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arXiv 2602.02476cond-mat.mes-hall
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石墨烯非线性参数振荡器的频率稳定性

Frequency Stability of Graphene Nonlinear Parametric Oscillator

Delft University of Technology(代尔夫特理工大学);Ben-Gurion University(本-古里安大学)

Enise Kartal, Oriel Shoshani, Elena Botnaru, Alberto Martín-Pérez, Tomás Manzaneque, Farbod Alijani

AI总结:

研究通过相位锁定环操作证明石墨烯参数振荡器在强非线性条件下能提升频率稳定性,其非线性阻尼机制有效抑制了幅度到频率噪声的转换。

摘要:

高频稳定性对于石墨烯谐振器在传感和时间保持应用中的性能至关重要。然而,石墨烯的极端微型化和高机械顺应性使其容易受到非线性效应的影响,从而降低频率稳定性。本文展示石墨烯参数振荡器提供了一种非线性工作模式,在强非线性条件下仍能增强短期频率稳定性。通过在相位锁定环中操作石墨烯谐振器,实验表明,在分岔后区域的参数振荡在快速积分时间下比相同振幅的杜芬振荡具有更低的阿伦偏差。这种改进源于参数振荡器固有的强非线性阻尼,它在大振幅下抑制了幅度到频率噪声的转换。一个最小理论模型捕捉到的相位扩散并识别出非线性阻尼是相位噪声减少的主导机制。这些结果突显了非线性耗散在使石墨烯振荡器超越传统极限的高精度传感中的作用。

英文摘要:

High-frequency stability is crucial for the performance of graphene resonators in sensing and timekeeping applications. However, the extreme miniaturization and high mechanical compliance that make graphene attractive also render it highly susceptible to nonlinearities, degrading frequency stability. Here, we demonstrate that graphene parametric oscillators provide an alternative nonlinear operating regime, where short-term frequency stability can be enhanced despite strong nonlinearity. By operating graphene resonators in a phase-locked loop (PLL), we experimentally demonstrate that parametric oscillations in the post-bifurcation regime achieve lower Allan deviation at fast integration times than Duffing oscillations at identical amplitudes. This improvement originates from strong nonlinear damping inherent to parametric oscillators, which suppresses amplitude-to-frequency noise conversion at large amplitudes. A minimal theoretical model captures observed phase diffusion and identifies nonlinear damping as the dominant mechanism governing phase noise reduction. These results highlight the role of nonlinear dissipation in enabling precision sensing beyond conventional limits of graphene oscillators.

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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