Shubnikov-de Haas Oscillations of High-Mobility Holes in Monolayer and Bilayer WSe2: Landau Level Degeneracy, Effective Mass, and Negative Compressibility
Shubnikov-de Haas Oscillations of High-Mobility Holes in Monolayer and Bilayer WSe2: Landau Level Degeneracy, Effective Mass, and Negative Compressibility
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DOI：
10.1103/physrevlett.116.086601
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发表时间：
2016-02-23
影响因子：
8.6
通讯作者：
Tutuc, Emanuel
中科院分区：
文献类型：
--
作者：
Fallahazad, Babak;Movva, Hema C. P.;Tutuc, Emanuel
我们研究了单层和双层WSe 2中高迁移率空穴的磁输运性质，它们在强磁场下表现出良好的Shubnikov-de哈斯（SdH）振荡和量子霍尔态.在单层和双层WSe 2中，SdH振荡和量子霍尔态主要发生在均匀的填充因子下，表现出双重的朗道能级简并。傅里叶变换分析的SdH振荡双层WSe 2揭示了存在两个子带本地化的顶部或底部层，以及负压缩性。从SdH振荡的温度依赖性，我们确定的空穴的有效质量为0.45米（0）的单层和双层WSe 2。
We study the magnetotransport properties of high-mobility holes in monolayer and bilayer WSe2, which display well defined Shubnikov-de Haas (SdH) oscillations, and quantum Hall states in high magnetic fields. In both mono-and bilayer WSe2, the SdH oscillations and the quantum Hall states occur predominantly at even filling factors, evincing a twofold Landau level degeneracy. The Fourier transform analysis of the SdH oscillations in bilayer WSe2 reveals the presence of two subbands localized in the top or the bottom layer, as well as negative compressibility. From the temperature dependence of the SdH oscillations we determine a hole effective mass of 0.45m(0) for both mono-and bilayer WSe2.