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arXiv 1504.01460cond-mat.mtrl-scicond-mat.str-el
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WTe2中Shubnikov-de Haas振荡揭示的多费米口袋

Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2

Fei-Xiang Xiang, Menno Veldhorst, Shi-Xue Dou, Xiao-Lin Wang

摘要:

我们使用磁输运测量来研究WTe 2单晶的电子结构。在2.5 ~ 200 K温度范围内,磁场高达8 T时,观察到非饱和的抛物线型磁电阻。观察到了具有拍频模式的Shubnikov-de Haas振荡。SdH振荡的快速傅立叶变换揭示了三个振荡频率,对应于三对费米口袋具有可比的有效质量,m* ~ 0.31 me. By拟合的霍尔电阻率,我们推断存在一对电子口袋和两对空穴口袋,以及几乎完美的补偿的电子空穴载流子浓度。这些磁输运测量揭示了复杂的电子结构在WTe 2,解释了非饱和磁阻。

英文摘要:

We use magneto-transport measurements to investigate the electronic structure of WTe2 single crystals. A non-saturating and parabolic magnetoresistance is observed in the temperature range between 2.5 to 200 K and magnetic fields up to 8 T. Shubnikov - de Haas oscillations with beating patterns are observed. The fast Fourier transform of the SdH oscillations reveals three oscillation frequencies, corresponding to three pairs of Fermi pockets with comparable effective masses , m* ~ 0.31 me. By fitting the Hall resistivity, we infer the presence of one pair of electron pockets and two pairs of hole pockets, together with nearly perfect compensation of the electron-hole carrier concentration. These magnetotransport measurements reveal the complex electronic structure in WTe2, explaining the nonsaturating magnetoresistance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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