论文标题
由于磁场诱导的扁平带引起的非线性传输
Nonlinear transport due to magnetic-field-induced flat bands in the nodal-line semimetal ZrTe5
论文作者
论文摘要
最近发现，在非常低的载流子密度下的Dirac Material Zrte $ _5 $是节点线的半学，其中预计在与节点线平面平行的磁场中，超固定频带有望在磁场中出现。在这里，我们报告说，在非常低的Zrte $ _5 $的载体密度样品中，当电流和磁场均沿着晶体学$ A $轴时，电流 - 电压特性提出了明显的非线性，往往在超量子限制中饱和。非线性系数的磁场依赖性通过Boltzmann理论用于平移运输，我们认为这种非线性运输可能是由于平坦带和电荷水坑的综合作用，后者出现的是由于非常低的载体密度。
The Dirac material ZrTe$_5$ at very low carrier density was recently found to be a nodal-line semimetal, where ultra-flat bands are expected to emerge in magnetic fields parallel to the nodal-line plane. Here we report that in very low carrier-density samples of ZrTe$_5$, when the current and the magnetic field are both along the crystallographic $a$ axis, the current-voltage characteristics presents a pronounced nonlinearity which tends to saturate in the ultra quantum limit. The magnetic-field dependence of the nonlinear coefficient is well explained by the Boltzmann theory for flat-band transport, and we argue that this nonlinear transport is likely due to the combined effect of flat bands and charge puddles, the latter appear due to very low carrier densities.
