MoTe2巨磁电阻半金属态的霍尔效应
Hall-effect within the colossal magnetoresistive semi-metallic state of MoTe2
摘要：
在这里，我们报告了一个系统的研究的霍尔效应的半金属状态的块状MoTe $_2$，这是最近声称是一种新型的外尔半金属状态的候选人。温度（$T$）的载流子密度和它们的迁移率的依赖性，估计从各向同性的双载流子模型的基础上的数值分析，表明其极大的和非饱和的磁阻可能归因于在低温下的电子和空穴的密度之间的一个近乎完美的补偿。空穴密度的突然增加，伴随着电子迁移率在低于$T \sim 40$ K时的快速增加，导致在低温下电子和空穴的密度相当，这表明在该温度附近可能存在电子相变。
英文摘要：
Here, we report a systematic study on the Hall-effect of the semi-metallic state of bulk MoTe$_2$, which was recently claimed to be a candidate for a novel type of Weyl semi-metallic state. The temperature ($T$) dependence of the carrier densities and of their mobilities, as estimated from a numerical analysis based on the isotropic two-carrier model, indicates that its exceedingly large and non-saturating magnetoresistance may be attributed to a near perfect compensation between the densities of electrons and holes at low temperatures. A sudden increase in hole density, with a concomitant rapid increase in the electron mobility below $T \sim 40$ K, leads to comparable densities of electrons and holes at low temperatures suggesting a possible electronic phase-transition around this temperature.
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