous Symmetry Breaking and Collective Higgs-Goldstone Dynamics in Solid-State Phononic Frequency Combs
AI总结：
本研究通过非线性Higgs-Goldstone相互作用在固态中可控生成声子频率梳，揭示了其形成条件及外部参数调控机制。
摘要：
我们研究了非线性耦合导致在六方InMnO3中产生声子频率梳的现象，这种现象源于Higgs-like和Goldstone-like声子模式之间的非线性耦合。Higgs-like模式是一种红外活跃的光学声子模式，通过短而高电场的太赫兹脉冲共振驱动，而光学不活跃的Goldstone-like模式则通过内在的非线性模式耦合间接激发。利用非线性声子学模型，我们数值求解了支配晶格动力学的耦合运动方程，并分析了由此产生的时域和频域响应。通过系统地改变关键驱动和材料参数，包括电场幅度、脉冲宽度、驱动频率和模式阻尼，我们确定了稳定声子频率梳出现的条件。我们的结果揭示了梳状结构形成明显的阈值行为，通过外部控制参数可以调节梳状间隔和频谱带宽，并在高驱动强度或弱阻尼时出现相干梳状结构的崩溃。这些发现展示了非线性Higgs-Goldstone相互作用如何实现可控的声子频率梳生成，并提供了对对称破缺材料中超快晶格动力学的见解。
英文摘要：
We investigate the generation of phononic frequency combs arising from nonlinear coupling between Higgs-like and Goldstone-like phonon modes in hexagonal InMnO3. The Higgs-like mode, an infrared-active optical phonon, is resonantly driven by a short, high-electric field terahertz pulse, while the optically inactive Goldstone-like mode is indirectly excited through intrinsic nonlinear mode coupling. Using a nonlinear phononics model, we numerically solve the coupled equations of motion governing the lattice dynamics and analyze the resulting time- and frequency-domain responses. By systematically varying key drive and material parameters-including electric field amplitude, pulse width, driving frequency, and mode damping-we identify the conditions under which stable phononic frequency combs emerge. Our results reveal clear threshold behaviors for comb formation, tunability of comb spacing and spectral bandwidth through external control parameters, and a breakdown of coherent comb structure at high drive strengths or weak damping. These findings demonstrate how nonlinear Higgs-Goldstone interactions enable controllable phononic frequency comb generation and provide insight into ultrafast lattice dynamics in symmetry-broken materials.
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