玻璃态流体中的无热活化
Athermal Activation in Glassy Fluid
摘要：
在这篇文章中，我们提出了SiOx纳米线在适度辐照下具有高流动性的机制，高流动性的原因是由于小极化子的形成导致了辐照诱导空穴的长寿命。辐照产生的空穴寿命长，并在空间中局域化，这种成键电子的缺失抑制了网络Pachner移动的能垒（非热激活效应）。通过声子与局域组态的相互作用建立了系统的原子级动力学模型，并利用相应的随机动力学方程的通过率研究了系统的激活效应，计算表明Pachner移动时间与激活寿命呈指数关系，局部配置时间和流体粘度之间的联系表明粘度对无热激活的寿命的强敏感性，这种机理将对不期望的高流动性以及导体对材料的钝化作用给出有效的解释。
英文摘要：
In this article, the mechanism of the unexpected high fluidity in SiOx nanowire under modest irradiation was proposed, the high fluidity is attributed to the long lifetime of irradiation-induced holes, which arise from formation of small polarons. The holes created in irradiation could have a long lifetime, and localized in space, such missing of bonding electron could suppress the energy barrier(athermal activation effect) for a Pachner move of the network. The atomic level dynamics of the system is proposed by interaction of phonon and local configuration, the activation effect was then studied with passing rate of corresponding stochastic dynamic equation, calculation shows an exponential dependent of the time-lapse of Pachner move to lifetime of the activation, furthermore, connection between the local configuration time and viscosity of the fluid indicates a strong sensitivity of viscosity to lifetime of the athermal activation, such mechanism would give an effective interpretation to the unexpected high fluidity together with the passivation effect of the conductor on the material.
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