二维硒化锡中声子驱动的电子散射和磁热电效应
Phonon-Driven Electron Scattering and Magnetothermoelectric Effect in Two-Dimensional Tin Selenide
摘要：
体相硒化锡（SnSe）由于具有很强的声子-声子相互作用，是目前性能最好的热电材料。研究了电子-声子耦合对二维SnSe薄膜输运性质的影响。我们证明，EPC中起着关键作用的散射率的恒定弛豫时间近似是不足的。与原始石墨烯相比，EPC强度特别大。当费米能级接近带边时，散射率敏感地依赖于系统温度和载流子密度。我们还研究了二维SnSe的磁热电效应。结果表明，在低温下，样品具有很大的磁电阻率和磁热电阻率，其电阻率可达50 0%以上，具有很大的应用潜力。我们的结果与实验数据相当吻合。
英文摘要：
The bulk tin selenide (SnSe) is the best thermoelectric material currently with the highest figure-of-merit due to the strong phonon-phonon interactions. We investigate the effect of electron-phonon coupling (EPC) on the transport properties of two-dimensional (2D) SnSe sheet. We demonstrate that EPC plays a key role in the scattering rate where the constant relaxation time approximation is deficient. The EPC strength is especially large in contrast to that of pristine graphene. The scattering rate depends sensitively on the system temperatures and the carrier densities when the Fermi energy approaches the band edge. We also investigate the magnetothermoelectric effect of the 2D SnSe. It is found that at low temperatures there are enormous magnetoelectrical resistivity and magnetothermal resistivity above 500\%, suggesting the high potential for device applications. Our results agree reasonably well with the experimental data.
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