论文标题
石墨烯中的Wiedemann-Franz法律
Wiedemann-Franz law in graphene
论文作者
论文摘要
我们分析了一项著名的实验工作[J. Crossno等人，Science 351，1058（2016）]，报道了Wiedemann-Franz法律在$ t \ sim 10 $ 10 $ - $ 100 \，\ Mathrm {k} $中的失败，将这种失败归因于与不含量辅助石墨固醇相关的非 - 弗米液体性质的失败。尽管有严格的理论努力，但报告的观察结果仍无法解释。我们基于费米液体考虑的详细定量分析，适用于外部掺杂石墨烯，确定对报告的观测值的一种可能的解释是在Dirac Point上的间隙开放，这可能是由氮化氢盐底物引起的。我们建议解决问题需要更多的实验，我们认为实验实际上可能与狄拉克流体流体动力学没有任何关系，但与有限的 - 温度低密度的低密度双极扩散在存在短距离和长期疾病的情况下以及孔子以及声子。
We analyze a well-known experimental work [J. Crossno et al., Science 351, 1058 (2016)] which reported on the failure of the Wiedemann-Franz law in graphene at $T\sim 10$-$100\,\mathrm{K}$, attributing this failure to the non-Fermi liquid nature of the Dirac fluid associated with undoped intrinsic graphene. In spite of serious theoretical efforts, the reported observations remain unexplained. Our detailed quantitative analysis based on Fermi liquid considerations, which apply to extrinsic doped graphene, establishes that one possible explanation for the reported observations is the opening of a gap at the Dirac point, induced perhaps by the boron nitride substrate. We suggest that more experiments are necessary to resolve the issue, and we believe that the experiment may not actually have anything to do with Dirac fluid hydrodynamics, but relates to finite-temperature low-density bipolar diffusive transport by electrons and holes in the presence of short- and long-range disorder, and phonons.
