原子级薄2D碲的异常低的热导率
Unusually low thermal conductivity of atomically thin 2D tellurium
摘要：
碲是一种高性能的热电材料，由于其优越的电子传输和低晶格热导率（$κ_L$）。在这里，我们报告了单层碲中的超低$κ_L$，即，在最近的实验中成功合成的碲。我们发现碲具有令人信服的低室温$κ_L$的2.16和4.08 W m $^{-1}$ K $^{-1}$沿扶手椅和Z字形方向，分别低于任何其他二维材料的报道值。我们将这种异常低的$κ_L$归因于软声学模式、极低能量的光学模式以及光声声子之间的强散射，这使得碲烯成为一种潜在的新型热电材料。最后，我们发现$κ_L$与二维材料中$Γ$点的最大声学声子频率（$ω_{D}^{a}$）和最低光学声子频率（$ω_Γ^{o}$）成正比，分别反映了材料的谐波和非谐波热性质.
英文摘要：
Tellurium is a high-performance thermoelectric material due to its superior electronic transport and low lattice thermal conductivity ($κ_L$). Here, we report the ultralow $κ_L$ in the monolayer tellurium, i.e., tellurene, which has been successfully synthesized in recent experiments. We find tellurene has a compellingly low room temperature $κ_L$ of 2.16 and 4.08 W m$^{-1}$ K$^{-1}$ along the armchair and zigzag directions, respectively, which is lower than any reported values for other 2D materials. We attribute this unusually low $κ_L$ to the soft acoustic modes, extremely low-energy optical modes and the strong scattering among optical-acoustic phonons, which place tellurene as a potential novel thermoelectric material. Finally, we disclose that $κ_L$ is proportional to the largest acoustic phonon frequency ($ω_{D}^{a}$) and the lowest optical phonon frequency at $Γ$ point ($ω_Γ^{o}$) in 2D materials, which reflect both harmonic and anharmonic thermal properties respectively.
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