Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP
Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP
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DOI：
10.1038/nphys3372
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发表时间：
2015-08-01
期刊：
影响因子：
19.6
通讯作者：
Yan, Binghai
中科院分区：
文献类型：
--
作者：
Shekhar, Chandra;Nayak, Ajaya K.;Yan, Binghai
最近的实验已经揭示了壮观的半金属输运性质，如大，非饱和磁阻WTe 2（参考文献1）。具有无质量相对论电子的拓扑半金属也被预测为石墨烯的三维类似物。这些系统被称为外尔半金属，并被预测具有一系列奇异的输运性质和表面态（4-7），与拓扑绝缘体（8，9）不同。在这里，我们研究了NbP的磁输运性质，该材料的能带结构已被预测为将Weyl半金属（10，11）的特征与正常半金属的特征结合联合收割机。我们观察到一个非常大的磁电阻850,000%，在1.85 K（250%，在室温下）在磁场高达9 T，没有任何饱和的迹象，和超高的载流子迁移率为5 × 10（6）cm（2）V-1 s（-1），伴随着强烈的Shubnikov-de哈斯（SdH）振荡。因此，NbP提出了一个独特的例子，结合拓扑和传统的电子相的材料，与有趣的物理性质，从他们的相互作用。
Recent experiments have revealed spectacular transport properties in semimetals, such as the large, non-saturating magnetoresistance exhibited by WTe2 (ref.1). Topological semimetals with massless relativistic electrons have also been predicted(2) as three-dimensional analogues of graphene(3). These systems are known as Weyl semimetals, and are predicted to have a range of exotic transport properties and surface states(4-7), distinct from those of topological insulators(8,9). Here we examine the magneto-transport properties of NbP, a material the band structure of which has been predicted to combine the hallmarks of a Weyl semimetal(10,11) with those of a normal semimetal. We observe an extremely large magnetoresistance of 850,000% at 1.85 K (250% at room temperature) in a magnetic field of up to 9 T, without any signs of saturation, and an ultra-high carrier mobility of 5 x 10(6) cm(2) V-1 s(-1) that accompanied by strong Shubnikov-de Haas (SdH) oscillations. NbP therefore presents a unique example of a material combining topological and conventional electronic phases, with intriguing physical properties resulting from their interplay.