论文标题
研究近场辐射传热的第一原理方法
First-principles method to study near-field radiative heat transfer
论文作者
论文摘要
我们提出了一种研究近场辐射传热的一般且方便的第一个原理方法。我们表明，热通量的陆台状表达可以用频率和波动依赖性的宏观介电函数表示，可以从线性响应密度函数理论中获得。随机相位近似用于计算响应函数。我们计算了三个系统中的传热 - 石墨烯，钼二硫化物（MOS $ _2 $）和硝化氢硼（H-BN）。我们的结果表明，近场热通量超过了黑体的限制，最高四个数量级。随着两个平行纸之间的距离增加，显示了$ 1/d^2 $的热通量依赖性，与库仑定律一致。传热能力对材料的介电特性敏感。还讨论了化学势和温度的影响。我们的方法可以应用于各种材料，包括具有不均匀性的系统。
We present a general and convenient first principle method to study near-field radiative heat transfer. We show that the Landauer-like expression of heat flux can be expressed in terms of a frequency and wave-vector dependent macroscopic dielectric function which can be obtained from the linear response density functional theory. A random phase approximation is used to calculate the response function. We computed the heat transfer in three systems -- graphene, molybdenum disulfide (MoS$_2$), and hexagonal boron nitride (h-BN). Our results show that the near-field heat flux exceeds the blackbody limit up to four orders of magnitude. With the increase of the distances between two parallel sheets, a $1/d^2$ dependence of heat flux is shown, consistent with Coulomb's law. The heat transfer capacity is sensitive to the dielectric properties of materials. Influences from chemical potential and temperature are also discussed. Our method can be applied to a wide range of materials including systems with inhomogeneities.
