Title: Quantum oscillation study of the large magnetoresistance in Mo substituted WTe$_2$ single crystals Show Chinese title

Title: Mo掺杂WTe$_2$单晶中巨大磁阻的量子振荡研究

Abstract: The list of interesting electrical properties exhibited by transition metal dichalcogenides has grown with the discovery of extremely large magnetoresistance (MR) and type-II Weyl semimetal behaviour in WTe$_2$ and MoTe$_2$. The extremely large MR in WTe$_2$ is still not adequately understood. Here, we systematically study the effect of Mo substitution on the quantum oscillations in the MR in WTe$_2$. The MR decreases with Mo substitution, however, the carrier concentrations extracted from the quantum oscillations show that the charge compensation improves. We believe that earlier interpretations based on the two-band theory, which attribute the decrease in MR to charge imbalance, could be incorrect due to over-parametrization. We attribute the decrease in MR in the presence of charge compensation to a fall in transport mobility, which is evident from the residual resistivity ratio data. The quantum scattering time and the effective masses do not change within experimental errors upon substitution. Show Chinese abstract

Abstract: 过渡金属二硫属化物所表现出的有趣电学性质列表随着在WTe$_2$和 MoTe$_2$中发现极大的磁阻（MR）和 II 型 Weyl 半金属行为而不断增加。WTe$_2$中的极大磁阻现象仍未得到充分理解。在这里，我们系统地研究了钼取代对 WTe$_2$磁阻中量子振荡的影响。磁阻随着钼的取代而减小，然而，从量子振荡中提取的载流子浓度表明，电荷补偿有所改善。我们认为，基于双带理论的早期解释——将磁阻的降低归因于电荷不平衡——由于过度参数化可能是错误的。我们认为，在存在电荷补偿的情况下磁阻的下降应归因于输运迁移率的降低，这可以从残余电阻比数据中看出。量子散射时间和有效质量在实验误差范围内并未因取代而发生变化。