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arXiv 1602.01073cond-mat.mes-hallcond-mat.str-el
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单层和双层WSe $_2$中高迁移率空穴的Shubnikov-de Haas振荡:朗道能级简并、有效质量和负压缩性

Shubnikov-de Haas oscillations of high mobility holes in monolayer and bilayer WSe$_2$: Landau level degeneracy, effective mass, and negative compressibility

Babak Fallahazad, Hema C. P. Movva, Kyounghwan Kim, Stefano Larentis, Takashi Taniguchi, Kenji Watanabe, Sanjay K. Banerjee, Emanuel Tutuc

摘要:

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,它们在高磁场中表现出良好的Shubnikov-de Haas(SdH)振荡和量子霍尔态(QHS).在单层和双层WSe $_2$中,SdH振荡和QHS主要发生在均匀的填充因子下,表现出两倍的朗道能级简并。对双层WSe $_2$中的SdH振荡进行了傅里叶变换分析,发现存在两个位于顶层或底层的子带,以及负的可压缩性.从SdH振荡的温度依赖性,我们确定了$0.45m_{0}$的单和双层WSe $_2$的空穴有效质量。

英文摘要:

We study the magnetotransport properties of high mobility holes in monolayer and bilayer WSe$_2$, which display well defined Shubnikov-de Haas (SdH) oscillations, and quantum Hall states (QHSs) in high magnetic fields. In both mono and bilayer WSe$_2$, the SdH oscillations and the QHSs occur predominantly at even filling factors, evincing a two-fold Landau level degeneracy. The Fourier transform analysis of the SdH oscillations in bilayer WSe$_2$ reveal 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 WSe$_2$.

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