Enhanced Photoenergy Harvesting and Extreme Thomson Effect in Hydrodynamic Electronic Systems
Enhanced Photoenergy Harvesting and Extreme Thomson Effect in Hydrodynamic Electronic Systems
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DOI：
10.1103/physrevlett.122.166802
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发表时间：
2019-04-26
影响因子：
8.6
通讯作者：
Principi, Alessandro
中科院分区：
文献类型：
--
作者：
Andersen, Trond I.;Smith, Thomas B.;Principi, Alessandro
当电子-电子相互作用成为主要的散射机制时，材料的热电（TE）特性会发生显著变化。在简并流体动力学状态下，由于违反了Wiedemann-Franz定律，热导率降低并成为电子温度的递减函数。我们在这里展示了这种特殊的温度依赖性如何引起新的引人注目的TE现象。其中包括TE效率比Wiedemann-Franz方案提高80倍，稳态温度曲线发生显著的质的变化，以及极大的汤姆逊效应。在石墨烯中，我们在这里特别注意，由于热电势加倍，这些效应被进一步放大。
The thermoelectric (TE) properties of a material are dramatically altered when electron-electron interactions become the dominant scattering mechanism. In the degenerate hydrodynamic regime, the thermal conductivity is reduced and becomes a decreasing function of the electronic temperature, due to a violation of the Wiedemann-Franz law. We here show how this peculiar temperature dependence gives rise to new striking TE phenomena. These include an 80-fold increase in TE efficiency compared to the Wiedemann-Franz regime, dramatic qualitative changes in the steady state temperature profile, and an anomalously large Thomson effect. In graphene, which we pay special attention to here, these effects are further amplified due to a doubling of the thermopower.