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arXiv 2106.05129cond-mat.mes-hall
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考虑焦耳自加热的二维材料纳米收缩的热方程

The heat equation for nanoconstrictions in 2D materials with Joule self-heating

Oliver M. G. Ward, Edward McCann

摘要:

我们考虑的热方程的单层二维材料中存在的热流进入基板和焦耳加热由于电流。我们比较的设备,包括纳米线的恒定宽度和领结(或楔形)收缩的宽度不同,我们推导出近似的一维热方程,领结收缩所描述的修改后的贝塞尔方程的零阶。我们比较了稳态近似方程的解析解与二维方程的有限元解的数值结果。使用这些解决方案,我们描述的热导率,热边界电阻与基板和设备的几何形状的作用。在固定电势差下的器件中的温度将随着宽度收缩而保持有限,但是对于固定电流将发散,与纳米线中的平方反比依赖性相比,蝴蝶结的宽度在几何上发散。

英文摘要:

We consider the heat equation for monolayer two-dimensional materials in the presence of heat flow into a substrate and Joule heating due to electrical current. We compare devices including a nanowire of constant width and a bow tie (or wedge) constriction of varying width, and we derive approximate one-dimensional heat equations for them; a bow tie constriction is described by the modified Bessel equation of zero order. We compare steady state analytic solutions of the approximate equations with numerical results obtained by a finite element method solution of the two-dimensional equation. Using these solutions, we describe the role of thermal conductivity, thermal boundary resistance with the substrate and device geometry. The temperature in a device at fixed potential difference will remain finite as the width shrinks, but will diverge for fixed current, logarithmically with width for the bow tie as compared to an inverse square dependence in a nanowire.

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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