论文标题
电驱动的晶格导热率的强大调整
Electrically driven robust tuning of lattice thermal conductivity
论文作者
论文摘要
石墨烯代表的二维（2D）材料在未来的电气行业中脱颖而出，并经过了广泛的研究。作为电子设备中通常存在的因素，电场已广泛用于调节性能。但是，很少研究电场如何调节热传输。在此，我们通过将范围从0到0.4 Va-1施加外部电场来研究热传输性能的调节，将双层石墨烯，单层硅和德国烯作为研究案例。揭示了所有三种材料的热导率的单调降低趋势。发现对散射速率的显着影响是导致电场降低导热率的原因。进一步的证据表明，内部电场的重建和诱导电荷的产生导致强烈声子非谐调的散射率提高。因此，使用外部电场施加了超低热电导率。应用外部电场调节导热率，启发了高效热管理的建设性思想。
Two-dimensional (2D) materials represented by graphene stand out in future electrical industry and have been widely studied. As a commonly existing factor in electronic devices, the electric field has been extensively utilized to modulate the performance. However, how the electric field regulates thermal transport is rarely studied. Herein, we investigate the modulation of thermal transport properties by applying the external electric field ranging from 0 to 0.4 VA-1, with bilayer graphene, monolayer silicene, and germanene as study cases. The monotonic decreasing trend of thermal conductivity of all the three materials is revealed. The significant effect on the scattering rate is found to be responsible for the decreased thermal conductivity by electric field. Further evidences show that the reconstruction of internal electric field and the generation of induced charges lead to the increased scattering rate from strong phonon anharmonicity. Thus, the ultra-low thermal conductivity emerges with external electric field applied. Applying external electric field to regulate thermal conductivity enlightens the constructive idea for high-efficient thermal management.
