Abstract
We study the magnetotransport properties of high-mobility holes in monolayer and bilayer , which display well defined Shubnikov–de Haas (SdH) oscillations, and quantum Hall states in high magnetic fields. In both mono- and bilayer , 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 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 for both mono- and bilayer .
- Received 23 November 2015
DOI:https://doi.org/10.1103/PhysRevLett.116.086601
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